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Sánchez-Rangel D, Hernández-Domínguez EE, Pérez-Torres CA, Ortiz-Castro R, Villafán E, Rodríguez-Haas B, Alonso-Sánchez A, López-Buenfil A, Carrillo-Ortiz N, Hernández-Ramos L, Ibarra-Laclette E. Environmental pH modulates transcriptomic responses in the fungus Fusarium sp. associated with KSHB Euwallacea sp. near fornicatus. BMC Genomics 2018; 19:721. [PMID: 30285612 PMCID: PMC6167834 DOI: 10.1186/s12864-018-5083-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2018] [Accepted: 09/17/2018] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND The Ambrosia Fusarium Clade phytopathogenic Fusarium fungi species have a symbiotic relationship with ambrosia beetles in the genus Euwallacea (Coleoptera: Curculionidae). Related beetle species referred to as Euwallacea sp. near fornicatus have been spread in California, USA and are recognized as the causal agents of Fusarium dieback, a disease that causes mortality of many plant species. Despite the importance of this fungi, no transcriptomic resources have been generated. The datasets described here represent the first ever transcripts available for these species. We focused our study on the isolated species of Fusarium that is associated with one of the cryptic species referred to as Kuroshio Shot Hole Borer (KSHB) Euwallacea sp. near fornicatus. RESULTS Hydrogen concentration is a critical signal in fungi for growth and host colonization, the aim of this study was to evaluate the effect of different pH conditions on growth and gene expression of the fungus Fusarium sp. associated with KSHB. An RNA-seq approach was used to compare the gene expression of the fungus grown for 2 weeks in liquid medium at three different pH levels (5.0, 6.0, and 7.0). An unbuffered treatment was included to evaluate the capability of the fungus to change the pH of its environment and the impact in gene expression. The results showed that the fungus can grow and modulate its genetic expression at different pH conditions; however, growth was stunted in acidic pH in comparison with neutral pH. The results showed a differential expression pattern in each pH condition even when acidic conditions prevailed at the end of the experiment. After comparing transcriptomics data from the three treatments, we found a total of 4,943 unique transcripts that were differentially expressed. CONCLUSIONS We identified transcripts related to pH signaling such as the conserved PAL/RIM pathway, some transcripts related to secondary metabolism and other transcripts that were differentially expressed. Our analysis suggests possible mechanisms involved in pathogenicity in this novel Fusarium species. This is the first report that shows transcriptomic data of this pathogen as well as the first report of genes and proteins involved in their metabolism identifying potential virulence factors.
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Affiliation(s)
- Diana Sánchez-Rangel
- Red de Estudios Moleculares Avanzados, Instituto de Ecología A.C, 91070 Xalapa, Veracruz Mexico
- Cátedra CONACYT en el Instituto de Ecología A.C, Xalapa, Veracruz Mexico
| | - Eric-Edmundo Hernández-Domínguez
- Red de Estudios Moleculares Avanzados, Instituto de Ecología A.C, 91070 Xalapa, Veracruz Mexico
- Cátedra CONACYT en el Instituto de Ecología A.C, Xalapa, Veracruz Mexico
| | - Claudia-Anahí Pérez-Torres
- Red de Estudios Moleculares Avanzados, Instituto de Ecología A.C, 91070 Xalapa, Veracruz Mexico
- Cátedra CONACYT en el Instituto de Ecología A.C, Xalapa, Veracruz Mexico
| | - Randy Ortiz-Castro
- Red de Estudios Moleculares Avanzados, Instituto de Ecología A.C, 91070 Xalapa, Veracruz Mexico
- Cátedra CONACYT en el Instituto de Ecología A.C, Xalapa, Veracruz Mexico
| | - Emanuel Villafán
- Red de Estudios Moleculares Avanzados, Instituto de Ecología A.C, 91070 Xalapa, Veracruz Mexico
| | - Benjamín Rodríguez-Haas
- Red de Estudios Moleculares Avanzados, Instituto de Ecología A.C, 91070 Xalapa, Veracruz Mexico
| | | | - Abel López-Buenfil
- Servicio Nacional de Sanidad, Inocuidad y Calidad Agroalimentaria, Unidad Integral de Diagnóstico, Servicios y Constatación, 55740 Tecámac, Estado de México Mexico
| | - Nayeli Carrillo-Ortiz
- Servicio Nacional de Sanidad, Inocuidad y Calidad Agroalimentaria, Unidad Integral de Diagnóstico, Servicios y Constatación, 55740 Tecámac, Estado de México Mexico
| | - Lervin Hernández-Ramos
- Servicio Nacional de Sanidad, Inocuidad y Calidad Agroalimentaria, Unidad Integral de Diagnóstico, Servicios y Constatación, 55740 Tecámac, Estado de México Mexico
| | - Enrique Ibarra-Laclette
- Red de Estudios Moleculares Avanzados, Instituto de Ecología A.C, 91070 Xalapa, Veracruz Mexico
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202
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Cruz Jimenez DR, Ellis ML, Munkvold GP, Leandro LFS. Isolate-Cultivar Interactions, In Vitro Growth, and Fungicide Sensitivity of Fusarium oxysporum Isolates Causing Seedling Disease on Soybean. Plant Dis 2018; 102:1928-1937. [PMID: 30070962 DOI: 10.1094/pdis-03-17-0380-re] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Fusarium oxysporum is frequently associated with soybean root rot in the United States. Information about pathogenicity and other phenotypic characteristics of F. oxysporum populations is limited. The objective of the research described herein was to assess phenotypic characteristics of F. oxysporum isolates from soybean, including the interaction between isolates and soybean cultivars, fungal growth characteristics in culture, and sensitivity to fungicides commonly used as seed treatment products. The pathogenicity of 14 isolates was evaluated in rolled-towel and Petri-dish assays using 11 soybean cultivars. In the rolled-towel assay, seed were inoculated with a conidial suspension and disease severity was observed. In the Petri-dish assay, F. oxysporum isolates were grown on 2% water agar and seed were placed on the F. oxysporum colony to observe the symptoms that developed. Cultivars differed in susceptibility to F. oxysporum, and significant (P = 0.0140) isolate-cultivar interactions were observed. F. oxysporum isolates differed in radial growth on potato dextrose agar at 25°C. Pyraclostrobin and trifloxystrobin reduced conidial germination with average 50% effective concentration (EC50) of 0.15 and 0.20 µg active ingredient (a.i.)/ml, respectively. Ipconazole reduced fungal growth with average EC50 of 0.23 µg a.i./ml, whereas fludioxonil was ineffective. Our results illustrate soybean F. oxysporum isolate variability and the potential for their management through cultivar selection or seed treatment.
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Affiliation(s)
- D R Cruz Jimenez
- Department of Plant Pathology and Microbiology, Iowa State University, Ames 50011
| | - M L Ellis
- Department of Plant Pathology and Microbiology, Iowa State University, Ames 50011
| | - G P Munkvold
- Department of Plant Pathology and Microbiology, Iowa State University, Ames 50011
| | - L F S Leandro
- Department of Plant Pathology and Microbiology, Iowa State University, Ames 50011
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203
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Erginbas-Orakci G, Sehgal D, Sohail Q, Ogbonnaya F, Dreisigacker S, Pariyar SR, Dababat AA. Identification of Novel Quantitative Trait Loci Linked to Crown Rot Resistance in Spring Wheat. Int J Mol Sci 2018; 19:E2666. [PMID: 30205560 PMCID: PMC6165080 DOI: 10.3390/ijms19092666] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2018] [Revised: 08/17/2018] [Accepted: 08/25/2018] [Indexed: 01/04/2023] Open
Abstract
Crown rot (CR), caused by various Fusarium species, is a major disease in many cereal-growing regions worldwide. Fusarium culmorum is one of the most important species, which can cause significant yield losses in wheat. A set of 126 advanced International Maize and Wheat Improvement Center (CIMMYT) spring bread wheat lines were phenotyped against CR for field crown, greenhouse crown and stem, and growth room crown resistance scores. Of these, 107 lines were genotyped using Diversity Array Technology (DArT) markers to identify quantitative trait loci linked to CR resistance by genome-wide association study. Results of the population structure analysis grouped the accessions into three sub-groups. Genome wide linkage disequilibrium was large and declined on average within 20 cM (centi-Morgan) in the panel. General linear model (GLM), mixed linear model (MLM), and naïve models were tested for each CR score and the best model was selected based on quarantine-quarantine plots. Three marker-trait associations (MTAs) were identified linked to CR resistance; two of these on chromosome 3B were associated with field crown scores, each explaining 11.4% of the phenotypic variation and the third MTA on chromosome 2D was associated with greenhouse stem score and explained 11.6% of the phenotypic variation. Together, these newly identified loci provide opportunity for wheat breeders to exploit in enhancing CR resistance via marker-assisted selection or deployment in genomic selection in wheat breeding programs.
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Affiliation(s)
- Gul Erginbas-Orakci
- Global Wheat Program, International Maize and Wheat Improvement Center (CIMMYT), Ankara 06511, Turkey.
| | - Deepmala Sehgal
- International Maize and Wheat Improvement Center (CIMMYT), Apdo. Postal 6-641, Mexico DF06600, Mexico.
| | - Quahir Sohail
- International Winter Wheat Improvement Program (IWWIP), International Maize and Wheat Improvement Center (CIMMYT), Ankara 06511, Turkey.
- Institute of Biotechnology and Genetic Engineering, The University of Agriculture Peshawar, Peshawar 25000, Pakistan.
| | - Francis Ogbonnaya
- Grains Research and Development Corporation (GRDC), P.O. Box 5367, Kingston, ACT 2604, Australia.
| | - Susanne Dreisigacker
- International Maize and Wheat Improvement Center (CIMMYT), Apdo. Postal 6-641, Mexico DF06600, Mexico.
| | - Shree R Pariyar
- Institute of Bio- and Geosciences, Plant Sciences (IBG-2), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany.
| | - Abdelfattah A Dababat
- Global Wheat Program, International Maize and Wheat Improvement Center (CIMMYT), Ankara 06511, Turkey.
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204
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Voss-Fels KP, Qian L, Gabur I, Obermeier C, Hickey LT, Werner CR, Kontowski S, Frisch M, Friedt W, Snowdon RJ, Gottwald S. Genetic insights into underground responses to Fusarium graminearum infection in wheat. Sci Rep 2018; 8:13153. [PMID: 30177750 PMCID: PMC6120866 DOI: 10.1038/s41598-018-31544-w] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2018] [Accepted: 08/19/2018] [Indexed: 11/16/2022] Open
Abstract
The ongoing global intensification of wheat production will likely be accompanied by a rising pressure of Fusarium diseases. While utmost attention was given to Fusarium head blight (FHB) belowground plant infections of the pathogen have largely been ignored. The current knowledge about the impact of soil borne Fusarium infection on plant performance and the underlying genetic mechanisms for resistance remain very limited. Here, we present the first large-scale investigation of Fusarium root rot (FRR) resistance using a diverse panel of 215 international wheat lines. We obtained data for a total of 21 resistance-related traits, including large-scale Real-time PCR experiments to quantify fungal spread. Association mapping and subsequent haplotype analyses discovered a number of highly conserved genomic regions associated with resistance, and revealed a significant effect of allele stacking on the stembase discoloration. Resistance alleles were accumulated in European winter wheat germplasm, implying indirect prior selection for improved FRR resistance in elite breeding programs. Our results give first insights into the genetic basis of FRR resistance in wheat and demonstrate how molecular parameters can successfully be explored in genomic prediction. Ongoing work will help to further improve our understanding of the complex interactions of genetic factors influencing FRR resistance.
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Affiliation(s)
- Kai P Voss-Fels
- Department of Plant Breeding, IFZ Research Centre for Biosystems, Land Use and Nutrition, Justus Liebig University, Heinrich-Buff-Ring 26-32, 35392, Giessen, Germany.
- Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, St Lucia, QLD, 4072, Australia.
| | - Lunwen Qian
- Department of Plant Breeding, IFZ Research Centre for Biosystems, Land Use and Nutrition, Justus Liebig University, Heinrich-Buff-Ring 26-32, 35392, Giessen, Germany
- Collaborative Innovation Center of Grain and Oil Crops in South China, Hunan Agricultural University, Changsha, 410128, P.R. China
| | - Iulian Gabur
- Department of Plant Breeding, IFZ Research Centre for Biosystems, Land Use and Nutrition, Justus Liebig University, Heinrich-Buff-Ring 26-32, 35392, Giessen, Germany
| | - Christian Obermeier
- Department of Plant Breeding, IFZ Research Centre for Biosystems, Land Use and Nutrition, Justus Liebig University, Heinrich-Buff-Ring 26-32, 35392, Giessen, Germany
| | - Lee T Hickey
- Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, St Lucia, QLD, 4072, Australia
| | - Christian R Werner
- Department of Plant Breeding, IFZ Research Centre for Biosystems, Land Use and Nutrition, Justus Liebig University, Heinrich-Buff-Ring 26-32, 35392, Giessen, Germany
| | - Stefan Kontowski
- W. von Borries-Eckendorf GmbH & Co. KG, Hovedisser Str. 92, 33818, Leopoldshöhe, Germany
| | - Matthias Frisch
- Institute for Agronomy and Plant Breeding II, IFZ Research Centre for Biosystems, Land Use and Nutrition, Justus Liebig University, Heinrich-Buff-Ring 26-32, 35392, Giessen, Germany
| | - Wolfgang Friedt
- Department of Plant Breeding, IFZ Research Centre for Biosystems, Land Use and Nutrition, Justus Liebig University, Heinrich-Buff-Ring 26-32, 35392, Giessen, Germany
| | - Rod J Snowdon
- Department of Plant Breeding, IFZ Research Centre for Biosystems, Land Use and Nutrition, Justus Liebig University, Heinrich-Buff-Ring 26-32, 35392, Giessen, Germany
| | - Sven Gottwald
- Department of Plant Breeding, IFZ Research Centre for Biosystems, Land Use and Nutrition, Justus Liebig University, Heinrich-Buff-Ring 26-32, 35392, Giessen, Germany
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205
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Belan LL, Belan LL, Rafael AM, Lorenzoni RM, Souza-Sobreira FB, Soares TCB, de Oliveira FL, Moraes WB. First Report of Fusarium Species Associated with Fusarium Wilt in Coffea canephora Plants in Brazil. Plant Dis 2018; 102:1859. [PMID: 30125178 DOI: 10.1094/pdis-01-18-0186-pdn] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Affiliation(s)
- L L Belan
- Department of Agronomy, CCAE-UFES, 29500-000 Alegre-ES, Brazil
| | - L L Belan
- Department of Agronomy, CCAE-UFES, 29500-000 Alegre-ES, Brazil
| | - A M Rafael
- Department of Agronomy, CCAE-UFES, 29500-000 Alegre-ES, Brazil
| | - R M Lorenzoni
- Graduate Program in Vegetal Production, CCAE-UFES, 29500-000 Alegre-ES, Brazil
| | - F B Souza-Sobreira
- Graduate Program in Vegetal Production, CCAE-UFES, 29500-000 Alegre-ES, Brazil
| | - T C B Soares
- Department of Pharmacy and Nutrition, UFES, 29500-000 Alegre-ES, Brazil
| | - F L de Oliveira
- Department of Agronomy, CCAE-UFES, 29500-000 Alegre-ES, Brazil
| | - W B Moraes
- Department of Agronomy, CCAE-UFES, 29500-000 Alegre-ES, Brazil
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206
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Qiu JB, Yu MZ, Yin Q, Xu JH, Shi JR. Molecular Characterization, Fitness, and Mycotoxin Production of Fusarium asiaticum Strains Resistant to Fludioxonil. Plant Dis 2018; 102:1759-1765. [PMID: 30125190 DOI: 10.1094/pdis-11-17-1772-re] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Fludioxonil is used in seedborne disease management of various fungal pathogens, including Fusarium asiaticum, the predominant causal agent of Fusarium head blight in China. In this study, we screened resistant strains from a large number of F. asiaticum strains collected from 2012 to 2016 and found that 4 of 1,000 field strains were highly resistant to fludioxonil. The 50% effective concentration values of the resistant strains and induced mutants ranged from 80 to >400 μg/ml. Compared with field-sensitive strains, all field-collected and laboratory-induced resistant strains exhibited fitness defects in traits including mycelial growth, conidial production, pathogenicity, and sensitivity to osmotic conditions. In the presence of fludioxonil, significantly higher glycerol accumulation was found in sensitive strains but not in resistant individuals. The fludioxonil-resistant strains produced lower amounts of glycerol in liquid culture and lower amounts of trichothecene mycotoxins in rice culture and inoculated wheat spikelets than the fludioxonil-sensitive strains. Sequence analyses of the key genes of the two-component histidine kinase signaling pathway showed various amino acid substitutions in the Os1, Os4, and Os5 genes between field-sensitive and resistant strains or mutants. The results of this study suggest a potential risk of fludioxonil resistance development and a possible influence of resistance mutations on fitness parameters and toxin production in F. asiaticum.
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Affiliation(s)
- J B Qiu
- Institute of Food Safety and Nutrition, Jiangsu Academy of Agricultural Sciences; Key Lab of Food Quality and Safety of Jiangsu Province-State Key Laboratory Breeding Base; Key Laboratory of Control Technology and Standard for Agro-Product Quality and Safety, Ministry of Agriculture; Key Laboratory of Agro-Product Safety Risk Evaluation, Ministry of Agriculture; Collaborative Innovation Center for Modern Grain Circulation and Safety, Nanjing, 210014, China
| | - M Z Yu
- Institute of Food Safety and Nutrition, Jiangsu Academy of Agricultural Sciences; Key Lab of Food Quality and Safety of Jiangsu Province-State Key Laboratory Breeding Base; Key Laboratory of Control Technology and Standard for Agro-Product Quality and Safety, Ministry of Agriculture; Key Laboratory of Agro-Product Safety Risk Evaluation, Ministry of Agriculture; Collaborative Innovation Center for Modern Grain Circulation and Safety, Nanjing, 210014, China
| | - Q Yin
- Institute of Botany, Jiangsu Province and Chinese Academy of Sciences, Nanjing Botanical Garden Mem, Sun Yat-sen, Nanjing, 210014, China
| | - J H Xu
- Institute of Food Safety and Nutrition, Jiangsu Academy of Agricultural Sciences; Key Lab of Food Quality and Safety of Jiangsu Province-State Key Laboratory Breeding Base; Key Laboratory of Control Technology and Standard for Agro-Product Quality and Safety, Ministry of Agriculture; Key Laboratory of Agro-Product Safety Risk Evaluation, Ministry of Agriculture; Collaborative Innovation Center for Modern Grain Circulation and Safety, Nanjing, 210014, China
| | - J R Shi
- Institute of Food Safety and Nutrition, Jiangsu Academy of Agricultural Sciences; Key Lab of Food Quality and Safety of Jiangsu Province-State Key Laboratory Breeding Base; Key Laboratory of Control Technology and Standard for Agro-Product Quality and Safety, Ministry of Agriculture; Key Laboratory of Agro-Product Safety Risk Evaluation, Ministry of Agriculture; Collaborative Innovation Center for Modern Grain Circulation and Safety, Nanjing, 210014, China
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207
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Pan Y, Liu Z, Rocheleau H, Fauteux F, Wang Y, McCartney C, Ouellet T. Transcriptome dynamics associated with resistance and susceptibility against fusarium head blight in four wheat genotypes. BMC Genomics 2018. [PMID: 30157778 DOI: 10.1186/s12864-018-5012-5013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/01/2023] Open
Abstract
BACKGROUND Fusarium head blight (FHB) of wheat in North America is caused mostly by the fungal pathogen Fusarium graminearum (Fg). Upon exposure to Fg, wheat initiates a series of cellular responses involving massive transcriptional reprogramming. In this study, we analyzed transcriptomics data of four wheat genotypes (Nyubai, Wuhan 1, HC374, and Shaw), at 2 and 4 days post inoculation (dpi) with Fg, using RNA-seq technology. RESULTS A total of 37,772 differentially expressed genes (DEGs) were identified, 28,961 from wheat and 8811 from the pathogen. The susceptible genotype Shaw exhibited the highest number of host and pathogen DEGs, including 2270 DEGs associating with FHB susceptibility. Protein serine/threonine kinases and LRR-RK were associated with susceptibility at 2 dpi, while several ethylene-responsive, WRKY, Myb, bZIP and NAC-domain containing transcription factors were associated with susceptibility at 4 dpi. In the three resistant genotypes, 220 DEGs were associated with resistance. Glutathione S-transferase (GST), membrane proteins and distinct LRR-RKs were associated with FHB resistance across the three genotypes. Genes with unique, high up-regulation by Fg in Wuhan 1 were mostly transiently expressed at 2 dpi, while many defense-associated genes were up-regulated at both 2 and 4 dpi in Nyubai; the majority of unique genes up-regulated in HC374 were detected at 4 dpi only. In the pathogen, most genes showed increased expression between 2 and 4 dpi in all genotypes, with stronger levels in the susceptible host; however two pectate lyases and a hydrolase were expressed higher at 2 dpi, and acetyltransferase activity was highly enriched at 4 dpi. CONCLUSIONS There was an early up-regulation of LRR-RKs, different between susceptible and resistant genotypes; subsequently, distinct sets of genes associated with defense response were up-regulated. Differences in expression profiles among the resistant genotypes indicate genotype-specific defense mechanisms. This study also shows a greater resemblance in transcriptomics of HC374 to Nyubai, consistent with their sharing of two FHB resistance QTLs on 3BS and 5AS, compared to Wuhan 1 which carries one QTL on 2DL in common with HC374.
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Affiliation(s)
- Youlian Pan
- Digital Technologies Research Centre, NRC, 1200 Montreal Road, Ottawa, ON, K1A 0R6, Canada.
| | - Ziying Liu
- Digital Technologies Research Centre, NRC, 1200 Montreal Road, Ottawa, ON, K1A 0R6, Canada
| | - Hélène Rocheleau
- Ottawa Research and Development Centre, AAFC, 960 Carling Ave, Ottawa, ON, K1A 0C6, Canada
| | - François Fauteux
- Digital Technologies Research Centre, NRC, 1200 Montreal Road, Ottawa, ON, K1A 0R6, Canada
| | - Yunli Wang
- Digital Technologies Research Centre, NRC, 1200 Montreal Road, Ottawa, ON, K1A 0R6, Canada
| | - Curt McCartney
- Morden Research and Development Centre, AAFC, 101 Route 100, Morden, MB, R6M 1Y5, Canada
| | - Thérèse Ouellet
- Ottawa Research and Development Centre, AAFC, 960 Carling Ave, Ottawa, ON, K1A 0C6, Canada.
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208
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Visser EA, Wegrzyn JL, Myburg AA, Naidoo S. Defence transcriptome assembly and pathogenesis related gene family analysis in Pinus tecunumanii (low elevation). BMC Genomics 2018; 19:632. [PMID: 30139335 PMCID: PMC6108113 DOI: 10.1186/s12864-018-5015-0] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2018] [Accepted: 08/14/2018] [Indexed: 12/23/2022] Open
Abstract
BACKGROUND Fusarium circinatum is a pressing threat to the cultivation of many economically important pine tree species. Efforts to develop effective disease management strategies can be aided by investigating the molecular mechanisms involved in the host-pathogen interaction between F. circinatum and pine species. Pinus tecunumanii and Pinus patula are two closely related tropical pine species that differ widely in their resistance to F. circinatum challenge, being resistant and susceptible respectively, providing the potential for a useful pathosystem to investigate the molecular responses underlying resistance to F. circinatum. However, no genomic resources are available for P. tecunumanii. Pathogenesis-related proteins are classes of proteins that play important roles in plant-microbe interactions, e.g. chitinases; proteins that break down the major structural component of fungal cell walls. Generating a reference sequence for P. tecunumanii and characterizing pathogenesis related gene families in these two pine species is an important step towards unravelling the pine-F. circinatum interaction. RESULTS Eight reference based and 12 de novo assembled transcriptomes were produced, for juvenile shoot tissue from both species. EvidentialGene pipeline redundancy reduction, expression filtering, protein clustering and taxonomic filtering produced a 50 Mb shoot transcriptome consisting of 28,621 contigs for P. tecunumanii and a 72 Mb shoot transcriptome consisting of 52,735 contigs for P. patula. Predicted protein sequences encoded by the assembled transcriptomes were clustered with reference proteomes from 92 other species to identify pathogenesis related gene families in P. patula, P. tecunumanii and other pine species. CONCLUSIONS The P. tecunumanii transcriptome is the first gene catalogue for the species, representing an important resource for studying resistance to the pitch canker pathogen, F. circinatum. This study also constitutes, to our knowledge, the largest index of gymnosperm PR-genes to date.
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Affiliation(s)
- Erik A. Visser
- Department of Biochemistry, Genetics and Microbiology, Forestry and Agricultural Biotechnology Institute (FABI), Genomics Research Institute (GRI), University of Pretoria, Private bag X20, Pretoria, 0028 South Africa
| | - Jill L. Wegrzyn
- Department of Ecology and Evolutionary Biology, University of Connecticut, Storrs, CT 06269 USA
| | - Alexander A. Myburg
- Department of Biochemistry, Genetics and Microbiology, Forestry and Agricultural Biotechnology Institute (FABI), Genomics Research Institute (GRI), University of Pretoria, Private bag X20, Pretoria, 0028 South Africa
| | - Sanushka Naidoo
- Department of Biochemistry, Genetics and Microbiology, Forestry and Agricultural Biotechnology Institute (FABI), Genomics Research Institute (GRI), University of Pretoria, Private bag X20, Pretoria, 0028 South Africa
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209
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Huo Y, Kang JP, Park JK, Li J, Chen L, Yang DC. Rhodanobacter ginsengiterrae sp. nov., an antagonistic bacterium against root rot fungal pathogen Fusarium solani, isolated from ginseng rhizospheric soil. Arch Microbiol 2018; 200:1457-1463. [PMID: 30116848 DOI: 10.1007/s00203-018-1560-9] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2018] [Revised: 07/22/2018] [Accepted: 08/10/2018] [Indexed: 10/28/2022]
Abstract
A novel bacterium, designated DCY112T, was isolated from the rhizospheric soil of a ginseng-cultivated field in Gochang-gun, Republic of Korea. Based on 16S rRNA gene sequence analysis, this isolate was assigned to the genus Rhodanobacter and is closely related to Rhodanobacter soli DCY45T (98.0%) and R. umsongensis GR24-2T (98.0%). Strain DCY112T is Gram-negative, catalase- and oxidase-positive, aerobic, non-motile, rod-shaped, and produces yellow-pigmented colonies on R2A medium. Q-8 was the predominant respiratory quinone. The major cellular fatty acids were iso-C15:0, iso-C17:0, and summed feature 9 (iso-C17:1 ω9c and/or 10-methyl-C16:0). The major polar lipids were phosphatidylglycerol (PG), phosphatidylethanolamine (PE), an unknown amino lipid (AL1), and an unidentified polar lipid (L3). The genomic DNA G + C content was 65.2 mol%. DNA-DNA homology values between strain DCY112T and related strains were lower than 55%. The low DNA relatedness data in combination with phenotypic and genotypic tests indicated that strain DCY112T could not be assigned to a recognized species. Strain DCY112T showed antagonistic activity against the fungal pathogen Fusarium solani (KACC 44891T), which causes ginseng root rot. The results of this study support that strain DCY112T is a novel species belonging to the genus Rhodanobacter, for which the name Rhodanobacter ginsengiterrae is proposed. The type strain is DCY112T (= KCTC 62018T = JCM 32167T).
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Affiliation(s)
- Yue Huo
- Department of Oriental Medicinal Biotechnology, Kyung Hee University, Seocheon-dong, Giheung-gu, Yongin, Gyeonggi, 17104, Republic of Korea
| | - Jong-Pyo Kang
- Department of Oriental Medicinal Biotechnology, Kyung Hee University, Seocheon-dong, Giheung-gu, Yongin, Gyeonggi, 17104, Republic of Korea
| | - Jin-Kyu Park
- Graduate School of Biotechnology, College of Life Sciences, Kyung Hee University, Seocheon-dong, Giheung-gu, Yongin, Gyeonggi, 17104, Republic of Korea
| | - Jinfeng Li
- Department of Oriental Medicinal Biotechnology, Kyung Hee University, Seocheon-dong, Giheung-gu, Yongin, Gyeonggi, 17104, Republic of Korea
| | - Ling Chen
- Graduate School of Biotechnology, College of Life Sciences, Kyung Hee University, Seocheon-dong, Giheung-gu, Yongin, Gyeonggi, 17104, Republic of Korea
| | - Deok-Chun Yang
- Department of Oriental Medicinal Biotechnology, Kyung Hee University, Seocheon-dong, Giheung-gu, Yongin, Gyeonggi, 17104, Republic of Korea.
- Graduate School of Biotechnology, College of Life Sciences, Kyung Hee University, Seocheon-dong, Giheung-gu, Yongin, Gyeonggi, 17104, Republic of Korea.
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210
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Rai M, Ingle AP, Paralikar P, Anasane N, Gade R, Ingle P. Effective management of soft rot of ginger caused by Pythium spp. and Fusarium spp.: emerging role of nanotechnology. Appl Microbiol Biotechnol 2018; 102:6827-6839. [PMID: 29948111 DOI: 10.1007/s00253-018-9145-8] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2018] [Revised: 05/27/2018] [Accepted: 05/28/2018] [Indexed: 01/25/2023]
Abstract
Ginger (Zingiber officinale Rosc.) is a tropical plant cultivated all over the world due to its culinary and medicinal properties. It is one of the most important spices commonly used in food, which increases its commercial value. However, soft rot (rhizome rot) is a common disease of ginger caused by fungi such as Pythium and Fusarium spp. It is the most destructive disease of ginger, which can reduce the production by 50 to 90%. Application of chemical fungicides is considered as an effective method to control soft rot of ginger but extensive use of fungicides pose serious risk to environmental and human health. Therefore, the development of ecofriendly and economically viable alternative approaches for effective management of soft rot of ginger such diseases is essentially required. An acceptable approach that is being actively investigated involves nanotechnology, which can potentially be used to control Pythium and Fusarium. The present review is aimed to discuss worldwide status of soft rot associated with ginger, the traditional methods available for the management of Pythium and Fusarium spp. and most importantly, the role of various nanomaterials in the management of soft rot of ginger. Moreover, possible antifungal mechanisms for chemical fungicides, biological agents and nanoparticles have also been discussed.
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Affiliation(s)
- Mahendra Rai
- Nanobiotechnology Laboratory, Department of Biotechnology, SGB Amravati University, Amravati, Maharashtra, 444 602, India.
| | - Avinash P Ingle
- Department of Biotechnology, Engineering School of Lorena, University of Sao Paulo, Lorena, Sao Paulo, Brazil
| | - Priti Paralikar
- Nanobiotechnology Laboratory, Department of Biotechnology, SGB Amravati University, Amravati, Maharashtra, 444 602, India
| | - Netravati Anasane
- Nanobiotechnology Laboratory, Department of Biotechnology, SGB Amravati University, Amravati, Maharashtra, 444 602, India
| | - Rajendra Gade
- Department of Plant Pathology, Dr. Panjabrao Deshmukh Krishi Vidyapeeth, Akola, Maharashtra, India
| | - Pramod Ingle
- Nanobiotechnology Laboratory, Department of Biotechnology, SGB Amravati University, Amravati, Maharashtra, 444 602, India
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211
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Fernández-Bayo JD, Randall TE, Harrold DR, Achmon Y, Hestmark KV, Su J, Dahlquist-Willard RM, Gordon TR, Stapleton JJ, VanderGheynst JS, Simmons CW. Effect of management of organic wastes on inactivation of Brassica nigra and Fusarium oxysporum f.sp. lactucae using soil biosolarization. Pest Manag Sci 2018; 74:1892-1902. [PMID: 29446871 DOI: 10.1002/ps.4891] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2017] [Revised: 01/26/2018] [Accepted: 02/11/2018] [Indexed: 06/08/2023]
Abstract
BACKGROUND Soil biosolarization is a promising alternative to conventional fumigation. Volatile fatty acids (VFAs) produced in the soil through fermentation of amended organic matter can affect pest inactivation during biosolarization. The objective was to determine how soil amended with organic wastes that were partially stabilized through either composting or anaerobic digestion affected the inactivation of Brassica nigra (BN; a weed) and Fusarium oxysporum f. sp. lactucae (FOL; a phytopathogenic fungus). RESULTS The mortality of BN seeds in the biosolarized soil was 12% higher than in the solarized soil, although this difference was not significant. However, a significant correlation between BN mortality and VFA accumulation was observed. The number of FOL colony-forming units (CFU) in solarized samples at 5 cm was 34 CFU g-1 of soil, whereas in the biosolarized samples levels were below the limit of quantification. At 15 cm, these levels were 100 CFU g-1 for solarized samples and < 50 CFU g-1 of soil for the biosolarized samples. Amendment addition positively affected the organic matter and potassium content after the solarization process. CONCLUSION The organic waste stabilization method can impact downstream biosolarization performance and final pest inactivation levels. This study suggests that organic waste management practices can be leveraged to improve pest control and soil quality. © 2018 Society of Chemical Industry.
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Affiliation(s)
- Jesus Dionisio Fernández-Bayo
- Department of Food Science and Technology, University of California, Davis, CA, USA
- Department of Biological and Agricultural Engineering, University of California, Davis, CA, USA
| | - Tara E Randall
- Department of Biological and Agricultural Engineering, University of California, Davis, CA, USA
| | - Duff R Harrold
- Department of Biological and Agricultural Engineering, University of California, Davis, CA, USA
| | - Yigal Achmon
- Department of Food Science and Technology, University of California, Davis, CA, USA
- Department of Biological and Agricultural Engineering, University of California, Davis, CA, USA
| | - Kelley V Hestmark
- Department of Biological and Agricultural Engineering, University of California, Davis, CA, USA
| | - Joey Su
- Department of Food Science and Technology, University of California, Davis, CA, USA
| | | | - Thomas R Gordon
- Department of Plant Pathology, University of California, Davis, CA, USA
| | - James J Stapleton
- Statewide Integrated Pest Management Program, University of California, Kearney Agricultural Research and Extension Center, Parlier, CA, USA
| | - Jean S VanderGheynst
- Department of Biological and Agricultural Engineering, University of California, Davis, CA, USA
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212
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Smaoui S, Ennouri K, Chakchouk-Mtibaa A, Sellem I, Bouchaala K, Karray-Rebai I, Mellouli L. Statistical versus artificial intelligence -based modeling for the optimization of antifungal activity against Fusarium oxysporum using Streptomyces sp. strain TN71. J Mycol Med 2018; 28:551-560. [PMID: 30057154 DOI: 10.1016/j.mycmed.2018.07.003] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2018] [Revised: 07/06/2018] [Accepted: 07/10/2018] [Indexed: 11/17/2022]
Abstract
A Streptomyces sp. strain TN71 was isolated from Tunisian Saharan soil and selected for its antimicrobial activity against phytopathogenic fungi. In an attempt to increase its anti-Fusarium oxysporum activity, GYM+S (glucose, yeast extract, malt extract and starch) culture medium was selected out of five different production media. Plackett-Burman design (PBD) was used to select yeast extract, malt extract and calcium carbonate (CaCO3) as parameters having significant effects on antifungal activity, and a Box-Behnken design was applied for further optimization. The analysis revealed that the optimum concentrations for the anti-F. oxysporum activity of the tested variables were yeast extract 5.03g/L, malt extract 8.05g/L and CaCO3 4.51g/L. Artificial Neural Networks (ANNs): the Multilayer perceptron (MLP) and the Radial basis function (RBF) were created to predict the anti-F. oxysporum activity. The comparison between experimental and predicted outputs from ANN and Response Surface Methodology (RSM) were studied. The ANN model presents an improvement of 14.73%. To our knowledge, this is the first work reporting the statistical versus artificial intelligence -based modeling for the optimization of bioactive molecules against mycotoxigenic and phytopathogenic fungi.
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Affiliation(s)
- S Smaoui
- Laboratory of microorganisms and biomolecules of the centre of biotechnology of Sfax, road of Sidi Mansour Km 6, P.O. Box 1177, 3018 Sfax, Tunisia.
| | - K Ennouri
- Laboratory of microorganisms and biomolecules of the centre of biotechnology of Sfax, road of Sidi Mansour Km 6, P.O. Box 1177, 3018 Sfax, Tunisia
| | - A Chakchouk-Mtibaa
- Laboratory of microorganisms and biomolecules of the centre of biotechnology of Sfax, road of Sidi Mansour Km 6, P.O. Box 1177, 3018 Sfax, Tunisia
| | - I Sellem
- Laboratory of microorganisms and biomolecules of the centre of biotechnology of Sfax, road of Sidi Mansour Km 6, P.O. Box 1177, 3018 Sfax, Tunisia
| | - K Bouchaala
- Laboratory of microorganisms and biomolecules of the centre of biotechnology of Sfax, road of Sidi Mansour Km 6, P.O. Box 1177, 3018 Sfax, Tunisia
| | - I Karray-Rebai
- Laboratory of microorganisms and biomolecules of the centre of biotechnology of Sfax, road of Sidi Mansour Km 6, P.O. Box 1177, 3018 Sfax, Tunisia
| | - L Mellouli
- Laboratory of microorganisms and biomolecules of the centre of biotechnology of Sfax, road of Sidi Mansour Km 6, P.O. Box 1177, 3018 Sfax, Tunisia
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213
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Mayorquin JS, Carrillo JD, Twizeyimana M, Peacock BB, Sugino KY, Na F, Wang DH, Kabashima JN, Eskalen A. Chemical Management of Invasive Shot Hole Borer and Fusarium Dieback in California Sycamore (Platanus racemosa) in Southern California. Plant Dis 2018; 102:1307-1315. [PMID: 30673581 DOI: 10.1094/pdis-10-17-1569-re] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Fusarium dieback (FD) is a new vascular disease of hardwood trees caused by Fusarium spp. and other associated fungal species which are vectored by two recently introduced and highly invasive species of ambrosia beetle (Euwallacea spp. nr. fornicatus). One of these ambrosia beetles is known as the polyphagous shot hole borer (PSHB) and the other as the Kuroshio shot hole borer (KSHB). Together with the fungi that they vector, this pest-disease complex is known as the shot hole borer-Fusarium dieback (SHB-FD) complex. Mitigation of this pest-disease complex currently relies on tree removal; however, this practice is expensive and impractical given the wide host range and rapid advancement of the beetles throughout hardwoods in southern California. This study reports on the assessment of various pesticides for use in the management of SHB-FD. In vitro screening of 13 fungicides revealed that pyraclostrobin, trifloxystrobin, and azoxystrobin generally have lower effective concentration that reduces 50% of mycelial growth (EC50) values across all fungal symbionts of PSHB and KSHB; metconazole was found to have lower EC50 values for Fusarium spp. and Paracremonium pembeum. Triadimefon and fluxapyroxad were not capable of inhibiting any fungal symbiont at the concentrations tested. A 1-year field study showed that two insecticides, emamectin benzoate alone and in combination with propiconazole, and bifenthrin, could significantly reduce SHB attacks. Two injected fungicides (tebuconazole and a combination of carbendazim and debacarb) and one spray fungicide (metconazole) could also significantly reduce SHB attacks. Bioassays designed to assess fungicide retention 1 year postapplication revealed that six of the seven fungicides exhibited some level of inhibition in vitro and all thiabendazole-treated trees sampled exhibiting inhibition. This study has identified several pesticides which can be implemented as part of an integrated pest management strategy to reduce SHB infestation in low to moderately infested landscape California sycamore trees and potentially other landscape trees currently affected by SHB-FD.
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Affiliation(s)
- Joey S Mayorquin
- Department of Microbiology and Plant Pathology, University of California, Riverside 92521
| | - Joseph D Carrillo
- Department of Microbiology and Plant Pathology, University of California, Riverside 92521
| | - Mathias Twizeyimana
- Department of Microbiology and Plant Pathology, University of California, Riverside 92521
| | - Beth B Peacock
- Department of Microbiology and Plant Pathology, University of California, Riverside 92521
| | - Kameron Y Sugino
- Department of Microbiology and Plant Pathology, University of California, Riverside 92521
| | - Francis Na
- Department of Microbiology and Plant Pathology, University of California, Riverside 92521
| | - Danny H Wang
- Department of Microbiology and Plant Pathology, University of California, Riverside 92521
| | - John N Kabashima
- University of California Cooperative Extension (Orange County), Irvine 92618
| | - Akif Eskalen
- Department of Plant Pathology, University of California, Davis
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214
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Li M, Li T, Duan Y, Yang Y, Wu J, Zhao D, Xiao X, Pan X, Chen W, Wang J, Chen C, Zhou M. Evaluation of Phenamacril and Ipconazole for Control of Rice Bakanae Disease Caused by Fusarium fujikuroi. Plant Dis 2018; 102:1234-1239. [PMID: 30673573 DOI: 10.1094/pdis-10-17-1521-re] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
This study evaluated the use of phenamacril and ipconazole, alone and in mixtures, for the control of rice bakanae disease caused by Fusarium fujikuroi. Mixtures were studied with the goal of reducing the selection of fungicide-resistant field isolates of the fungus. When tested alone, both phenamacril and ipconazole exhibited high antifungal activity against F. fujikuroi mycelial growth; the average EC50 value for 19 field isolates was 0.1544 μg/ml for phenamacril and 0.0472 μg/ml for ipconazole. A 2:1 mixture of phenamacril and ipconazole caused a slightly synergistic (greater than additive) inhibition of mycelial growth. Inhibition of F. fujikuroi sporulation was highest for ipconazole alone, intermediate with the 2:1 mixture, and lowest for phenamacril alone. Inhibition by phenamacril and ipconazole alone or by the 2:1 mixture was substantially lower for spore germination than for mycelial growth or sporulation. When the total fungicide concentration was <24 g of a.i./100 kg of treated rice seeds, the fungicides, whether alone or in the 2:1 mixture, were not phytotoxic to seeds or seedlings of two rice cultivars. In a greenhouse experiment, the 2:1 mixture of phenamacril and ipconazole at 6 g of a.i./100 kg of treated seeds provided 100% control of rice bakanae disease on two cultivars. Overall, the results indicate that the use of a 2:1 mixture of phenamacril and ipconazole should control rice bakanae disease while reducing the occurrence of fungicide resistance in F. fujikuroi.
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Affiliation(s)
- Meixia Li
- College of Plant Protection, State & Local Joint Engineering Research Center of Green Pesticide Invention and Application, Nanjing Agricultural University, Nanjing, 210095, China
| | - Tao Li
- College of Plant Protection, State & Local Joint Engineering Research Center of Green Pesticide Invention and Application, Nanjing Agricultural University, Nanjing, 210095, China
| | - Yabing Duan
- College of Plant Protection, State & Local Joint Engineering Research Center of Green Pesticide Invention and Application, Nanjing Agricultural University, Nanjing, 210095, China
| | - Ying Yang
- College of Plant Protection, State & Local Joint Engineering Research Center of Green Pesticide Invention and Application, Nanjing Agricultural University, Nanjing, 210095, China
| | - Jian Wu
- College of Plant Protection, State & Local Joint Engineering Research Center of Green Pesticide Invention and Application, Nanjing Agricultural University, Nanjing, 210095, China
| | - Donglei Zhao
- College of Plant Protection, State & Local Joint Engineering Research Center of Green Pesticide Invention and Application, Nanjing Agricultural University, Nanjing, 210095, China
| | - Xuemei Xiao
- College of Plant Protection, State & Local Joint Engineering Research Center of Green Pesticide Invention and Application, Nanjing Agricultural University, Nanjing, 210095, China
| | - Xiayan Pan
- College of Plant Protection, State & Local Joint Engineering Research Center of Green Pesticide Invention and Application, Nanjing Agricultural University, Nanjing, 210095, China
| | - Weiwei Chen
- College of Plant Protection, State & Local Joint Engineering Research Center of Green Pesticide Invention and Application, Nanjing Agricultural University, Nanjing, 210095, China
| | - Jianxin Wang
- College of Plant Protection, State & Local Joint Engineering Research Center of Green Pesticide Invention and Application, Nanjing Agricultural University, Nanjing, 210095, China
| | - Changjun Chen
- College of Plant Protection, State & Local Joint Engineering Research Center of Green Pesticide Invention and Application, Nanjing Agricultural University, Nanjing, 210095, China
| | - Mingguo Zhou
- College of Plant Protection, State & Local Joint Engineering Research Center of Green Pesticide Invention and Application, Nanjing Agricultural University, Nanjing, 210095, China
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215
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Elmer W, De La Torre-Roche R, Pagano L, Majumdar S, Zuverza-Mena N, Dimkpa C, Gardea-Torresdey J, White JC. Effect of Metalloid and Metal Oxide Nanoparticles on Fusarium Wilt of Watermelon. Plant Dis 2018; 102:1394-1401. [PMID: 30673561 DOI: 10.1094/pdis-10-17-1621-re] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
This study explored the use of foliar sprays with nanoparticles (NP) of B, CuO, MnO, SiO, TiO, and ZnO to protect watermelon against Fusarium wilt. Leaves of young watermelon plants were sprayed (1 to 2 ml per plant) with NP suspensions (500 to 1,000 µg/ml) and were planted in potting mix infested with Fusarium oxysporum f. sp. niveum. In five of eight greenhouse experiments, CuO NP suppressed disease and, in six of eight experiments, CuO NP increased biomass or yield more than in untreated controls or other tested NP. More root Cu was detected in CuO NP-treated plants than other treatments (P = 0.015). In Griswold, CT, plants treated with CuO NP yielded 39% more fruit than untreated controls. In Hamden, CT, treatment with CuO NP produced 53% more fruit when compared with controls (P = 0.02) and was superior to other Cu fungicides. Gene expression in watermelon roots revealed strong upregulation of polyphenol oxidase (PPO) and PR1 genes when CuO NP and F. oxysporum f. sp. niveum were both present. Enzymatic assays for PPO supported the gene expression results. CuO NP may serve as a highly effective delivery agent for this micronutrient to suppress disease.
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Affiliation(s)
- Wade Elmer
- Department of Plant Pathology and Ecology, The Connecticut Agricultural Experiment Station, New Haven
| | | | - Luca Pagano
- Department of Chemistry, Life Sciences and Environmental Sustainability, University of Parma, 43124 Parma, Italy
| | - Sanghamitra Majumdar
- Department of Analytical Chemistry, The Connecticut Agricultural Experiment Station
| | - Nubia Zuverza-Mena
- Department of Analytical Chemistry, The Connecticut Agricultural Experiment Station
| | - Christian Dimkpa
- International Fertilizer Development Center, Muscle Shoals, AL, 35662
| | | | - Jason C White
- Department of Analytical Chemistry, The Connecticut Agricultural Experiment Station
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216
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Zheng H, Miao P, Lin X, Li L, Wu C, Chen X, Abubakar YS, Norvienyeku J, Li G, Zhou J, Wang Z, Zheng W. Small GTPase Rab7-mediated FgAtg9 trafficking is essential for autophagy-dependent development and pathogenicity in Fusarium graminearum. PLoS Genet 2018; 14:e1007546. [PMID: 30044782 PMCID: PMC6078321 DOI: 10.1371/journal.pgen.1007546] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2018] [Revised: 08/06/2018] [Accepted: 07/06/2018] [Indexed: 12/19/2022] Open
Abstract
Fusarium graminearum is a fungal pathogen that causes Fusarium head blight (FHB) in wheat and barley. Autophagy is a highly conserved vacuolar degradation pathway essential for cellular homeostasis in which Atg9 serves as a multispanning membrane protein important for generating membranes for the formation of phagophore assembly site. However, the mechanism of autophagy or autophagosome formation in phytopathogens awaits further clarifications. In this study, we identified and characterized the Atg9 homolog (FgAtg9) in F. graminearum by live cell imaging, biochemical and genetic analyses. We find that GFP-FgAtg9 localizes to late endosomes and trans-Golgi network under both nutrient-rich and nitrogen starvation conditions and also show its dynamic actin-dependent trafficking in the cell. Further targeted gene deletion of FgATG9 demonstrates that it is important for growth, aerial hyphae development, and pathogenicity in F. graminearum. Furthermore, the deletion mutant (ΔFgatg9) shows severe defects in autophagy and lipid metabolism in response to carbon starvation. Interestingly, small GTPase FgRab7 is found to be required for the dynamic trafficking of FgAtg9, and co-immunoprecipitation (Co-IP) assays show that FgAtg9 associates with FgRab7 in vivo. Finally, heterologous complementation assay shows that Atg9 is functionally conserved in F. graminearum and Magnaporthe oryzae. Taken together, we conclude that FgAtg9 is essential for autophagy-dependent development and pathogenicity of F. graminearum, which may be regulated by the small GTPase FgRab7.
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Affiliation(s)
- Huawei Zheng
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, College of Plant Protection, Fujian Agriculture and Forestry University, Fuzhou, China
- Fujian University Key Laboratory for Plant-Microbe Interaction, College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Pengfei Miao
- Fujian University Key Laboratory for Plant-Microbe Interaction, College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Xiaolian Lin
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, College of Plant Protection, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Lingping Li
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, College of Plant Protection, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Congxian Wu
- Fujian University Key Laboratory for Plant-Microbe Interaction, College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Xiaomin Chen
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, College of Plant Protection, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Yakubu Saddeeq Abubakar
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, College of Plant Protection, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Justice Norvienyeku
- Fujian University Key Laboratory for Plant-Microbe Interaction, College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Guangpu Li
- Department of Biochemistry and Molecular Biology, University of Oklahoma Health Sciences Center, Oklahoma City, United States of America
| | - Jie Zhou
- Fujian University Key Laboratory for Plant-Microbe Interaction, College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Zonghua Wang
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, College of Plant Protection, Fujian Agriculture and Forestry University, Fuzhou, China
- Fujian University Key Laboratory for Plant-Microbe Interaction, College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, China
- Institute of Oceanography, Minjiang University, Fuzhou, China
| | - Wenhui Zheng
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, College of Plant Protection, Fujian Agriculture and Forestry University, Fuzhou, China
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217
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Adisa IO, Reddy Pullagurala VL, Rawat S, Hernandez-Viezcas JA, Dimkpa CO, Elmer WH, White JC, Peralta-Videa JR, Gardea-Torresdey JL. Role of Cerium Compounds in Fusarium Wilt Suppression and Growth Enhancement in Tomato ( Solanum lycopersicum). J Agric Food Chem 2018; 66:5959-5970. [PMID: 29856619 DOI: 10.1021/acs.jafc.8b01345] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The use of nanoparticles in plant protection may reduce pesticide usage and contamination and increase food security. In this study, three-week-old Solanum lycopersicum seedlings were exposed, by root or foliar pathways, to CeO2 nanoparticles and cerium acetate at 50 and 250 mg/L prior to transplant into sterilized soil. One week later, the soil was inoculated with the fungal pathogen Fusarium oxysporum f. sp. lycopersici (1 g/kg), and the plants were cultivated to maturity in a greenhouse. Disease severity, biomass/yield, and biochemical and physiological parameters were analyzed in harvested plants. Disease severity was significantly reduced by 250 mg/L of nano-CeO2 and CeAc applied to the soil (53% and 35%, respectively) or foliage (57% and 41%, respectively), compared with non-treated infested controls. Overall, the findings show that nano-CeO2 has potential to suppress Fusarium wilt and improve the chlorophyll content in tomato plants.
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Affiliation(s)
- Ishaq O Adisa
- Environmental Science and Engineering PhD Program , The University of Texas at El Paso , 500 West University Avenue , El Paso , Texas 79968 , United States
- The Center for Nanotechnology and Agricultural Pathogen Suppression (CeNAPS) , New Haven , Connecticut 06511 , United States
| | - Venkata L Reddy Pullagurala
- Environmental Science and Engineering PhD Program , The University of Texas at El Paso , 500 West University Avenue , El Paso , Texas 79968 , United States
- University of California Center for Environmental Implications of Nanotechnology (UC CEIN), The University of Texas at El Paso , 500 West University Avenue , El Paso , Texas 79968 , United States
| | - Swati Rawat
- Environmental Science and Engineering PhD Program , The University of Texas at El Paso , 500 West University Avenue , El Paso , Texas 79968 , United States
- University of California Center for Environmental Implications of Nanotechnology (UC CEIN), The University of Texas at El Paso , 500 West University Avenue , El Paso , Texas 79968 , United States
| | - Jose A Hernandez-Viezcas
- Chemistry Department , The University of Texas at El Paso , 500 West University Avenue , El Paso , Texas 79968 , United States
- University of California Center for Environmental Implications of Nanotechnology (UC CEIN), The University of Texas at El Paso , 500 West University Avenue , El Paso , Texas 79968 , United States
| | - Christian O Dimkpa
- International Fertilizer Development Center , Muscle, Shoals , Alabama 35662 , United States
- The Center for Nanotechnology and Agricultural Pathogen Suppression (CeNAPS) , New Haven , Connecticut 06511 , United States
| | - Wade H Elmer
- The Center for Nanotechnology and Agricultural Pathogen Suppression (CeNAPS) , New Haven , Connecticut 06511 , United States
- The Connecticut Agricultural Experiment Station , New Haven , Connecticut 06511 , United States
| | - Jason C White
- The Center for Nanotechnology and Agricultural Pathogen Suppression (CeNAPS) , New Haven , Connecticut 06511 , United States
- The Connecticut Agricultural Experiment Station , New Haven , Connecticut 06511 , United States
| | - Jose R Peralta-Videa
- Environmental Science and Engineering PhD Program , The University of Texas at El Paso , 500 West University Avenue , El Paso , Texas 79968 , United States
- Chemistry Department , The University of Texas at El Paso , 500 West University Avenue , El Paso , Texas 79968 , United States
- University of California Center for Environmental Implications of Nanotechnology (UC CEIN), The University of Texas at El Paso , 500 West University Avenue , El Paso , Texas 79968 , United States
| | - Jorge L Gardea-Torresdey
- Environmental Science and Engineering PhD Program , The University of Texas at El Paso , 500 West University Avenue , El Paso , Texas 79968 , United States
- Chemistry Department , The University of Texas at El Paso , 500 West University Avenue , El Paso , Texas 79968 , United States
- The Center for Nanotechnology and Agricultural Pathogen Suppression (CeNAPS) , New Haven , Connecticut 06511 , United States
- University of California Center for Environmental Implications of Nanotechnology (UC CEIN), The University of Texas at El Paso , 500 West University Avenue , El Paso , Texas 79968 , United States
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218
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Wang C, Ulloa M, Duong T, Roberts PA. Quantitative Trait Loci Mapping of Multiple Independent Loci for Resistance to Fusarium oxysporum f. sp. vasinfectum Races 1 and 4 in an Interspecific Cotton Population. Phytopathology 2018; 108:759-767. [PMID: 29280416 DOI: 10.1094/phyto-06-17-0208-r] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Fusarium wilt, caused by the soilborne fungal pathogen Fusarium oxysporum f. sp. vasinfectum, is a vascular disease of cotton (Gossypium spp.). F. oxysporum f. sp. vasinfectum race 1 (FOV1) causes major plant injury and yield loss in G. hirsutum cultivars with coinfection with root-knot nematode (Meloidogyne incognita), while F. oxysporum f. sp. vasinfectum race 4 (FOV4) causes plant damage without nematode coinfection in G. hirsutum and in G. barbadense cultivars. Quantitative trait loci (QTL) analysis of the interspecific cross G. barbadense Pima S-7 × G. hirsutum Acala NemX revealed separate multiple loci determining resistance to FOV1 and FOV4, confirming that race specificity occurs in F. oxysporum f. sp. vasinfectum. Based on the area under the disease progress stairs, six major QTLs on chromosomes (Chrs) 1, 2, 12, 15 (2), and 21 contributing 7 to 15% to FOV1 resistance and two major QTLs on Chrs 14 and 17 contributing 12 to 33% to FOV4 resistance were identified. Minor-effect QTLs contributing to resistance to both FOV1 and FOV4 were also identified. These results define and establish a pathosystem of race-specific resistance under polygenic control. This research also validates the importance of previously reported markers and chromosome regions and adds new information for the location of F. oxysporum f. sp. vasinfectum resistance genes. Some F8 recombinant inbred lines have resistance to both FOV1 and FOV4 and also to root-knot nematode, providing multiple resistance sources for breeding.
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Affiliation(s)
- Congli Wang
- First, third, and fourth authors: University of California, Riverside, CA 92521; first author: Key Laboratory of Mollisols Agroecology, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Harbin, 150081, China; and second author: USDA-ARS, PA, CSRL, Plant Stress and Germplasm Development Research, Lubbock, TX 79415
| | - Mauricio Ulloa
- First, third, and fourth authors: University of California, Riverside, CA 92521; first author: Key Laboratory of Mollisols Agroecology, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Harbin, 150081, China; and second author: USDA-ARS, PA, CSRL, Plant Stress and Germplasm Development Research, Lubbock, TX 79415
| | - Tra Duong
- First, third, and fourth authors: University of California, Riverside, CA 92521; first author: Key Laboratory of Mollisols Agroecology, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Harbin, 150081, China; and second author: USDA-ARS, PA, CSRL, Plant Stress and Germplasm Development Research, Lubbock, TX 79415
| | - Philip A Roberts
- First, third, and fourth authors: University of California, Riverside, CA 92521; first author: Key Laboratory of Mollisols Agroecology, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Harbin, 150081, China; and second author: USDA-ARS, PA, CSRL, Plant Stress and Germplasm Development Research, Lubbock, TX 79415
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219
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Na F, Carrillo JD, Mayorquin JS, Ndinga-Muniania C, Stajich JE, Stouthamer R, Huang YT, Lin YT, Chen CY, Eskalen A. Two Novel Fungal Symbionts Fusarium kuroshium sp. nov. and Graphium kuroshium sp. nov. of Kuroshio Shot Hole Borer (Euwallacea sp. nr. fornicatus) Cause Fusarium Dieback on Woody Host Species in California. Plant Dis 2018; 102:1154-1164. [PMID: 30673440 DOI: 10.1094/pdis-07-17-1042-re] [Citation(s) in RCA: 49] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Shot hole borer (SHB)-Fusarium dieback (FD) is a new pest-disease complex affecting numerous tree species in California and is vectored by two distinct, but related ambrosia beetles (Euwallacea sp. nr. fornicatus) called polyphagous shot hole borer (PSHB) and Kuroshio shot hole borer (KSHB). These pest-disease complexes cause branch dieback and tree mortality on numerous wildland and landscape tree species, as well as agricultural tree species, primarily avocado. The recent discovery of KSHB in California initiated an investigation of fungal symbionts associated with the KSHB vector. Ten isolates of Fusarium sp. and Graphium sp., respectively, were recovered from the mycangia of adult KSHB females captured in three different locations within San Diego County and compared with the known symbiotic fungi of PSHB. Multigene phylogenetic analyses of the internal transcribed spacer region (ITS), translation elongation factor-1 alpha (TEF1-α), and RNA polymerase II subunit (RPB1, RPB2) regions as well as morphological comparisons revealed that two novel fungal associates Fusarium kuroshium sp. nov. and Graphium kuroshium sp. nov. obtained from KSHB were related to, but distinct from the fungal symbionts F. euwallaceae and G. euwallaceae associated with PSHB in California. Pathogenicity tests on healthy, young avocado plants revealed F. kuroshium and G. kuroshium to be pathogenic. Lesion lengths from inoculation of F. kuroshium were found to be significantly shorter compared with those caused by F. euwallaceae, while no difference in symptom severity was detected between Graphium spp. associated with KSHB and PSHB. These findings highlight the pest disease complexes of KSHB-FD and PSHB-FD as distinct, but collective threats adversely impacting woody hosts throughout California.
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Affiliation(s)
- Francis Na
- Department of Plant Pathology and Microbiology, University of California, Riverside, 92521
| | - Joseph D Carrillo
- Department of Plant Pathology and Microbiology, University of California, Riverside, 92521
| | - Joey S Mayorquin
- Department of Plant Pathology and Microbiology, University of California, Riverside, 92521
| | - Cedric Ndinga-Muniania
- Department of Plant Pathology and Microbiology, University of California, Riverside, 92521
| | - Jason E Stajich
- Department of Plant Pathology and Microbiology, University of California, Riverside, 92521
| | | | - Yin-Tse Huang
- Department of Plant Pathology, National Chung Hsing University, Taichung 402, Taiwan, ROC, and School of Forest Resources and Conservation, Institute of Food and Agricultural Sciences, University of Florida, Gainesville
| | - Yu-Ting Lin
- Department of Plant Pathology, National Chung Hsing University, Taichung 402, Taiwan, ROC
| | - Chi-Yu Chen
- Department of Plant Pathology, National Chung Hsing University, Taichung 402, Taiwan, ROC
| | - Akif Eskalen
- Department of Plant Pathology and Microbiology, University of California, Riverside, 92521
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220
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Cao L, Blekemolen MC, Tintor N, Cornelissen BJC, Takken FLW. The Fusarium oxysporum Avr2-Six5 Effector Pair Alters Plasmodesmatal Exclusion Selectivity to Facilitate Cell-to-Cell Movement of Avr2. Mol Plant 2018; 11:691-705. [PMID: 29481865 DOI: 10.1016/j.molp.2018.02.011] [Citation(s) in RCA: 49] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2017] [Revised: 02/13/2018] [Accepted: 02/13/2018] [Indexed: 05/03/2023]
Abstract
Pathogens use effector proteins to manipulate their hosts. During infection of tomato, the fungus Fusarium oxysporum secretes the effectors Avr2 and Six5. Whereas Avr2 suffices to trigger I-2-mediated cell death in heterologous systems, both effectors are required for I-2-mediated disease resistance in tomato. How Six5 participates in triggering resistance is unknown. Using bimolecular fluorescence complementation assays we found that Avr2 and Six5 interact at plasmodesmata. Single-cell transformation revealed that a 2xRFP marker protein and Avr2-GFP only move to neighboring cells in the presence of Six5. Six5 alone does not alter plasmodesmatal transduction as 2xRFP was only translocated in the presence of both effectors. In SIX5-expressing transgenic plants, the distribution of virally expressed Avr2-GFP, and subsequent onset of I-2-mediated cell death, differed from that in wild-type tomato. Taken together, our data show that in the presence of Six5, Avr2 moves from cell to cell, which in susceptible plants contributes to virulence, but in I-2 containing plants induces resistance.
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Affiliation(s)
- Lingxue Cao
- Molecular Plant Pathology, Swammerdam Institute for Life Science, University of Amsterdam, 1098 XH Amsterdam, the Netherlands
| | - Mila C Blekemolen
- Molecular Plant Pathology, Swammerdam Institute for Life Science, University of Amsterdam, 1098 XH Amsterdam, the Netherlands
| | - Nico Tintor
- Molecular Plant Pathology, Swammerdam Institute for Life Science, University of Amsterdam, 1098 XH Amsterdam, the Netherlands
| | - Ben J C Cornelissen
- Molecular Plant Pathology, Swammerdam Institute for Life Science, University of Amsterdam, 1098 XH Amsterdam, the Netherlands
| | - Frank L W Takken
- Molecular Plant Pathology, Swammerdam Institute for Life Science, University of Amsterdam, 1098 XH Amsterdam, the Netherlands.
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221
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Kurian SM, Di Pietro A, Read ND. Live-cell imaging of conidial anastomosis tube fusion during colony initiation in Fusarium oxysporum. PLoS One 2018; 13:e0195634. [PMID: 29734342 PMCID: PMC5937734 DOI: 10.1371/journal.pone.0195634] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2017] [Accepted: 03/26/2018] [Indexed: 01/07/2023] Open
Abstract
Fusarium oxysporum exhibits conidial anastomosis tube (CAT) fusion during colony initiation to form networks of conidial germlings. Here we determined the optimal culture conditions for this fungus to undergo CAT fusion between microconidia in liquid medium. Extensive high resolution, confocal live-cell imaging was performed to characterise the different stages of CAT fusion, using genetically encoded fluorescent labelling and vital fluorescent organelle stains. CAT homing and fusion were found to be dependent on adhesion to the surface, in contrast to germ tube development which occurs in the absence of adhesion. Staining with fluorescently labelled concanavalin A indicated that the cell wall composition of CATs differs from that of microconidia and germ tubes. The movement of nuclei, mitochondria, vacuoles and lipid droplets through fused germlings was observed by live-cell imaging.
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Affiliation(s)
- Smija M. Kurian
- Manchester Fungal Infection Group, Institute of Inflammation and Repair, University of Manchester, Manchester, United Kingdom
| | - Antonio Di Pietro
- Departamento de Genetica, Universidad de Cordoba, Campus Rabanales C5, Cordoba, Spain
| | - Nick D. Read
- Manchester Fungal Infection Group, Institute of Inflammation and Repair, University of Manchester, Manchester, United Kingdom
- * E-mail:
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222
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Boonpa K, Tantong S, Weerawanich K, Panpetch P, Pringsulaka O, Yingchutrakul Y, Roytrakul S, Sirikantaramas S. Heterologous expression and antimicrobial activity of OsGASR3 from rice (Oryza sativa L.). J Plant Physiol 2018; 224-225:95-102. [PMID: 29614397 DOI: 10.1016/j.jplph.2018.03.013] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/06/2017] [Revised: 03/15/2018] [Accepted: 03/24/2018] [Indexed: 05/08/2023]
Abstract
According to an in silico analysis, OsGASR3 (LOC_Os03g55290) from rice (Oryza sativa L.) was predicted to be involved in plant defense mechanisms. A semi-quantitative reverse transcription polymerase chain reaction assay revealed that OsGASR3 is highly expressed in the inflorescences of Thai jasmine rice (O. sativa L. subsp. indica 'KDML 105'). To characterize the biological activity of OsGASR3, we produced an OsGASR3-glutathione S-transferase fusion protein in Escherichia coli Rosetta-gami (DE3) cells for a final purified recombinant OsGASR3 yield of 0.65 mg/L. The purified OsGASR3 inhibited the hyphal growth of Fusarium oxysporum f.sp. cubense and Helminthosporium oryzae at a relatively low concentration (7.5 μg/mL). Furthermore, OsGASR3 exhibited in planta inhibitory activity against Xanthomonas campestris, suggesting its involvement in defense mechanisms, in addition to its previously reported functions affecting growth and development. These observations indicate that recombinant OsGASR3 may be useful for protecting agriculturally important crops against pathogenic microbes.
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Affiliation(s)
- Krissana Boonpa
- Biotechnology Program, Faculty of Science, Chulalongkorn University, Bangkok, 10330, Thailand
| | - Supaluk Tantong
- Department of Biochemistry, Faculty of Science, Chulalongkorn University, Bangkok, 10330, Thailand.
| | - Kamonwan Weerawanich
- Department of Biochemistry, Faculty of Science, Chulalongkorn University, Bangkok, 10330, Thailand.
| | - Pawinee Panpetch
- Department of Biochemistry, Faculty of Science, Chulalongkorn University, Bangkok, 10330, Thailand.
| | - Onanong Pringsulaka
- Department of Microbiology, Faculty of Science, Srinakharinwirot University, Bangkok, 10110, Thailand.
| | - Yodying Yingchutrakul
- Genome Institute, National Center for Genetic Engineering and Biotechnology (BIOTEC), Pathumthani, 12120, Thailand.
| | - Sittiruk Roytrakul
- Genome Institute, National Center for Genetic Engineering and Biotechnology (BIOTEC), Pathumthani, 12120, Thailand.
| | - Supaart Sirikantaramas
- Department of Biochemistry, Faculty of Science, Chulalongkorn University, Bangkok, 10330, Thailand; Omics Sciences and Bioinformatics Center, Chulalongkorn University, Bangkok, 10330, Thailand.
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223
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Zhang Z, Ren W, Wang J, Chen W, Sang C, Chen C. Resistance risk assessment of Fusarium oxysporum f. sp. melonis against phenamacril, a myosin inhibitor. Pestic Biochem Physiol 2018; 147:127-132. [PMID: 29933982 DOI: 10.1016/j.pestbp.2017.09.014] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2017] [Revised: 09/12/2017] [Accepted: 09/27/2017] [Indexed: 06/08/2023]
Abstract
Fusarium wilt caused by Fusarium oxysporum f. sp. melonis (FOM) is one of the most notorious seed-borne diseases worldwide. Phenamacril is a cyanoacrylate fungicide with novel chemical structure and strong inhibitive activity against FOM. To evaluate the risk of FOM developing phenamacril resistance, five phenamacril-resistant mutants with >800μgml-1 minimum inhibitory concentration were obtained by repeated exposure to the fungicide in the laboratory. Compared with the parental isolate, four of the five phenamacril-resistant mutants showed enhanced biological fitness in sporulation and virulence, but not in sensitivity to various stresses (oxidative and osmotic pressure, cell membrane and wall inhibitor). No positive cross-resistance was observed among phenamacril and the other five fungicides, including azoxystrobin, carbendazim, boscalid, fluazinam and tebuconazole. Sequencing alignment results of the myosin 5 from the five resistant mutants and the parental strain indicated that the three resistant mutants fo-2, fo-3 and fo-4 had a single point mutation (S175L), which may confer the resistance of FOM against phenamacril. Interestingly, the resistant mutant fo-4 harbored not only one mutation (S175L) at myosin 5, but also the other mutation (A52G) at β2-tublin. Our data supported that resistance risk of Fusarium oxysporum f. sp. melonis against phenamacril was between the moderate to high level.
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Affiliation(s)
- Zhihui Zhang
- College of Plant Protection, Nanjing Agricultural University, Key Laboratory of Pesticide, Jiangsu Province, Nanjing 210095, China
| | - Weichao Ren
- College of Plant Protection, Nanjing Agricultural University, Key Laboratory of Pesticide, Jiangsu Province, Nanjing 210095, China
| | - Jin Wang
- College of Plant Protection, Nanjing Agricultural University, Key Laboratory of Pesticide, Jiangsu Province, Nanjing 210095, China
| | - Wenchan Chen
- College of Plant Protection, Nanjing Agricultural University, Key Laboratory of Pesticide, Jiangsu Province, Nanjing 210095, China
| | - Chengwei Sang
- College of Plant Protection, Nanjing Agricultural University, Key Laboratory of Pesticide, Jiangsu Province, Nanjing 210095, China
| | - Changjun Chen
- College of Plant Protection, Nanjing Agricultural University, Key Laboratory of Pesticide, Jiangsu Province, Nanjing 210095, China.
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224
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Zheng Z, Zhang Y, Wu X, Yang H, Ma L, Zhou M. FoMyo5 motor domain substitutions (Val 151 to Ala and Ser 418 to Thr) cause natural resistance to fungicide phenamacril in Fusarium oxysporum. Pestic Biochem Physiol 2018; 147:119-126. [PMID: 29933981 DOI: 10.1016/j.pestbp.2017.12.007] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2017] [Revised: 11/30/2017] [Accepted: 12/27/2017] [Indexed: 06/08/2023]
Abstract
Fusarium oxysporum (Fo) is an important genus of filamentous fungi that causes many devastating diseases of agronomical plants and some opportunistic diseases of humans. Previous studies have indicated that mutations in myosin5 acquired resistance to phenamacril in Fusarium graminearum (Fg). Here, we need to determine the residues of FoMyo5 involved in the natural resistance of plant pathogenic Fo strains. Six kinds of Fo reference strains from different hosts were studied. Fungicide susceptibility testing showed that these Fo strains demonstrated different resistance or susceptibility to phenamacril, which is Fusarium-specific antifungal compound, compared with Fg species. When aligned these homologous myosin5 motor domains of these strains, we found that the substitutions (Val151 to Ala and Ser418 to Thr) in FoMyo5 cause natural resistance to phenamacril in the plant pathogenic Fo strains. And we confirmed this result by gene replacement strategy. Such a phenomenon impeded the practical development of this fungicide for controlling vascular wilt diseases.
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Affiliation(s)
- Zhitian Zheng
- College of Plant Protection, Nanjing Agricultural University, Key Laboratory of Pesticide, Nanjing 210095, Jiangsu Province, China; School of Life Science and Food Engineering, Huaiyin Institute of Technology, Huaian 223003, Jiangsu Province, China
| | - Yong Zhang
- Department of Biochemistry and Molecular Biology, University of Massachusetts, Amherst 01003, MA, United States
| | - Xiaoyi Wu
- Department of Plant Pathology, University of Massachusetts, Amherst 01003, MA, United States
| | - He Yang
- Department of Biochemistry and Molecular Biology, University of Massachusetts, Amherst 01003, MA, United States
| | - Lijun Ma
- Department of Biochemistry and Molecular Biology, University of Massachusetts, Amherst 01003, MA, United States.
| | - Mingguo Zhou
- College of Plant Protection, Nanjing Agricultural University, Key Laboratory of Pesticide, Nanjing 210095, Jiangsu Province, China.
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225
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Buerstmayr M, Steiner B, Wagner C, Schwarz P, Brugger K, Barabaschi D, Volante A, Valè G, Cattivelli L, Buerstmayr H. High-resolution mapping of the pericentromeric region on wheat chromosome arm 5AS harbouring the Fusarium head blight resistance QTL Qfhs.ifa-5A. Plant Biotechnol J 2018; 16:1046-1056. [PMID: 29024288 PMCID: PMC5902775 DOI: 10.1111/pbi.12850] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2017] [Revised: 09/17/2017] [Accepted: 10/08/2017] [Indexed: 05/24/2023]
Abstract
The Qfhs.ifa-5A allele, contributing to enhanced Fusarium head blight resistance in wheat, resides in a low-recombinogenic region of chromosome 5A close to the centromere. A near-isogenic RIL population segregating for the Qfhs.ifa-5A resistance allele was developed and among 3650 lines as few as four recombined within the pericentromeric C-5AS1-0.40 bin, yielding only a single recombination point. Genetic mapping of the pericentromeric region using a recombination-dependent approach was thus not successful. To facilitate fine-mapping the physically large Qfhs.ifa-5A interval, two gamma-irradiated deletion panels were generated: (i) seeds of line NIL3 carrying the Qfhs.ifa-5A resistance allele in an otherwise susceptible background were irradiated and plants thereof were selfed to obtain deletions in homozygous state and (ii) a radiation hybrid panel was produced using irradiated pollen of the wheat line Chinese Spring (CS) for pollinating the CS-nullisomic5Atetrasomic5B. In total, 5157 radiation selfing and 276 radiation hybrid plants were screened for deletions on 5AS and plants containing deletions were analysed using 102 5AS-specific markers. Combining genotypic information of both panels yielded an 817-fold map improvement (cR/cM) for the centromeric bin and was 389-fold increased across the Qfhs.ifa-5A interval compared to the genetic map, with an average map resolution of 0.77 Mb/cR. We successfully proved that the RH mapping technique can effectively resolve marker order in low-recombining regions, including pericentromeric intervals, and simultaneously allow developing an in vivo panel of sister lines differing for induced deletions across the Qfhs.ifa-5A interval that can be used for phenotyping.
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Affiliation(s)
- Maria Buerstmayr
- Department of Agrobiotechnology TullnBOKU ‐ University of Natural Resources and Life Sciences, ViennaTullnAustria
| | - Barbara Steiner
- Department of Agrobiotechnology TullnBOKU ‐ University of Natural Resources and Life Sciences, ViennaTullnAustria
| | - Christian Wagner
- Department of Agrobiotechnology TullnBOKU ‐ University of Natural Resources and Life Sciences, ViennaTullnAustria
| | - Petra Schwarz
- Department of Agrobiotechnology TullnBOKU ‐ University of Natural Resources and Life Sciences, ViennaTullnAustria
| | - Klaus Brugger
- Department of Agrobiotechnology TullnBOKU ‐ University of Natural Resources and Life Sciences, ViennaTullnAustria
| | - Delfina Barabaschi
- Council for Agricultural Research and Economics (CREA)Genomics Research CentreFiorenzuola d'ArdaItaly
| | - Andrea Volante
- Council for Agricultural Research and Economics (CREA)Research Centre for Cereal and Industrial CropsVercelliItaly
| | - Giampiero Valè
- Council for Agricultural Research and Economics (CREA)Research Centre for Cereal and Industrial CropsVercelliItaly
| | - Luigi Cattivelli
- Council for Agricultural Research and Economics (CREA)Genomics Research CentreFiorenzuola d'ArdaItaly
| | - Hermann Buerstmayr
- Department of Agrobiotechnology TullnBOKU ‐ University of Natural Resources and Life Sciences, ViennaTullnAustria
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226
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Bryła M, Waśkiewicz A, Ksieniewicz-Woźniak E, Szymczyk K, Jędrzejczak R. Modified Fusarium Mycotoxins in Cereals and Their Products-Metabolism, Occurrence, and Toxicity: An Updated Review. Molecules 2018; 23:E963. [PMID: 29677133 PMCID: PMC6017960 DOI: 10.3390/molecules23040963] [Citation(s) in RCA: 74] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2018] [Revised: 04/05/2018] [Accepted: 04/17/2018] [Indexed: 02/03/2023] Open
Abstract
Mycotoxins are secondary fungal metabolites, toxic to humans, animals and plants. Under the influence of various factors, mycotoxins may undergo modifications of their chemical structure. One of the methods of mycotoxin modification is a transformation occurring in plant cells or under the influence of fungal enzymes. This paper reviews the current knowledge on the natural occurrence of the most important trichothecenes and zearalenone in cereals/cereal products, their metabolism, and the potential toxicity of the metabolites. Only very limited data are available for the majority of the identified mycotoxins. Most studies concern biologically modified trichothecenes, mainly deoxynivalenol-3-glucoside, which is less toxic than its parent compound (deoxynivalenol). It is resistant to the digestion processes within the gastrointestinal tract and is not absorbed by the intestinal epithelium; however, it may be hydrolysed to free deoxynivalenol or deepoxy-deoxynivalenol by the intestinal microflora. Only one zearalenone derivative, zearalenone-14-glucoside, has been extensively studied. It appears to be more reactive than deoxynivalenol-3-glucoside. It may be readily hydrolysed to free zearalenone, and the carbonyl group in its molecule may be easily reduced to α/β-zearalenol and/or other unspecified metabolites. Other derivatives of deoxynivalenol and zearalenone are poorly characterised. Moreover, other derivatives such as glycosides of T-2 and HT-2 toxins have only recently been investigated; thus, the data related to their toxicological profile and occurrence are sporadic. The topics described in this study are crucial to ensure food and feed safety, which will be assisted by the provision of widespread access to such studies and obtained results.
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Affiliation(s)
- Marcin Bryła
- Department of Food Analysis, Prof. Waclaw Dabrowski Institute of Agricultural and Food Biotechnology, Rakowiecka 36, 02-532 Warsaw, Poland.
| | - Agnieszka Waśkiewicz
- Department of Chemistry, Poznan University of Life Sciences, Wojska Polskiego 75, 60-625 Poznan, Poland.
| | - Edyta Ksieniewicz-Woźniak
- Department of Food Analysis, Prof. Waclaw Dabrowski Institute of Agricultural and Food Biotechnology, Rakowiecka 36, 02-532 Warsaw, Poland.
| | - Krystyna Szymczyk
- Department of Food Analysis, Prof. Waclaw Dabrowski Institute of Agricultural and Food Biotechnology, Rakowiecka 36, 02-532 Warsaw, Poland.
| | - Renata Jędrzejczak
- Department of Food Analysis, Prof. Waclaw Dabrowski Institute of Agricultural and Food Biotechnology, Rakowiecka 36, 02-532 Warsaw, Poland.
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227
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Mafu S, Ding Y, Murphy KM, Yaacoobi O, Addison JB, Wang Q, Shen Z, Briggs SP, Bohlmann J, Castro-Falcon G, Hughes CC, Betsiashvili M, Huffaker A, Schmelz EA, Zerbe P. Discovery, Biosynthesis and Stress-Related Accumulation of Dolabradiene-Derived Defenses in Maize. Plant Physiol 2018; 176:2677-2690. [PMID: 29475898 PMCID: PMC5884620 DOI: 10.1104/pp.17.01351] [Citation(s) in RCA: 68] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2017] [Accepted: 02/16/2018] [Indexed: 05/18/2023]
Abstract
Terpenoids are a major component of maize (Zea mays) chemical defenses that mediate responses to herbivores, pathogens, and other environmental challenges. Here, we describe the biosynthesis and elicited production of a class of maize diterpenoids, named dolabralexins. Dolabralexin biosynthesis involves the sequential activity of two diterpene synthases, ENT-COPALYL DIPHOSPHATE SYNTHASE (ZmAN2) and KAURENE SYNTHASE-LIKE4 (ZmKSL4). Together, ZmAN2 and ZmKSL4 form the diterpene hydrocarbon dolabradiene. In addition, we biochemically characterized a cytochrome P450 monooxygenase, ZmCYP71Z16, which catalyzes the oxygenation of dolabradiene to yield the epoxides 15,16-epoxydolabrene (epoxydolabrene) and 3β-hydroxy-15,16-epoxydolabrene (epoxydolabranol). The absence of dolabradiene and epoxydolabranol in Zman2 mutants under elicited conditions confirmed the in vivo biosynthetic requirement of ZmAN2. Combined mass spectrometry and NMR experiments demonstrated that much of the epoxydolabranol is further converted into 3β,15,16-trihydroxydolabrene (trihydroxydolabrene). Metabolite profiling of field-grown maize root tissues indicated that dolabralexin biosynthesis is widespread across common maize cultivars, with trihydroxydolabrene as the predominant diterpenoid. Oxidative stress induced dolabralexin accumulation and transcript expression of ZmAN2 and ZmKSL4 in root tissues, and metabolite and transcript accumulation were up-regulated in response to elicitation with the fungal pathogens Fusarium verticillioides and Fusarium graminearum Consistently, epoxydolabranol significantly inhibited the growth of both pathogens in vitro at 10 µg mL-1, while trihydroxydolabrene-mediated inhibition was specific to Fverticillioides These findings suggest that dolabralexins have defense-related roles in maize stress interactions and expand the known chemical space of diterpenoid defenses as genetic targets for understanding and ultimately improving maize resilience.
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Affiliation(s)
- Sibongile Mafu
- Department of Plant Biology, University of California, Davis, California
| | - Yezhang Ding
- Section of Cell and Developmental Biology, University of California, La Jolla, California
| | - Katherine M Murphy
- Department of Plant Biology, University of California, Davis, California
| | - Omar Yaacoobi
- Department of Plant Biology, University of California, Davis, California
| | - J Bennett Addison
- Department of Chemistry, San Diego State University, San Diego, California
| | - Qiang Wang
- College of Agronomy and Institute of Ecological Agriculture, Sichuan Agricultural University, Chengdu 611130, China
| | - Zhouxin Shen
- Section of Cell and Developmental Biology, University of California, La Jolla, California
| | - Steven P Briggs
- Section of Cell and Developmental Biology, University of California, La Jolla, California
| | - Jörg Bohlmann
- Michael Smith Laboratories, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z4
| | - Gabriel Castro-Falcon
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California, La Jolla, California
| | - Chambers C Hughes
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California, La Jolla, California
| | - Mariam Betsiashvili
- Section of Cell and Developmental Biology, University of California, La Jolla, California
| | - Alisa Huffaker
- Section of Cell and Developmental Biology, University of California, La Jolla, California
| | - Eric A Schmelz
- Section of Cell and Developmental Biology, University of California, La Jolla, California
| | - Philipp Zerbe
- Department of Plant Biology, University of California, Davis, California
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228
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Zhao L, Ma X, Su P, Ge W, Wu H, Guo X, Li A, Wang H, Kong L. Cloning and characterization of a specific UDP-glycosyltransferase gene induced by DON and Fusarium graminearum. Plant Cell Rep 2018; 37:641-652. [PMID: 29372381 DOI: 10.1007/s00299-018-2257-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2017] [Accepted: 01/11/2018] [Indexed: 05/09/2023]
Abstract
TaUGT5: can reduce the proliferation and destruction of F. graminearum and enhance the ability of FHB resistance in wheat. Deoxynivalenol (DON) is one of the most important toxins produced by Fusarium species that enhances the spread of the pathogen in the host. As a defense, the UDP-glycosyltransferase (UGT) family has been deduced to transform DON into the less toxic form DON-3-O-glucoside (D3G), but the specific gene member in wheat that is responsible for Fusarium head blight (FHB) resistance has been little investigated and proved. In this study, a DON and Fusarium graminearum responsive gene TaUGT5, which is specific for resistant cultivars, was cloned with a 1431 bp open reading frame (ORF) encoding 476 amino acids in Sumai3. TaUGT5 is located on chromosome 2B, which has been confirmed in nulli-tetrasomic lines of Chinese Spring (CS) and is solely expressed among three homologs on the A, B and D genomes. Over-expression of this gene in Arabidopsis conferred enhanced tolerance when grown on agar plates that contain DON. Similarly, the coleoptiles of wheat over-expressing TaUGT5 showed more resistance to F. graminearum, evidencing reduced proliferation and destruction of plant tissue by the pathogen. However, the disease resistance in spikes was not as significant as that on coleoptile compared with wild-type plants. A subcellular localization analysis revealed that TaUGT5 was localized on the plasma membrane of tobacco leaf epidermal cells. It is possible that TaUGT5 could enhance tolerance to DON, protect the plant cell from the pathogen infection and result in better maintenance of the cell structure, which slows down pathogen proliferation in plant tissue.
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Affiliation(s)
- Lanfei Zhao
- State Key Laboratory of Crop Biology/Shandong Key Laboratory of Crop Biology, College of Agronomy, Shandong Agricultural University, 61 Daizong Street, Tai'an, 271018, Shandong, People's Republic of China
| | - Xin Ma
- State Key Laboratory of Crop Biology/Shandong Key Laboratory of Crop Biology, College of Agronomy, Shandong Agricultural University, 61 Daizong Street, Tai'an, 271018, Shandong, People's Republic of China
| | - Peisen Su
- State Key Laboratory of Crop Biology/Shandong Key Laboratory of Crop Biology, College of Agronomy, Shandong Agricultural University, 61 Daizong Street, Tai'an, 271018, Shandong, People's Republic of China
| | - Wenyang Ge
- State Key Laboratory of Crop Biology/Shandong Key Laboratory of Crop Biology, College of Agronomy, Shandong Agricultural University, 61 Daizong Street, Tai'an, 271018, Shandong, People's Republic of China
| | - Hongyan Wu
- Shandong AgrUnir. Fert. SciTech. Co., Ltd, Feicheng, 271600, People's Republic of China
| | - Xiuxiu Guo
- Shandong Academy of Agricultural Sciences, Jinan, 250100, People's Republic of China
| | - Anfei Li
- State Key Laboratory of Crop Biology/Shandong Key Laboratory of Crop Biology, College of Agronomy, Shandong Agricultural University, 61 Daizong Street, Tai'an, 271018, Shandong, People's Republic of China
| | - Hongwei Wang
- State Key Laboratory of Crop Biology/Shandong Key Laboratory of Crop Biology, College of Agronomy, Shandong Agricultural University, 61 Daizong Street, Tai'an, 271018, Shandong, People's Republic of China.
| | - Lingrang Kong
- State Key Laboratory of Crop Biology/Shandong Key Laboratory of Crop Biology, College of Agronomy, Shandong Agricultural University, 61 Daizong Street, Tai'an, 271018, Shandong, People's Republic of China.
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229
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Lu S, Edwards MC. Molecular Characterization and Functional Analysis of PR-1-Like Proteins Identified from the Wheat Head Blight Fungus Fusarium graminearum. Phytopathology 2018; 108:510-520. [PMID: 29117786 DOI: 10.1094/phyto-08-17-0268-r] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
The group 1 pathogenesis-related (PR-1) proteins originally identified from plants and their homologs are also found in other eukaryotic kingdoms. Studies on nonplant PR-1-like (PR-1L) proteins have been pursued widely in humans and animals but rarely in filamentous ascomycetes. Here, we report the characterization of four PR-1L proteins identified from the ascomycete fungus Fusarium graminearum, the primary cause of Fusarium head blight of wheat and barley (designated FgPR-1L). Molecular cloning revealed that the four FgPR-1L proteins are all encoded by small open reading frames (612 to 909 bp) that are often interrupted by introns, in contrast to plant PR-1 genes that lack introns. Sequence analysis indicated that all FgPR-1L proteins contain the PR-1-specific three-dimensional structure, and one of them features a C-terminal transmembrane (TM) domain that has not been reported for any stand-alone PR-1 proteins. Transcriptional analysis revealed that the four FgPR-1L genes are expressed in axenic cultures and in planta with different spatial or temporal expression patterns. Phylogenetic analysis indicated that fungal PR-1L proteins fall into three major groups, one of which harbors FgPR-1L-2-related TM-containing proteins from both phytopathogenic and human-pathogenic ascomycetes. Low-temperature sodium dodecyl sulfate polyacrylamide gel electrophoresis and proteolytic assays indicated that the recombinant FgPR-1L-4 protein exists as a monomer and is resistant to subtilisin of the serine protease family. Functional analysis confirmed that deletion of the FgPR-1L-4 gene from the fungal genome results in significantly reduced virulence on susceptible wheat. This study provides the first example that the F. graminearum-wheat interaction involves a pathogen-derived PR-1L protein that affects fungal virulence on the host.
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Affiliation(s)
- Shunwen Lu
- United States Department of Agriculture-Agricultural Research Service, Cereal Crops Research Unit, Fargo, ND 58102-2765
| | - Michael C Edwards
- United States Department of Agriculture-Agricultural Research Service, Cereal Crops Research Unit, Fargo, ND 58102-2765
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230
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Mitsuboshi M, Kioka Y, Noguchi K, Asakawa S. Evaluation of Suppressiveness of Soils Exhibiting Soil-Borne Disease Suppression after Long-Term Application of Organic Amendments by the Co-cultivation Method of Pathogenic Fusarium oxysporum and Indigenous Soil Microorganisms. Microbes Environ 2018; 33:58-65. [PMID: 29459498 PMCID: PMC5877344 DOI: 10.1264/jsme2.me17072] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2017] [Accepted: 12/02/2017] [Indexed: 11/30/2022] Open
Abstract
Preventive measures against soil-borne diseases need to be implemented before cultivation because very few countermeasures are available after the development of diseases. Some soils suppress soil-borne diseases despite the presence of a high population density of pathogens. If the suppressiveness of soil against soil-borne diseases may be predicted and diagnosed for crop fields, it may be possible to reduce the labor and cost associated with excessive disinfection practices. We herein evaluated the suppressiveness of soils in fields with the long-term application of organic amendments by examining the growth of pathogenic Fusarium oxysporum co-cultivated with indigenous soil microorganisms on agar plates. Soils treated with coffee residue compost or rapeseed meal showed suppressiveness against spinach wilt disease by F. oxysporum f. sp. spinaciae or spinach wilt and lettuce root rot diseases by F. oxysporum f. sp. spinaciae and F. oxysporum f. sp. lactucae, respectively, and the growth of pathogenic Fusarium spp. on agar plates was suppressed when co-cultured with microorganisms in a suspension from these soils before crop cultivation. These results indicate the potential of the growth degree of pathogenic F. oxysporum estimated by this method as a diagnostic indicator of the suppressiveness of soil associated with the inhabiting microorganisms. A correlation was found between the incidence of spinach wilt disease in spinach and the growth degree of F. oxysporum f. sp. spinaciae by this co-cultivation method, indicating that suppressiveness induced by organic amendment applications against F. oxysporum f. sp. spinaciae is evaluable by this method. The co-cultivation method may be useful for predicting and diagnosing suppressiveness against soil-borne diseases.
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Affiliation(s)
- Masahiro Mitsuboshi
- Tsukuba Research Institute, Katakura & Co-op Agri Corporation5–5511 Namiki, Tsuchiura, Ibaraki 300–0061Japan
| | - Yuuzou Kioka
- Tsukuba Research Institute, Katakura & Co-op Agri Corporation5–5511 Namiki, Tsuchiura, Ibaraki 300–0061Japan
| | - Katsunori Noguchi
- Katakura & Co-op Agri Corporation1–8–10 Kudankita, Chiyoda, Tokyo 102–0073Japan
| | - Susumu Asakawa
- Graduate School of Bioagricultural Sciences, Nagoya University1 Furo-cho, Chikusa, Nagoya, Aichi 464–8601Japan
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231
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Merino D, Mansilla AY, Casalongué CA, Alvarez VA. Preparation, Characterization, and In Vitro Testing of Nanoclay Antimicrobial Activities and Elicitor Capacity. J Agric Food Chem 2018; 66:3101-3109. [PMID: 29509416 DOI: 10.1021/acs.jafc.8b00049] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Clay-based nanocomposites (nanoclays) are interesting systems to hold a wide type of active substances with a wide field of industrial applications. Bentonite-chitosan nanoclay was obtained via cationic exchange of natural bentonite (Bent) with an aqueous solution of chitosan (CS). Their physicochemical and morphological properties were discussed under the light of Fourier transform infrared spectroscopy, X-ray diffraction, thermogravimetric analysis, and scanning electron microscopy. Bent-CS characterization indicated that CS was intercalated in 10% (w/w). This polycationic polymer was oriented mostly in a monolayer arrangement, interacting by electrostatic forces between Bent sheets. The antimicrobial action of Bent-CS nanoclay was assayed onto phytopathogens, the bacterium model Pseudomonas syringe pv. tomato DC3000 ( Psy) and the necrotrophic fungus Fusarium solani f. sp. eumartii ( F. eumartii). In addition to demonstrating cell death on both microorganisms, Bent-CS exerted elicitor property on tomato plantlets. The biological actions of this natural nanomaterial might make it proper to be used in crops.
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Affiliation(s)
- Danila Merino
- Grupo de Materiales Compuestos Termoplásticos (CoMP), Instituto de Investigaciones en Ciencia y Tecnología de Materiales (INTEMA) , Universidad Nacional de Mar del Plata-Concejo Nacional de Investigaciones Científicas y Técnicas (CONICET) , Colon 10890 , 7600 Mar del Plata , Argentina
| | - Andrea Y Mansilla
- Instituto de Investigaciones Biológicas, UE CONICET-UNMdP, Facultad de Ciencias Exactas y Naturales , Universidad Nacional de Mar del Plata , Deán Funes 3250 , 7600 Mar del Plata , Argentina
| | - Claudia A Casalongué
- Instituto de Investigaciones Biológicas, UE CONICET-UNMdP, Facultad de Ciencias Exactas y Naturales , Universidad Nacional de Mar del Plata , Deán Funes 3250 , 7600 Mar del Plata , Argentina
| | - Vera A Alvarez
- Grupo de Materiales Compuestos Termoplásticos (CoMP), Instituto de Investigaciones en Ciencia y Tecnología de Materiales (INTEMA) , Universidad Nacional de Mar del Plata-Concejo Nacional de Investigaciones Científicas y Técnicas (CONICET) , Colon 10890 , 7600 Mar del Plata , Argentina
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232
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Christensen SA, Sims J, Vaughan MM, Hunter C, Block A, Willett D, Alborn HT, Huffaker A, Schmelz EA. Commercial hybrids and mutant genotypes reveal complex protective roles for inducible terpenoid defenses in maize. J Exp Bot 2018; 69:1693-1705. [PMID: 29361044 DOI: 10.1093/jxb/erx495] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2017] [Accepted: 12/21/2017] [Indexed: 06/07/2023]
Abstract
Plant defense research is facilitated by the use of genome-sequenced inbred lines; however, a foundational knowledge of interactions in commercial hybrids remains relevant to understanding mechanisms present in crops. Using an array of commercial maize hybrids, we quantified the accumulation patterns of defense-related metabolites and phytohormones in tissues challenged with diverse fungal pathogens. Across hybrids, Southern leaf blight (Cochliobolus heterostrophus) strongly elicited specific sesqui- and diterpenoid defenses, namely zealexin A4 (ZA4) and kauralexin diacids, compared with the stalk-rotting agents Fusarium graminearum and Colletotrichum graminicola. With respect to biological activity, ZA4 and kauralexin diacids demonstrated potent antimicrobial action against F. graminearum. Unexpectedly, ZA4 displayed an opposite effect on C. graminicola by promoting growth. Overall, a negative correlation was observed between total analyzed terpenoids and fungal growth. Statistical analyses highlighted kauralexin A3 and abscisic acid as metabolites most associated with fungal suppression. As an empirical test, mutants of the ent-copalyl diphosphate synthase Anther ear 2 (An2) lacking kauralexin biosynthetic capacity displayed increased susceptibility to C. heterostrophus and Fusarium verticillioides. Our results highlight a widely occurring defensive function of acidic terpenoids in commercial hybrids and the complex nature of elicited pathway products that display selective activities on fungal pathogen species.
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Affiliation(s)
- Shawn A Christensen
- Chemistry Research Unit, Center for Medical, Agricultural, and Veterinary Entomology, United States Department of Agriculture - Agricultural Research Service, Gainesville, FL, USA
| | - James Sims
- Department of Environmental Systems Science, ETH Zurich, Zurich, Switzerl
| | - Martha M Vaughan
- Mycotoxin Prevention and Applied Microbiology Research, United States Department of Agriculture - Agricultural Research Service, N. University St. Peoria, IL, USA
| | - Charles Hunter
- Chemistry Research Unit, Center for Medical, Agricultural, and Veterinary Entomology, United States Department of Agriculture - Agricultural Research Service, Gainesville, FL, USA
| | - Anna Block
- Chemistry Research Unit, Center for Medical, Agricultural, and Veterinary Entomology, United States Department of Agriculture - Agricultural Research Service, Gainesville, FL, USA
| | - Denis Willett
- Chemistry Research Unit, Center for Medical, Agricultural, and Veterinary Entomology, United States Department of Agriculture - Agricultural Research Service, Gainesville, FL, USA
| | - Hans T Alborn
- Chemistry Research Unit, Center for Medical, Agricultural, and Veterinary Entomology, United States Department of Agriculture - Agricultural Research Service, Gainesville, FL, USA
| | - Alisa Huffaker
- Section of Cell and Developmental Biology, University of California at San Diego, La Jolla, CA, USA
| | - Eric A Schmelz
- Section of Cell and Developmental Biology, University of California at San Diego, La Jolla, CA, USA
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233
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Shin J, Kim JE, Lee YW, Son H. Fungal Cytochrome P450s and the P450 Complement (CYPome) of Fusarium graminearum. Toxins (Basel) 2018; 10:E112. [PMID: 29518888 PMCID: PMC5869400 DOI: 10.3390/toxins10030112] [Citation(s) in RCA: 74] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2018] [Revised: 03/02/2018] [Accepted: 03/03/2018] [Indexed: 12/19/2022] Open
Abstract
Cytochrome P450s (CYPs), heme-containing monooxygenases, play important roles in a wide variety of metabolic processes important for development as well as biotic/trophic interactions in most living organisms. Functions of some CYP enzymes are similar across organisms, but some are organism-specific; they are involved in the biosynthesis of structural components, signaling networks, secondary metabolisms, and xenobiotic/drug detoxification. Fungi possess more diverse CYP families than plants, animals, or bacteria. Various fungal CYPs are involved in not only ergosterol synthesis and virulence but also in the production of a wide array of secondary metabolites, which exert toxic effects on humans and other animals. Although few studies have investigated the functions of fungal CYPs, a recent systematic functional analysis of CYP genes in the plant pathogen Fusarium graminearum identified several novel CYPs specifically involved in virulence, asexual and sexual development, and degradation of xenobiotics. This review provides fundamental information on fungal CYPs and a new platform for further metabolomic and biochemical studies of CYPs in toxigenic fungi.
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Affiliation(s)
| | | | | | - Hokyoung Son
- Department of Agricultural Biotechnology and Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul 08826, Korea; (J.S.); (J.-E.K.); (Y.-W.L.)
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234
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Blacutt AA, Gold SE, Voss KA, Gao M, Glenn AE. Fusarium verticillioides: Advancements in Understanding the Toxicity, Virulence, and Niche Adaptations of a Model Mycotoxigenic Pathogen of Maize. Phytopathology 2018; 108:312-326. [PMID: 28971734 DOI: 10.1094/phyto-06-17-0203-rvw] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The importance of understanding the biology of the mycotoxigenic fungus Fusarium verticillioides and its various microbial and plant host interactions is critical given its threat to maize, one of the world's most valuable food crops. Disease outbreaks and mycotoxin contamination of grain threaten economic returns and have grave implications for human and animal health and food security. Furthermore, F. verticillioides is a member of a genus of significant phytopathogens and, thus, data regarding its host association, biosynthesis of secondary metabolites, and other metabolic (degradative) capabilities are consequential to both basic and applied research efforts across multiple pathosystems. Notorious among its secondary metabolites are the fumonisin mycotoxins, which cause severe animal diseases and are implicated in human disease. Additionally, studies of these mycotoxins have led to new understandings of F. verticillioides plant pathogenicity and provide tools for research into cellular processes and host-pathogen interaction strategies. This review presents current knowledge regarding several significant lines of F. verticillioides research, including facets of toxin production, virulence, and novel fitness strategies exhibited by this fungus across rhizosphere and plant environments.
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Affiliation(s)
- Alex A Blacutt
- First and fourth authors: Department of Plant Pathology, University of Georgia, Athens 30602; and second, third, and fifth authors: United States Department of Agriculture-Agricultural Research Service, U.S. National Poultry Research Center, Toxicology and Mycotoxin Research Unit, Athens, GA 30605-2720
| | - Scott E Gold
- First and fourth authors: Department of Plant Pathology, University of Georgia, Athens 30602; and second, third, and fifth authors: United States Department of Agriculture-Agricultural Research Service, U.S. National Poultry Research Center, Toxicology and Mycotoxin Research Unit, Athens, GA 30605-2720
| | - Kenneth A Voss
- First and fourth authors: Department of Plant Pathology, University of Georgia, Athens 30602; and second, third, and fifth authors: United States Department of Agriculture-Agricultural Research Service, U.S. National Poultry Research Center, Toxicology and Mycotoxin Research Unit, Athens, GA 30605-2720
| | - Minglu Gao
- First and fourth authors: Department of Plant Pathology, University of Georgia, Athens 30602; and second, third, and fifth authors: United States Department of Agriculture-Agricultural Research Service, U.S. National Poultry Research Center, Toxicology and Mycotoxin Research Unit, Athens, GA 30605-2720
| | - Anthony E Glenn
- First and fourth authors: Department of Plant Pathology, University of Georgia, Athens 30602; and second, third, and fifth authors: United States Department of Agriculture-Agricultural Research Service, U.S. National Poultry Research Center, Toxicology and Mycotoxin Research Unit, Athens, GA 30605-2720
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235
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Lofgren LA, LeBlanc NR, Certano AK, Nachtigall J, LaBine KM, Riddle J, Broz K, Dong Y, Bethan B, Kafer CW, Kistler HC. Fusarium graminearum: pathogen or endophyte of North American grasses? New Phytol 2018; 217:1203-1212. [PMID: 29160900 PMCID: PMC5813145 DOI: 10.1111/nph.14894] [Citation(s) in RCA: 73] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/10/2017] [Accepted: 10/16/2017] [Indexed: 05/05/2023]
Abstract
Mycotoxin-producing Fusarium graminearum and related species cause Fusarium head blight on cultivated grasses, such as wheat and barley. However, these Fusarium species may have had a longer evolutionary history with North American grasses than with cultivated crops and may interact with the ancestral hosts in ways which are biochemically distinct. We assayed 25 species of asymptomatic native grasses for the presence of Fusarium species and confirmed infected grasses as hosts using re-inoculation tests. We examined seed from native grasses for the presence of mycotoxin-producing Fusarium species and evaluated the ability of these fungi to produce mycotoxins in both native grass and wheat hosts using biochemical analysis. Mycotoxin-producing Fusarium species were shown to be prevalent in phylogenetically diverse native grasses, colonizing multiple tissue types, including seeds, leaves and inflorescence structures. Artificially inoculated grasses accumulated trichothecenes to a much lesser extent than wheat, and naturally infected grasses showed little to no accumulation. Native North American grasses are commonly inhabited by Fusarium species, but appear to accommodate these toxigenic fungi differently from cultivated crops. This finding highlights how host identity and evolutionary history may influence the outcome of plant-fungal interactions and may inform future efforts in crop improvement.
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Affiliation(s)
- Lotus A. Lofgren
- Department of Plant and Microbial BiologyUniversity of MinnesotaSt PaulMN55108USA
| | | | - Amanda K. Certano
- Department of Plant and Microbial BiologyUniversity of MinnesotaSt PaulMN55108USA
| | | | - Kathryn M. LaBine
- Department of Plant and Microbial BiologyUniversity of MinnesotaSt PaulMN55108USA
| | - Jakob Riddle
- Cereal Disease LaboratoryUSDA ARSSt PaulMN55108USA
| | - Karen Broz
- Cereal Disease LaboratoryUSDA ARSSt PaulMN55108USA
| | - Yanhong Dong
- Department of Plant PathologyUniversity of MinnesotaSt PaulMN55108USA
| | - Bianca Bethan
- Metanomics GmbHRBP/HA ‐ Tegeler Weg 3310589BerlinGermany
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Troth EEG, Johnston JA, Dyer AT. Competition Between Fusarium pseudograminearum and Cochliobolus sativus Observed in Field and Greenhouse Studies. Phytopathology 2018; 108:215-222. [PMID: 28956711 DOI: 10.1094/phyto-03-17-0110-r] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Among root pathogens, one of the most documented antagonisms is the suppression of Cochliobolus sativus by Fusarium (roseum) species. Unfortunately, previous studies involved single isolates of each pathogen and thus, provided no indication of the spectrum of responses that occur across the respective species. To investigate the variability in interactions between Cochliobolus sativus and Fusarium pseudograminearum, field and greenhouse trials were conducted that included monitoring of spring wheat plant health and monitoring of pathogen populations via quantitative real-time polymerase chain reaction. The interactions between two isolates of C. sativus and four isolates of F. pseudograminearum were explored in three geographically distinct wheat fields. To complement field trials and to limit potentially confounding environmental variables that are often associated with field studies, greenhouse trials were performed that investigated the interactions among and between three isolates of C. sativus and four isolates of F. pseudograminearum. Across field locations, C. sativus isolate Cs2344 consistently and significantly reduced Fusarium populations by an average of 20.1%. Similarly, F. pseudograminearum isolate Fp2228 consistently and significantly reduced C. sativus field populations by an average of 30.9%. No interaction was detected in the field between pathogen species with regards to disease or crop losses. Greenhouse results confirmed a powerful (>99%), broadly effective suppression of Fusarium populations by isolate Cs2344. Among greenhouse trials, additional isolate-isolate interactions were observed affecting Fusarium populations. Due to lower C. sativus population sizes in greenhouse trials, significant Fusarium suppression of C. sativus was only detected in one isolate-isolate interaction. This study is the first to demonstrate suppression of Fusarium spp. by C. sativus in field and greenhouse settings. These findings also reveal a complex competitive interaction between these two pathogen species that was previously unknown.
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Affiliation(s)
- Erin E Gunnink Troth
- Department of Plant Sciences and Plant Pathology, Montana State University, Bozeman 59717-3150
| | - Jeffrey A Johnston
- Department of Plant Sciences and Plant Pathology, Montana State University, Bozeman 59717-3150
| | - Alan T Dyer
- Department of Plant Sciences and Plant Pathology, Montana State University, Bozeman 59717-3150
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237
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Jung B, Park J, Kim N, Li T, Kim S, Bartley LE, Kim J, Kim I, Kang Y, Yun K, Choi Y, Lee HH, Ji S, Lee KS, Kim BY, Shon JC, Kim WC, Liu KH, Yoon D, Kim S, Seo YS, Lee J. Cooperative interactions between seed-borne bacterial and air-borne fungal pathogens on rice. Nat Commun 2018; 9:31. [PMID: 29295978 PMCID: PMC5750236 DOI: 10.1038/s41467-017-02430-2] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2017] [Accepted: 11/30/2017] [Indexed: 11/23/2022] Open
Abstract
Bacterial-fungal interactions are widely found in distinct environments and contribute to ecosystem processes. Previous studies of these interactions have mostly been performed in soil, and only limited studies of aerial plant tissues have been conducted. Here we show that a seed-borne plant pathogenic bacterium, Burkholderia glumae (Bg), and an air-borne plant pathogenic fungus, Fusarium graminearum (Fg), interact to promote bacterial survival, bacterial and fungal dispersal, and disease progression on rice plants, despite the production of antifungal toxoflavin by Bg. We perform assays of toxoflavin sensitivity, RNA-seq analyses, lipid staining and measures of triacylglyceride content to show that triacylglycerides containing linolenic acid mediate resistance to reactive oxygen species that are generated in response to toxoflavin in Fg. As a result, Bg is able to physically attach to Fg to achieve rapid and expansive dispersal to enhance disease severity.
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Affiliation(s)
- Boknam Jung
- Department of Applied Biology, Dong-A University, Busan, 49315, Korea
| | - Jungwook Park
- Department of Microbiology, Pusan National University, Busan, 46269, Korea
| | - Namgyu Kim
- Department of Microbiology, Pusan National University, Busan, 46269, Korea
| | - Taiying Li
- Department of Applied Biology, Dong-A University, Busan, 49315, Korea
| | - Soyeon Kim
- Department of Applied Biology, Dong-A University, Busan, 49315, Korea
| | - Laura E Bartley
- Department of Microbiology and Plant Biology, University of Oklahoma, Norman, OK, 73019, USA
| | - Jinnyun Kim
- Department of Microbiology, Pusan National University, Busan, 46269, Korea
| | - Inyoung Kim
- Department of Microbiology, Pusan National University, Busan, 46269, Korea
| | - Yoonhee Kang
- Department of Applied Biology, Dong-A University, Busan, 49315, Korea
| | - Kihoon Yun
- Department of Applied Biology, Dong-A University, Busan, 49315, Korea
| | - Younghae Choi
- Department of Applied Biology, Dong-A University, Busan, 49315, Korea
| | - Hyun-Hee Lee
- Department of Microbiology, Pusan National University, Busan, 46269, Korea
| | - Sungyeon Ji
- Department of Applied Biology, Dong-A University, Busan, 49315, Korea
| | - Kwang Sik Lee
- Department of Applied Biology, Dong-A University, Busan, 49315, Korea
| | - Bo Yeon Kim
- Department of Applied Biology, Dong-A University, Busan, 49315, Korea
| | - Jong Cheol Shon
- BK21 Plus KNU Multi-Omics-Based Creative Drug Research Team, College of Pharmacy and Research Institute of Pharmaceutical Sciences, Kyungpook National University, Daegu, 41566, Korea
| | - Won Cheol Kim
- BK21 Plus KNU Multi-Omics-Based Creative Drug Research Team, College of Pharmacy and Research Institute of Pharmaceutical Sciences, Kyungpook National University, Daegu, 41566, Korea
| | - Kwang-Hyeon Liu
- BK21 Plus KNU Multi-Omics-Based Creative Drug Research Team, College of Pharmacy and Research Institute of Pharmaceutical Sciences, Kyungpook National University, Daegu, 41566, Korea
| | - Dahye Yoon
- Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University, Busan, 46269, Korea
| | - Suhkman Kim
- Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University, Busan, 46269, Korea
| | - Young-Su Seo
- Department of Microbiology, Pusan National University, Busan, 46269, Korea.
| | - Jungkwan Lee
- Department of Applied Biology, Dong-A University, Busan, 49315, Korea.
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238
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Mendes LW, Raaijmakers JM, de Hollander M, Mendes R, Tsai SM. Influence of resistance breeding in common bean on rhizosphere microbiome composition and function. ISME J 2018; 12:212-224. [PMID: 29028000 PMCID: PMC5739014 DOI: 10.1038/ismej.2017.158] [Citation(s) in RCA: 156] [Impact Index Per Article: 26.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2016] [Revised: 06/21/2017] [Accepted: 06/24/2017] [Indexed: 01/16/2023]
Abstract
The rhizosphere microbiome has a key role in plant growth and health, providing a first line of defense against root infections by soil-borne pathogens. Here, we investigated the composition and metabolic potential of the rhizobacterial community of different common bean (Phaseolus vulgaris) cultivars with variable levels of resistance to the fungal root pathogen Fusarium oxysporum (Fox). For the different bean cultivars grown in two soils with contrasting physicochemical properties and microbial diversity, rhizobacterial abundance was positively correlated with Fox resistance. Pseudomonadaceae, bacillaceae, solibacteraceae and cytophagaceae were more abundant in the rhizosphere of the Fox-resistant cultivar. Network analyses showed a modular topology of the rhizosphere microbiome of the Fox-resistant cultivar, suggesting a more complex and highly connected bacterial community than in the rhizosphere of the Fox-susceptible cultivar. Metagenome analyses further revealed that specific functional traits such as protein secretion systems and biosynthesis genes of antifungal phenazines and rhamnolipids were more abundant in the rhizobacterial community of the Fox-resistant cultivar. Our findings suggest that breeding for Fox resistance in common bean may have co-selected for other unknown plant traits that support a higher abundance of specific beneficial bacterial families in the rhizosphere with functional traits that reinforce the first line of defense.
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Affiliation(s)
- Lucas William Mendes
- Cell and Molecular Biology Laboratory, Center for Nuclear Energy in Agriculture CENA, University of Sao Paulo USP, Piracicaba, Brazil
- Department of Microbial Ecology, Netherlands Institute of Ecology NIOO-KNAW, Wageningen, The Netherlands
| | - Jos M Raaijmakers
- Department of Microbial Ecology, Netherlands Institute of Ecology NIOO-KNAW, Wageningen, The Netherlands
- Institute of Biology, Leiden University, Leiden, the Netherlands
| | - Mattias de Hollander
- Department of Microbial Ecology, Netherlands Institute of Ecology NIOO-KNAW, Wageningen, The Netherlands
| | | | - Siu Mui Tsai
- Cell and Molecular Biology Laboratory, Center for Nuclear Energy in Agriculture CENA, University of Sao Paulo USP, Piracicaba, Brazil
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239
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Camargo-Ramírez R, Val-Torregrosa B, San Segundo B. MiR858-Mediated Regulation of Flavonoid-Specific MYB Transcription Factor Genes Controls Resistance to Pathogen Infection in Arabidopsis. Plant Cell Physiol 2018; 59:190-204. [PMID: 29149328 DOI: 10.1093/pcp/pcx175] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/01/2017] [Accepted: 11/10/2017] [Indexed: 05/22/2023]
Abstract
MicroRNAs (miRNAs) are a class of short endogenous non-coding small RNAs that direct post-transcriptional gene silencing in eukaryotes. In plants, the expression of a large number of miRNAs has been shown to be regulated during pathogen infection. However, the functional role of the majority of these pathogen-regulated miRNAs has not been elucidated. In this work, we investigated the role of Arabidopsis miR858 in the defense response of Arabidopsis plants to infection by fungal pathogens with necrotrophic (Plectosphaerella cucumerina) or hemibiotrophic (Fusarium oxysporum and Colletotrichum higginsianum) lifestyles. Whereas overexpression of MIR858 enhances susceptibility to pathogen infection, interference with miR858 activity by target mimics (MIM858 plants) results in disease resistance. Upon pathogen challenge, stronger activation of the defense genes PDF1.2 and PR4 occurs in MIM858 plants than in wild-type plants, whereas pathogen infection induced weaker activation of these genes in MIR858 overexpressor plants. Reduced miR858 activity, and concomitant up-regulation of miR858 target genes, in MIM858 plants, also leads to accumulation of flavonoids in Arabidopsis leaves. The antifungal activity of phenylpropanoid compounds, including flavonoids, is presented. Furthermore, pathogen infection or treatment with fungal elicitors is accompanied by a gradual decrease in MIR858 expression in wild-type plants, suggesting that miR858 plays a role in PAMP (pathogen-associated molecular pattern)-triggered immunity. These data support that miR858 is a negative regulator of Arabidopsis immunity and provide new insights into the relevant role of miR858-mediated regulation of the phenylpropanoid biosynthetic pathway in controlling Arabidopsis immunity.
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Affiliation(s)
- Rosany Camargo-Ramírez
- Centre for Research in Agricultural Genomics (CRAG) CSIC-IRTA-UAB-UB, Campus Universitat Autònoma de Barcelona (UAB), Bellaterra (Cerdanyola del Vallés), 08193 Barcelona, Spain
| | - Beatriz Val-Torregrosa
- Centre for Research in Agricultural Genomics (CRAG) CSIC-IRTA-UAB-UB, Campus Universitat Autònoma de Barcelona (UAB), Bellaterra (Cerdanyola del Vallés), 08193 Barcelona, Spain
| | - Blanca San Segundo
- Centre for Research in Agricultural Genomics (CRAG) CSIC-IRTA-UAB-UB, Campus Universitat Autònoma de Barcelona (UAB), Bellaterra (Cerdanyola del Vallés), 08193 Barcelona, Spain
- Consejo Superior de Investigaciones Científicas (CSIC), Barcelona, Spain
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240
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Sharma P, Gangola MP, Huang C, Kutcher HR, Ganeshan S, Chibbar RN. Single Nucleotide Polymorphisms in B-Genome Specific UDP-Glucosyl Transferases Associated with Fusarium Head Blight Resistance and Reduced Deoxynivalenol Accumulation in Wheat Grain. Phytopathology® 2018; 108:124-132. [PMID: 29063821 DOI: 10.1094/phyto-04-17-0159-r] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
An in vitro spike culture method was optimized to evaluate Fusarium head blight (FHB) resistance in wheat (Triticum aestivum) and used to screen a population of ethyl methane sulfonate treated spike culture-derived variants (SCDV). Of the 134 SCDV evaluated, the disease severity score of 47 of the variants was ≤30%. Single nucleotide polymorphisms (SNP) in the UDP-glucosyltransferase (UGT) genes, TaUGT-2B, TaUGT-3B, and TaUGT-EST, differed between AC Nanda (an FHB-susceptible wheat variety) and Sumai-3 (an FHB-resistant wheat cultivar). SNP at 450 and 1,558 bp from the translation initiation site in TaUGT-2B and TaUGT-3B, respectively were negatively correlated with FHB severity in the SCDV population, whereas the SNP in TaUGT-EST was not associated with FHB severity. Fusarium graminearum strain M7-07-1 induced early expression of TaUGT-2B and TaUGT-3B in FHB-resistant SCDV lines, which were associated with deoxynivalenol accumulation and reduced FHB disease progression. At 8 days after inoculation, deoxynivalenol concentration varied from 767 ppm in FHB-resistant variants to 2,576 ppm in FHB-susceptible variants. The FHB-resistant SCDV identified can be used as new sources of FHB resistance in wheat improvement programs.
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Affiliation(s)
- Pallavi Sharma
- All authors: Department of Plant Sciences, University of Saskatchewan, 51 Campus Drive, Saskatoon, S7N 5A8, Saskatchewan, Canada
| | - Manu P Gangola
- All authors: Department of Plant Sciences, University of Saskatchewan, 51 Campus Drive, Saskatoon, S7N 5A8, Saskatchewan, Canada
| | - Chen Huang
- All authors: Department of Plant Sciences, University of Saskatchewan, 51 Campus Drive, Saskatoon, S7N 5A8, Saskatchewan, Canada
| | - H Randy Kutcher
- All authors: Department of Plant Sciences, University of Saskatchewan, 51 Campus Drive, Saskatoon, S7N 5A8, Saskatchewan, Canada
| | - Seedhabadee Ganeshan
- All authors: Department of Plant Sciences, University of Saskatchewan, 51 Campus Drive, Saskatoon, S7N 5A8, Saskatchewan, Canada
| | - Ravindra N Chibbar
- All authors: Department of Plant Sciences, University of Saskatchewan, 51 Campus Drive, Saskatoon, S7N 5A8, Saskatchewan, Canada
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241
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Volova TG, Prudnikova SV, Zhila NO. Fungicidal activity of slow-release P(3HB)/TEB formulations in wheat plant communities infected by Fusarium moniliforme. Environ Sci Pollut Res Int 2018; 25:552-561. [PMID: 29047062 DOI: 10.1007/s11356-017-0466-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2017] [Accepted: 10/10/2017] [Indexed: 06/07/2023]
Abstract
Fungicidal activity of experimental tebuconazole (TEB) formulations was investigated in laboratory soil ecosystems in wheat plant communities infected by Fusarium moniliforme. TEB was embedded in the matrix of poly-3-hydroxybutyrate, shaped as films and microgranules. These formulations were buried in the soil with wheat plants, and their efficacy was compared with that of commercial formulation Raxil and with the effect of pre-sowing treatment of seeds. In the experiment with the initially infected seeds and a relatively low level of natural soil infection caused by Fusarium fungi, the effects of the experimental P(3HB)/TEB formulations and Raxil were comparable. However, when the level of soil infection was increased by adding F. moniliforme spores, P(3HB)/TEB granules and films reduced the total counts of fungi and the abundance of F. moniliforme more effectively than Raxil. Seed treatment or soil treatment with Raxil solution showed an increase in the percentage of rot-damaged roots in the later stages of the experiment. In the early stage (between days 10 and 20), the percentage of rot-damaged roots in the soil with TEB embedded in the slowly degraded P(3HB) matrix was similar to that in the soil with Raxil. However, the efficacy of P(3HB)/TEB formulations lasted longer, and in later stages (between days 20 and 30), the percentage of rot-damaged roots in that group did not grow. In experiments with different TEB formulations and, hence, different fungicidal activities, the increase in plant biomass was 15-17 to 40-60% higher than in the groups where TEB was applied by using conventional techniques.
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Affiliation(s)
- Tatiana G Volova
- Siberian Federal University, 79 Svobodny pr., Krasnoyarsk, Russian Federation, 660041.
- Institute of Biophysics SB RAS, Federal Research Center "Krasnoyarsk Science Center SB RAS", Akademgorodok, Krasnoyarsk, Russian Federation, 660036.
| | - Svetlana V Prudnikova
- Siberian Federal University, 79 Svobodny pr., Krasnoyarsk, Russian Federation, 660041
| | - Natalia O Zhila
- Siberian Federal University, 79 Svobodny pr., Krasnoyarsk, Russian Federation, 660041
- Institute of Biophysics SB RAS, Federal Research Center "Krasnoyarsk Science Center SB RAS", Akademgorodok, Krasnoyarsk, Russian Federation, 660036
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242
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Wang C, He X, Wang X, Zhang S, Guo X. ghr-miR5272a-mediated regulation of GhMKK6 gene transcription contributes to the immune response in cotton. J Exp Bot 2017; 68:5895-5906. [PMID: 29069454 PMCID: PMC5854127 DOI: 10.1093/jxb/erx373] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/06/2017] [Accepted: 09/28/2017] [Indexed: 05/20/2023]
Abstract
Fusarium wilt is a major biotic stress affecting the productivity of cotton (Gossypium hirsutum). Although mitogen-activated protein kinase (MAPK) cascades play critical roles in plant disease resistance, their intricate regulation under fungal stress remains unclear, especially with regards to microRNA-mediated regulation of MAPK gene expression. In this study, we report that the MAPK kinase gene GhMKK6 and ghr-miR5272a work together in cotton resistance to Fusarium wilt. Silencing GhMKK6 in cotton decreased resistance to F. oxysporum by repressing the expression of known disease-resistance genes. Furthermore, although GhMKK6 played a positive role in disease resistance, excessive GhMKK6 activation caused an excessive hypersensitive response. ghr-miR5272a, a major regulator, prevents this excessive response by regulating GhMKK6 expression. ghr-miR5272a targets the GhMKK6 3'-untranslated region in cotton. Overexpressing miR5272a decreased the expression of GhMKK6 and disease-resistance genes, and increased sensitivity to F. oxysporum, yielding a similar phenotype to GhMKK6-silenced cotton. Overall, these results demonstrate that the ghr-miR5272a-mediated regulation of GhMKK6 expression contributes to the immune response in cotton, and reveal a new feedback loop mechanism in plant disease response.
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Affiliation(s)
- Chen Wang
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, PR China
| | - Xiaowen He
- State Key Laboratory of Crop Biology, Shandong Agricultural University, PR China
| | - Xinxin Wang
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, PR China
| | - Shuxin Zhang
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, PR China
| | - Xingqi Guo
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, PR China
- Correspondence:
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243
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Powell JJ, Carere J, Sablok G, Fitzgerald TL, Stiller J, Colgrave ML, Gardiner DM, Manners JM, Vogel JP, Henry RJ, Kazan K. Transcriptome analysis of Brachypodium during fungal pathogen infection reveals both shared and distinct defense responses with wheat. Sci Rep 2017; 7:17212. [PMID: 29222453 PMCID: PMC5722949 DOI: 10.1038/s41598-017-17454-3] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2017] [Accepted: 11/26/2017] [Indexed: 11/09/2022] Open
Abstract
Fusarium crown rot (FCR) of wheat and barley, predominantly caused by the fungal pathogen Fusarium pseudograminearum, is a disease of economic significance. The quantitative nature of FCR resistance within cultivated wheat germplasm has significantly limited breeding efforts to enhanced FCR resistance in wheat. In this study, we characterized the molecular responses of Brachypodium distachyon (Brachypodium hereafter) to F. pseudograminearum infection using RNA-seq to determine whether Brachypodium can be exploited as a model system towards better understanding of F. pseudograminearum-wheat interaction. The transcriptional response to infection in Brachypodium was strikingly similar to that previously reported in wheat, both in shared expression patterns of wheat homologs of Brachypodium genes and functional overlap revealed through comparative gene ontology analysis in both species. Metabolites produced by various biosynthetic pathways induced in both wheat and Brachypodium were quantified, revealing a high degree of overlap between these two species in metabolic response to infection but also showed Brachypodium does not produce certain defence-related metabolites found in wheat. Functional analyses of candidate genes identified in this study will improve our understanding of resistance mechanisms and may lead to the development of new strategies to protect cereal crops from pathogen infection.
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Affiliation(s)
- Jonathan J Powell
- Commonwealth Scientific and Industrial Research Organization Agriculture and Food, St Lucia, Queensland, 4067, Australia.
- Queensland Alliance for Agriculture and Food Innovation (QAAFI), University of Queensland, St Lucia, 4067, Queensland, Australia.
| | - Jason Carere
- Commonwealth Scientific and Industrial Research Organization Agriculture and Food, St Lucia, Queensland, 4067, Australia
| | - Gaurav Sablok
- Plant Functional Biology and Climate Change Cluster (C3), University of Technology Sydney, PO Box 123, Broadway, NSW 2007, Sydney, Australia
| | - Timothy L Fitzgerald
- Commonwealth Scientific and Industrial Research Organization Agriculture and Food, St Lucia, Queensland, 4067, Australia
| | - Jiri Stiller
- Commonwealth Scientific and Industrial Research Organization Agriculture and Food, St Lucia, Queensland, 4067, Australia
| | - Michelle L Colgrave
- Commonwealth Scientific and Industrial Research Organization Agriculture and Food, St Lucia, Queensland, 4067, Australia
| | - Donald M Gardiner
- Commonwealth Scientific and Industrial Research Organization Agriculture and Food, St Lucia, Queensland, 4067, Australia
| | - John M Manners
- Commonwealth Scientific and Industrial Research Organization Agriculture and Food, Black Mountain, Australian Capital Territory, 2601, Australia
| | - John P Vogel
- Joint Genome Institute, United States Department of Energy, Walnut Creek, CA, 94598, USA
| | - Robert J Henry
- Queensland Alliance for Agriculture and Food Innovation (QAAFI), University of Queensland, St Lucia, 4067, Queensland, Australia
| | - Kemal Kazan
- Commonwealth Scientific and Industrial Research Organization Agriculture and Food, St Lucia, Queensland, 4067, Australia.
- Queensland Alliance for Agriculture and Food Innovation (QAAFI), University of Queensland, St Lucia, 4067, Queensland, Australia.
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244
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Gorczyca A, Oleksy A, Gala-Czekaj D, Urbaniak M, Laskowska M, Waśkiewicz A, Stępień Ł. Fusarium head blight incidence and mycotoxin accumulation in three durum wheat cultivars in relation to sowing date and density. Naturwissenschaften 2017; 105:2. [PMID: 29209889 PMCID: PMC5717115 DOI: 10.1007/s00114-017-1528-7] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/20/2017] [Revised: 11/24/2017] [Accepted: 11/27/2017] [Indexed: 11/22/2022]
Abstract
Durum wheat (Triticum turgidum var. durum) is an important crop in Europe, particularly in the Mediterranean countries. Fusarium head blight (FHB) is considered as one of the most damaging diseases, resulting in yield and quality reduction as well as contamination of grain with mycotoxins. Three winter durum wheat cultivars originating from Austria, Slovakia, and Poland were analyzed during 2012-2014 seasons for FHB incidence and Fusarium mycotoxin accumulation in harvested grain. Moreover, the effects of sowing density and delayed sowing date were evaluated in the climatic conditions of Southern Poland. Low disease severity was observed in 2011/2012 in all durum wheat cultivars analyzed, and high FHB occurrence was recorded in 2012/2013 and 2013/2014 seasons. Fusarium graminearum was the most abundant pathogen, followed by Fusarium avenaceum. Through all three seasons, cultivar Komnata was the most susceptible to FHB and to mycotoxin accumulation, while cultivars Auradur and IS Pentadur showed less symptoms. High susceptibility of cv. Komnata was reflected by the number of Fusarium isolates and elevated mycotoxin (deoxynivalenol, zearalenone, and moniliformin) content in the grain of this cultivar across all three seasons. Nivalenol was identified in the samples of cv. Komnata only. Genotype-dependent differences in FHB susceptibility were observed for the plants sown at optimal date but not at delayed sowing date. It can be hypothesized that cultivars bred in Austria and Slovakia show less susceptibility towards FHB than the cultivar from Poland because of the environmental conditions allowing for more efficient selection of breeding materials.
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Affiliation(s)
- Anna Gorczyca
- Department of Agricultural Environment Protection, Agricultural University in Kraków, Mickiewicza 21, 31-120, Kraków, Poland
| | - Andrzej Oleksy
- Institute of Plant Production, Agricultural University in Kraków, Mickiewicza 21, 31-120, Kraków, Poland
| | - Dorota Gala-Czekaj
- Department of Agrotechnology and Agricultural Ecology, Agricultural University in Kraków, Mickiewicza 21, 31-120, Kraków, Poland
| | - Monika Urbaniak
- Department of Pathogen Genetics and Plant Resistance, Institute of Plant Genetics, Polish Academy of Sciences, Strzeszyńska 34, 60-479, Poznań, Poland
| | - Magdalena Laskowska
- Department of Chemistry, Poznań University of Life Sciences, Wojska Polskiego 75, 60-625, Poznań, Poland
| | - Agnieszka Waśkiewicz
- Department of Chemistry, Poznań University of Life Sciences, Wojska Polskiego 75, 60-625, Poznań, Poland
| | - Łukasz Stępień
- Department of Pathogen Genetics and Plant Resistance, Institute of Plant Genetics, Polish Academy of Sciences, Strzeszyńska 34, 60-479, Poznań, Poland.
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245
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Knight NL, Sutherland MW. Assessment of Fusarium pseudograminearum and F. culmorum Biomass in Seedlings of Potential Host Cereal Species. Plant Dis 2017; 101:2116-2122. [PMID: 30677367 DOI: 10.1094/pdis-12-16-1739-re] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Fusarium crown rot is a major disease of wheat and barley worldwide, with the most frequently isolated causal agents being Fusarium pseudograminearum and F. culmorum. This study has successfully designed a quantitative polymerase chain reaction assay that is specific for F. culmorum, which has been used in conjunction with a previously established F. pseudograminearum-specific assay to compare the location and extent of infection by each fungus across a range of potential hosts, including six winter and three summer cereal species. All common winter cereals, excluding oat, demonstrated a similar range of visual and fungal biomass results when inoculated with either F. pseudograminearum or F. culmorum. Oat exhibited the lowest visual disease ratings and fungal biomass values of the winter cereals, while the sorghum, maize, and rice cultivars returned the lowest values overall. The ranking of host species according to visual discoloration was strongly correlated for both pathogens. Visual reactions to F. pseudograminearum were greater than those caused by F. culmorum in all potential hosts trialed; however, fungal biomass results only indicated this trend for barley. These results demonstrate significant variation in the ability of these pathogens to colonize the range of cereal species examined and also suggest differences between the pathogens in their patterns of host colonization.
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Affiliation(s)
- Noel L Knight
- Centre for Crop Health, Faculty of Health, Engineering and Sciences, University of Southern Queensland, Toowoomba, Queensland, 4350, Australia
| | - Mark W Sutherland
- Centre for Crop Health, Faculty of Health, Engineering and Sciences, University of Southern Queensland, Toowoomba, Queensland, 4350, Australia
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246
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Wang R, Chen J, Anderson JA, Zhang J, Zhao W, Wheeler J, Klassen N, See DR, Dong Y. Genome-Wide Association Mapping of Fusarium Head Blight Resistance in Spring Wheat Lines Developed in the Pacific Northwest and CIMMYT. Phytopathology 2017; 107:1486-1495. [PMID: 28703042 DOI: 10.1094/phyto-02-17-0073-r] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Fusarium head blight (FHB) is a destructive disease of wheat in humid and semihumid areas of the world. It has emerged in the Pacific Northwest (PNW) in recent years because of changing climate and crop rotation practices. Our objectives in the present study were to identify and characterize quantitative trait loci (QTL) associated with FHB resistance in spring wheat lines developed in the PNW and the International Maize and Wheat Improvement Center. In total, 170 spring wheat lines were evaluated in field and greenhouse trials in 2015 and 2016. Fourteen lines showing consistent resistance in multiple environments were identified. These lines are valuable resources in wheat variety improvement of FHB resistance because they have no Sumai 3 or Sumai 3-related background. The 170 lines were genotyped using a high-density Illumina 90K single-nucleotide polymorphisms (SNP) assay and 10 other non-SNP markers. A genome-wide association analysis was conducted with a mixed model (Q+K). Consistent, significant SNP associations with multiple traits were found on chromosomes 1B, 2B, 4B, 5A, 5B, and 6A. The locus on chromosome 5B for reduced deoxynivalenol content may be novel. The identified QTL are being validated in additional mapping studies and the identified resistant lines are being used in variety development for FHB resistance and facilitated by marker-assisted selection.
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Affiliation(s)
- Rui Wang
- First, second, fifth, sixth, and seventh authors: Department of Plant, Soil, and Entomological Sciences, University of Idaho, Aberdeen; third author: Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul; fourth author: Department of Plant Sciences, University of California-Davis, Davis; eighth author: United States Department of Agriculture-Agricultural Research Service, Wheat Genetics, Quality, Physiology and Disease Research Unit, Pullman, WA 99164; and ninth author: Department of Plant Pathology, University of Minnesota, St. Paul
| | - Jianli Chen
- First, second, fifth, sixth, and seventh authors: Department of Plant, Soil, and Entomological Sciences, University of Idaho, Aberdeen; third author: Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul; fourth author: Department of Plant Sciences, University of California-Davis, Davis; eighth author: United States Department of Agriculture-Agricultural Research Service, Wheat Genetics, Quality, Physiology and Disease Research Unit, Pullman, WA 99164; and ninth author: Department of Plant Pathology, University of Minnesota, St. Paul
| | - James A Anderson
- First, second, fifth, sixth, and seventh authors: Department of Plant, Soil, and Entomological Sciences, University of Idaho, Aberdeen; third author: Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul; fourth author: Department of Plant Sciences, University of California-Davis, Davis; eighth author: United States Department of Agriculture-Agricultural Research Service, Wheat Genetics, Quality, Physiology and Disease Research Unit, Pullman, WA 99164; and ninth author: Department of Plant Pathology, University of Minnesota, St. Paul
| | - Junli Zhang
- First, second, fifth, sixth, and seventh authors: Department of Plant, Soil, and Entomological Sciences, University of Idaho, Aberdeen; third author: Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul; fourth author: Department of Plant Sciences, University of California-Davis, Davis; eighth author: United States Department of Agriculture-Agricultural Research Service, Wheat Genetics, Quality, Physiology and Disease Research Unit, Pullman, WA 99164; and ninth author: Department of Plant Pathology, University of Minnesota, St. Paul
| | - Weidong Zhao
- First, second, fifth, sixth, and seventh authors: Department of Plant, Soil, and Entomological Sciences, University of Idaho, Aberdeen; third author: Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul; fourth author: Department of Plant Sciences, University of California-Davis, Davis; eighth author: United States Department of Agriculture-Agricultural Research Service, Wheat Genetics, Quality, Physiology and Disease Research Unit, Pullman, WA 99164; and ninth author: Department of Plant Pathology, University of Minnesota, St. Paul
| | - Justin Wheeler
- First, second, fifth, sixth, and seventh authors: Department of Plant, Soil, and Entomological Sciences, University of Idaho, Aberdeen; third author: Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul; fourth author: Department of Plant Sciences, University of California-Davis, Davis; eighth author: United States Department of Agriculture-Agricultural Research Service, Wheat Genetics, Quality, Physiology and Disease Research Unit, Pullman, WA 99164; and ninth author: Department of Plant Pathology, University of Minnesota, St. Paul
| | - Natalie Klassen
- First, second, fifth, sixth, and seventh authors: Department of Plant, Soil, and Entomological Sciences, University of Idaho, Aberdeen; third author: Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul; fourth author: Department of Plant Sciences, University of California-Davis, Davis; eighth author: United States Department of Agriculture-Agricultural Research Service, Wheat Genetics, Quality, Physiology and Disease Research Unit, Pullman, WA 99164; and ninth author: Department of Plant Pathology, University of Minnesota, St. Paul
| | - Deven R See
- First, second, fifth, sixth, and seventh authors: Department of Plant, Soil, and Entomological Sciences, University of Idaho, Aberdeen; third author: Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul; fourth author: Department of Plant Sciences, University of California-Davis, Davis; eighth author: United States Department of Agriculture-Agricultural Research Service, Wheat Genetics, Quality, Physiology and Disease Research Unit, Pullman, WA 99164; and ninth author: Department of Plant Pathology, University of Minnesota, St. Paul
| | - Yanhong Dong
- First, second, fifth, sixth, and seventh authors: Department of Plant, Soil, and Entomological Sciences, University of Idaho, Aberdeen; third author: Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul; fourth author: Department of Plant Sciences, University of California-Davis, Davis; eighth author: United States Department of Agriculture-Agricultural Research Service, Wheat Genetics, Quality, Physiology and Disease Research Unit, Pullman, WA 99164; and ninth author: Department of Plant Pathology, University of Minnesota, St. Paul
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Li C, Yang J, Li W, Sun J, Peng M. Direct Root Penetration and Rhizome Vascular Colonization by Fusarium oxysporum f. sp. cubense are the Key Steps in the Successful Infection of Brazil Cavendish. Plant Dis 2017; 101:2073-2078. [PMID: 30677384 DOI: 10.1094/pdis-04-17-0467-re] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Fusarium wilt of banana, which is caused by Fusarium oxysporum f. sp. cubense, is one of the most serious diseases of banana. F. oxysporum f. sp. cubense race 1 (Foc1) and race 4 (Foc4) are the most prevalent pathogens of banana cultivars in the world. To understand the differences in the infection processes between Foc1 and Foc4, green fluorescent protein-tagged strains of F. oxysporum f. sp. cubense tropical race 4 (FocTR4) and Foc1 were used to inoculate 'Brazil Cavendish' banana. At 2 days postinoculation (dpi), it was observed that the spores and hyphae of both Foc1 and Foc4 attached to the root hairs and root epidermis. At 3 dpi, the hyphae of both Foc1 and Foc4 were found in the vascular tissues of roots. However, Foc4 was observed in the parenchymal cells of banana root, whereas Foc1 was not found in parenchymal cells at 7 dpi. Furthermore, few Foc1 hyphae were observed in a few xylems whereas many more Foc4 hyphae were present in many xylems and phloems. Foc4 was observed in the vascular tissues of banana rhizomes, whereas no Foc1 was found in rhizomes 2 months after inoculation. The attachment process in F. oxysporum f. sp. cubense infection was further studied with scanning electron microscopy. Foc4 was observed to penetrate into banana roots from the intercellular space of the epidermis and wounds, whereas Foc1 mainly penetrated from the wounds but not from the intercellular space of the epidermis. Therefore, direct root penetration and rhizome vascular colonization by F. oxysporum f. sp. cubense are the key steps in the successful infection of Brazil Cavendish.
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Affiliation(s)
- Chunqiang Li
- Hainan University, Haikou, China; Institute of Tropical Bioscience and Biotechnology, Chinese Academy of Tropical Agricultural Sciences, Haikou, China; and Key Laboratory of Biology and Genetic Resources of Tropical Crops, Ministry of Agriculture, China
| | - Jinghao Yang
- Institute of Tropical Bioscience and Biotechnology, Chinese Academy of Tropical Agricultural Sciences and Key Laboratory of Biology and Genetic Resources of Tropical Crops, Ministry of Agriculture
| | - Wenbin Li
- Institute of Tropical Bioscience and Biotechnology, Chinese Academy of Tropical Agricultural Sciences and Key Laboratory of Biology and Genetic Resources of Tropical Crops, Ministry of Agriculture
| | - Jianbo Sun
- Institute of Tropical Bioscience and Biotechnology, Chinese Academy of Tropical Agricultural Sciences and Key Laboratory of Biology and Genetic Resources of Tropical Crops, Ministry of Agriculture
| | - Ming Peng
- Institute of Tropical Bioscience and Biotechnology, Chinese Academy of Tropical Agricultural Sciences and Key Laboratory of Biology and Genetic Resources of Tropical Crops, Ministry of Agriculture
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248
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Pastrana AM, Kirkpatrick SC, Kong M, Broome JC, Gordon TR. Fusarium oxysporum f. sp. mori, a New Forma Specialis Causing Fusarium Wilt of Blackberry. Plant Dis 2017; 101:2066-2072. [PMID: 30677374 DOI: 10.1094/pdis-03-17-0428-re] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Fusarium oxysporum has recently been identified as the cause of a wilt disease affecting blackberry in California and Mexico. Thirty-six isolates of F. oxysporum obtained from symptomatic blackberry plants in California and Mexico were comprised of nine distinct somatic compatibility groups (SCGs). Phylogenetic analysis of a concatenated data set, consisting of sequences of the translation elongation factor 1-α and β-tubulin genes and the intergenic spacer of the ribosomal DNA, identified nine three-locus sequence types, each of which corresponded to an SCG. Six SCGs were present only in California, two only in Mexico, and one in both California and Mexico. An isolate associated with the most common SCG in California was tested for pathogenicity on blueberry, raspberry, strawberry, and lettuce. All blueberry, raspberry, and lettuce plants that were inoculated remained healthy, but two of the five strawberry cultivars tested developed symptoms. The three strawberry cultivars that were resistant to the blackberry pathogen were also resistant to F. oxysporum f. sp. fragariae, the cause of Fusarium wilt of strawberry. We propose to designate strains of F. oxysporum that are pathogenic to blackberry as Fusarium oxysporum f. sp. mori forma specialis nov.
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Affiliation(s)
- A M Pastrana
- Department of Plant Pathology, University of California, Davis 95616
| | - S C Kirkpatrick
- Department of Plant Pathology, University of California, Davis 95616
| | - M Kong
- Driscoll's Inc., Watsonville, CA 95076
| | | | - T R Gordon
- Department of Plant Pathology, University of California, Davis 95616
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249
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Dastogeer KMG, Li H, Sivasithamparam K, Jones MGK, Wylie SJ. A simple and rapid in vitro test for large-scale screening of fungal endophytes from drought-adapted Australian wild plants for conferring water deprivation tolerance and growth promotion in Nicotiana benthamiana seedlings. Arch Microbiol 2017; 199:1357-1370. [PMID: 28733885 DOI: 10.1007/s00203-017-1411-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2016] [Revised: 06/13/2017] [Accepted: 07/14/2017] [Indexed: 10/19/2022]
Abstract
Some fungal endophytes confer novel phenotypes and enhance existing ones in plants, including tolerance to water deprivation stress. A range of fungal endophytes was isolated from wild Nicotiana plants growing in arid parts of northern Australia. These were screened for ability to enhance water deprivation stress tolerance by inoculating seedlings of the model plant N. benthamiana in two in vitro tests. Sixty-eight endophyte isolates were co-cultivated with N. benthamiana seedlings on either damp filter paper or on agar medium before being subjected to water deprivation. Seventeen isolates were selected for further testing under water deprivation conditions in a sand-based test in a glasshouse. Only two fungal isolates, Cladosporium cladosporioides (E-162) and an unknown fungus (E-284), significantly enhanced seedling tolerance to moisture deprivation consistently in both in vitro and sand-based tests. Although a strongly significant correlation was observed between any two screening methods, the result of filter paper test was more strongly reflected (r = 0.757, p < 0.001) in results of the glasshouse test, indicating its relative suitability over the agar-based test. In another experiment, the same 17 isolates carried forward to the sand-based test used in the glasshouse screening test were inoculated to N. benthamiana plants in pots in a nutrient-limiting environment to test their influence on growth promotion. Isolates related to C. cladosporioides, Fusarium equiseti, and Thozetella sp. promoted seedling growth by increasing shoot length and biomass. The fungal isolate E-162 (C. cladosporioides) significantly enhanced moisture deprivation tolerance as well as promoted seedling growth.
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Affiliation(s)
- Khondoker M G Dastogeer
- Plant Biotechnology Group, Plant Virology, Western Australian State Agricultural Biotechnology Centre, School of Veterinary and Life Sciences, Murdoch University, Perth, WA, 6150, Australia
- Department of Plant Pathology, Bangladesh Agricultural University, Mymensingh, 2202, Bangladesh
| | - Hua Li
- Plant Biotechnology Group, Plant Virology, Western Australian State Agricultural Biotechnology Centre, School of Veterinary and Life Sciences, Murdoch University, Perth, WA, 6150, Australia
| | - Krishnapillai Sivasithamparam
- Plant Biotechnology Group, Plant Virology, Western Australian State Agricultural Biotechnology Centre, School of Veterinary and Life Sciences, Murdoch University, Perth, WA, 6150, Australia
| | - Michael G K Jones
- Plant Biotechnology Group, Plant Virology, Western Australian State Agricultural Biotechnology Centre, School of Veterinary and Life Sciences, Murdoch University, Perth, WA, 6150, Australia
| | - Stephen J Wylie
- Plant Biotechnology Group, Plant Virology, Western Australian State Agricultural Biotechnology Centre, School of Veterinary and Life Sciences, Murdoch University, Perth, WA, 6150, Australia.
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250
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Miyaji N, Shimizu M, Miyazaki J, Osabe K, Sato M, Ebe Y, Takada S, Kaji M, Dennis ES, Fujimoto R, Okazaki K. Comparison of transcriptome profiles by Fusarium oxysporum inoculation between Fusarium yellows resistant and susceptible lines in Brassica rapa L. Plant Cell Rep 2017; 36:1841-1854. [PMID: 28819684 DOI: 10.1007/s00299-017-2198-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/12/2017] [Accepted: 08/07/2017] [Indexed: 05/25/2023]
Abstract
Resistant and susceptible lines in Brassica rapa have different immune responses against Fusarium oxysporum inoculation. Fusarium yellows caused by Fusarium oxysporum f. sp. conglutinans (Foc) is an important disease of Brassicaceae; however, the mechanism of how host plants respond to Foc is still unknown. By comparing with and without Foc inoculation in both resistant and susceptible lines of Chinese cabbage (Brassica rapa var. pekinensis), we identified differentially expressed genes (DEGs) between the bulked inoculated (6, 12, 24, and 72 h after inoculation (HAI)) and non-inoculated samples. Most of the DEGs were up-regulated by Foc inoculation. Quantitative real-time RT-PCR showed that most up-regulated genes increased their expression levels from 24 HAI. An independent transcriptome analysis at 24 and 72 HAI was performed in resistant and susceptible lines. GO analysis using up-regulated genes at 24 HAI indicated that Foc inoculation activated systemic acquired resistance (SAR) in resistant lines and tryptophan biosynthetic process and responses to chitin and ethylene in susceptible lines. By contrast, GO analysis using up-regulated genes at 72 HAI showed the overrepresentation of some categories for the defense response in susceptible lines but not in the resistant lines. We also compared DEGs between B. rapa and Arabidopsis thaliana after F. oxysporum inoculation at the same time point, and identified genes related to defense response that were up-regulated in the resistant lines of Chinese cabbage and A. thaliana. Particular genes that changed expression levels overlapped between the two species, suggesting that they are candidates for genes involved in the resistance mechanisms against F. oxysporum.
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Affiliation(s)
- Naomi Miyaji
- Graduate School of Agricultural Science, Kobe University, Rokkodai, Nada-ku, Kobe, 657-8501, Japan
| | - Motoki Shimizu
- Iwate Biotechnology Research Center, Narita, Kitakami, Iwate, 024-0003, Japan
| | - Junji Miyazaki
- Department of Animal, Plant and Soil Sciences, Centre for AgriBioscience, La Trobe University, Bundoora, VIC, 3086, Australia
| | - Kenji Osabe
- Plant Epigenetics Unit, Okinawa Institute of Science and Technology Graduate University, Onna-Son, Okinawa, 904-0495, Japan
| | - Maho Sato
- Graduate School of Science and Technology, Niigata University, Ikarashi-ninocho, Niigata, 950-2181, Japan
| | - Yusuke Ebe
- Graduate School of Science and Technology, Niigata University, Ikarashi-ninocho, Niigata, 950-2181, Japan
| | - Satoko Takada
- Graduate School of Agricultural Science, Kobe University, Rokkodai, Nada-ku, Kobe, 657-8501, Japan
| | - Makoto Kaji
- Watanabe seed Co., Ltd, Machiyashiki, Misato-Cho, Miyagi, 987-8607, Japan
| | | | - Ryo Fujimoto
- Graduate School of Agricultural Science, Kobe University, Rokkodai, Nada-ku, Kobe, 657-8501, Japan.
| | - Keiichi Okazaki
- Graduate School of Science and Technology, Niigata University, Ikarashi-ninocho, Niigata, 950-2181, Japan
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