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García-Gaona M, Romero HM. Infection of Phytophthora palmivora Isolates on Arabidopsis thaliana. J Fungi (Basel) 2024; 10:446. [PMID: 39057331 PMCID: PMC11277810 DOI: 10.3390/jof10070446] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2024] [Revised: 06/13/2024] [Accepted: 06/21/2024] [Indexed: 07/28/2024] Open
Abstract
Phytophthora palmivora, a hemibiotrophic oomycete, causes diseases in several economically important tropical crops, such as oil palm, which it is responsible for a devastating disease called bud rot (BR). Despite recent progress in understanding host resistance and virulence mechanisms, many aspects remain unknown in P. palmivora isolates from oil palm. Model pathosystems are useful for understanding the molecular interactions between pathogens and hosts. In this study, we utilized detached leaves and whole seedlings of Arabidopsis thaliana Col-0 to describe and evaluate the infection process of three P. palmivora isolates (CPPhZC-05, CPPhZC-04, CPPhZOC-01) that cause BR in oil palm. Two compatible isolates (CPPhZC-05 and CPPhZOC-01) induced aqueous lesions at 72 h post-inoculation (hpi), with microscopic visualization revealing zoospore encysting and appressorium penetration at 3 hpi, followed by sporangia generation at 72 hpi. In contrast, an incompatible isolate (CPPhZC-04) exhibited cysts that could not penetrate tissue, resulting in low leaf colonization. Gene expression of ten P. palmivora infection-related genes was quantified by RT-qPCR, revealing overexpression in compatible isolates, but not in the incompatible isolate. Additionally, key genes associated with salicylic acid (SA), jasmonic acid (JA), and ethylene (ET) in Arabidopsis exhibited regulation during interaction with the three isolates. These findings demonstrate that P. palmivora can infect Arabidopsis Col-0, and variability is observed in the interaction between Arabidopsis-Col-0 and P. palmivora isolates. Establishing this pathosystem is expected to enhance our understanding of P. palmivora's pathology and physiology.
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Affiliation(s)
- Mariandrea García-Gaona
- Biology and Breeding Research Program, Colombian Oil Palm Research Center, Cenipalma, Calle 98 No. 70-91, Piso 14, Bogota 111121, Colombia;
| | - Hernán Mauricio Romero
- Biology and Breeding Research Program, Colombian Oil Palm Research Center, Cenipalma, Calle 98 No. 70-91, Piso 14, Bogota 111121, Colombia;
- Department of Biology, Universidad Nacional de Colombia, Bogota 111321, Colombia
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2
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Testi S, Kuhn ML, Allasia V, Auroy P, Kong F, Peltier G, Pagnotta S, Cazareth J, Keller H, Panabières F. The Phytophthora parasitica effector AVH195 interacts with ATG8, attenuates host autophagy, and promotes biotrophic infection. BMC Biol 2024; 22:100. [PMID: 38679707 PMCID: PMC11057187 DOI: 10.1186/s12915-024-01899-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2024] [Accepted: 04/22/2024] [Indexed: 05/01/2024] Open
Abstract
BACKGROUND Plant pathogens secrete effector proteins into host cells to suppress immune responses and manipulate fundamental cellular processes. One of these processes is autophagy, an essential recycling mechanism in eukaryotic cells that coordinates the turnover of cellular components and contributes to the decision on cell death or survival. RESULTS We report the characterization of AVH195, an effector from the broad-spectrum oomycete plant pathogen, Phytophthora parasitica. We show that P. parasitica expresses AVH195 during the biotrophic phase of plant infection, i.e., the initial phase in which host cells are maintained alive. In tobacco, the effector prevents the initiation of cell death, which is caused by two pathogen-derived effectors and the proapoptotic BAX protein. AVH195 associates with the plant vacuolar membrane system and interacts with Autophagy-related protein 8 (ATG8) isoforms/paralogs. When expressed in cells from the green alga, Chlamydomonas reinhardtii, the effector delays vacuolar fusion and cargo turnover upon stimulation of autophagy, but does not affect algal viability. In Arabidopsis thaliana, AVH195 delays the turnover of ATG8 from endomembranes and promotes plant susceptibility to P. parasitica and the obligate biotrophic oomycete pathogen Hyaloperonospora arabidopsidis. CONCLUSIONS Taken together, our observations suggest that AVH195 targets ATG8 to attenuate autophagy and prevent associated host cell death, thereby favoring biotrophy during the early stages of the infection process.
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Affiliation(s)
- Serena Testi
- Université Côte d'Azur, INRAE, CNRS, Institut Sophia Agrobiotech, 06903, Sophia Antipolis, France
- Present Address: Station Biologique de Roscoff, UMR8227 LBI2M, CNRS-Sorbonne Unversité, 29680, Roscoff, France
| | - Marie-Line Kuhn
- Université Côte d'Azur, INRAE, CNRS, Institut Sophia Agrobiotech, 06903, Sophia Antipolis, France
| | - Valérie Allasia
- Université Côte d'Azur, INRAE, CNRS, Institut Sophia Agrobiotech, 06903, Sophia Antipolis, France
| | - Pascaline Auroy
- Aix Marseille Université, CEA, CNRS, Institut de Biosciences et Biotechnologies Aix-Marseille, CEA Cadarache, 13108, Saint Paul-Lez-Durance, France
| | - Fantao Kong
- Aix Marseille Université, CEA, CNRS, Institut de Biosciences et Biotechnologies Aix-Marseille, CEA Cadarache, 13108, Saint Paul-Lez-Durance, France
- Present address: School of Bioengineering, Dalian University of Technology, Dalian, 116024, China
| | - Gilles Peltier
- Aix Marseille Université, CEA, CNRS, Institut de Biosciences et Biotechnologies Aix-Marseille, CEA Cadarache, 13108, Saint Paul-Lez-Durance, France
| | - Sophie Pagnotta
- Université Côte d'Azur, Centre Commun de Microscopie Appliquée, 06108, Nice, France
| | - Julie Cazareth
- Université Côte d'Azur, CNRS, Institut de Pharmacologie Moléculaire et Cellulaire, 06903, Sophia Antipolis, France
| | - Harald Keller
- Université Côte d'Azur, INRAE, CNRS, Institut Sophia Agrobiotech, 06903, Sophia Antipolis, France.
| | - Franck Panabières
- Université Côte d'Azur, INRAE, CNRS, Institut Sophia Agrobiotech, 06903, Sophia Antipolis, France
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Shirai M, Eulgem T. Molecular interactions between the soilborne pathogenic fungus Macrophomina phaseolina and its host plants. FRONTIERS IN PLANT SCIENCE 2023; 14:1264569. [PMID: 37780504 PMCID: PMC10539690 DOI: 10.3389/fpls.2023.1264569] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/21/2023] [Accepted: 08/28/2023] [Indexed: 10/03/2023]
Abstract
Mentioned for the first time in an article 1971, the occurrence of the term "Macrophomina phaseolina" has experienced a steep increase in the scientific literature over the past 15 years. Concurrently, incidences of M. phaseolina-caused crop diseases have been getting more frequent. The high levels of diversity and plasticity observed for M. phasolina genomes along with a rich equipment of plant cell wall degrading enzymes, secondary metabolites and putative virulence effectors as well as the unusual longevity of microsclerotia, their asexual reproduction structures, make this pathogen very difficult to control and crop protection against it very challenging. During the past years several studies have emerged reporting on host defense measures against M. phaseolina, as well as mechanisms of pathogenicity employed by this fungal pathogen. While most of these studies have been performed in crop systems, such as soybean or sesame, recently interactions of M. phaseolina with the model plant Arabidopsis thaliana have been described. Collectively, results from various studies are hinting at a complex infection cycle of M. phaseolina, which exhibits an early biotrophic phase and switches to necrotrophy at later time points during the infection process. Consequently, responses of the hosts are complex and seem coordinated by multiple defense-associated phytohormones. However, at this point no robust and strong host defense mechanism against M. phaseolina has been described.
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Affiliation(s)
| | - Thomas Eulgem
- Center for Plant Cell Biology, Institute for Integrative Genome Biology, Department of Botany & Plant Sciences, University of California at Riverside, Riverside, CA, United States
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Nguyen TNH, Leclerc L, Manzanares-Dauleux MJ, Gravot A, Vicré M, Morvan-Bertrand A, Prud'homme MP. Fructan exohydrolases (FEHs) are upregulated by salicylic acid together with defense-related genes in non-fructan accumulating plants. PHYSIOLOGIA PLANTARUM 2023; 175:e13975. [PMID: 37616010 DOI: 10.1111/ppl.13975] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2023] [Revised: 06/05/2023] [Accepted: 07/04/2023] [Indexed: 08/25/2023]
Abstract
The identification of several fructan exohydrolases (FEHs, EC 3.2.1.80) in non-fructan accumulating plants raised the question of their roles. FEHs may be defense-related proteins involved in the interactions with fructan-accumulating microorganisms. Since known defense-related proteins are upregulated by defense-related phytohormones, we tested the hypothesis that FEHs of non-fructan accumulating plants are upregulated by salicylic acid (SA), jasmonic acid (JA) and ethylene (ET) using the model plant Arabidopsis thaliana and the agronomically relevant and genetically related species Brassica napus. By sequence homologies with the two known FEH genes of A. thaliana, At6-FEH, and At6&1-FEH, the genes coding for the putative B. napus FEHs, Bn6-FEH and Bn6&1-FEH, were identified. Plants were treated at root level with SA, methyl jasmonate (MeJA) or 1-aminocyclopropane-1-carboxylic acid (ACC). The transcript levels of defense-related and FEH genes were measured after treatments. MeJA and ACC did not upregulate FEHs, while HEL (HEVEIN-LIKE PREPROTEIN) expression was enhanced by both phytohormones. In both species, the expression of AOS, encoding a JA biosynthesis enzyme, was enhanced by MeJA and that of the defensine PDF1.2 and the ET signaling transcription factor ERF1/2 by ACC. In contrast, SA not only increased the expression of genes encoding antimicrobial proteins (PR1 and HEL) and the defense-related transcription factor WRKY70 but also that of FEH genes, in particular 6&1-FEH genes. This result supports the putative role of FEHs as defense-related proteins. Genotypic variability of SA-mediated FEH regulation (transcript level and activities) was observed among five varieties of B. napus, suggesting different susceptibilities toward fructan-accumulating pathogens.
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Affiliation(s)
- Thi Ngoc Hanh Nguyen
- Normandie Université, UNICAEN, UMR 950 INRAE, EVA Ecophysiologie Végétale Agronomie et Nutritions N.C.S, SFR Normandie Végétale FED4277, Caen, France
- Normandie Université, Univ Rouen Normandie, Laboratoire Glyco-MEV EA 4358, SFR Normandie Végétale FED4277, Rouen, France
| | - Laëtitia Leclerc
- Normandie Université, UNICAEN, UMR 950 INRAE, EVA Ecophysiologie Végétale Agronomie et Nutritions N.C.S, SFR Normandie Végétale FED4277, Caen, France
| | | | - Antoine Gravot
- Institut Agro, Université Rennes, INRAE, IGEPP, Le Rheu, France
| | - Maïté Vicré
- Normandie Université, Univ Rouen Normandie, Laboratoire Glyco-MEV EA 4358, SFR Normandie Végétale FED4277, Rouen, France
| | - Annette Morvan-Bertrand
- Normandie Université, UNICAEN, UMR 950 INRAE, EVA Ecophysiologie Végétale Agronomie et Nutritions N.C.S, SFR Normandie Végétale FED4277, Caen, France
| | - Marie-Pascale Prud'homme
- Normandie Université, UNICAEN, UMR 950 INRAE, EVA Ecophysiologie Végétale Agronomie et Nutritions N.C.S, SFR Normandie Végétale FED4277, Caen, France
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Li J, Deng F, Wang H, Qiang X, Meng Y, Shan W. The Raf-like kinase Raf36 negatively regulates plant resistance against the oomycete pathogen Phytophthora parasitica by targeting MKK2. MOLECULAR PLANT PATHOLOGY 2022; 23:530-542. [PMID: 34935273 PMCID: PMC8916217 DOI: 10.1111/mpp.13176] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2021] [Revised: 11/15/2021] [Accepted: 12/05/2021] [Indexed: 05/16/2023]
Abstract
Oomycetes represent a unique group of plant pathogens that are phylogenetically distant from true fungi and cause significant crop losses and environmental damage. Understanding of the genetic basis of host plant susceptibility facilitates the development of novel disease resistance strategies. In this study, we report the identification of an Arabidopsis thaliana T-DNA mutant with enhanced resistance to Phytophthora parasitica with an insertion in the Raf-like mitogen-activated protein kinase kinase kinase gene Raf36. We generated additional raf36 mutants by CRISPR/Cas9 technology as well as Raf36 complementation and overexpression transformants, with consistent results of infection assays showing that Raf36 mediates Arabidopsis susceptibility to P. parasitica. Using a virus-induced gene silencing assay, we silenced Raf36 homologous genes in Nicotiana benthamiana and demonstrated by infection assays the conserved immune function of Raf36. Mutagenesis analyses indicated that the kinase activity of Raf36 is important for its immune function and interaction with MKK2, a MAPK kinase. By generating and analysing mkk2 mutants and MKK2 complementation and overexpression transformants, we found that MKK2 is a positive immune regulator in the response to P. parasitica infection. Furthermore, infection assay on mkk2 raf36 double mutant plants indicated that MKK2 is required for the raf36-conferred resistance to P. parasitica. Taken together, we identified a Raf-like kinase Raf36 as a novel plant susceptibility factor that functions upstream of MKK2 and directly targets it to negatively regulate plant resistance to P. parasitica.
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Affiliation(s)
- Jinfang Li
- College of Plant ProtectionNorthwest A&F UniversityYanglingChina
- State Key Laboratory of Crop Stress Biology for Arid AreasNorthwest A&F UniversityYanglingChina
| | - Fengyan Deng
- State Key Laboratory of Crop Stress Biology for Arid AreasNorthwest A&F UniversityYanglingChina
- College of Life SciencesNorthwest A&F UniversityYanglingChina
| | - Hongmei Wang
- State Key Laboratory of Crop Stress Biology for Arid AreasNorthwest A&F UniversityYanglingChina
- College of AgronomyNorthwest A&F UniversityYanglingChina
| | - Xiaoyu Qiang
- State Key Laboratory of Crop Stress Biology for Arid AreasNorthwest A&F UniversityYanglingChina
- College of AgronomyNorthwest A&F UniversityYanglingChina
| | - Yuling Meng
- State Key Laboratory of Crop Stress Biology for Arid AreasNorthwest A&F UniversityYanglingChina
- College of AgronomyNorthwest A&F UniversityYanglingChina
| | - Weixing Shan
- State Key Laboratory of Crop Stress Biology for Arid AreasNorthwest A&F UniversityYanglingChina
- College of AgronomyNorthwest A&F UniversityYanglingChina
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6
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Chickpea Roots Undergoing Colonisation by Phytophthora medicaginis Exhibit Opposing Jasmonic Acid and Salicylic Acid Accumulation and Signalling Profiles to Leaf Hemibiotrophic Models. Microorganisms 2022; 10:microorganisms10020343. [PMID: 35208798 PMCID: PMC8874544 DOI: 10.3390/microorganisms10020343] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Revised: 01/18/2022] [Accepted: 01/27/2022] [Indexed: 02/04/2023] Open
Abstract
Hemibiotrophic pathogens cause significant losses within agriculture, threatening the sustainability of food systems globally. These microbes colonise plant tissues in three phases: a biotrophic phase followed by a biotrophic-to-necrotrophic switch phase and ending with necrotrophy. Each of these phases is characterized by both common and discrete host transcriptional responses. Plant hormones play an important role in these phases, with foliar models showing that salicylic acid accumulates during the biotrophic phase and jasmonic acid/ethylene responses occur during the necrotrophic phase. The appropriateness of this model to plant roots has been challenged in recent years. The need to understand root responses to hemibiotrophic pathogens of agronomic importance necessitates further research. In this study, using the root hemibiotroph Phytophthora medicaginis, we define the duration of each phase of pathogenesis in Cicer arietinum (chickpea) roots. Using transcriptional profiling, we demonstrate that susceptible chickpea roots display some similarities in response to disease progression as previously documented in leaf plant–pathogen hemibiotrophic interactions. However, our transcriptomic results also show that chickpea roots do not conform to the phytohormone responses typically found in leaf colonisation by hemibiotrophs. We found that quantified levels of salicylic acid concentrations in root tissues decreased significantly during biotrophy while jasmonic acid concentrations were significantly induced. This study demonstrated that a wider spectrum of plant species should be investigated in the future to understand the physiological changes in plants during colonisation by soil-borne hemibiotrophic pathogens before we can better manage these economically important microbes.
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7
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The Same against Many: AtCML8, a Ca 2+ Sensor Acting as a Positive Regulator of Defense Responses against Several Plant Pathogens. Int J Mol Sci 2021; 22:ijms221910469. [PMID: 34638807 PMCID: PMC8508799 DOI: 10.3390/ijms221910469] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2021] [Revised: 09/21/2021] [Accepted: 09/24/2021] [Indexed: 01/11/2023] Open
Abstract
Calcium signals are crucial for the activation and coordination of signaling cascades leading to the establishment of plant defense mechanisms. Here, we studied the contribution of CML8, an Arabidopsis calmodulin-like protein in response to Ralstonia solanacearum and to pathogens with different lifestyles, such as Xanthomonas campestris pv. campestris and Phytophtora capsici. We used pathogenic infection assays, gene expression, RNA-seq approaches, and comparative analysis of public data on CML8 knockdown and overexpressing Arabidopsis lines to demonstrate that CML8 contributes to defense mechanisms against pathogenic bacteria and oomycetes. CML8 gene expression is finely regulated at the root level and manipulated during infection with Ralstonia, and CML8 overexpression confers better plant tolerance. To understand the processes controlled by CML8, genes differentially expressed at the root level in the first hours of infection have been identified. Overexpression of CML8 also confers better tolerance against Xanthomonas and Phytophtora, and most of the genes differentially expressed in response to Ralstonia are differentially expressed in these different pathosystems. Collectively, CML8 acts as a positive regulator against Ralstonia solanaceraum and against other vascular or root pathogens, suggesting that CML8 is a multifunctional protein that regulates common downstream processes involved in the defense response of plants to several pathogens.
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8
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Alonso-Díaz A, Satbhai SB, de Pedro-Jové R, Berry HM, Göschl C, Argueso CT, Novak O, Busch W, Valls M, Coll NS. A genome-wide association study reveals cytokinin as a major component in the root defense responses against Ralstonia solanacearum. JOURNAL OF EXPERIMENTAL BOTANY 2021; 72:2727-2740. [PMID: 33475698 PMCID: PMC8006551 DOI: 10.1093/jxb/eraa610] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2020] [Accepted: 01/19/2021] [Indexed: 05/30/2023]
Abstract
Bacterial wilt caused by the soil-borne pathogen Ralstonia solancearum is economically devastating, with no effective methods to fight the disease. This pathogen invades plants through their roots and colonizes their xylem, clogging the vasculature and causing rapid wilting. Key to preventing colonization are the early defense responses triggered in the host's root upon infection, which remain mostly unknown. Here, we have taken advantage of a high-throughput in vitro infection system to screen natural variability associated with the root growth inhibition phenotype caused by R. solanacearum in Arabidopsis during the first hours of infection. To analyze the genetic determinants of this trait, we have performed a genome-wide association study, identifying allelic variation at several loci related to cytokinin metabolism, including genes responsible for biosynthesis and degradation of cytokinin. Further, our data clearly demonstrate that cytokinin signaling is induced early during the infection process and cytokinin contributes to immunity against R. solanacearum. This study highlights a new role for cytokinin in root immunity, paving the way for future research that will help in understanding the mechanisms underpinning root defenses.
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Affiliation(s)
- Alejandro Alonso-Díaz
- Centre for Research in Agricultural Genomics (CSIC-IRTA-UAB-UB), Bellaterra, Barcelona, Spain
| | - Santosh B Satbhai
- Gregor Mendel Institute (GMI), Austrian Academy of Sciences, Vienna Biocenter (VBC), Dr Bohr-Gasse 3, Vienna 1030, Austria
- Salk Institute For Biological Studies, Plant Molecular and Cellular Biology Laboratory, 10010 N Torrey Pines Rd, La Jolla, CA 92037, USA
| | - Roger de Pedro-Jové
- Centre for Research in Agricultural Genomics (CSIC-IRTA-UAB-UB), Bellaterra, Barcelona, Spain
| | - Hannah M Berry
- Department of Bioagricultural Sciences and Pest Management, Colorado State University, Fort Collins, CO 80523, USA
- Cell and Molecular Biology, Colorado State University, Fort Collins, CO 80523, USA
| | - Christian Göschl
- Gregor Mendel Institute (GMI), Austrian Academy of Sciences, Vienna Biocenter (VBC), Dr Bohr-Gasse 3, Vienna 1030, Austria
| | - Cristiana T Argueso
- Department of Bioagricultural Sciences and Pest Management, Colorado State University, Fort Collins, CO 80523, USA
| | - Ondrej Novak
- Laboratory of Growth Regulators, Olomouc, The Czech Republic
| | - Wolfgang Busch
- Gregor Mendel Institute (GMI), Austrian Academy of Sciences, Vienna Biocenter (VBC), Dr Bohr-Gasse 3, Vienna 1030, Austria
- Salk Institute For Biological Studies, Plant Molecular and Cellular Biology Laboratory, 10010 N Torrey Pines Rd, La Jolla, CA 92037, USA
| | - Marc Valls
- Centre for Research in Agricultural Genomics (CSIC-IRTA-UAB-UB), Bellaterra, Barcelona, Spain
- Genetics Department, University of Barcelona, Barcelona, Spain
| | - Núria S Coll
- Centre for Research in Agricultural Genomics (CSIC-IRTA-UAB-UB), Bellaterra, Barcelona, Spain
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van den Berg N, Swart V, Backer R, Fick A, Wienk R, Engelbrecht J, Prabhu SA. Advances in Understanding Defense Mechanisms in Persea americana Against Phytophthora cinnamomi. FRONTIERS IN PLANT SCIENCE 2021; 12:636339. [PMID: 33747014 PMCID: PMC7971113 DOI: 10.3389/fpls.2021.636339] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2020] [Accepted: 01/18/2021] [Indexed: 06/03/2023]
Abstract
Avocado (Persea americana) is an economically important fruit crop world-wide, the production of which is challenged by notable root pathogens such as Phytophthora cinnamomi and Rosellinia necatrix. Arguably the most prevalent, P. cinnamomi, is a hemibiotrophic oomycete which causes Phytophthora root rot, leading to reduced yields and eventual tree death. Despite its' importance, the development of molecular tools and resources have been historically limited, prohibiting significant progress toward understanding this important host-pathogen interaction. The development of a nested qPCR assay capable of quantifying P. cinnamomi during avocado infection has enabled us to distinguish avocado rootstocks as either resistant or tolerant - an important distinction when unraveling the defense response. This review will provide an overview of our current knowledge on the molecular defense pathways utilized in resistant avocado rootstock against P. cinnamomi. Notably, avocado demonstrates a biphasic phytohormone profile in response to P. cinnamomi infection which allows for the timely expression of pathogenesis-related genes via the NPR1 defense response pathway. Cell wall modification via callose deposition and lignification have also been implicated in the resistant response. Recent advances such as composite plant transformation, single nucleotide polymorphism (SNP) analyses as well as genomics and transcriptomics will complement existing molecular, histological, and biochemical assay studies and further elucidate avocado defense mechanisms.
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Affiliation(s)
- Noëlani van den Berg
- Hans Merensky Chair in Avocado Research, University of Pretoria, Pretoria, South Africa
- Department of Biochemistry, Genetics and Microbiology, Faculty of Natural and Agricultural Sciences, University of Pretoria, Pretoria, South Africa
- Faculty of Natural and Agricultural Sciences, Forestry and Agricultural Biotechnology Institute, University of Pretoria, Pretoria, South Africa
| | - Velushka Swart
- Hans Merensky Chair in Avocado Research, University of Pretoria, Pretoria, South Africa
- Department of Biochemistry, Genetics and Microbiology, Faculty of Natural and Agricultural Sciences, University of Pretoria, Pretoria, South Africa
- Faculty of Natural and Agricultural Sciences, Forestry and Agricultural Biotechnology Institute, University of Pretoria, Pretoria, South Africa
| | - Robert Backer
- Hans Merensky Chair in Avocado Research, University of Pretoria, Pretoria, South Africa
- Department of Biochemistry, Genetics and Microbiology, Faculty of Natural and Agricultural Sciences, University of Pretoria, Pretoria, South Africa
- Faculty of Natural and Agricultural Sciences, Forestry and Agricultural Biotechnology Institute, University of Pretoria, Pretoria, South Africa
| | - Alicia Fick
- Hans Merensky Chair in Avocado Research, University of Pretoria, Pretoria, South Africa
- Department of Biochemistry, Genetics and Microbiology, Faculty of Natural and Agricultural Sciences, University of Pretoria, Pretoria, South Africa
- Faculty of Natural and Agricultural Sciences, Forestry and Agricultural Biotechnology Institute, University of Pretoria, Pretoria, South Africa
| | - Raven Wienk
- Hans Merensky Chair in Avocado Research, University of Pretoria, Pretoria, South Africa
- Department of Biochemistry, Genetics and Microbiology, Faculty of Natural and Agricultural Sciences, University of Pretoria, Pretoria, South Africa
- Faculty of Natural and Agricultural Sciences, Forestry and Agricultural Biotechnology Institute, University of Pretoria, Pretoria, South Africa
| | - Juanita Engelbrecht
- Hans Merensky Chair in Avocado Research, University of Pretoria, Pretoria, South Africa
- Department of Biochemistry, Genetics and Microbiology, Faculty of Natural and Agricultural Sciences, University of Pretoria, Pretoria, South Africa
- Faculty of Natural and Agricultural Sciences, Forestry and Agricultural Biotechnology Institute, University of Pretoria, Pretoria, South Africa
| | - S. Ashok Prabhu
- Hans Merensky Chair in Avocado Research, University of Pretoria, Pretoria, South Africa
- Department of Biochemistry, Genetics and Microbiology, Faculty of Natural and Agricultural Sciences, University of Pretoria, Pretoria, South Africa
- Faculty of Natural and Agricultural Sciences, Forestry and Agricultural Biotechnology Institute, University of Pretoria, Pretoria, South Africa
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10
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Serrazina S, Machado H, Costa RL, Duque P, Malhó R. Expression of Castanea crenata Allene Oxide Synthase in Arabidopsis Improves the Defense to Phytophthora cinnamomi. FRONTIERS IN PLANT SCIENCE 2021; 12:628697. [PMID: 33659016 PMCID: PMC7917121 DOI: 10.3389/fpls.2021.628697] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/12/2020] [Accepted: 01/21/2021] [Indexed: 06/12/2023]
Abstract
Allene oxide synthase (AOS) is a key enzyme of the jasmonic acid (JA) signaling pathway. The AOS gene was previously found to be upregulated in an Asian chestnut species resistant to infection by the oomycete Phytophthora cinnamomi (Castanea crenata), while lower expression values were detected in the susceptible European chestnut (Castanea sativa). Here, we report a genetic and functional characterization of the C. crenata AOS (CcAOS) upon its heterologous gene expression in a susceptible ecotype of Arabidopsis thaliana, which contains a single AOS gene. It was found that Arabidopsis plants expressing CcAOS delay pathogen progression and exhibit more vigorous growth in its presence. They also show upregulation of jasmonic acid and salicylic acid-related genes. As in its native species, heterologous CcAOS localized to plastids, as revealed by confocal imaging of the CcAOS-eGFP fusion protein in transgenic Arabidopsis roots. This observation was confirmed upon transient expression in Nicotiana benthamiana leaf epidermal cells. To further confirm a specific role of CcAOS in the defense mechanism against the pathogen, we performed crosses between transgenic CcAOS plants and an infertile Arabidopsis AOS knockout mutant line. It was found that plants expressing CcAOS exhibit normal growth, remain infertile but are significantly more tolerant to the pathogen than wild type plants. Together, our results indicate that CcAOS is an important player in plant defense responses against oomycete infection and that its expression in susceptible varieties may be a valuable tool to mitigate biotic stress responses.
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Affiliation(s)
- Susana Serrazina
- Faculdade de Ciências, BioISI – Biosystems & Integrative Sciences Institute, Universidade de Lisboa, Lisbon, Portugal
| | - Helena Machado
- INIAV—Instituto Nacional de Investigação Agrária e Veterinária, Oeiras, Portugal
| | - Rita Lourenço Costa
- INIAV—Instituto Nacional de Investigação Agrária e Veterinária, Oeiras, Portugal
- Centro de Estudos Florestais, Instituto Superior de Agronomia, Universidade de Lisboa—Tapada da Ajuda, Lisbon, Portugal
| | - Paula Duque
- Instituto Gulbenkian de Ciência, Oeiras, Portugal
| | - Rui Malhó
- Faculdade de Ciências, BioISI – Biosystems & Integrative Sciences Institute, Universidade de Lisboa, Lisbon, Portugal
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11
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Fröschel C, Komorek J, Attard A, Marsell A, Lopez-Arboleda WA, Le Berre J, Wolf E, Geldner N, Waller F, Korte A, Dröge-Laser W. Plant roots employ cell-layer-specific programs to respond to pathogenic and beneficial microbes. Cell Host Microbe 2020; 29:299-310.e7. [PMID: 33378688 DOI: 10.1016/j.chom.2020.11.014] [Citation(s) in RCA: 49] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2020] [Revised: 10/02/2020] [Accepted: 11/25/2020] [Indexed: 12/12/2022]
Abstract
Plant roots are built of concentric cell layers that are thought to respond to microbial infections by employing specific, genetically defined programs. Yet, the functional impact of this radial organization remains elusive, particularly due to the lack of genome-wide techniques for monitoring expression at a cell-layer resolution. Here, cell-type-specific expression of tagged ribosomes enabled the isolation of ribosome-bound mRNA to obtain cell-layer translatomes (TRAP-seq, translating ribosome affinity purification and RNA sequencing). After inoculation with the vascular pathogen Verticillium longisporum, pathogenic oomycete Phytophthora parasitica, or mutualistic endophyte Serendipita indica, root cell-layer responses reflected the fundamentally different colonization strategies of these microbes. Notably, V. longisporum specifically suppressed the endodermal barrier, which restricts fungal progression, allowing microbial access to the root central cylinder. Moreover, localized biosynthesis of antimicrobial compounds and ethylene differed in response to pathogens and mutualists. These examples highlight the power of this resource to gain insights into root-microbe interactions and to develop strategies in crop improvement.
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Affiliation(s)
- Christian Fröschel
- Department of Pharmaceutical Biology, Julius-von-Sachs-Institute, Julius-Maximilians-Universität Würzburg, Julius-von-Sachs Platz 2, 97082 Würzburg, Germany
| | - Jaqueline Komorek
- Department of Pharmaceutical Biology, Julius-von-Sachs-Institute, Julius-Maximilians-Universität Würzburg, Julius-von-Sachs Platz 2, 97082 Würzburg, Germany
| | - Agnès Attard
- INRAE, CNRS, ISA, Université Côte d'Azur, 400 Route des Chappes, 06903 Sophia Antipolis, France
| | - Alexander Marsell
- Department of Pharmaceutical Biology, Julius-von-Sachs-Institute, Julius-Maximilians-Universität Würzburg, Julius-von-Sachs Platz 2, 97082 Würzburg, Germany
| | - William A Lopez-Arboleda
- Center for Computational and Theoretical Biology, CCTB, Julius-Maximilians-Universität Würzburg, Klara-Oppenheimer-Weg 32, 97074 Würzburg, Germany
| | - Joëlle Le Berre
- INRAE, CNRS, ISA, Université Côte d'Azur, 400 Route des Chappes, 06903 Sophia Antipolis, France
| | - Elmar Wolf
- Department of Biochemistry and Molecular Biology, Biocenter, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Niko Geldner
- Department of Plant Molecular Biology, Université de Lausanne, Biophore Building, Unil-Sorge, 1015 Lausanne, Switzerland
| | - Frank Waller
- Department of Pharmaceutical Biology, Julius-von-Sachs-Institute, Julius-Maximilians-Universität Würzburg, Julius-von-Sachs Platz 2, 97082 Würzburg, Germany
| | - Arthur Korte
- Center for Computational and Theoretical Biology, CCTB, Julius-Maximilians-Universität Würzburg, Klara-Oppenheimer-Weg 32, 97074 Würzburg, Germany
| | - Wolfgang Dröge-Laser
- Department of Pharmaceutical Biology, Julius-von-Sachs-Institute, Julius-Maximilians-Universität Würzburg, Julius-von-Sachs Platz 2, 97082 Würzburg, Germany.
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12
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Bassani I, Larousse M, Tran QD, Attard A, Galiana E. Phytophthora zoospores: From perception of environmental signals to inoculum formation on the host-root surface. Comput Struct Biotechnol J 2020; 18:3766-3773. [PMID: 33304469 PMCID: PMC7718214 DOI: 10.1016/j.csbj.2020.10.045] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2020] [Revised: 10/29/2020] [Accepted: 10/31/2020] [Indexed: 12/13/2022] Open
Abstract
To explore moist soils and to target host plants, phytopathogenic Phytophthora species utilize the sensory and propulsion capabilities of the biflagellate unicellular zoospores they produce. Zoospore motion and interactions with the microenvironment are of primary importance for Phytophthora physiology. These are also of critical significance for plant pathology in early infection sequential events and their regulation: the directed zoospore migration toward the host, the local aggregation and adhesion at the host penetration site. In the soil, these early events preceding the root colonization are orchestrated by guidance factors, released from the soil particles in water films, or emitted within microbiota and by host plants. This signaling network is perceived by zoospores and results in coordinated behavior and preferential localization in the rhizosphere. Recent computational and structural studies suggest that rhizospheric ion and plant metabolite sensing is a key determinant in driving zoospore motion, orientation and aggregation. To reach their target, zoospores respond to various molecular, chemical and electrical stimuli. However, it is not yet clear how these signals are generated in local soil niches and which gene functions govern the sensing and subsequent responses of zoospores. Here we review studies on the soil, microbial and host-plant factors that drive zoospore motion, as well as the adaptations governing zoospore behavior. We propose several research directions that could be explored to characterize the role of zoospore microbial ecology in disease.
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Affiliation(s)
- Ilaria Bassani
- Université Côte d'Azur, INRAE, CNRS, ISA, Sophia Antipolis 06903, France
| | - Marie Larousse
- Université Côte d'Azur, INRAE, CNRS, ISA, Sophia Antipolis 06903, France
| | - Quang D Tran
- Université Côte d'Azur, CNRS, UMR 7010, Institut de Physique de Nice, Nice 06108, France
| | - Agnès Attard
- Université Côte d'Azur, INRAE, CNRS, ISA, Sophia Antipolis 06903, France
| | - Eric Galiana
- Université Côte d'Azur, INRAE, CNRS, ISA, Sophia Antipolis 06903, France
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13
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Integrated Proteomic and Metabolomic Profiling of Phytophthora cinnamomi Attack on Sweet Chestnut ( Castanea sativa) Reveals Distinct Molecular Reprogramming Proximal to the Infection Site and Away from It. Int J Mol Sci 2020; 21:ijms21228525. [PMID: 33198329 PMCID: PMC7697766 DOI: 10.3390/ijms21228525] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2020] [Revised: 11/09/2020] [Accepted: 11/10/2020] [Indexed: 01/15/2023] Open
Abstract
Phytophthora cinnamomi is one of the most invasive tree pathogens that devastates wild and cultivated forests. Due to its wide host range, knowledge of the infection process at the molecular level is lacking for most of its tree hosts. To expand the repertoire of studied Phytophthora-woody plant interactions and identify molecular mechanisms that can facilitate discovery of novel ways to control its spread and damaging effects, we focused on the interaction between P. cinnamomi and sweet chestnut (Castanea sativa), an economically important tree for the wood processing industry. By using a combination of proteomics, metabolomics, and targeted hormonal analysis, we mapped the effects of P. cinnamomi attack on stem tissues immediately bordering the infection site and away from it. P. cinnamomi led to a massive reprogramming of the chestnut proteome and accumulation of the stress-related hormones salicylic acid (SA) and jasmonic acid (JA), indicating that stem inoculation can be used as an easily accessible model system to identify novel molecular players in P. cinnamomi pathogenicity.
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14
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Lacaze A, Joly DL. Structural specificity in plant-filamentous pathogen interactions. MOLECULAR PLANT PATHOLOGY 2020; 21:1513-1525. [PMID: 32889752 PMCID: PMC7548998 DOI: 10.1111/mpp.12983] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2020] [Revised: 07/06/2020] [Accepted: 07/26/2020] [Indexed: 05/07/2023]
Abstract
Plant diseases bear names such as leaf blights, root rots, sheath blights, tuber scabs, and stem cankers, indicating that symptoms occur preferentially on specific parts of host plants. Accordingly, many plant pathogens are specialized to infect and cause disease in specific tissues and organs. Conversely, others are able to infect a range of tissues, albeit often disease symptoms fluctuate in different organs infected by the same pathogen. The structural specificity of a pathogen defines the degree to which it is reliant on a given tissue, organ, or host developmental stage. It is influenced by both the microbe and the host but the processes shaping it are not well established. Here we review the current status on structural specificity of plant-filamentous pathogen interactions and highlight important research questions. Notably, this review addresses how constitutive defence and induced immunity as well as virulence processes vary across plant organs, tissues, and even cells. A better understanding of the mechanisms underlying structural specificity will aid targeted approaches for plant health, for instance by considering the variation in the nature and the amplitude of defence responses across distinct plant organs and tissues when performing selective breeding.
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Affiliation(s)
- Aline Lacaze
- Department of BiologyUniversité de MonctonMonctonCanada
| | - David L. Joly
- Department of BiologyUniversité de MonctonMonctonCanada
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15
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Ropitaux M, Bernard S, Schapman D, Follet-Gueye ML, Vicré M, Boulogne I, Driouich A. Root Border Cells and Mucilage Secretions of Soybean, Glycine Max (Merr) L.: Characterization and Role in Interactions with the Oomycete Phytophthora Parasitica. Cells 2020; 9:E2215. [PMID: 33008016 PMCID: PMC7650559 DOI: 10.3390/cells9102215] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2020] [Revised: 09/17/2020] [Accepted: 09/22/2020] [Indexed: 01/06/2023] Open
Abstract
Root border cells (BCs) and their associated secretions form a protective structure termed the root extracellular trap (RET) that plays a major role in root interactions with soil borne microorganisms. In this study, we investigated the release and morphology of BCs of Glycine max using light and cryo-scanning electron microscopy (SEM). We also examined the occurrence of cell-wall glycomolecules in BCs and secreted mucilage using immunofluorescence microscopy in conjunction with anti-glycan antibodies. Our data show that root tips released three populations of BCs defined as spherical, intermediate and elongated cells. The mechanism of shedding seemed to be cell morphotype-specific. The data also show that mucilage contained pectin, cellulose, extracellular DNA, histones and two hemicellulosic polysaccharides, xyloglucan and heteromannan. The latter has never been reported previously in any plant root secretions. Both hemicellulosic polysaccharides formed a dense fibrillary network embedding BCs and holding them together within the mucilage. Finally, we investigated the effect of the RET on the interactions of root with the pathogenic oomycete Phytophthora parasitica early during infection. Our findings reveal that the RET prevented zoospores from colonizing root tips by blocking their entry into root tissues and inducing their lysis.
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Affiliation(s)
- Marc Ropitaux
- Laboratoire de Glycobiologie et Matrice Extracellulaire Végétale, UPRES-EA 4358, Fédération de Recherche « Normandie-Végétal »-FED 4277, Université de ROUEN Normandie, UFR des Sciences et Techniques, F-76821 Mont-Saint-Aignan, France; (M.R.); (S.B.); (M.-L.F.-G.); (M.V.); (I.B.)
| | - Sophie Bernard
- Laboratoire de Glycobiologie et Matrice Extracellulaire Végétale, UPRES-EA 4358, Fédération de Recherche « Normandie-Végétal »-FED 4277, Université de ROUEN Normandie, UFR des Sciences et Techniques, F-76821 Mont-Saint-Aignan, France; (M.R.); (S.B.); (M.-L.F.-G.); (M.V.); (I.B.)
- Cell Imaging Platform (PRIMACEN-IRIB), Université de ROUEN Normandie, UFR des Sciences et Techniques, F-76821 Mont-Saint-Aignan, France;
| | - Damien Schapman
- Cell Imaging Platform (PRIMACEN-IRIB), Université de ROUEN Normandie, UFR des Sciences et Techniques, F-76821 Mont-Saint-Aignan, France;
| | - Marie-Laure Follet-Gueye
- Laboratoire de Glycobiologie et Matrice Extracellulaire Végétale, UPRES-EA 4358, Fédération de Recherche « Normandie-Végétal »-FED 4277, Université de ROUEN Normandie, UFR des Sciences et Techniques, F-76821 Mont-Saint-Aignan, France; (M.R.); (S.B.); (M.-L.F.-G.); (M.V.); (I.B.)
- Cell Imaging Platform (PRIMACEN-IRIB), Université de ROUEN Normandie, UFR des Sciences et Techniques, F-76821 Mont-Saint-Aignan, France;
| | - Maïté Vicré
- Laboratoire de Glycobiologie et Matrice Extracellulaire Végétale, UPRES-EA 4358, Fédération de Recherche « Normandie-Végétal »-FED 4277, Université de ROUEN Normandie, UFR des Sciences et Techniques, F-76821 Mont-Saint-Aignan, France; (M.R.); (S.B.); (M.-L.F.-G.); (M.V.); (I.B.)
| | - Isabelle Boulogne
- Laboratoire de Glycobiologie et Matrice Extracellulaire Végétale, UPRES-EA 4358, Fédération de Recherche « Normandie-Végétal »-FED 4277, Université de ROUEN Normandie, UFR des Sciences et Techniques, F-76821 Mont-Saint-Aignan, France; (M.R.); (S.B.); (M.-L.F.-G.); (M.V.); (I.B.)
| | - Azeddine Driouich
- Laboratoire de Glycobiologie et Matrice Extracellulaire Végétale, UPRES-EA 4358, Fédération de Recherche « Normandie-Végétal »-FED 4277, Université de ROUEN Normandie, UFR des Sciences et Techniques, F-76821 Mont-Saint-Aignan, France; (M.R.); (S.B.); (M.-L.F.-G.); (M.V.); (I.B.)
- Cell Imaging Platform (PRIMACEN-IRIB), Université de ROUEN Normandie, UFR des Sciences et Techniques, F-76821 Mont-Saint-Aignan, France;
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16
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Perrine-Walker F. Phytophthora palmivora-Cocoa Interaction. J Fungi (Basel) 2020; 6:jof6030167. [PMID: 32916858 PMCID: PMC7558484 DOI: 10.3390/jof6030167] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2020] [Revised: 08/28/2020] [Accepted: 09/07/2020] [Indexed: 12/21/2022] Open
Abstract
Phytophthora palmivora (Butler) is an hemibiotrophic oomycete capable of infecting over 200 plant species including one of the most economically important crops, Theobroma cacao L. commonly known as cocoa. It infects many parts of the cocoa plant including the pods, causing black pod rot disease. This review will focus on P. palmivora’s ability to infect a plant host to cause disease. We highlight some current findings in other Phytophthora sp. plant model systems demonstrating how the germ tube, the appressorium and the haustorium enable the plant pathogen to penetrate a plant cell and how they contribute to the disease development in planta. This review explores the molecular exchange between the oomycete and the plant host, and the role of plant immunity during the development of such structures, to understand the infection of cocoa pods by P. palmivora isolates from Papua New Guinea.
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Affiliation(s)
- Francine Perrine-Walker
- School of Life and Environmental Sciences, The University of Sydney, LEES Building (F22), Camperdown, NSW 2006, Australia;
- The University of Sydney Institute of Agriculture, 1 Central Avenue, Australian Technology Park, Eveleigh, NSW 2015, Australia
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17
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Lu W, Deng F, Jia J, Chen X, Li J, Wen Q, Li T, Meng Y, Shan W. The Arabidopsis thaliana gene AtERF019 negatively regulates plant resistance to Phytophthora parasitica by suppressing PAMP-triggered immunity. MOLECULAR PLANT PATHOLOGY 2020; 21:1179-1193. [PMID: 32725756 PMCID: PMC7411552 DOI: 10.1111/mpp.12971] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2020] [Revised: 06/11/2020] [Accepted: 06/12/2020] [Indexed: 05/18/2023]
Abstract
Phytophthora species are destructive plant pathogens that cause significant crop losses worldwide. To understand plant susceptibility to oomycete pathogens and to explore novel disease resistance strategies, we employed the Arabidopsis thaliana-Phytophthora parasitica model pathosystem and screened for A. thaliana T-DNA insertion mutant lines resistant to P. parasitica. This led to the identification of the resistant mutant 267-31, which carries two T-DNA insertion sites in the promoter region of the ethylene-responsive factor 19 gene (ERF019). Quantitative reverse transcription PCR (RT-qPCR) assays showed that the expression of ERF019 was induced during P. parasitica infection in the wild type, which was suppressed in the 267-31 mutant. Additional erf019 mutants were generated using CRISPR/Cas9 technology and were confirmed to have increased resistance to P. parasitica. In contrast, ERF019 overexpression lines were more susceptible. Transient overexpression assays in Nicotiana benthamiana showed that the nuclear localization of ERF019 is crucial for its susceptible function. RT-qPCR analyses showed that the expression of marker genes for multiple defence pathways was significantly up-regulated in the mutant compared with the wild type during infection. Flg22-induced hydrogen peroxide accumulation and reactive oxygen species burst were impaired in ERF019 overexpression lines, and flg22-induced MAPK activation was enhanced in erf019 mutants. Moreover, transient overexpression of ERF019 strongly suppressed INF-triggered cell death in N. benthamiana. These results reveal the importance of ERF019 in mediating plant susceptibility to P. parasitica through suppression of pathogen-associated molecular pattern-triggered immunity.
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Affiliation(s)
- Wenqin Lu
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Plant ProtectionNorthwest A&F UniversityYanglingChina
| | - Fengyan Deng
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Life SciencesNorthwest A&F UniversityYanglingChina
| | - Jinbu Jia
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Plant ProtectionNorthwest A&F UniversityYanglingChina
- Institute of Plant and Food ScienceDepartment of BiologySouthern University of Science and TechnologyShenzhenChina
| | - Xiaokang Chen
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of HorticultureNorthwest A&F UniversityYanglingChina
| | - Jinfang Li
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Plant ProtectionNorthwest A&F UniversityYanglingChina
| | - Qujiang Wen
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Plant ProtectionNorthwest A&F UniversityYanglingChina
| | - Tingting Li
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of AgronomyNorthwest A&F UniversityYanglingChina
| | - Yuling Meng
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of AgronomyNorthwest A&F UniversityYanglingChina
| | - Weixing Shan
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of AgronomyNorthwest A&F UniversityYanglingChina
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18
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Wu J, Handique U, Graham J, Johnson E. Phytophthora nicotianae Infection of Citrus Leaves and Host Defense Activation Compared to Root Infection. PHYTOPATHOLOGY 2020; 110:1437-1448. [PMID: 32228377 DOI: 10.1094/phyto-09-19-0343-r] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Currently, little is known about the host pathogen interaction between Phytophthora spp. and citrus roots versus leaves. Therefore, we compared the molecular events occurring in citrus roots and leaves after zoospore inoculation with Phytophthora nicotianae. We analyzed the physical characteristics and genetic responses to P. nicotianae infection of leaves and roots for susceptible and tolerant citrus rootstocks to examine the potential for leaves to model root responses to P. nicotianae infection. Leaves responded faster and stronger to P. nicotianae infection than roots, and leaves showed greater differential response than roots. In addition to differences in hormonal responses, sugar, phospholipase D (PLD), and phospholipase A (PLA) involvement in the interaction between citrus and P. nicotianae was identified. This work, for the first time, creates a solid P. nicotianae zoospore infection protocol, reports P. nicotianae infection on citrus leaves through stomata, and provides evidence that different host organs respond to the pathogen differentially in timing and magnitude. This work identifies the hormones, sugars, pathogenesis-related genes, PLDs, and PLAs that are involved in the molecular events occurring in citrus under infection of P. nicotianae zoospore, and advances our understanding of the mechanisms underlying the interaction.
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Affiliation(s)
- Jian Wu
- Citrus Research and Education Center, University of Florida, 700 Experiment Station Road, Lake Alfred, FL, U.S.A
- Potato Engineering & Technology Research Center, Inner Mongolia University, 235 University Road, Hohhot, Inner Mongolia, China
| | - Utpal Handique
- Citrus Research and Education Center, University of Florida, 700 Experiment Station Road, Lake Alfred, FL, U.S.A
- Potato Engineering & Technology Research Center, Inner Mongolia University, 235 University Road, Hohhot, Inner Mongolia, China
| | - James Graham
- Citrus Research and Education Center, University of Florida, 700 Experiment Station Road, Lake Alfred, FL, U.S.A
| | - Evan Johnson
- Citrus Research and Education Center, University of Florida, 700 Experiment Station Road, Lake Alfred, FL, U.S.A
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19
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Wang X, Zhao Z, Guo N, Wang H, Zhao J, Xing H. Comparative Proteomics Analysis Reveals That Lignin Biosynthesis Contributes to Brassinosteroid-Mediated Response to Phytophthora sojae in Soybeans. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2020; 68:5496-5506. [PMID: 32302119 DOI: 10.1021/acs.jafc.0c00848] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Brassinosteroids (BRs) are a group of steroid plant hormones regulating normal growth, development, and stress response in plants. However, the mechanisms by which BRs interfere with the resistance of soybean to Phytophthora sojae (P. sojae) remain largely unknown. The present study analyzed the role of BRs in soybean response against P. sojae by comparative proteomic approaches. A total of 52,381 peptides were obtained by trypsin digestion of 9,680 proteins, among which 6,640 proteins were quantified, and 402 proteins were identified as differentially expressed proteins (DEPs). Further analysis revealed that DEPs were significantly involved in the lignin biosynthesis pathway. The expression of the majority of key enzymes involved in lignin biosynthesis was upregulated by BR-pretreatment and P. sojae infection, and lignin accumulation was faster in BR-pretreated soybeans than in untreated controls. Additionally, accumulation of lignin was consistent with these enzyme expressions levels and resistance phenotype. These findings advance the understanding of the role of BRs in the interaction between soybeans and P. sojae.
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Affiliation(s)
- Xinfang Wang
- National Center for Soybean Improvement, Key Laboratory of Biology and Genetics and Breeding for Soybean, Ministry of Agriculture, State Key Laboratory for Crop Genetics and Germplasm Enhancement, College of Agriculture, Nanjing Agricultural University, Nanjing 210095, China
| | - Zisu Zhao
- National Center for Soybean Improvement, Key Laboratory of Biology and Genetics and Breeding for Soybean, Ministry of Agriculture, State Key Laboratory for Crop Genetics and Germplasm Enhancement, College of Agriculture, Nanjing Agricultural University, Nanjing 210095, China
| | - Na Guo
- National Center for Soybean Improvement, Key Laboratory of Biology and Genetics and Breeding for Soybean, Ministry of Agriculture, State Key Laboratory for Crop Genetics and Germplasm Enhancement, College of Agriculture, Nanjing Agricultural University, Nanjing 210095, China
| | - Haitang Wang
- National Center for Soybean Improvement, Key Laboratory of Biology and Genetics and Breeding for Soybean, Ministry of Agriculture, State Key Laboratory for Crop Genetics and Germplasm Enhancement, College of Agriculture, Nanjing Agricultural University, Nanjing 210095, China
| | - Jinming Zhao
- National Center for Soybean Improvement, Key Laboratory of Biology and Genetics and Breeding for Soybean, Ministry of Agriculture, State Key Laboratory for Crop Genetics and Germplasm Enhancement, College of Agriculture, Nanjing Agricultural University, Nanjing 210095, China
| | - Han Xing
- National Center for Soybean Improvement, Key Laboratory of Biology and Genetics and Breeding for Soybean, Ministry of Agriculture, State Key Laboratory for Crop Genetics and Germplasm Enhancement, College of Agriculture, Nanjing Agricultural University, Nanjing 210095, China
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20
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Castilleux R, Plancot B, Gügi B, Attard A, Loutelier-Bourhis C, Lefranc B, Nguema-Ona E, Arkoun M, Yvin JC, Driouich A, Vicré M. Extensin arabinosylation is involved in root response to elicitors and limits oomycete colonization. ANNALS OF BOTANY 2020; 125:751-763. [PMID: 31242281 PMCID: PMC7182588 DOI: 10.1093/aob/mcz068] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2018] [Accepted: 04/23/2019] [Indexed: 05/20/2023]
Abstract
BACKGROUND AND AIMS Extensins are hydroxyproline-rich glycoproteins thought to strengthen the plant cell wall, one of the first barriers against pathogens, through intra- and intermolecular cross-links. The glycan moiety of extensins is believed to confer the correct structural conformation to the glycoprotein, leading to self-assembly within the cell wall that helps limit microbial adherence and invasion. However, this role is not clearly established. METHODS We used Arabidopsis thaliana mutants impaired in extensin arabinosylation to investigate the role of extensin arabinosylation in root-microbe interactions. Mutant and wild-type roots were stimulated to elicit an immune response with flagellin 22 and immunolabelled with a set of anti-extensin antibodies. Roots were also inoculated with a soilborne oomycete, Phytophthora parasitica, to assess the effect of extensin arabinosylation on root colonization. KEY RESULTS A differential distribution of extensin epitopes was observed in wild-type plants in response to elicitation. Elicitation also triggers altered epitope expression in mutant roots compared with wild-type and non-elicited roots. Inoculation with the pathogen P. parasitica resulted in enhanced root colonization for two mutants, specifically xeg113 and rra2. CONCLUSIONS We provide evidence for a link between extensin arabinosylation and root defence, and propose a model to explain the importance of glycosylation in limiting invasion of root cells by pathogenic oomycetes.
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Affiliation(s)
- Romain Castilleux
- Normandie Université, UNIROUEN, Laboratoire Glyco-MEV EA 4358, Fédération de Recherche ‘Normandie Végétal’ FED, Rouen, France
| | - Barbara Plancot
- Normandie Université, UNIROUEN, Laboratoire Glyco-MEV EA 4358, Fédération de Recherche ‘Normandie Végétal’ FED, Rouen, France
| | - Bruno Gügi
- Normandie Université, UNIROUEN, Laboratoire Glyco-MEV EA 4358, Fédération de Recherche ‘Normandie Végétal’ FED, Rouen, France
| | | | - Corinne Loutelier-Bourhis
- IRCOF COBRA, UMR6014 and FR3038, CNRS, Université de Rouen Normandie, Mont-Saint-Aignan Cedex, France
| | - Benjamin Lefranc
- INSERM U1239, Différenciation et Communication Neuronale et Neuroendocrine, Normandie Université, Rouen, France
| | - Eric Nguema-Ona
- Centre Mondial de l’Innovation, Groupe Roullier, Saint Malo Cédex, France
| | - Mustapha Arkoun
- Centre Mondial de l’Innovation, Groupe Roullier, Saint Malo Cédex, France
| | - Jean-Claude Yvin
- Centre Mondial de l’Innovation, Groupe Roullier, Saint Malo Cédex, France
| | - Azeddine Driouich
- Normandie Université, UNIROUEN, Laboratoire Glyco-MEV EA 4358, Fédération de Recherche ‘Normandie Végétal’ FED, Rouen, France
| | - Maïté Vicré
- Normandie Université, UNIROUEN, Laboratoire Glyco-MEV EA 4358, Fédération de Recherche ‘Normandie Végétal’ FED, Rouen, France
- For correspondence. E-mail
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21
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Evangelisti E, Yunusov T, Shenhav L, Schornack S. N-acetyltransferase AAC(3)-I confers gentamicin resistance to Phytophthora palmivora and Phytophthora infestans. BMC Microbiol 2019; 19:265. [PMID: 31775609 PMCID: PMC6882347 DOI: 10.1186/s12866-019-1642-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2019] [Accepted: 11/14/2019] [Indexed: 12/12/2022] Open
Abstract
Background Oomycetes are pathogens of mammals, fish, insects and plants, and the potato late blight agent Phytophthora infestans and the oil palm and cocoa infecting pathogen Phytophthora palmivora cause economically impacting diseases on a wide range of crop plants. Increasing genomic and transcriptomic resources and recent advances in oomycete biology demand new strategies for genetic modification of oomycetes. Most oomycete transformation procedures rely on geneticin-based selection of transgenic strains. Results We established N-acetyltransferase AAC(3)-I as a gentamicin-based selectable marker for oomycete transformation without interference with existing geneticin resistance. Strains carrying gentamicin resistance are fully infectious in plants. We further demonstrate the usefulness of this new antibiotic selection to super-transform well-characterized, already fluorescently-labelled P. palmivora strains and provide a comprehensive protocol for maintenance and zoospore electro-transformation of Phytophthora strains to aid in plant-pathogen research. Conclusions N-acetyltransferase AAC(3)-I is functional in Phytophthora oomycetes. In addition, the substrate specificity of the AAC(3)-I enzyme allows for re-transformation of geneticin-resistant strains. Our findings and resources widen the possibilities to study oomycete cell biology and plant-oomycete interactions.
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Affiliation(s)
| | - Temur Yunusov
- Sainsbury Laboratory Cambridge University (SLCU), Cambridge, UK
| | - Liron Shenhav
- Sainsbury Laboratory Cambridge University (SLCU), Cambridge, UK
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22
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Wang Y, Tyler BM, Wang Y. Defense and Counterdefense During Plant-Pathogenic Oomycete Infection. Annu Rev Microbiol 2019; 73:667-696. [DOI: 10.1146/annurev-micro-020518-120022] [Citation(s) in RCA: 69] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Plant-pathogenic oomycetes include numerous species that are ongoing threats to agriculture and natural ecosystems. Understanding the molecular dialogs between oomycetes and plants is instrumental for sustaining effective disease control. Plants respond to oomycete infection by multiple defense actions including strengthening of physical barriers, production of antimicrobial molecules, and programmed cell death. These responses are tightly controlled and integrated via a three-layered immune system consisting of a multiplex recognition layer, a resilient signal-integration layer, and a diverse defense-action layer. Adapted oomycete pathogens utilize apoplastic and intracellular effector arsenals to counter plant immunity mechanisms within each layer, including by evasion or suppression of recognition, interference with numerous signaling components, and neutralization or suppression of defense actions. A coevolutionary arms race continually drives the emergence of new mechanisms of plant defense and oomycete counterdefense.
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Affiliation(s)
- Yan Wang
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing 210095, China;,
- Key Laboratory of Integrated Management of Crop Diseases and Pests, Ministry of Education, Nanjing 210095, China
| | - Brett M. Tyler
- Center for Genome Research and Biocomputing and Department of Botany and Plant Pathology, Oregon State University, Corvallis, Oregon 97331, USA
| | - Yuanchao Wang
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing 210095, China;,
- Key Laboratory of Integrated Management of Crop Diseases and Pests, Ministry of Education, Nanjing 210095, China
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23
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CEVHER KESKİN B. Quantitative mRNA Expression Profiles of Germin-Like and Extensin-Like Proteins under Drought Stress in Triticum aestivum. ACTA ACUST UNITED AC 2019. [DOI: 10.38001/ijlsb.566942] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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24
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Huang G, Liu Z, Gu B, Zhao H, Jia J, Fan G, Meng Y, Du Y, Shan W. An RXLR effector secreted by Phytophthora parasitica is a virulence factor and triggers cell death in various plants. MOLECULAR PLANT PATHOLOGY 2019; 20:356-371. [PMID: 30320960 PMCID: PMC6637884 DOI: 10.1111/mpp.12760] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
RXLR effectors encoded by Phytophthora species play a central role in pathogen-plant interactions. An understanding of the biological functions of RXLR effectors is conducive to the illumination of the pathogenic mechanisms and the development of disease control strategies. However, the virulence function of Phytophthora parasitica RXLR effectors is poorly understood. Here, we describe the identification of a P. parasitica RXLR effector gene, PPTG00121 (PpE4), which is highly transcribed during the early stages of infection. Live cell imaging of P. parasitica transformants expressing a full-length PpE4 (E4FL)-mCherry protein indicated that PpE4 is secreted and accumulates around haustoria during plant infection. Silencing of PpE4 in P. parasitica resulted in significantly reduced virulence on Nicotiana benthamiana. Transient expression of PpE4 in N. benthamiana in turn restored the pathogenicity of the PpE4-silenced lines. Furthermore, the expression of PpE4 in both N. benthamiana and Arabidopsis thaliana consistently enhanced plant susceptibility to P. parasitica. These results indicate that PpE4 contributes to pathogen infection. Finally, heterologous expression experiments showed that PpE4 triggers non-specific cell death in a variety of plants, including tobacco, tomato, potato and A. thaliana. Virus-induced gene silencing assays revealed that PpE4-induced cell death is dependent on HSP90, NPK and SGT1, suggesting that PpE4 is recognized by the plant immune system. In conclusion, PpE4 is an important virulence RXLR effector of P. parasitica and recognized by a wide range of host plants.
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Affiliation(s)
- Guiyan Huang
- State Key Laboratory of Crop Stress Biology for Arid AreasNorthwest A&F UniversityYanglingShaanxi712100China
- College of Life SciencesNorthwest A&F UniversityYanglingShaanxi712100China
| | - Zhirou Liu
- State Key Laboratory of Crop Stress Biology for Arid AreasNorthwest A&F UniversityYanglingShaanxi712100China
- College of Plant ProtectionNorthwest A&F UniversityYanglingShaanxi712100China
| | - Biao Gu
- State Key Laboratory of Crop Stress Biology for Arid AreasNorthwest A&F UniversityYanglingShaanxi712100China
- College of Plant ProtectionNorthwest A&F UniversityYanglingShaanxi712100China
| | - Hong Zhao
- State Key Laboratory of Crop Stress Biology for Arid AreasNorthwest A&F UniversityYanglingShaanxi712100China
- College of Plant ProtectionNorthwest A&F UniversityYanglingShaanxi712100China
| | - Jinbu Jia
- State Key Laboratory of Crop Stress Biology for Arid AreasNorthwest A&F UniversityYanglingShaanxi712100China
- College of Plant ProtectionNorthwest A&F UniversityYanglingShaanxi712100China
- Institute of Plant and Food Science, Department of BiologySouthern University of Science and TechnologyShenzhen518055China
| | - Guangjin Fan
- State Key Laboratory of Crop Stress Biology for Arid AreasNorthwest A&F UniversityYanglingShaanxi712100China
- College of Plant ProtectionNorthwest A&F UniversityYanglingShaanxi712100China
| | - Yuling Meng
- State Key Laboratory of Crop Stress Biology for Arid AreasNorthwest A&F UniversityYanglingShaanxi712100China
- College of AgronomyNorthwest A&F UniversityYanglingShaanxi712100China
| | - Yu Du
- State Key Laboratory of Crop Stress Biology for Arid AreasNorthwest A&F UniversityYanglingShaanxi712100China
- College of HorticultureNorthwest A&F UniversityYanglingShaanxi712100China
| | - Weixing Shan
- State Key Laboratory of Crop Stress Biology for Arid AreasNorthwest A&F UniversityYanglingShaanxi712100China
- College of AgronomyNorthwest A&F UniversityYanglingShaanxi712100China
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25
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Saad RF, Kobaissi A, Echevarria G, Kidd P, Calusinska M, Goux X, Benizri E. Influence of new agromining cropping systems on soil bacterial diversity and the physico-chemical characteristics of an ultramafic soil. THE SCIENCE OF THE TOTAL ENVIRONMENT 2018; 645:380-392. [PMID: 30029117 DOI: 10.1016/j.scitotenv.2018.07.106] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2018] [Revised: 07/09/2018] [Accepted: 07/09/2018] [Indexed: 06/08/2023]
Abstract
Most of the research dedicated to agromining has focused on cultivating a single hyperaccumulator plant, although plant diversity has been shown to positively modify soil characteristics. Hence, we compared the effect of cropping a nickel-hyperaccumulator Alyssum murale with a legume (Vicia sativa) to A. murale's mono-culture, on the bacterial diversity and physico-chemical characteristics of an ultramafic soil. A pot experiment with 5 replicates was conducted in controlled conditions for 11 months. The treatments studied were: co-cropping and rotation vs. mineral fertilization controls and bare soil. The introduction of legumes induced a clearly positive effect on the soil's microbial biomass carbon and nitrogen. Arylsulfatase and urease activities tended to be enhanced in the co-cropping and rotation treatments and to be lessened in the mineral fertilization treatments. However, β-glucosidase and phosphatase activities were seen to decrease when legumes were used. Our results showed that the rotation treatment induced a higher organic matter content than the fertilized control did. Actinobacteria was the most-represented bacterial phyla and had lower relative abundance in treatments associating legumes. Conversely, the relative abundance of Acidobacteria and Gemmatimonadetes phyla increased but not significantly in treatments with legumes. The relative abundance of Chloroflexi phylum was shown to be significantly higher for the fertilized rotation control. The relative abundance of β-Proteobacteria subphylum increased but not significantly in treatments with legumes. NMDS analysis showed a clear separation between planted treatments and bare soil and between co-cropping and rotation and fertilized controls. Shannon index showed reduction in microbial diversity that was mainly due to chemical inputs in the soil. This study showed that these new cropping systems influenced both the bacterial diversity and the physico-chemical characteristics of an ultramafic soil. In addition, this study provides evidence that mineral fertilization can negatively impact bacterial communities and some of their functions linked to biogeochemical cycles.
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Affiliation(s)
- Ramez F Saad
- Université de Lorraine, INRA, Laboratoire Sols et Environnement, 54000 Nancy, France; Université Libanaise, Laboratoire «Applied Plant Biotechnology», Faculté des Sciences 1, Beyrouth, Lebanon
| | - Ahmad Kobaissi
- Université Libanaise, Laboratoire «Applied Plant Biotechnology», Faculté des Sciences 1, Beyrouth, Lebanon
| | - Guillaume Echevarria
- Université de Lorraine, INRA, Laboratoire Sols et Environnement, 54000 Nancy, France
| | - Petra Kidd
- Instituto de Investigaciones Agrobiológicas de Galicia (IIAG), Consejo Superior de Investigaciones Científicas (CSIC), Santiago de Compostela 15706, Spain
| | - Magdalena Calusinska
- Environmental Research and Innovation (ERIN) Department, Luxembourg Institute of Science and Technology (LIST), 4422 Belvaux, Luxembourg
| | - Xavier Goux
- Environmental Research and Innovation (ERIN) Department, Luxembourg Institute of Science and Technology (LIST), 4422 Belvaux, Luxembourg
| | - Emile Benizri
- Université de Lorraine, INRA, Laboratoire Sols et Environnement, 54000 Nancy, France.
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26
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Wang Y, Wang Y. Phytophthora sojae effectors orchestrate warfare with host immunity. Curr Opin Microbiol 2018; 46:7-13. [PMID: 29454192 DOI: 10.1016/j.mib.2018.01.008] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2017] [Accepted: 01/11/2018] [Indexed: 11/26/2022]
Abstract
Phytophthora sojae is one of the most damaging plant pathogens of soybean. To aid establishment of a compatible interaction with its host, P. sojae deploys many secreted effectors. These effectors act either in the apoplastic space to cope with hostile conditions or inside of host cells to reprogram host physiology favoring pathogen growth. Effectors have been used as molecular probes, which revealed in Phytophthora that effectors execute their virulence function via manipulating host targets. In addition, recent studies have discovered 'pseudo-effectors' in Phytophthora that act as decoys to shield virulence effectors from host defense, a new paradigm in plant-pathogen interactions.
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Affiliation(s)
- Yan Wang
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing 210095, China; Key Laboratory of Integrated Management of Crop Diseases and Pests (Ministry of Education), Nanjing 210095, China
| | - Yuanchao Wang
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing 210095, China; Key Laboratory of Integrated Management of Crop Diseases and Pests (Ministry of Education), Nanjing 210095, China.
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27
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Comparative Transcriptome Analysis between a Resistant and a Susceptible Wild Tomato Accession in Response to Phytophthora parasitica. Int J Mol Sci 2018; 19:ijms19123735. [PMID: 30477181 PMCID: PMC6320849 DOI: 10.3390/ijms19123735] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2018] [Revised: 11/19/2018] [Accepted: 11/20/2018] [Indexed: 01/25/2023] Open
Abstract
Phytophthora parasitica is one of the most widespread Phytophthora species, which is known to cause multiple diseases in tomato and is capable of infecting almost all plant parts. Our current understanding of tomato-Phytophthora parasitica interaction is very limited and currently nothing is known at the whole genome or transcriptome level. In this study, we have analyzed and compared the transcriptome of a resistant and a susceptible wild tomato accession in response to P. parasitica infection using the RNA-seq technology. We have identified 2657 and 3079 differentially expressed genes (DEGs) in treatment vs control comparison of resistant (Sp-R) and susceptible (Sp-S) samples respectively. Functional annotation of DEGs revealed substantial transcriptional reprogramming of diverse physiological and cellular processes, particularly the biotic stress responses in both Sp-R and Sp-S upon P. parasitica treatment. However, subtle expression differences among some core plant defense related genes were identified and their possible role in resistance development against P. parasitica is discussed. Our results revealed 1173 genes that were differentially expressed only in Sp-R accession upon P. parasitica inoculation. These exclusively found DEGs in Sp-R accession included some core plant defense genes, for example, several protease inhibitors, chitinases, defensin, PR-1, a downy mildew susceptibility factor, and so on, were all highly induced. Whereas, several R genes, WRKY transcriptions factors and a powdery mildew susceptibility gene (Mlo) were highly repressed during the resistance outcome. Analysis reported here lays out a strong foundation for future studies aimed at improving genetic resistance of tomato cultivars against to Phytopphthora species.
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28
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van den Berg N, Mahomed W, Olivier NA, Swart V, Crampton BG. Transcriptome analysis of an incompatible Persea americana-Phytophthora cinnamomi interaction reveals the involvement of SA- and JA-pathways in a successful defense response. PLoS One 2018; 13:e0205705. [PMID: 30332458 PMCID: PMC6192619 DOI: 10.1371/journal.pone.0205705] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2018] [Accepted: 09/28/2018] [Indexed: 12/30/2022] Open
Abstract
Phytophthora cinnamomi Rands (Pc) is a hemibiotrophic oomycete and the causal agent of Phytophthora root rot (PRR) of the commercially important fruit crop avocado (Persea americana Mill.). Plant defense against pathogens is modulated by phytohormone signaling pathways such as salicylic acid (SA), jasmonic acid (JA), ethylene (ET), auxin and abscisic acid. The role of specific signaling pathways induced and regulated during hemibiotroph-plant interactions has been widely debated. Some studies report SA mediated defense while others hypothesize that JA responses restrict the spread of pathogens. This study aimed to identify the role of SA- and JA- associated genes in the defense strategy of a resistant avocado rootstock, Dusa in response to Pc infection. Transcripts associated with SA-mediated defense pathways and lignin biosynthesis were upregulated at 6 hours post-inoculation (hpi). Results suggest that auxin, reactive oxygen species (ROS) and Ca2+ signaling was also important during this early time point, while JA signaling was absent. Both SA and JA defense responses were shown to play a role during defense at 18 hpi. Induction of genes associated with ROS detoxification and cell wall digestion (β-1-3-glucanase) was also observed. Most genes induced at 24 hpi were linked to JA responses. Other processes at play in avocado at 24 hpi include cell wall strengthening, the formation of phenolics and induction of arabinogalactan, a gene linked to Pc zoospore immobility. This study represents the first transcriptome wide analysis of a resistant avocado rootstock treated with SA and JA compared to Pc infection. The results provide evidence of a biphasic defense response against the hemibiotroph, which initially involves SA-mediated gene expression followed by the enrichment of JA-mediated defense from 18 to 24 hpi. Genes and molecular pathways linked to Pc resistance are highlighted and may serve as future targets for manipulation in the development of PRR resistant avocado rootstocks.
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Affiliation(s)
- Noëlani van den Berg
- Department of Biochemistry, Genetics and Microbiology, University of Pretoria, Pretoria, Gauteng, South Africa
- Forestry and Agricultural Biotechnology Institute (FABI), University of Pretoria, Pretoria, Gauteng, South Africa
| | - Waheed Mahomed
- Department of Biochemistry, Genetics and Microbiology, University of Pretoria, Pretoria, Gauteng, South Africa
- Forestry and Agricultural Biotechnology Institute (FABI), University of Pretoria, Pretoria, Gauteng, South Africa
| | - Nicholas A. Olivier
- Forestry and Agricultural Biotechnology Institute (FABI), University of Pretoria, Pretoria, Gauteng, South Africa
- Department of Plant and Soil Sciences, University of Pretoria, Pretoria, Gauteng, South Africa
- African Centre for Gene Technologies Microarray Facility, University of Pretoria, Pretoria, Gauteng, South Africa
| | - Velushka Swart
- Department of Biochemistry, Genetics and Microbiology, University of Pretoria, Pretoria, Gauteng, South Africa
- Forestry and Agricultural Biotechnology Institute (FABI), University of Pretoria, Pretoria, Gauteng, South Africa
| | - Bridget G. Crampton
- Forestry and Agricultural Biotechnology Institute (FABI), University of Pretoria, Pretoria, Gauteng, South Africa
- Department of Plant and Soil Sciences, University of Pretoria, Pretoria, Gauteng, South Africa
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29
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Castilleux R, Plancot B, Ropitaux M, Carreras A, Leprince J, Boulogne I, Follet-Gueye ML, Popper ZA, Driouich A, Vicré M. Cell wall extensins in root-microbe interactions and root secretions. JOURNAL OF EXPERIMENTAL BOTANY 2018; 69:4235-4247. [PMID: 29945246 DOI: 10.1093/jxb/ery238] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2018] [Accepted: 06/18/2018] [Indexed: 05/27/2023]
Abstract
Extensins are cell wall glycoproteins, belonging to the hydroxyproline-rich glycoprotein (HRGP) family, which are involved in many biological functions, including plant growth and defence. Several reviews have described the involvement of HRGPs in plant immunity but little focus has been given specifically to cell wall extensins. Yet, a large set of recently published data indicates that extensins play an important role in plant protection, especially in root-microbe interactions. Here, we summarise the current knowledge on this topic and discuss the importance of extensins in root defence. We first provide an overview of the distribution of extensin epitopes recognised by different monoclonal antibodies among plants and discuss the relevance of some of these epitopes as markers of the root defence response. We also highlight the implication of extensins in different types of plant interactions elicited by either pathogenic or beneficial micro-organisms. We then present and discuss the specific importance of extensins in root secretions, as these glycoproteins are not only found in the cell walls but are also released into the root mucilage. Finally, we propose a model to illustrate the impact of cell wall extensin on root secretions.
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Affiliation(s)
- Romain Castilleux
- Normandie Université, UNIROUEN, Laboratoire Glyco-MEV EA 4358, Fédération de Recherche "Normandie Végétal" FED, Rouen, France
| | - Barbara Plancot
- Normandie Université, UNIROUEN, Laboratoire Glyco-MEV EA 4358, Fédération de Recherche "Normandie Végétal" FED, Rouen, France
| | - Marc Ropitaux
- Normandie Université, UNIROUEN, Laboratoire Glyco-MEV EA 4358, Fédération de Recherche "Normandie Végétal" FED, Rouen, France
| | - Alexis Carreras
- Normandie Université, UNIROUEN, Laboratoire Glyco-MEV EA 4358, Fédération de Recherche "Normandie Végétal" FED, Rouen, France
| | - Jérôme Leprince
- INSERM U1239, Différenciation et Communication Neuronale et Neuroendocrine, Normandie Université, Rouen, France
| | - Isabelle Boulogne
- Normandie Université, UNIROUEN, Laboratoire Glyco-MEV EA 4358, Fédération de Recherche "Normandie Végétal" FED, Rouen, France
| | - Marie-Laure Follet-Gueye
- Normandie Université, UNIROUEN, Laboratoire Glyco-MEV EA 4358, Fédération de Recherche "Normandie Végétal" FED, Rouen, France
| | - Zoë A Popper
- Botany and Plant Science and The Ryan Institute for Environmental, Marine and Energy Research, School of Natural Sciences, National University of Ireland Galway, Galway, Ireland
| | - Azeddine Driouich
- Normandie Université, UNIROUEN, Laboratoire Glyco-MEV EA 4358, Fédération de Recherche "Normandie Végétal" FED, Rouen, France
| | - Maïté Vicré
- Normandie Université, UNIROUEN, Laboratoire Glyco-MEV EA 4358, Fédération de Recherche "Normandie Végétal" FED, Rouen, France
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30
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Fan G, Yang Y, Li T, Lu W, Du Y, Qiang X, Wen Q, Shan W. A Phytophthora capsici RXLR Effector Targets and Inhibits a Plant PPIase to Suppress Endoplasmic Reticulum-Mediated Immunity. MOLECULAR PLANT 2018; 11:1067-1083. [PMID: 29864524 DOI: 10.1016/j.molp.2018.05.009] [Citation(s) in RCA: 67] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2017] [Revised: 05/25/2018] [Accepted: 05/27/2018] [Indexed: 05/20/2023]
Abstract
Phytophthora pathogens secrete a large arsenal of effectors that manipulate host processes to create an environment conducive to pathogen colonization. However, the underlying mechanisms by which Phytophthora effectors manipulate host plant cells still remain largely unclear. In this study, we report that PcAvr3a12, a Phytophthora capsici RXLR effector and a member of the Avr3a effector family, suppresses plant immunity by targeting and inhibiting host plant peptidyl-prolyl cis-trans isomerase (PPIase). Overexpression of PcAvr3a12 in Arabidopsis thaliana enhanced plant susceptibility to P. capsici. FKBP15-2, an endoplasmic reticulum (ER)-localized protein, was identified as a host target of PcAvr3a12 during early P. capsici infection. Analyses of A. thaliana T-DNA insertion mutant (fkbp15-2), RNAi, and overexpression lines consistently showed that FKBP15-2 positively regulates plant immunity in response to Phytophthora infection. FKBP15-2 possesses PPIase activity essential for its contribution to immunity but is directly suppressed by PcAvr3a12. Interestingly, we found that FKBP15-2 is involved in ER stress sensing and is required for ER stress-mediated plant immunity. Taken together, these results suggest that P. capsici deploys an RXLR effector, PcAvr3a12, to facilitate infection by targeting and suppressing a novel ER-localized PPIase, FKBP15-2, which is required for ER stress-mediated plant immunity.
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Affiliation(s)
- Guangjin Fan
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Plant Protection, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Yang Yang
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Agronomy, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Tingting Li
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Agronomy, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Wenqin Lu
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Plant Protection, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Yu Du
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Horticulture, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Xiaoyu Qiang
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Agronomy, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Qujiang Wen
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Plant Protection, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Weixing Shan
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Agronomy, Northwest A&F University, Yangling, Shaanxi 712100, China.
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31
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Dalio RJD, Máximo HJ, Oliveira TS, Azevedo TDM, Felizatti HL, Campos MDA, Machado MA. Molecular Basis of Citrus sunki Susceptibility and Poncirus trifoliata Resistance Upon Phytophthora parasitica Attack. MOLECULAR PLANT-MICROBE INTERACTIONS : MPMI 2018; 31:386-398. [PMID: 29125028 DOI: 10.1094/mpmi-05-17-0112-fi] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Coevolution has shaped the molecular basis of an extensive number of defense mechanisms in plant-pathogen interactions. Phytophthora parasitica, a hemibiothrophic oomycete pathogen and the causal agent of citrus root rot and gummosis, interacts differently with Citrus sunki and Poncirus trifoliata, two commonly favored citrus rootstocks that are recognized as susceptible and resistant, respectively, to P. parasitica. The molecular core of these interactions remains elusive. Here, we provide evidence on the defense strategies employed by both susceptible and resistant citrus rootstocks, in parallel with P. parasitica deployment of effectors. Time course expression analysis (quantitative real-time polymerase chain reaction) of several defense-related genes were evaluated during i) plant disease development, ii) necrosis, and iii) pathogen effector gene expression. In C. sunki, P. parasitica deploys effectors, including elicitins, NPP1 (necrosis-inducing Phytophthora protein 1), CBEL (cellulose-binding elicitor and lectin activity), RxLR, and CRN (crinkler), and, consequently, this susceptible plant activates its main defense signaling pathways that result in the hypersensitive response and necrosis. Despite the strong plant-defense response, it fails to withstand P. parasitica invasion, confirming its hemibiothrophic lifestyle. In Poncirus trifoliata, the effectors were strongly expressed, nevertheless failing to induce any immunity manipulation and disease development, suggesting a nonhost resistance type, in which the plant relies on preformed biochemical and anatomical barriers.
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Affiliation(s)
| | - Heros José Máximo
- 1 Biotechnology Lab, Centro de Citricultura Sylvio Moreira. Cordeirópolis-SP, Brazil
| | - Tiago Silva Oliveira
- 1 Biotechnology Lab, Centro de Citricultura Sylvio Moreira. Cordeirópolis-SP, Brazil
| | | | - Henrique Leme Felizatti
- 2 Instituto de Matemática, Estatística e Computação Científica, Universidade de Campinas, Campinas-SP, Brazil; and
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Chuberre C, Plancot B, Driouich A, Moore JP, Bardor M, Gügi B, Vicré M. Plant Immunity Is Compartmentalized and Specialized in Roots. FRONTIERS IN PLANT SCIENCE 2018; 9:1692. [PMID: 30546372 PMCID: PMC6279857 DOI: 10.3389/fpls.2018.01692] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2018] [Accepted: 10/31/2018] [Indexed: 05/21/2023]
Abstract
Roots are important organs for plant survival. In recent years, clear differences between roots and shoots in their respective plant defense strategies have been highlighted. Some putative gene markers of defense responses usually used in leaves are less relevant in roots and are sometimes not even expressed. Immune responses in roots appear to be tissue-specific suggesting a compartmentalization of defense mechanisms in root systems. Furthermore, roots are able to activate specific defense mechanisms in response to various elicitors including Molecular/Pathogen Associated Molecular Patterns, (MAMPs/PAMPs), signal compounds (e.g., hormones) and plant defense activator (e.g., β-aminobutyric acid, BABA). This review discusses recent findings in root defense mechanisms and illustrates the necessity to discover new root specific biomarkers. The development of new strategies to control root disease and improve crop quality will also be reviewed.
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Affiliation(s)
- Coralie Chuberre
- Normandie Univ, UNIROUEN, Laboratoire Glycobiologie et Matrice Extracellulaire Végétale EA4358, Rouen, France
- Fédération de Recherche “NORVEGE”- FED 4277, Rouen, France
| | - Barbara Plancot
- Normandie Univ, UNIROUEN, Laboratoire Glycobiologie et Matrice Extracellulaire Végétale EA4358, Rouen, France
- Fédération de Recherche “NORVEGE”- FED 4277, Rouen, France
| | - Azeddine Driouich
- Normandie Univ, UNIROUEN, Laboratoire Glycobiologie et Matrice Extracellulaire Végétale EA4358, Rouen, France
- Fédération de Recherche “NORVEGE”- FED 4277, Rouen, France
| | - John P. Moore
- Department of Viticulture and Oenology, Faculty of AgriSciences, Institute for Wine Biotechnology, Stellenbosch University, Matieland, South Africa
| | - Muriel Bardor
- Normandie Univ, UNIROUEN, Laboratoire Glycobiologie et Matrice Extracellulaire Végétale EA4358, Rouen, France
- Fédération de Recherche “NORVEGE”- FED 4277, Rouen, France
- Institut Universitaire de France, Paris, France
| | - Bruno Gügi
- Normandie Univ, UNIROUEN, Laboratoire Glycobiologie et Matrice Extracellulaire Végétale EA4358, Rouen, France
- Fédération de Recherche “NORVEGE”- FED 4277, Rouen, France
- *Correspondence: Bruno Gügi, Maïté Vicré,
| | - Maïté Vicré
- Normandie Univ, UNIROUEN, Laboratoire Glycobiologie et Matrice Extracellulaire Végétale EA4358, Rouen, France
- Fédération de Recherche “NORVEGE”- FED 4277, Rouen, France
- *Correspondence: Bruno Gügi, Maïté Vicré,
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Le Berre JY, Gourgues M, Samans B, Keller H, Panabières F, Attard A. Transcriptome dynamic of Arabidopsis roots infected with Phytophthora parasitica identifies VQ29, a gene induced during the penetration and involved in the restriction of infection. PLoS One 2017; 12:e0190341. [PMID: 29281727 PMCID: PMC5744986 DOI: 10.1371/journal.pone.0190341] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2017] [Accepted: 12/13/2017] [Indexed: 12/30/2022] Open
Abstract
Little is known about the responses of plant roots to filamentous pathogens, particularly to oomycetes. To assess the molecular dialog established between the host and the pathogen during early stages of infection, we investigated the overall changes in gene expression in A. thaliana roots challenged with P. parasitica. We analyzed various infection stages, from penetration and establishment of the interaction to the switch from biotrophy to necrotrophy. We identified 3390 genes for which expression was modulated during the infection. The A. thaliana transcriptome displays a dynamic response to P. parasitica infection, from penetration onwards. Some genes were specifically coregulated during penetration and biotrophic growth of the pathogen. Many of these genes have functions relating to primary metabolism, plant growth, and defense responses. In addition, many genes encoding VQ motif-containing proteins were found to be upregulated in plant roots, early in infection. Inactivation of VQ29 gene significantly increased susceptibility to P. parasitica during the late stages of infection. This finding suggests that the gene contributes to restricting oomycete development within plant tissues. Furthermore, the vq29 mutant phenotype was not associated with an impairment of plant defenses involving SA-, JA-, and ET-dependent signaling pathways, camalexin biosynthesis, or PTI signaling. Collectively, the data presented here thus show that infection triggers a specific genetic program in roots, beginning as soon as the pathogen penetrates the first cells.
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Affiliation(s)
| | | | - Birgit Samans
- Department of Plant Breeding, Institute of Agronomy and Plant Breeding, Giessen, Germany
| | | | | | - Agnes Attard
- INRA, Université Côte d'Azur, CNRS, ISA, France
- * E-mail:
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Kong P, McDowell JM, Hong C. Zoospore exudates from Phytophthora nicotianae affect immune responses in Arabidopsis. PLoS One 2017; 12:e0180523. [PMID: 28662148 PMCID: PMC5491255 DOI: 10.1371/journal.pone.0180523] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2017] [Accepted: 06/17/2017] [Indexed: 11/19/2022] Open
Abstract
Zoospore exudates play important roles in promoting zoospore communication, homing and germination during plant infection by Phytophthora. However, it is not clear whether exudates affect plant immunity. Zoospore-free fluid (ZFF) and zoospores of P. nicotianae were investigated comparatively for effects on resistance of Arabidopsis thaliana Col-0 and mutants that affect signaling mediated by salicylic acid (SA) and jasmonic acid (JA): eds16 (enhanced disease susceptibility16), pad4 (phytoalexin deficient4), and npr1 (nonexpressor of pathogenesis-related genes1). Col-0 attracted more zoospores and had severe tissue damage when flooded with a zoospore suspension in ZFF. Mutants treated with ZFF alone developed disease symptoms similar to those inoculated with zoospores and requirements of EDS16 and PAD4 for plant responses to zoospores and the exudates was apparent. Zoospore and ZFFs also induced expression of the PR1 and PDF1.2 marker genes for defense regulated by SA and JA, respectively. However, ZFF affected more JA defense signaling, down regulating PR1 when SA signaling or synthesis is deficient, which may be responsible for Arabidopsis mutant plants more susceptible to infection by high concentration of P. nicotianae zoospores. These results suggest that zoospore exudates can function as virulence factors and inducers of plant immune responses during plant infection by Phytophthora.
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Affiliation(s)
- Ping Kong
- Hampton Roads Agricultural Research and Extension Center, Virginia Tech, Virginia Beach, Virginia, United States of America
- * E-mail:
| | - John M. McDowell
- Department of Plant Pathology, Physiology and Weed Science, Virginia Tech, Blacksburg, Virginia, United States of America
| | - Chuanxue Hong
- Hampton Roads Agricultural Research and Extension Center, Virginia Tech, Virginia Beach, Virginia, United States of America
- Department of Plant Pathology, Physiology and Weed Science, Virginia Tech, Blacksburg, Virginia, United States of America
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Evangelisti E, Gogleva A, Hainaux T, Doumane M, Tulin F, Quan C, Yunusov T, Floch K, Schornack S. Time-resolved dual transcriptomics reveal early induced Nicotiana benthamiana root genes and conserved infection-promoting Phytophthora palmivora effectors. BMC Biol 2017; 15:39. [PMID: 28494759 PMCID: PMC5427549 DOI: 10.1186/s12915-017-0379-1] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2017] [Accepted: 04/24/2017] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Plant-pathogenic oomycetes are responsible for economically important losses in crops worldwide. Phytophthora palmivora, a tropical relative of the potato late blight pathogen, causes rotting diseases in many tropical crops including papaya, cocoa, oil palm, black pepper, rubber, coconut, durian, mango, cassava and citrus. Transcriptomics have helped to identify repertoires of host-translocated microbial effector proteins which counteract defenses and reprogram the host in support of infection. As such, these studies have helped in understanding how pathogens cause diseases. Despite the importance of P. palmivora diseases, genetic resources to allow for disease resistance breeding and identification of microbial effectors are scarce. RESULTS We employed the model plant Nicotiana benthamiana to study the P. palmivora root infections at the cellular and molecular levels. Time-resolved dual transcriptomics revealed different pathogen and host transcriptome dynamics. De novo assembly of P. palmivora transcriptome and semi-automated prediction and annotation of the secretome enabled robust identification of conserved infection-promoting effectors. We show that one of them, REX3, suppresses plant secretion processes. In a survey for early transcriptionally activated plant genes we identified a N. benthamiana gene specifically induced at infected root tips that encodes a peptide with danger-associated molecular features. CONCLUSIONS These results constitute a major advance in our understanding of P. palmivora diseases and establish extensive resources for P. palmivora pathogenomics, effector-aided resistance breeding and the generation of induced resistance to Phytophthora root infections. Furthermore, our approach to find infection-relevant secreted genes is transferable to other pathogen-host interactions and not restricted to plants.
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Affiliation(s)
| | - Anna Gogleva
- Sainsbury Laboratory Cambridge University (SLCU), Cambridge, UK
| | - Thomas Hainaux
- Sainsbury Laboratory Cambridge University (SLCU), Cambridge, UK
- Present address: Université Libre de Bruxelles, Bruxelles, Belgium
| | - Mehdi Doumane
- Sainsbury Laboratory Cambridge University (SLCU), Cambridge, UK
- Present address: École Normale Supérieure de Lyon, Lyon, France
| | - Frej Tulin
- Sainsbury Laboratory Cambridge University (SLCU), Cambridge, UK
| | - Clément Quan
- Sainsbury Laboratory Cambridge University (SLCU), Cambridge, UK
| | - Temur Yunusov
- Sainsbury Laboratory Cambridge University (SLCU), Cambridge, UK
| | - Kévin Floch
- Sainsbury Laboratory Cambridge University (SLCU), Cambridge, UK
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Jia J, Lu W, Zhong C, Zhou R, Xu J, Liu W, Gou X, Wang Q, Yin J, Xu C, Shan W. The 25-26 nt Small RNAs in Phytophthora parasitica Are Associated with Efficient Silencing of Homologous Endogenous Genes. Front Microbiol 2017; 8:773. [PMID: 28512457 PMCID: PMC5411455 DOI: 10.3389/fmicb.2017.00773] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2017] [Accepted: 04/13/2017] [Indexed: 02/01/2023] Open
Abstract
Small RNAs (sRNAs) are important non-coding RNA regulators, playing key roles in developmental regulation, transposon suppression, environmental response, host-pathogen interaction and other diverse biological processes. However, their roles in oomycetes are poorly understood. Here, we performed sRNA sequencing and RNA sequencing of Phytophthora parasitica at stages of vegetative growth and infection of Arabidopsis roots to examine diversity and function of sRNAs in P. parasitica, a model hemibiotrophic oomycete plant pathogen. Our results indicate that there are two distinct types of sRNA-generating loci in P. parasitica genome, giving rise to clusters of 25-26 nt and 21 nt sRNAs, respectively, with no significant strand-biases. The 25-26 nt sRNA loci lie predominantly in gene-sparse and repeat-rich regions, and overlap with over 7000 endogenous gene loci. These overlapped genes are typically P. parasitica species-specific, with no homologies to the sister species P. infestans. They include approximately 40% RXLR effector genes, 50% CRN effector genes and some elicitor genes. The transcripts of most of these genes could not be detected at both the vegetative mycelium and infection stages as revealed by RNA sequencing, indicating that the 25-26 nt sRNAs are associated with efficient silencing of these genes. The 21 nt sRNA loci typically overlap with the exon regions of highly expressed genes, suggesting that the biogenesis of the 21 nt sRNAs may be dependent on the level of gene transcription and that these sRNAs do not mediate efficient silencing of homologous genes. Analyses of the published P. infestans sRNA and mRNA sequencing data consistently show that the 25-26 nt sRNAs, but not the 21 nt sRNAs, may mediate efficient gene silencing in Phytophthora.
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Affiliation(s)
- Jinbu Jia
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Plant Protection, Northwest A&F UniversityYangling, China
| | - Wenqin Lu
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Plant Protection, Northwest A&F UniversityYangling, China
| | - Chengcheng Zhong
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Plant Protection, Northwest A&F UniversityYangling, China
| | - Ran Zhou
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Plant Protection, Northwest A&F UniversityYangling, China
| | - Junjie Xu
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Plant Protection, Northwest A&F UniversityYangling, China
| | - Wei Liu
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Plant Protection, Northwest A&F UniversityYangling, China
| | - Xiuhong Gou
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Plant Protection, Northwest A&F UniversityYangling, China
| | - Qinhu Wang
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Plant Protection, Northwest A&F UniversityYangling, China
| | - Junliang Yin
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Plant Protection, Northwest A&F UniversityYangling, China
| | - Cheng Xu
- Chongqing Tobacco Research InstituteChongqing, China
| | - Weixing Shan
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Plant Protection, Northwest A&F UniversityYangling, China.,State Key Laboratory of Crop Stress Biology for Arid Areas and College of Agronomy, Northwest A&F UniversityYangling, China
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Koroney AS, Plasson C, Pawlak B, Sidikou R, Driouich A, Menu-Bouaouiche L, Vicré-Gibouin M. Root exudate of Solanum tuberosum is enriched in galactose-containing molecules and impacts the growth of Pectobacterium atrosepticum. ANNALS OF BOTANY 2016; 118:797-808. [PMID: 27390353 PMCID: PMC5055634 DOI: 10.1093/aob/mcw128] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/21/2016] [Revised: 04/06/2016] [Accepted: 05/16/2016] [Indexed: 05/21/2023]
Abstract
Background and aims Potato (Solanum tuberosum) is an important food crop and is grown worldwide. It is, however, significantly sensitive to a number of soil-borne pathogens that affect roots and tubers, causing considerable economic losses. So far, most research on potato has been dedicated to tubers and hence little attention has been paid to root structure and function. Methods In the present study we characterized root border cells using histochemical staining, immunofluorescence labelling of cell wall polysaccharides epitopes and observation using laser confocal microscopy. The monosaccharide composition of the secreted exudates was determined by gas chromatography of trimethylsilyl methylglycoside derivatives. The effects of root exudates and secreted arabinogalactan proteins on bacterial growth were investigated using in vitro bioassays. Key Results Root exudate from S. tuberosum was highly enriched in galactose-containing molecules including arabinogalactan proteins as major components. Treatment of the root with an elicitor derived from Pectobacterium atrosepticum, a soil-borne pathogen of potato, altered the composition of the exudates and arabinogalactan proteins. We found that the growth of the bacterium in vitro was differentially affected by exudates from elicited and non-elicited roots (i.e. inhibition versus stimulation). Conclusions Taken together, these findings indicate that galactose-containing polymers of potato root exudates play a central role in root-microbe interactions.
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Affiliation(s)
- Abdoul Salam Koroney
- Laboratoire Glycobiologie et Matrice Extracellulaire Végétale (EA 4358), Grand Réseau de Recherche VASI ‘Végétal-Agronomie-Sol et Innovations’ et Plate-Forme d’Imagerie Cellulaire (PRIMACEN) de Haute-Normandie, Normandie Université, Université de Rouen, 76821 Mont Saint Aignan Cedex, France
| | - Carole Plasson
- Laboratoire Glycobiologie et Matrice Extracellulaire Végétale (EA 4358), Grand Réseau de Recherche VASI ‘Végétal-Agronomie-Sol et Innovations’ et Plate-Forme d’Imagerie Cellulaire (PRIMACEN) de Haute-Normandie, Normandie Université, Université de Rouen, 76821 Mont Saint Aignan Cedex, France
| | - Barbara Pawlak
- Laboratoire de Microbiologie Signaux Microenvironnement EA 4312, Normandie Université, Université de Rouen, 76821 Mont Saint Aignan Cedex, France
| | - Ramatou Sidikou
- Faculté des Sciences, Université A.M. de Niamey, B.P. 12022 Niamey, Niger
| | - Azeddine Driouich
- Laboratoire Glycobiologie et Matrice Extracellulaire Végétale (EA 4358), Grand Réseau de Recherche VASI ‘Végétal-Agronomie-Sol et Innovations’ et Plate-Forme d’Imagerie Cellulaire (PRIMACEN) de Haute-Normandie, Normandie Université, Université de Rouen, 76821 Mont Saint Aignan Cedex, France
| | - Laurence Menu-Bouaouiche
- Laboratoire Glycobiologie et Matrice Extracellulaire Végétale (EA 4358), Grand Réseau de Recherche VASI ‘Végétal-Agronomie-Sol et Innovations’ et Plate-Forme d’Imagerie Cellulaire (PRIMACEN) de Haute-Normandie, Normandie Université, Université de Rouen, 76821 Mont Saint Aignan Cedex, France
| | - Maïté Vicré-Gibouin
- Laboratoire Glycobiologie et Matrice Extracellulaire Végétale (EA 4358), Grand Réseau de Recherche VASI ‘Végétal-Agronomie-Sol et Innovations’ et Plate-Forme d’Imagerie Cellulaire (PRIMACEN) de Haute-Normandie, Normandie Université, Université de Rouen, 76821 Mont Saint Aignan Cedex, France
- *For correspondence. E-mail
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Sahu R, Sharaff M, Pradhan M, Sethi A, Bandyopadhyay T, Mishra VK, Chand R, Chowdhury AK, Joshi AK, Pandey SP. Elucidation of defense-related signaling responses to spot blotch infection in bread wheat (Triticum aestivum L.). THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2016; 86:35-49. [PMID: 26932764 DOI: 10.1111/tpj.13149] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2015] [Revised: 02/13/2016] [Accepted: 02/15/2016] [Indexed: 05/20/2023]
Abstract
Spot blotch disease, caused by Bipolaris sorokiniana, is an important threat to wheat, causing an annual loss of ~17%. Under epidemic conditions, these losses may be 100%, yet the molecular responses of wheat to spot blotch remain almost uncharacterized. Moreover, defense-related phytohormone signaling genes have been poorly characterized in wheat. Here, we have identified 18 central components of salicylic acid (SA), jasmonic acid (JA), ethylene (ET), and enhanced disease susceptibility 1 (EDS1) signaling pathways as well as the genes of the phenylpropanoid pathway in wheat. In time-course experiments, we characterized the reprogramming of expression of these pathways in two contrasting genotypes: Yangmai #6 (resistant to spot blotch) and Sonalika (susceptible to spot blotch). We further evaluated the performance of a population of recombinant inbred lines (RILs) by crossing Yangmai#6 and Sonalika (parents) and subsequent selfing to F10 under field conditions in trials at multiple locations. We characterized the reprogramming of defense-related signaling in these RILs as a consequence of spot blotch attack. During resistance to spot blotch attack, wheat strongly elicits SA signaling (SA biogenesis as well as the NPR1-dependent signaling pathway), along with WRKY33 transcription factor, followed by an enhanced expression of phenylpropanoid pathway genes. These may lead to accumulation of phenolics-based defense metabolites that may render resistance against spot blotch. JA signaling may synergistically contribute to the resistance. Failure to elicit SA (and possibly JA) signaling may lead to susceptibility against spot blotch infection in wheat.
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Affiliation(s)
- Ranabir Sahu
- Department of Biological Sciences, Indian Institute of Science Education and Research - Kolkata, Mohanpur Campus, Mohanpur, 741246, West Bengal, India
| | - Murali Sharaff
- Department of Biological Sciences, Indian Institute of Science Education and Research - Kolkata, Mohanpur Campus, Mohanpur, 741246, West Bengal, India
| | - Maitree Pradhan
- Department of Biological Sciences, Indian Institute of Science Education and Research - Kolkata, Mohanpur Campus, Mohanpur, 741246, West Bengal, India
| | - Avinash Sethi
- Department of Biological Sciences, Indian Institute of Science Education and Research - Kolkata, Mohanpur Campus, Mohanpur, 741246, West Bengal, India
| | - Tirthankar Bandyopadhyay
- Department of Biological Sciences, Indian Institute of Science Education and Research - Kolkata, Mohanpur Campus, Mohanpur, 741246, West Bengal, India
| | - Vinod K Mishra
- Department of Genetics and Plant Breeding, Institute of Agricultural Sciences, Banaras Hindu University, Varanasi, 22105, India
| | - Ramesh Chand
- Department of Plant Pathology, Institute of Agricultural Sciences, Banaras Hindu University, Varanasi, 22105, India
| | - Apurba K Chowdhury
- Uttar Banga Krishi Viswavidyalaya, Cooch Behar, Varanasi, 736165, West Bengal, India
| | - Arun K Joshi
- Department of Genetics and Plant Breeding, Institute of Agricultural Sciences, Banaras Hindu University, Varanasi, 22105, India
- The International Maize and Wheat Improvement Center (CIMMYT) South Asia Office, Singh Durbar Plaza Marg, Kathmandu, Nepal
| | - Shree P Pandey
- Department of Biological Sciences, Indian Institute of Science Education and Research - Kolkata, Mohanpur Campus, Mohanpur, 741246, West Bengal, India
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Meyer FE, Shuey LS, Naidoo S, Mamni T, Berger DK, Myburg AA, van den Berg N, Naidoo S. Dual RNA-Sequencing of Eucalyptus nitens during Phytophthora cinnamomi Challenge Reveals Pathogen and Host Factors Influencing Compatibility. FRONTIERS IN PLANT SCIENCE 2016; 7:191. [PMID: 26973660 PMCID: PMC4773608 DOI: 10.3389/fpls.2016.00191] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/26/2015] [Accepted: 02/04/2016] [Indexed: 05/18/2023]
Abstract
Damage caused by Phytophthora cinnamomi Rands remains an important concern on forest tree species. The pathogen causes root and collar rot, stem cankers, and dieback of various economically important Eucalyptus spp. In South Africa, susceptible cold tolerant Eucalyptus plantations have been affected by various Phytophthora spp. with P. cinnamomi considered one of the most virulent. The molecular basis of this compatible interaction is poorly understood. In this study, susceptible Eucalyptus nitens plants were stem inoculated with P. cinnamomi and tissue was harvested five days post inoculation. Dual RNA-sequencing, a technique which allows the concurrent detection of both pathogen and host transcripts during infection, was performed. Approximately 1% of the reads mapped to the draft genome of P. cinnamomi while 78% of the reads mapped to the Eucalyptus grandis genome. The highest expressed P. cinnamomi gene in planta was a putative crinkler effector (CRN1). Phylogenetic analysis indicated the high similarity of this P. cinnamomi CRN1 to that of Phytophthora infestans. Some CRN effectors are known to target host nuclei to suppress defense. In the host, over 1400 genes were significantly differentially expressed in comparison to mock inoculated trees, including suites of pathogenesis related (PR) genes. In particular, a PR-9 peroxidase gene with a high similarity to a Carica papaya PR-9 ortholog previously shown to be suppressed upon infection by Phytophthora palmivora was down-regulated two-fold. This PR-9 gene may represent a cross-species effector target during P. cinnamomi infection. This study identified pathogenicity factors, potential manipulation targets, and attempted host defense mechanisms activated by E. nitens that contributed to the susceptible outcome of the interaction.
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Affiliation(s)
- Febé E. Meyer
- Department of Genetics, Forestry and Agricultural Biotechnology Institute, Genomics Research Institute, University of PretoriaPretoria, South Africa
| | - Louise S. Shuey
- Department of Genetics, Forestry and Agricultural Biotechnology Institute, Genomics Research Institute, University of PretoriaPretoria, South Africa
| | - Sitha Naidoo
- Department of Genetics, Forestry and Agricultural Biotechnology Institute, Genomics Research Institute, University of PretoriaPretoria, South Africa
| | - Thandekile Mamni
- Department of Genetics, Forestry and Agricultural Biotechnology Institute, Genomics Research Institute, University of PretoriaPretoria, South Africa
| | - Dave K. Berger
- Department of Plant Science, Forestry and Agricultural Biotechnology Institute, Genomics Research Institute, University of PretoriaPretoria, South Africa
| | - Alexander A. Myburg
- Department of Genetics, Forestry and Agricultural Biotechnology Institute, Genomics Research Institute, University of PretoriaPretoria, South Africa
| | - Noëlani van den Berg
- Department of Genetics, Forestry and Agricultural Biotechnology Institute, Genomics Research Institute, University of PretoriaPretoria, South Africa
| | - Sanushka Naidoo
- Department of Genetics, Forestry and Agricultural Biotechnology Institute, Genomics Research Institute, University of PretoriaPretoria, South Africa
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Pan Q, Cui B, Deng F, Quan J, Loake GJ, Shan W. RTP1 encodes a novel endoplasmic reticulum (ER)-localized protein in Arabidopsis and negatively regulates resistance against biotrophic pathogens. THE NEW PHYTOLOGIST 2016; 209:1641-54. [PMID: 26484750 DOI: 10.1111/nph.13707] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2015] [Accepted: 09/14/2015] [Indexed: 05/06/2023]
Abstract
Oomycete pathogens cause serious damage to a wide spectrum of plants. Although host pathogen recognition via pathogen effectors and cognate plant resistance proteins is well established, the genetic basis of host factors that mediate plant susceptibility to oomycete pathogens is relatively unexplored. Here, we report on RTP1, a nodulin-related MtN21 family gene in Arabidopsis that mediates susceptibility to Phytophthora parasitica. RTP1 was identified by screening a T-DNA insertion mutant population and encoded an endoplasmic reticulum (ER)-localized protein. Overexpression of RTP1 rendered Arabidopsis more susceptible, whereas RNA silencing of RTP1 led to enhanced resistance to P. parasitica. Moreover, an RTP1 mutant, rtp1-1, displayed localized cell death, increased reactive oxygen species (ROS) production and accelerated PR1 expression, compared to the wild-type Col-0, in response to P. parasitica infection. rtp1-1 showed a similar disease response to the bacterial pathogen Pseudomonas syringae pv. tomato (Pst) DC3000, including increased disease resistance, cell death and ROS production. Furthermore, rpt1-1 exhibited resistance to the fungal pathogen Golovinomyces cichoracearum, but not to the necrotrophic pathogen Botrytis cinerea. Taken together, these results suggest that RTP1 negatively regulates plant resistance to biotrophic pathogens, possibly by regulating ROS production, cell death progression and PR1 expression.
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Affiliation(s)
- Qiaona Pan
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Life Sciences, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Beimi Cui
- Institute of Molecular Plant Sciences, School of Biological Sciences, University of Edinburgh, Edinburgh, EH9 3JH, UK
| | - Fengyan Deng
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Life Sciences, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Junli Quan
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Plant Protection, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Gary J Loake
- Institute of Molecular Plant Sciences, School of Biological Sciences, University of Edinburgh, Edinburgh, EH9 3JH, UK
| | - Weixing Shan
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Plant Protection, Northwest A&F University, Yangling, Shaanxi, 712100, China
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Lemarié S, Robert-Seilaniantz A, Lariagon C, Lemoine J, Marnet N, Jubault M, Manzanares-Dauleux MJ, Gravot A. Both the Jasmonic Acid and the Salicylic Acid Pathways Contribute to Resistance to the Biotrophic Clubroot Agent Plasmodiophora brassicae in Arabidopsis. PLANT & CELL PHYSIOLOGY 2015; 56:2158-68. [PMID: 26363358 DOI: 10.1093/pcp/pcv127] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2015] [Accepted: 09/02/2015] [Indexed: 05/18/2023]
Abstract
The role of salicylic acid (SA) and jasmonic acid (JA) signaling in resistance to root pathogens has been poorly documented. We assessed the contribution of SA and JA to basal and partial resistance of Arabidopsis to the biotrophic clubroot agent Plasmodiophora brassicae. SA and JA levels as well as the expression of the SA-responsive genes PR2 and PR5 and the JA-responsive genes ARGAH2 and THI2.1 were monitored in infected roots of the accessions Col-0 (susceptible) and Bur-0 (partially resistant). SA signaling was activated in Bur-0 but not in Col-0. The JA pathway was weakly activated in Bur-0 but was strongly induced in Col-0. The contribution of both pathways to clubroot resistance was then assessed using exogenous phytohormone application and mutants affected in SA or JA signaling. Exogenous SA treatment decreased clubroot symptoms in the two Arabidopsis accessions, whereas JA treatment reduced clubroot symptoms only in Col-0. The cpr5-2 mutant, in which SA responses are constitutively induced, was more resistant to clubroot than the corresponding wild type, and the JA signaling-deficient mutant jar1 was more susceptible. Finally, we showed that the JA-mediated induction of NATA1 drove N(δ)-acetylornithine biosynthesis in infected Col-0 roots. The 35S::NATA1 and nata1 lines displayed reduced or enhanced clubroot symptoms, respectively, thus suggesting that in Col-0 this pathway was involved in the JA-mediated basal clubroot resistance. Overall, our data support the idea that, depending on the Arabidopsis accession, both SA and JA signaling can play a role in partial inhibition of clubroot development in compatible interactions with P. brassicae.
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Affiliation(s)
| | | | | | | | - Nathalie Marnet
- Plateau de Profilage Métabolique et Métabolomique (P2M2) Centre de Recherche Angers Nantes BIA, INRA de Rennes, F-35653 Le Rheu, France
| | | | | | - Antoine Gravot
- Université Rennes 1, UMR1349 IGEPP, F-35000 Rennes, France
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Wang Y, Cordewener JHG, America AHP, Shan W, Bouwmeester K, Govers F. Arabidopsis Lectin Receptor Kinases LecRK-IX.1 and LecRK-IX.2 Are Functional Analogs in Regulating Phytophthora Resistance and Plant Cell Death. MOLECULAR PLANT-MICROBE INTERACTIONS : MPMI 2015; 28:1032-1048. [PMID: 26011556 DOI: 10.1094/mpmi-02-15-0025-r] [Citation(s) in RCA: 58] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
L-type lectin receptor kinases (LecRK) are potential immune receptors. Here, we characterized two closely-related Arabidopsis LecRK, LecRK-IX.1 and LecRK-IX.2, of which T-DNA insertion mutants showed compromised resistance to Phytophthora brassicae and Phytophthora capsici, with double mutants showing additive susceptibility. Overexpression of LecRK-IX.1 or LecRK-IX.2 in Arabidopsis and transient expression in Nicotiana benthamiana increased Phytophthora resistance but also induced cell death. Phytophthora resistance required both the lectin domain and kinase activity, but for cell death, the lectin domain was not needed. Silencing of the two closely related mitogen-activated protein kinase genes NbSIPK and NbNTF4 in N. benthamiana completely abolished LecRK-IX.1-induced cell death but not Phytophthora resistance. Liquid chromatography-mass spectrometry analysis of protein complexes coimmunoprecipitated in planta with LecRK-IX.1 or LecRK-IX.2 as bait, resulted in the identification of the N. benthamiana ABC transporter NbPDR1 as a potential interactor of both LecRK. The closest homolog of NbPDR1 in Arabidopsis is ABCG40, and coimmunoprecipitation experiments showed that ABCG40 associates with LecRK-IX.1 and LecRK-IX.2 in planta. Similar to the LecRK mutants, ABCG40 mutants showed compromised Phytophthora resistance. This study shows that LecRK-IX.1 and LecRK-IX.2 are Phytophthora resistance components that function independent of each other and independent of the cell-death phenotype. They both interact with the same ABC transporter, suggesting that they exploit similar signal transduction pathways.
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Affiliation(s)
- Yan Wang
- 1 Laboratory of Phytopathology, Plant Sciences Group, Wageningen University, Wageningen, The Netherlands
| | | | | | - Weixing Shan
- 3 State Key Laboratory of Crop Stress Biology for Arid Areas, Northwest A&F University, Yangling, P. R. China
| | - Klaas Bouwmeester
- 1 Laboratory of Phytopathology, Plant Sciences Group, Wageningen University, Wageningen, The Netherlands
- 4 Plant-Microbe Interactions, Department of Biology, Faculty of Science, Utrecht University, Utrecht, The Netherlands
| | - Francine Govers
- 1 Laboratory of Phytopathology, Plant Sciences Group, Wageningen University, Wageningen, The Netherlands
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Meng Y, Zhang Q, Zhang M, Gu B, Huang G, Wang Q, Shan W. The protein disulfide isomerase 1 of Phytophthora parasitica (PpPDI1) is associated with the haustoria-like structures and contributes to plant infection. FRONTIERS IN PLANT SCIENCE 2015; 6:632. [PMID: 26347756 PMCID: PMC4539480 DOI: 10.3389/fpls.2015.00632] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2015] [Accepted: 07/30/2015] [Indexed: 05/23/2023]
Abstract
Protein disulfide isomerase (PDI) is a ubiquitous and multifunction enzyme belonging to the thioredoxin (TRX) superfamily, which can reduce, oxidize, and catalyze dithiol-disulfide exchange reactions. Other than performing housekeeping functions in helping to maintain proteins in a more stable conformation, there is some evidence to indicate that PDI is involved in pathogen infection processes. In a high-throughput screening for necrosis-inducing factors by Agrobacterium tumefaciens-mediated transient expression assay, a typical PDI gene from Phytophthora parasitica (PpPDI1) was identified and confirmed to induce strong cell death in Nicotiana benthamiana leaves. PpPDI1 is conserved in eukaryotes but predicted to be a secreted protein. Deletion mutant analyses showed that the first CGHC motif in the active domain of PpPDI1 is essential for inducing cell death. Using P. parasitica transformation method, the silencing efficiency was found to be very low, suggesting that PpPDI1 is essential for the pathogen. Translational fusion to the enhanced green fluorescent protein (EGFP) in stable P. parasitica transformants showed that PpPDI1 is associated with haustoria-like structures during pathogen infection. Furthermore, the PpPDI1-EGFP-expressing transformants increase the number of haustoria-like structures and exhibit enhanced virulence to N. benthamiana. These results indicate that PpPDI1 might be a virulence factor of P. parasitica and contributes to plant infection.
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Affiliation(s)
- Yuling Meng
- College of Plant Protection, Northwest A&F UniversityYangling, China
- State Key Laboratory of Crop Stress Biology for Arid Areas, Northwest A&F UniversityYangling, China
| | - Qiang Zhang
- College of Plant Protection, Northwest A&F UniversityYangling, China
- State Key Laboratory of Crop Stress Biology for Arid Areas, Northwest A&F UniversityYangling, China
| | - Meixiang Zhang
- College of Life Sciences, Northwest A&F UniversityYangling, China
| | - Biao Gu
- College of Plant Protection, Northwest A&F UniversityYangling, China
- State Key Laboratory of Crop Stress Biology for Arid Areas, Northwest A&F UniversityYangling, China
| | - Guiyan Huang
- State Key Laboratory of Crop Stress Biology for Arid Areas, Northwest A&F UniversityYangling, China
- College of Life Sciences, Northwest A&F UniversityYangling, China
| | - Qinhu Wang
- State Key Laboratory of Crop Stress Biology for Arid Areas, Northwest A&F UniversityYangling, China
- College of Life Sciences, Northwest A&F UniversityYangling, China
| | - Weixing Shan
- College of Plant Protection, Northwest A&F UniversityYangling, China
- State Key Laboratory of Crop Stress Biology for Arid Areas, Northwest A&F UniversityYangling, China
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44
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Meng Y, Huang Y, Wang Q, Wen Q, Jia J, Zhang Q, Huang G, Quan J, Shan W. Phenotypic and genetic characterization of resistance in Arabidopsis thaliana to the oomycete pathogen Phytophthora parasitica. FRONTIERS IN PLANT SCIENCE 2015; 6:378. [PMID: 26074940 PMCID: PMC4445315 DOI: 10.3389/fpls.2015.00378] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2015] [Accepted: 05/12/2015] [Indexed: 05/28/2023]
Abstract
The interaction between Arabidopsis thaliana and the oomycete pathogen Phytophthora parasitica emerges as a model for exploring the molecular basis and evolution of recognition and host defense. Phenotypic variation and genetic analysis is essential to dissect the underlying mechanisms in plant-oomycete interaction. In this study, the reaction phenotypes of 28 A. thaliana accessions to P. parasitica strain Pp016 were examined using detached leaf infection assay. The results showed the presence of four distinct groups based on host response and disease development. Of all the accessions examined, Zurich (Zu-1) is highly resistant to P. parasitica. Microscopic characterization showed that rapid and severe hypersensitive response at the primary infection epidermal cells is associated with disease resistance. Furthermore, Zu-1 is resistant to a set of 20 diverse P. parasitica strains, which were collected from different host plants and exhibited differential specificities on a set of tobacco cultivars. However, Zu-1 is susceptible to P. parasitica when the root is inoculated, suggesting differential expression of associated resistance genes in the root and foliar tissues. Genetic analysis by crossing Zu-1 and the susceptible accession Landsberg (Ler) showed that the resistance in Zu-1 to P. parasitica is semi-dominant, as shown by infection assays of F1 progenies, and is likely conferred by a single locus, defined as RPPA1 (Zu-1) (for Resistance to P. parasitica 1), as shown by analysis of F2 segregating populations. By employing specific-locus amplified fragment sequencing (SLAF-seq) strategy to identify molecular markers potentially linked to the locus, the strongest associated region was determined to be located between 7.1 and 11.2 Mb in chromosome IV. The future cloning of RPPA1 (Zu-1) locus will facilitate improved understanding of plant broad-spectrum disease resistance to oomycete pathogens.
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Affiliation(s)
- Yuling Meng
- College of Plant Protection, Northwest A&F UniversityYangling, China
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Plant Protection, Northwest A&F UniversityYangling, China
| | - Yihua Huang
- College of Plant Protection, Northwest A&F UniversityYangling, China
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Plant Protection, Northwest A&F UniversityYangling, China
| | - Qinhu Wang
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Plant Protection, Northwest A&F UniversityYangling, China
- College of Life Sciences, Northwest A&F UniversityYangling, China
| | - Qujiang Wen
- College of Plant Protection, Northwest A&F UniversityYangling, China
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Plant Protection, Northwest A&F UniversityYangling, China
| | - Jinbu Jia
- College of Plant Protection, Northwest A&F UniversityYangling, China
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Plant Protection, Northwest A&F UniversityYangling, China
| | - Qiang Zhang
- College of Plant Protection, Northwest A&F UniversityYangling, China
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Plant Protection, Northwest A&F UniversityYangling, China
| | - Guiyan Huang
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Plant Protection, Northwest A&F UniversityYangling, China
- College of Life Sciences, Northwest A&F UniversityYangling, China
| | - Junli Quan
- College of Plant Protection, Northwest A&F UniversityYangling, China
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Plant Protection, Northwest A&F UniversityYangling, China
| | - Weixing Shan
- College of Plant Protection, Northwest A&F UniversityYangling, China
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Plant Protection, Northwest A&F UniversityYangling, China
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Ludwig-Müller J, Jülke S, Geiß K, Richter F, Mithöfer A, Šola I, Rusak G, Keenan S, Bulman S. A novel methyltransferase from the intracellular pathogen Plasmodiophora brassicae methylates salicylic acid. MOLECULAR PLANT PATHOLOGY 2015; 16:349-64. [PMID: 25135243 PMCID: PMC6638400 DOI: 10.1111/mpp.12185] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
The obligate biotrophic pathogen Plasmodiophora brassicae causes clubroot disease in Arabidopsis thaliana, which is characterized by large root galls. Salicylic acid (SA) production is a defence response in plants, and its methyl ester is involved in systemic signalling. Plasmodiophora brassicae seems to suppress plant defence reactions, but information on how this is achieved is scarce. Here, we profile the changes in SA metabolism during Arabidopsis clubroot disease. The accumulation of SA and the emission of methylated SA (methyl salicylate, MeSA) were observed in P. brassicae-infected Arabidopsis 28 days after inoculation. There is evidence that MeSA is transported from infected roots to the upper plant. Analysis of the mutant Atbsmt1, deficient in the methylation of SA, indicated that the Arabidopsis SA methyltransferase was not responsible for alterations in clubroot symptoms. We found that P. brassicae possesses a methyltransferase (PbBSMT) with homology to plant methyltransferases. The PbBSMT gene is maximally transcribed when SA production is highest. By heterologous expression and enzymatic analyses, we showed that PbBSMT can methylate SA, benzoic and anthranilic acids.
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Affiliation(s)
- Jutta Ludwig-Müller
- Institute of Botany, Technische Universität Dresden, 01062, Dresden, Germany
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Blaya J, Lloret E, Ros M, Pascual JA. Identification of predictor parameters to determine agro-industrial compost suppressiveness against Fusarium oxysporum and Phytophthora capsici diseases in muskmelon and pepper seedlings. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2015; 95:1482-1490. [PMID: 25074864 DOI: 10.1002/jsfa.6847] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2014] [Revised: 05/19/2014] [Accepted: 07/24/2014] [Indexed: 06/03/2023]
Abstract
BACKGROUND The lack of reliable prediction tools for evaluation of the level and specificity of compost suppressiveness limits its application. In our study, different chemical, biological and microbiological parameters were used to evaluate their potential use as a predictor parameter for the suppressive effect of composts against Fusarium oxysporum f. sp. melonis (FOM) and Phytophthora capsici (P. capsici) in muskmelon and pepper seedlings respectively. Composts were obtained from artichoke sludge, chopped vineyard pruning waste and various agro-industrial wastes (C1: blanched artichokes; C2: garlic waste; C3: dry olive cake). RESULTS Compost C3 proved to offer the highest level of resistance against FOM, and compost C2 the highest level of resistance against P. capsici. Analysis of phospholipid fatty acids isolated from compost revealed that the three composts showed different microbial community structures. Protease, NAGase and chitinase activities were significantly higher in compost C3, as was dehydrogenase activity in compost C2. CONCLUSION The use of specific parameters such as general (dehydrogenase activity) and specific enzymatic activities (protease, NAGase and chitinase activities) may be useful to predict compost suppressiveness against both pathogens. The selection of raw materials for agro-industrial composts is important in controlling Fusarium wilt and Phytophthora root rot.
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Affiliation(s)
- Josefa Blaya
- Department of Soil and Water Conservation and Organic Wastes Management, Centro de Edafología y Biología Aplicada del Segura (CEBAS-CSIC), 30100, Espinardo, Murcia, Spain
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Kamoun S, Furzer O, Jones JDG, Judelson HS, Ali GS, Dalio RJD, Roy SG, Schena L, Zambounis A, Panabières F, Cahill D, Ruocco M, Figueiredo A, Chen XR, Hulvey J, Stam R, Lamour K, Gijzen M, Tyler BM, Grünwald NJ, Mukhtar MS, Tomé DFA, Tör M, Van Den Ackerveken G, McDowell J, Daayf F, Fry WE, Lindqvist-Kreuze H, Meijer HJG, Petre B, Ristaino J, Yoshida K, Birch PRJ, Govers F. The Top 10 oomycete pathogens in molecular plant pathology. MOLECULAR PLANT PATHOLOGY 2015; 16:413-34. [PMID: 25178392 PMCID: PMC6638381 DOI: 10.1111/mpp.12190] [Citation(s) in RCA: 474] [Impact Index Per Article: 52.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Oomycetes form a deep lineage of eukaryotic organisms that includes a large number of plant pathogens which threaten natural and managed ecosystems. We undertook a survey to query the community for their ranking of plant-pathogenic oomycete species based on scientific and economic importance. In total, we received 263 votes from 62 scientists in 15 countries for a total of 33 species. The Top 10 species and their ranking are: (1) Phytophthora infestans; (2, tied) Hyaloperonospora arabidopsidis; (2, tied) Phytophthora ramorum; (4) Phytophthora sojae; (5) Phytophthora capsici; (6) Plasmopara viticola; (7) Phytophthora cinnamomi; (8, tied) Phytophthora parasitica; (8, tied) Pythium ultimum; and (10) Albugo candida. This article provides an introduction to these 10 taxa and a snapshot of current research. We hope that the list will serve as a benchmark for future trends in oomycete research.
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Affiliation(s)
- Sophien Kamoun
- The Sainsbury Laboratory, Norwich Research Park, Norwich, NR4 7UH, UK
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48
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Wyrsch I, Domínguez-Ferreras A, Geldner N, Boller T. Tissue-specific FLAGELLIN-SENSING 2 (FLS2) expression in roots restores immune responses in Arabidopsis fls2 mutants. THE NEW PHYTOLOGIST 2015; 206:774-84. [PMID: 25627577 DOI: 10.1111/nph.13280] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2014] [Accepted: 12/06/2014] [Indexed: 05/05/2023]
Abstract
The flagellin receptor of Arabidopsis, At-FLAGELLIN SENSING 2 (FLS2), has become a model for mechanistic and functional studies on plant immune receptors. Responses to flagellin or its active epitope flagellin 22 (flg22) have been extensively studied in Arabidopsis leaves. However, the perception of microbe-associated molecular patterns (MAMPs) and the immune responses in roots are poorly understood. Here, we show that isolated root tissue is able to induce pattern-triggered immunity (PTI) responses upon flg22 perception, in contrast to elf18 (the active epitope of elongation factor thermo unstable (EF-Tu)). Making use of fls2 mutant plants and tissue-specific promoters, we generated transgenic Arabidopsis lines expressing FLS2 only in certain root tissues. This allowed us to study the spatial requirements for flg22 responses in the root. Remarkably, the intensity of the immune responses did not always correlate with the expression level of the FLS2 receptor, but depended on the expressing tissue, supporting the idea that MAMP perception and sensitivity in different tissues contribute to a proper balance of defense responses according to the expected exposure to elicitors. In summary, we conclude that each investigated root tissue is able to perceive flg22 if FLS2 is present and that tissue identity is a major element of MAMP perception in roots.
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Affiliation(s)
- Ines Wyrsch
- Department of Environmental Sciences, Botany, Zürich-Basel Plant Science Center, University of Basel, Hebelstrasse 1, Basel, CH-4056, Switzerland
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49
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De Coninck B, Timmermans P, Vos C, Cammue BPA, Kazan K. What lies beneath: belowground defense strategies in plants. TRENDS IN PLANT SCIENCE 2015; 20:91-101. [PMID: 25307784 DOI: 10.1016/j.tplants.2014.09.007] [Citation(s) in RCA: 112] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/28/2014] [Revised: 09/12/2014] [Accepted: 09/16/2014] [Indexed: 05/17/2023]
Abstract
Diseases caused by soil-borne pathogens result worldwide in significant yield losses in economically important crops. In contrast to foliar diseases, relatively little is known about the nature of root defenses against these pathogens. This review summarizes the current knowledge on root infection strategies, root-specific preformed barriers, pathogen recognition, and defense signaling. Studies reviewed here suggest that many commonalities as well as differences exist in defense strategies employed by roots and foliar tissues during pathogen attack. Importantly, in addition to pathogens, plant roots interact with a plethora of non-pathogenic and symbiotic microorganisms. Therefore, a good understanding of how plant roots interact with the microbiome would be particularly important to engineer resistance to root pathogens without negatively altering root-beneficial microbe interactions.
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Affiliation(s)
- Barbara De Coninck
- Centre of Microbial and Plant Genetics, Katholieke Universiteit (KU) Leuven, Kasteelpark Arenberg 20, 3001 Heverlee, Belgium; Department of Plant Systems Biology, Vlaams Instituut voor Biotechnologie (VIB), Technologiepark 927, 9052 Gent, Belgium
| | - Pieter Timmermans
- Centre of Microbial and Plant Genetics, Katholieke Universiteit (KU) Leuven, Kasteelpark Arenberg 20, 3001 Heverlee, Belgium
| | - Christine Vos
- Centre of Microbial and Plant Genetics, Katholieke Universiteit (KU) Leuven, Kasteelpark Arenberg 20, 3001 Heverlee, Belgium; Department of Plant Systems Biology, Vlaams Instituut voor Biotechnologie (VIB), Technologiepark 927, 9052 Gent, Belgium
| | - Bruno P A Cammue
- Centre of Microbial and Plant Genetics, Katholieke Universiteit (KU) Leuven, Kasteelpark Arenberg 20, 3001 Heverlee, Belgium; Department of Plant Systems Biology, Vlaams Instituut voor Biotechnologie (VIB), Technologiepark 927, 9052 Gent, Belgium.
| | - Kemal Kazan
- Commonwealth Scientific and Industrial Research Organisation (CSIRO) Agriculture Flagship, Queensland Bioscience Precinct, Brisbane, Queensland, 4067, Australia; Queensland Alliance for Agriculture & Food Innovation (QAAFI), The University of Queensland, St Lucia, Brisbane, Queensland 4067, Australia
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50
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Interspecific Competition in Arabidopsis thaliana: A Knowledge Gap Is Starting to Close. PROGRESS IN BOTANY 2015. [DOI: 10.1007/978-3-319-08807-5_12] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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