101
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Aleman F, Yazaki J, Lee M, Takahashi Y, Kim AY, Li Z, Kinoshita T, Ecker JR, Schroeder JI. An ABA-increased interaction of the PYL6 ABA receptor with MYC2 Transcription Factor: A putative link of ABA and JA signaling. Sci Rep 2016; 6:28941. [PMID: 27357749 PMCID: PMC4928087 DOI: 10.1038/srep28941] [Citation(s) in RCA: 123] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2016] [Accepted: 06/06/2016] [Indexed: 01/30/2023] Open
Abstract
Abscisic acid (ABA) is a plant hormone that mediates abiotic stress tolerance and regulates growth and development. ABA binds to members of the PYL/RCAR ABA receptor family that initiate signal transduction inhibiting type 2C protein phosphatases. Although crosstalk between ABA and the hormone Jasmonic Acid (JA) has been shown, the molecular entities that mediate this interaction have yet to be fully elucidated. We report a link between ABA and JA signaling through a direct interaction of the ABA receptor PYL6 (RCAR9) with the basic helix-loop-helix transcription factor MYC2. PYL6 and MYC2 interact in yeast two hybrid assays and the interaction is enhanced in the presence of ABA. PYL6 and MYC2 interact in planta based on bimolecular fluorescence complementation and co-immunoprecipitation of the proteins. Furthermore, PYL6 was able to modify transcription driven by MYC2 using JAZ6 and JAZ8 DNA promoter elements in yeast one hybrid assays. Finally, pyl6 T-DNA mutant plants show an increased sensitivity to the addition of JA along with ABA in cotyledon expansion experiments. Overall, the present study identifies a direct mechanism for transcriptional modulation mediated by an ABA receptor different from the core ABA signaling pathway, and a putative mechanistic link connecting ABA and JA signaling pathways.
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Affiliation(s)
- Fernando Aleman
- Division of Biological Sciences, Cell and Developmental Biology Section, University of California San Diego, La Jolla, California, USA
| | - Junshi Yazaki
- Plant Biology Laboratory, Genomic Analysis Laboratory, The Salk Institute for Biological Studies, La Jolla, California, 92037 USA
| | - Melissa Lee
- Division of Biological Sciences, Cell and Developmental Biology Section, University of California San Diego, La Jolla, California, USA
| | - Yohei Takahashi
- Division of Biological Sciences, Cell and Developmental Biology Section, University of California San Diego, La Jolla, California, USA
- Division of Biological Science, Graduate School of Science, Nagoya University, Nagoya 464-8602, Japan
| | - Alice Y. Kim
- Plant Biology Laboratory, Genomic Analysis Laboratory, The Salk Institute for Biological Studies, La Jolla, California, 92037 USA
| | - Zixing Li
- Division of Biological Sciences, Cell and Developmental Biology Section, University of California San Diego, La Jolla, California, USA
| | - Toshinori Kinoshita
- Division of Biological Science, Graduate School of Science, Nagoya University, Nagoya 464-8602, Japan
- Institute of Transformative Bio-Molecules (WPI-ITbM), Nagoya University, Nagoya 464-8602, Japan
| | - Joseph R. Ecker
- Plant Biology Laboratory, Genomic Analysis Laboratory, The Salk Institute for Biological Studies, La Jolla, California, 92037 USA
- Howard Hughes Medical Institute, The Salk Institute for Biological Studies, La Jolla, California, 92037 USA
| | - Julian I. Schroeder
- Division of Biological Sciences, Cell and Developmental Biology Section, University of California San Diego, La Jolla, California, USA
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102
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Aleman F, Yazaki J, Lee M, Takahashi Y, Kim AY, Li Z, Kinoshita T, Ecker JR, Schroeder JI. An ABA-increased interaction of the PYL6 ABA receptor with MYC2 Transcription Factor: A putative link of ABA and JA signaling. Sci Rep 2016; 6:28941. [PMID: 27357749 DOI: 10.1038/srep2894] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2016] [Accepted: 06/06/2016] [Indexed: 05/26/2023] Open
Abstract
Abscisic acid (ABA) is a plant hormone that mediates abiotic stress tolerance and regulates growth and development. ABA binds to members of the PYL/RCAR ABA receptor family that initiate signal transduction inhibiting type 2C protein phosphatases. Although crosstalk between ABA and the hormone Jasmonic Acid (JA) has been shown, the molecular entities that mediate this interaction have yet to be fully elucidated. We report a link between ABA and JA signaling through a direct interaction of the ABA receptor PYL6 (RCAR9) with the basic helix-loop-helix transcription factor MYC2. PYL6 and MYC2 interact in yeast two hybrid assays and the interaction is enhanced in the presence of ABA. PYL6 and MYC2 interact in planta based on bimolecular fluorescence complementation and co-immunoprecipitation of the proteins. Furthermore, PYL6 was able to modify transcription driven by MYC2 using JAZ6 and JAZ8 DNA promoter elements in yeast one hybrid assays. Finally, pyl6 T-DNA mutant plants show an increased sensitivity to the addition of JA along with ABA in cotyledon expansion experiments. Overall, the present study identifies a direct mechanism for transcriptional modulation mediated by an ABA receptor different from the core ABA signaling pathway, and a putative mechanistic link connecting ABA and JA signaling pathways.
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Affiliation(s)
- Fernando Aleman
- Division of Biological Sciences, Cell and Developmental Biology Section, University of California San Diego, La Jolla, California, USA
| | - Junshi Yazaki
- Plant Biology Laboratory, Genomic Analysis Laboratory, The Salk Institute for Biological Studies, La Jolla, California, 92037 USA
| | - Melissa Lee
- Division of Biological Sciences, Cell and Developmental Biology Section, University of California San Diego, La Jolla, California, USA
| | - Yohei Takahashi
- Division of Biological Sciences, Cell and Developmental Biology Section, University of California San Diego, La Jolla, California, USA
- Division of Biological Science, Graduate School of Science, Nagoya University, Nagoya 464-8602, Japan
| | - Alice Y Kim
- Plant Biology Laboratory, Genomic Analysis Laboratory, The Salk Institute for Biological Studies, La Jolla, California, 92037 USA
| | - Zixing Li
- Division of Biological Sciences, Cell and Developmental Biology Section, University of California San Diego, La Jolla, California, USA
| | - Toshinori Kinoshita
- Division of Biological Science, Graduate School of Science, Nagoya University, Nagoya 464-8602, Japan
- Institute of Transformative Bio-Molecules (WPI-ITbM), Nagoya University, Nagoya 464-8602, Japan
| | - Joseph R Ecker
- Plant Biology Laboratory, Genomic Analysis Laboratory, The Salk Institute for Biological Studies, La Jolla, California, 92037 USA
- Howard Hughes Medical Institute, The Salk Institute for Biological Studies, La Jolla, California, 92037 USA
| | - Julian I Schroeder
- Division of Biological Sciences, Cell and Developmental Biology Section, University of California San Diego, La Jolla, California, USA
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103
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Liu Y, Guo Y, Ma C, Zhang D, Wang C, Yang Q, Xu M. Transcriptome analysis of maize resistance to Fusarium graminearum. BMC Genomics 2016; 17:477. [PMID: 27352627 PMCID: PMC4924250 DOI: 10.1186/s12864-016-2780-5] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2016] [Accepted: 05/26/2016] [Indexed: 12/25/2022] Open
Abstract
BACKGROUND Gibberella stalk rot caused by Fusarium graminearum is one of the most destructive soil-borne diseases of maize (Zea mays L.). Chemical means of controlling Gibberella stalk rot are not very effective; development of highly resistant hybrids is the best choice for disease control. Hence, understanding of the molecular basis underlying maize resistance against Gibberella stalk rot would undoubtedly facilitate the resistance breeding for stalk rot. RESULTS Two quantitative trait loci (QTL), qRfg1 and qRfg2, conferring resistance to Gibberella stalk rot were detected in our previous study. Three near-isogenic lines (NILs) of maize with either qRfg1 (NIL1) or qRfg2 (NIL2), or neither (NIL3) were generated and subjected to RNA sequencing to study the transcriptional changes after F. graminearum inoculation at 0 (control), 6, and 18 h post-inoculation (hpi). In total, 536,184,652 clean reads were generated, and gene expression levels were calculated using FPKM (fragments per kilobase of exon model per million mapped reads). A total of 7252 differentially expressed genes (DEGs) were found in the three NILs after F. graminearum inoculation. As many as 2499 DEGs were detected between NIL1 and NIL3 at 0 hpi, of which 884 DEGs were more abundant in NIL1 and enriched in defense responses. After F. graminearum inoculation, 1070 and 751 genes were exclusively up- and downregulated, respectively, in NIL1 as compared to NIL3. The 1070 upregulated DEGs were enriched in growth/development, photosynthesis/biogenesis, and defense-related responses. Genes encoding putative auxin-induced proteins and GH3 family proteins in auxin signaling pathway were highly induced and lasted longer in NIL3. Genes involved in polar auxin transport (PAT) were more abundant in NIL3 as compared with NIL2. CONCLUSIONS The qRfg1 confers its resistance to Gibberella stalk rot through both constitutive and induced high expression of defense-related genes; while qRfg2 enhances maize resistance to the disease via relatively lower induction of auxin signaling and repression of PAT. The defense-related transcriptional changes underlying each QTL will undoubtedly facilitate our understanding of the resistance mechanism and resistance breeding for maize stalk rot.
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Affiliation(s)
- Yongjie Liu
- National Maize Improvement Center of China, China Agriculture University, 2 West Yuanmingyuan Rd., Haidian District, Beijing, 100193 China
| | - Yanling Guo
- National Maize Improvement Center of China, China Agriculture University, 2 West Yuanmingyuan Rd., Haidian District, Beijing, 100193 China
| | - Chuanyu Ma
- National Maize Improvement Center of China, China Agriculture University, 2 West Yuanmingyuan Rd., Haidian District, Beijing, 100193 China
| | - Dongfeng Zhang
- National Maize Improvement Center of China, China Agriculture University, 2 West Yuanmingyuan Rd., Haidian District, Beijing, 100193 China
| | - Chao Wang
- National Maize Improvement Center of China, China Agriculture University, 2 West Yuanmingyuan Rd., Haidian District, Beijing, 100193 China
| | - Qin Yang
- National Maize Improvement Center of China, China Agriculture University, 2 West Yuanmingyuan Rd., Haidian District, Beijing, 100193 China
| | - Mingliang Xu
- National Maize Improvement Center of China, China Agriculture University, 2 West Yuanmingyuan Rd., Haidian District, Beijing, 100193 China
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104
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Ahmad P, Rasool S, Gul A, Sheikh SA, Akram NA, Ashraf M, Kazi AM, Gucel S. Jasmonates: Multifunctional Roles in Stress Tolerance. FRONTIERS IN PLANT SCIENCE 2016; 7:813. [PMID: 27379115 PMCID: PMC4908892 DOI: 10.3389/fpls.2016.00813] [Citation(s) in RCA: 177] [Impact Index Per Article: 22.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2016] [Accepted: 05/25/2016] [Indexed: 05/18/2023]
Abstract
Jasmonates (JAs) [Jasmonic acid (JA) and methyl jasmonates (MeJAs)] are known to take part in various physiological processes. Exogenous application of JAs so far tested on different plants under abiotic stresses particularly salinity, drought, and temperature (low/high) conditions have proved effective in improving plant stress tolerance. However, its extent of effectiveness entirely depends on the type of plant species tested or its concentration. The effects of introgression or silencing of different JA- and Me-JA-related genes have been summarized in this review, which have shown a substantial role in improving crop yield and quality in different plants under stress or non-stress conditions. Regulation of JAs synthesis is impaired in stressed as well as unstressed plant cells/tissues, which is believed to be associated with a variety of metabolic events including signal transduction. Although, mitogen activated protein kinases (MAPKs) are important components of JA signaling and biosynthesis pathways, nitric oxide, ROS, calcium, ABA, ethylene, and salicylic acid are also important mediators of plant growth and development during JA signal transduction and synthesis. The exploration of other signaling molecules can be beneficial to examine the details of underlying molecular mechanisms of JA signal transduction. Much work is to be done in near future to find the proper answers of the questions like action of JA related metabolites, and identification of universal JA receptors etc. Complete signaling pathways involving MAPKs, CDPK, TGA, SIPK, WIPK, and WRKY transcription factors are yet to be investigated to understand the complete mechanism of action of JAs.
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Affiliation(s)
- Parvaiz Ahmad
- Department of Botany, S.P. CollegeSrinagar, India
- Department of Botany and Microbiology, College of Sciences, King Saud UniversityRiyadh, Saudi Arabia
| | - Saiema Rasool
- Forest Biotech Lab, Department of Forest Management, Faculty of Forestry, Universiti Putra MalaysiaSelangor, Malaysia
| | - Alvina Gul
- Atta-ur-Rahman School of Applied Biosciences, National University of Science and TechnologyIslamabad, Pakistan
| | - Subzar A. Sheikh
- Department of Botany, Govt. Degree College (Boys), AnantnagAnantnag, India
| | - Nudrat A. Akram
- Department of Botany, GC University FaisalabadFaisalabad, Pakistan
| | - Muhammad Ashraf
- Department of Botany and Microbiology, College of Sciences, King Saud UniversityRiyadh, Saudi Arabia
- Pakistan Science FoundationIslamabad, Pakistan
| | - A. M. Kazi
- Department of Botany, University of SargodhaSargodha, Pakistan
| | - Salih Gucel
- Centre for Environmental Research, Near East UniversityNicosia, Cyprus
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105
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Wang C, Zhang X, Mou Z. Comparison of nicotinamide adenine dinucleotide phosphate-induced immune responses against biotrophic and necrotrophic pathogens in Arabidopsis thaliana. PLANT SIGNALING & BEHAVIOR 2016; 11:e1169358. [PMID: 27031653 PMCID: PMC4973797 DOI: 10.1080/15592324.2016.1169358] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2016] [Revised: 03/14/2016] [Accepted: 03/16/2016] [Indexed: 05/20/2023]
Abstract
The pyridine nucleotide nicotinamide adenine dinucleotide phosphate (NADP) is a universal coenzyme in anabolic reactions and also functions in intracellular signaling by serving as a substrate for production of the Ca(2+)-mobilizing agent nicotinic acid adenine dinucleotide phosphate (NAADP). It has recently been shown that, in mammalian cells, cellular NADP can be released into the extracellular compartment (ECC) upon environmental stresses by active exocytosis or diffusion through transmembrane transporters in living cells or passive leakage across the membrane in dying cells. In the ECC, NADP can either serve as a substrate for production of NAADP or act directly on purinoceptors to activate transmembrane signaling. In the last several years, extracellular NADP has also been suggested to function in plant immune responses. Here, we compared exogenous NADP-induced immune responses against biotrophic and necrotrophic pathogens in the Arabidopsis thaliana ecotype Columbia and found that NADP addition induces salicylic acid-mediated defense signaling but not jasmonic acid/ethylene-mediated defense responses. These results suggest the specificity of exogenous NADP-activated signaling in plants.
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Affiliation(s)
- Chenggang Wang
- Department of Microbiology and Cell Science, University of Florida, Gainesville, FL, USA
| | - Xudong Zhang
- Department of Microbiology and Cell Science, University of Florida, Gainesville, FL, USA
| | - Zhonglin Mou
- Department of Microbiology and Cell Science, University of Florida, Gainesville, FL, USA
- CONTACT Zhonglin Mou
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106
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Yu Q, Liu J, Zheng H, Jia Y, Tian H, Ding Z. Topoisomerase II-associated protein PAT1H1 is involved in the root stem cell niche maintenance in Arabidopsis thaliana. PLANT CELL REPORTS 2016; 35:1297-307. [PMID: 26956135 DOI: 10.1007/s00299-016-1961-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2015] [Accepted: 02/21/2016] [Indexed: 05/15/2023]
Abstract
PAT1H1, one of the homologues of Topoisomerase II-associated protein, is involved in the maintenance of root stem cell niche through the interaction with NINJA. The root stem cell niche, which possesses four mitotically inactive quiescent cells (QC) and the surrounding mitotically active stem cells, is critical for root development in Arabidopsis thaliana. However, the molecular regulation of the maintenance of root stem cell niche identity is still not fully understood. Here we show that one of the homologues of Topoisomerase II-associated protein, here named as PAT1H1, could regulate root stem cell niche identity. The pat1h1 mutant showed higher frequency of QC cell division and root distal stem cell (DSC) differentiation. With a high expression in roots, PAT1H1 was found to interact with the jasmonic acid (JA) signalling negative regulator Novel Interactor of JAZ (NINJA) and thus regulate root DSC niche identity. Consistent with the active QC cell division, which rarely occurs in wild-type controls, the pat1h1 mutant displayed higher expression of CYCB1 in the root stem cell niche. Together our data reveals that PAT1H1 maintains root stem cell niche stability through the interaction with NINJA and the regulation of cell division.
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Affiliation(s)
- Qianqian Yu
- The Key Laboratory of Plant Cell Engineering and Germplasm Innovation, Ministry of Education, School of Life Sciences, Shandong University, Jinan, 250100, People's Republic of China
| | - Jiajia Liu
- The Key Laboratory of Plant Cell Engineering and Germplasm Innovation, Ministry of Education, School of Life Sciences, Shandong University, Jinan, 250100, People's Republic of China
| | - Huihui Zheng
- The Key Laboratory of Plant Cell Engineering and Germplasm Innovation, Ministry of Education, School of Life Sciences, Shandong University, Jinan, 250100, People's Republic of China
| | - Yuebin Jia
- The Key Laboratory of Plant Cell Engineering and Germplasm Innovation, Ministry of Education, School of Life Sciences, Shandong University, Jinan, 250100, People's Republic of China
| | - Huiyu Tian
- The Key Laboratory of Plant Cell Engineering and Germplasm Innovation, Ministry of Education, School of Life Sciences, Shandong University, Jinan, 250100, People's Republic of China.
| | - Zhaojun Ding
- The Key Laboratory of Plant Cell Engineering and Germplasm Innovation, Ministry of Education, School of Life Sciences, Shandong University, Jinan, 250100, People's Republic of China
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107
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Sattar S, Addo-Quaye C, Thompson GA. miRNA-mediated auxin signalling repression during Vat-mediated aphid resistance in Cucumis melo. PLANT, CELL & ENVIRONMENT 2016; 39:1216-27. [PMID: 26437210 DOI: 10.1111/pce.12645] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2015] [Revised: 09/12/2015] [Accepted: 09/16/2015] [Indexed: 05/06/2023]
Abstract
Resistance to Aphis gossypii in melon is attributed to the presence of the single dominant R gene virus aphid transmission (Vat), which is biologically expressed as antibiosis, antixenosis and tolerance. However, the mechanism of resistance is poorly understood at the molecular level. Aphid-induced transcriptional changes, including differentially expressed miRNA profiles that correspond to resistance interaction have been reported in melon. The potential regulatory roles of miRNAs in Vat-mediated aphid resistance were further revealed by identifying the specific miRNA degradation targets. A total of 70 miRNA:target pairs, including 28 novel miRNA:target pairs, for the differentially expressed miRNAs were identified: 11 were associated with phytohormone regulation, including six miRNAs that potentially regulate auxin interactions. A model for a redundant regulatory system of miRNA-mediated auxin insensitivity is proposed that incorporates auxin perception, auxin modification and auxin-regulated transcription. Chemically inhibiting the transport inhibitor response-1 (TIR-1) auxin receptor in susceptible melon tissues provides in vivo support for the model of auxin-mediated impacts on A. gossypii resistance.
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Affiliation(s)
- Sampurna Sattar
- College of Agricultural Sciences, The Pennsylvania State University, University Park, PA, 16802, USA
| | - Charles Addo-Quaye
- Department of Horticulture and Landscape Architecture, Purdue University, West Lafayette, IN, 47907, USA
| | - Gary A Thompson
- College of Agricultural Sciences, The Pennsylvania State University, University Park, PA, 16802, USA
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108
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Methyl Jasmonate: An Alternative for Improving the Quality and Health Properties of Fresh Fruits. Molecules 2016; 21:molecules21060567. [PMID: 27258240 PMCID: PMC6273056 DOI: 10.3390/molecules21060567] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2016] [Revised: 04/19/2016] [Accepted: 04/21/2016] [Indexed: 12/11/2022] Open
Abstract
Methyl jasmonate (MeJA) is a plant growth regulator belonging to the jasmonate family. It plays an important role as a possible airborne signaling molecule mediating intra- and inter-plant communications and modulating plant defense responses, including antioxidant systems. Most assessments of this compound have dealt with post-harvest fruit applications, demonstrating induced plant resistance against the detrimental impacts of storage (chilling injuries and pathogen attacks), enhancing secondary metabolites and antioxidant activity. On the other hand, the interactions between MeJA and other compounds or technological tools for enhancing antioxidant capacity and quality of fruits were also reviewed. The pleiotropic effects of MeJA have raisen numerous as-yet unanswered questions about its mode of action. The aim of this review was endeavored to clarify the role of MeJA on improving pre- and post-harvest fresh fruit quality and health properties. Interestingly, the influence of MeJA on human health will be also discussed.
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109
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Li Y, Tian S, Yang X, Wang X, Guo Y, Ni H. Transcriptomic analysis reveals distinct resistant response by physcion and chrysophanol against cucumber powdery mildew. PeerJ 2016; 4:e1991. [PMID: 27231648 PMCID: PMC4878370 DOI: 10.7717/peerj.1991] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2016] [Accepted: 04/08/2016] [Indexed: 11/20/2022] Open
Abstract
Physcion and chrysophanol induce defense responses against powdery mildew in cucumbers. The combination of these two compounds has synergistic interaction against the disease. We performed RNA-seq on cucumber leaf samples treated with physcion and chrysophanol alone and with their combination. We generated 17.6 Gb of high-quality sequencing data (∼2 Gb per sample) and catalogued the expressions profiles of 12,293 annotated cucumber genes in each sample. We identified numerous differentially expressed genes that exhibited distinct expression patterns among the three treatments. The gene expression patterns of the Chr and Phy treatments were more similar to each other than to the Phy × Chr treatment. The Phy × Chr treatment induced the highest number of differentially expressed genes. This dramatic transcriptional change after Phy × Chr treatment leaves reflects that physcion combined with chrysophanol treatment was most closely associated with induction of disease resistance. The analysis showed that the combination treatment caused expression changes of numerous defense-related genes. These genes have known or potential roles in structural, chemical and signaling defense responses and were enriched in functional gene categories potentially responsible for cucumber resistance. These results clearly demonstrated that disease resistance in cucumber leaves was significantly influenced by the combined physcion and chrysophanol treatment. Thus, physcion and chrysophanol are appealing candidates for further investigation of the gene expression and associated regulatory mechanisms related to the defense response.
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Affiliation(s)
- Yanping Li
- College of Agronomy and Biotechnology, China Agricultural University, Beijing, China
| | - Shilin Tian
- Novogene Bioinformatics Institute, Beijing, China
- Institute of Animal Genetics and Breeding, College of Animal Science and Technology, Sichuan Agricultural University, Ya’an Sichuan, China
| | - Xiaojun Yang
- College of Agronomy and Biotechnology, China Agricultural University, Beijing, China
| | - Xin Wang
- College of Agronomy and Biotechnology, China Agricultural University, Beijing, China
| | - Yuhai Guo
- College of Agronomy and Biotechnology, China Agricultural University, Beijing, China
| | - Hanwen Ni
- College of Agronomy and Biotechnology, China Agricultural University, Beijing, China
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110
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Taki-Nakano N, Kotera J, Ohta H. 12-oxo-phytodienoic acid, a plant-derived oxylipin, attenuates lipopolysaccharide-induced inflammation in microglia. Biochem Biophys Res Commun 2016; 473:1288-1294. [DOI: 10.1016/j.bbrc.2016.04.060] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2016] [Accepted: 04/12/2016] [Indexed: 12/23/2022]
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111
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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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112
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Ostria-Gallardo E, Ranjan A, Chitwood DH, Kumar R, Townsley BT, Ichihashi Y, Corcuera LJ, Sinha NR. Transcriptomic analysis suggests a key role for SQUAMOSA PROMOTER BINDING PROTEIN LIKE, NAC and YUCCA genes in the heteroblastic development of the temperate rainforest tree Gevuina avellana (Proteaceae). THE NEW PHYTOLOGIST 2016; 210:694-708. [PMID: 26680017 DOI: 10.1111/nph.13776] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2015] [Accepted: 10/19/2015] [Indexed: 05/11/2023]
Abstract
Heteroblasty, the temporal development of the meristem, can produce diverse leaf shapes within a plant. Gevuina avellana, a tree from the South American temperate rainforest shows strong heteroblasty affecting leaf shape, transitioning from juvenile simple leaves to highly pinnate adult leaves. Light availability within the forest canopy also modulates its leaf size and complexity. Here we studied how the interaction between the light environment and the heteroblastic progression of leaves is coordinated in this species. We used RNA-seq on the Illumina platform to compare the range of transcriptional responses in leaf primordia of G. avellana at different heteroblastic stages and growing under different light environments. We found a steady up-regulation of SQUAMOSA PROMOTER BINDING PROTEIN LIKE (SPL), NAC, YUCCA and AGAMOUS-LIKE genes associated with increases in age, leaf complexity, and light availability. In contrast, expression of TCP, TPR and KNOTTED1 homeobox genes showed a sustained down-regulation. Additionally, genes involved in auxin synthesis/transport and jasmonate activity were differentially expressed, indicating an active regulation of processes controlled by these hormones. Our large-scale transcriptional analysis of the leaf primordia of G. avellana sheds light on the integration of internal and external cues during heteroblastic development in this species.
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Affiliation(s)
- Enrique Ostria-Gallardo
- Departamento de Botánica, Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción, 4030000, Biobío, Chile
| | - Aashish Ranjan
- Department of Plant Biology, University of California, Davis, CA, 95616, USA
- National Institute of Plant Genome Research, New Delhi, 110067, India
| | | | | | - Brad T Townsley
- Department of Plant Biology, University of California, Davis, CA, 95616, USA
| | - Yasunori Ichihashi
- RIKEN Center for Sustainable Resource Science, Yokohama, Kanagawa, 230-0045, Japan
| | - Luis J Corcuera
- Departamento de Botánica, Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción, 4030000, Biobío, Chile
| | - Neelima R Sinha
- Department of Plant Biology, University of California, Davis, CA, 95616, USA
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113
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Sharma KD, Nayyar H. Regulatory Networks in Pollen Development under Cold Stress. FRONTIERS IN PLANT SCIENCE 2016; 7:402. [PMID: 27066044 PMCID: PMC4814731 DOI: 10.3389/fpls.2016.00402] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2015] [Accepted: 03/14/2016] [Indexed: 05/18/2023]
Abstract
Cold stress modifies anthers' metabolic pathways to induce pollen sterility. Cold-tolerant plants, unlike the susceptible ones, produce high proportion of viable pollen. Anthers in susceptible plants, when exposed to cold stress, increase abscisic acid (ABA) metabolism and reduce ABA catabolism. Increased ABA negatively regulates expression of tapetum cell wall bound invertase and monosaccharide transport genes resulting in distorted carbohydrate pool in anther. Cold-stress also reduces endogenous levels of the bioactive gibberellins (GAs), GA4 and GA7, in susceptible anthers by repression of the GA biosynthesis genes. Here, we discuss recent findings on mechanisms of cold susceptibility in anthers which determine pollen sterility. We also discuss differences in regulatory pathways between cold-stressed anthers of susceptible and tolerant plants that decide pollen sterility or viability.
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Affiliation(s)
- Kamal D. Sharma
- Department of Agricultural Biotechnology, Chaudhary Sarwan Kumar Himachal Pradesh Agricultural UniversityPalampur, India
| | - Harsh Nayyar
- Department of Botany, Panjab UniversityChandigarh, India
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114
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Li D, Baldwin IT, Gaquerel E. Beyond the Canon: Within-Plant and Population-Level Heterogeneity in Jasmonate Signaling Engaged by Plant-Insect Interactions. PLANTS 2016; 5:plants5010014. [PMID: 27135234 PMCID: PMC4844416 DOI: 10.3390/plants5010014] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/19/2016] [Revised: 03/08/2016] [Accepted: 03/09/2016] [Indexed: 11/16/2022]
Abstract
Plants have evolved sophisticated communication and defense systems with which they interact with insects. Jasmonates are synthesized from the oxylipin pathway and act as pivotal cellular orchestrators of many of the metabolic and physiological processes that mediate these interactions. Many of these jasmonate-dependent responses are tissue-specific and translate from modulations of the canonical jasmonate signaling pathway. Here we provide a short overview of within-plant heterogeneities in jasmonate signaling and dependent responses in the context of plant-insect interactions as illuminated by examples from recent work with the ecological model, Nicotiana attenuata. We then discuss means of manipulating jasmonate signaling by creating tissue-specific jasmonate sinks, and the micrografting of different transgenic plants. The metabolic phenotyping of these manipulations provides an integrative understanding of the functional significance of deviations from the canonical model of this hormonal pathway. Additionally, natural variation in jasmonate biosynthesis and signaling both among and within species can explain polymorphisms in resistance to insects in nature. In this respect, insect-guided explorations of population-level variations in jasmonate metabolism have revealed more complexity than previously realized and we discuss how different "omic" techniques can be used to exploit the natural variation that occurs in this important signaling pathway.
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Affiliation(s)
- Dapeng Li
- Department of Molecular Ecology, Max Planck Institute for Chemical Ecology, Jena 07745, Germany.
| | - Ian T Baldwin
- Department of Molecular Ecology, Max Planck Institute for Chemical Ecology, Jena 07745, Germany.
| | - Emmanuel Gaquerel
- Centre for Organismal Studies, University of Heidelberg, Im Neuenheimer Feld 360, Heidelberg 69120, Germany.
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115
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Lemos M, Xiao Y, Bjornson M, Wang JZ, Hicks D, Souza AD, Wang CQ, Yang P, Ma S, Dinesh-Kumar S, Dehesh K. The plastidial retrograde signal methyl erythritol cyclopyrophosphate is a regulator of salicylic acid and jasmonic acid crosstalk. JOURNAL OF EXPERIMENTAL BOTANY 2016; 67:1557-66. [PMID: 26733689 PMCID: PMC4762391 DOI: 10.1093/jxb/erv550] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
The exquisite harmony between hormones and their corresponding signaling pathways is central to prioritizing plant responses to simultaneous and/or successive environmental trepidations. The crosstalk between jasmonic acid (JA) and salicylic acid (SA) is an established effective mechanism that optimizes and tailors plant adaptive responses. However, the underlying regulatory modules of this crosstalk are largely unknown. Global transcriptomic analyses of mutant plants (ceh1) with elevated levels of the stress-induced plastidial retrograde signaling metabolite 2-C-methyl-D-erythritol cyclopyrophosphate (MEcPP) revealed robustly induced JA marker genes, expected to be suppressed by the presence of constitutively high SA levels in the mutant background. Analyses of a range of genotypes with varying SA and MEcPP levels established the selective role of MEcPP-mediated signal(s) in induction of JA-responsive genes in the presence of elevated SA. Metabolic profiling revealed the presence of high levels of the JA precursor 12-oxo-phytodienoic acid (OPDA), but near wild type levels of JA in the ceh1 mutant plants. Analyses of coronatine-insensitive 1 (coi1)/ceh1 double mutant plants confirmed that the MEcPP-mediated induction is JA receptor COI1 dependent, potentially through elevated OPDA. These findings identify MEcPP as a previously unrecognized central regulatory module that induces JA-responsive genes in the presence of high SA, thereby staging a multifaceted plant response within the environmental context.
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Affiliation(s)
- Mark Lemos
- Department of Plant Biology, University of California Davis, Davis, CA 95616, USA
| | - Yanmei Xiao
- Department of Plant Biology, University of California Davis, Davis, CA 95616, USA
| | - Marta Bjornson
- Department of Plant Biology, University of California Davis, Davis, CA 95616, USA Department of Plant Sciences, University of California Davis, Davis, CA 95616, USA
| | - Jin-Zheng Wang
- Department of Plant Biology, University of California Davis, Davis, CA 95616, USA
| | - Derrick Hicks
- Department of Plant Biology, University of California Davis, Davis, CA 95616, USA
| | - Amancio de Souza
- Department of Plant Biology, University of California Davis, Davis, CA 95616, USA
| | - Chang-Quan Wang
- Department of Plant Biology, University of California Davis, Davis, CA 95616, USA
| | - Panyu Yang
- Department of Plant Biology, University of California Davis, Davis, CA 95616, USA
| | - Shisong Ma
- Department of Plant Biology, University of California Davis, Davis, CA 95616, USA
| | - Savithramma Dinesh-Kumar
- Department of Plant Biology, University of California Davis, Davis, CA 95616, USA Genome Center, University of California, Davis, Davis, CA 95616, USA
| | - Katayoon Dehesh
- Department of Plant Biology, University of California Davis, Davis, CA 95616, USA
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116
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Xu YH, Liao YC, Zhang Z, Liu J, Sun PW, Gao ZH, Sui C, Wei JH. Jasmonic acid is a crucial signal transducer in heat shock induced sesquiterpene formation in Aquilaria sinensis. Sci Rep 2016; 6:21843. [PMID: 26902148 PMCID: PMC4763180 DOI: 10.1038/srep21843] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2015] [Accepted: 01/28/2016] [Indexed: 01/05/2023] Open
Abstract
Agarwood, a highly valuable resinous and fragrant heartwood of Aquilaria plants, is widely used in traditional medicines, incense and perfume. Only when Aquilaria trees are wounded by external stimuli do they form agarwood sesquiterpene defensive compounds. Therefore, understanding the signaling pathway of wound-induced agarwood formation is important. Jasmonic acid (JA) is a well-characterized molecule that mediates a plant's defense response and secondary metabolism. However, little is known about the function of endogenous JA in agarwood sesquiterpene biosynthesis. Here, we report that heat shock can up-regulate the expression of genes in JA signaling pathway, induce JA production and the accumulation of agarwood sesquiterpene in A. sinensis cell suspension cultures. A specific inhibitor of JA, nordihydroguaiaretic acid (NDGA), could block the JA signaling pathway and reduce the accumulation of sesquiterpene compounds. Additionally, compared to SA and H2O2, exogenously supplied methyl jasmonate has the strongest stimulation effect on the production of sesquiterpene compounds. These results clearly demonstrate the central induction role of JA in heat-shock-induced sesquiterpene production in A. sinensis.
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Affiliation(s)
- Yan-Hong Xu
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, No. 151, Malianwa North Road, Haidian District, Beijing 100193, China
| | - Yong-Cui Liao
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, No. 151, Malianwa North Road, Haidian District, Beijing 100193, China
| | - Zheng Zhang
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, No. 151, Malianwa North Road, Haidian District, Beijing 100193, China
- Hainan Branch Institute of Medicinal Plant, Hainan Provincial Key Laboratory of Resources Conservation and Development of Southern Medicine, Chinese Academy of Medical Sciences & Peking Union Medical College, Wanning 571533, China
| | - Juan Liu
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, No. 151, Malianwa North Road, Haidian District, Beijing 100193, China
| | - Pei-Wen Sun
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, No. 151, Malianwa North Road, Haidian District, Beijing 100193, China
| | - Zhi-Hui Gao
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, No. 151, Malianwa North Road, Haidian District, Beijing 100193, China
| | - Chun Sui
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, No. 151, Malianwa North Road, Haidian District, Beijing 100193, China
| | - Jian-He Wei
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, No. 151, Malianwa North Road, Haidian District, Beijing 100193, China
- Hainan Branch Institute of Medicinal Plant, Hainan Provincial Key Laboratory of Resources Conservation and Development of Southern Medicine, Chinese Academy of Medical Sciences & Peking Union Medical College, Wanning 571533, China
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117
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Nagels Durand A, Pauwels L, Goossens A. The Ubiquitin System and Jasmonate Signaling. PLANTS 2016; 5:plants5010006. [PMID: 27135226 PMCID: PMC4844421 DOI: 10.3390/plants5010006] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/10/2015] [Revised: 12/21/2015] [Accepted: 12/28/2015] [Indexed: 01/04/2023]
Abstract
The ubiquitin (Ub) system is involved in most, if not all, biological processes in eukaryotes. The major specificity determinants of this system are the E3 ligases, which bind and ubiquitinate specific sets of proteins and are thereby responsible for target recruitment to the proteasome or other cellular processing machineries. The Ub system contributes to the regulation of the production, perception and signal transduction of plant hormones. Jasmonic acid (JA) and its derivatives, known as jasmonates (JAs), act as signaling compounds regulating plant development and plant responses to various biotic and abiotic stress conditions. We provide here an overview of the current understanding of the Ub system involved in JA signaling.
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Affiliation(s)
- Astrid Nagels Durand
- Department of Plant Systems Biology, Vlaams Instituut voor Biotechnologie, B-9052 Ghent, Belgium.
- Department of Plant Biotechnology and Bioinformatics, Ghent University, B-9052 Ghent, Belgium.
| | - Laurens Pauwels
- Department of Plant Systems Biology, Vlaams Instituut voor Biotechnologie, B-9052 Ghent, Belgium.
- Department of Plant Biotechnology and Bioinformatics, Ghent University, B-9052 Ghent, Belgium.
| | - Alain Goossens
- Department of Plant Systems Biology, Vlaams Instituut voor Biotechnologie, B-9052 Ghent, Belgium.
- Department of Plant Biotechnology and Bioinformatics, Ghent University, B-9052 Ghent, Belgium.
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118
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Widemann E, Smirnova E, Aubert Y, Miesch L, Heitz T. Dynamics of Jasmonate Metabolism upon Flowering and across Leaf Stress Responses in Arabidopsis thaliana. PLANTS 2016; 5:plants5010004. [PMID: 27135224 PMCID: PMC4844418 DOI: 10.3390/plants5010004] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/07/2015] [Revised: 12/22/2015] [Accepted: 12/28/2015] [Indexed: 11/16/2022]
Abstract
The jasmonic acid (JA) signaling pathway plays important roles in adaptation of plants to environmental cues and in specific steps of their development, particularly in reproduction. Recent advances in metabolic studies have highlighted intricate mechanisms that govern enzymatic conversions within the jasmonate family. Here we analyzed jasmonate profile changes upon Arabidopsis thaliana flower development and investigated the contribution of catabolic pathways that were known to turnover the active hormonal compound jasmonoyl-isoleucine (JA-Ile) upon leaf stress. We report a rapid decline of JA-Ile upon flower opening, concomitant with the massive accumulation of its most oxidized catabolite, 12COOH-JA-Ile. Detailed genetic analysis identified CYP94C1 as the major player in this process. CYP94C1 is one out of three characterized cytochrome P450 enzymes that define an oxidative JA-Ile turnover pathway, besides a second, hydrolytic pathway represented by the amido-hydrolases IAR3 and ILL6. Expression studies combined with reporter gene analysis revealed the dominant expression of CYP94C1 in mature anthers, consistent with the established role of JA signaling in male fertility. Significant CYP94B1 expression was also evidenced in stamen filaments, but surprisingly, CYP94B1 deficiency was not associated with significant changes in JA profiles. Finally, we compared global flower JA profiles with those previously reported in leaves reacting to mechanical wounding or submitted to infection by the necrotrophic fungus Botrytis cinerea. These comparisons revealed distinct dynamics of JA accumulation and conversions in these three biological systems. Leaf injury boosts a strong and transient JA and JA-Ile accumulation that evolves rapidly into a profile dominated by ω-oxidized and/or Ile-conjugated derivatives. In contrast, B. cinerea-infected leaves contain mostly unconjugated jasmonates, about half of this content being ω-oxidized. Finally, developing flowers present an intermediate situation where young flower buds show detectable jasmonate oxidation (probably originating from stamen metabolism) which becomes exacerbated upon flower opening. Our data illustrate that in spite conserved enzymatic routes, the jasmonate metabolic grid shows considerable flexibility and dynamically equilibrates into specific blends in different physiological situations.
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Affiliation(s)
- Emilie Widemann
- Institut de Biologie Moléculaire des Plantes, CNRS-UPR2357, associée à l'Université de Strasbourg, 12 rue du Général Zimmer, 67084 Strasbourg Cedex, France.
| | - Ekaterina Smirnova
- Institut de Biologie Moléculaire des Plantes, CNRS-UPR2357, associée à l'Université de Strasbourg, 12 rue du Général Zimmer, 67084 Strasbourg Cedex, France.
| | - Yann Aubert
- Institut de Biologie Moléculaire des Plantes, CNRS-UPR2357, associée à l'Université de Strasbourg, 12 rue du Général Zimmer, 67084 Strasbourg Cedex, France.
| | - Laurence Miesch
- Laboratoire de Chimie Organique Synthétique, Unité Mixte de Recherche 7177, Université de Strasbourg, 67008 Strasbourg Cedex, France.
| | - Thierry Heitz
- Institut de Biologie Moléculaire des Plantes, CNRS-UPR2357, associée à l'Université de Strasbourg, 12 rue du Général Zimmer, 67084 Strasbourg Cedex, France.
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119
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Egoshi S, Takaoka Y, Saito H, Nukadzuka Y, Hayashi K, Ishimaru Y, Yamakoshi H, Dodo K, Sodeoka M, Ueda M. Dual function of coronatine as a bacterial virulence factor against plants: possible COI1–JAZ-independent role. RSC Adv 2016. [DOI: 10.1039/c5ra20676f] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
A phytotoxin coronatine has a dual mode of action, triggering stomatal reopening through COI1–JAZ-dependent and independent pathways.
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Affiliation(s)
| | | | - Hiroaki Saito
- Institute of Science and Engineering
- Kanazawa University
- Kanazawa
- Japan
| | | | - Kengo Hayashi
- Department of Chemistry
- Tohoku University
- Aoba-ku
- Japan
| | | | | | - Kosuke Dodo
- Synthetic Organic Chemistry Laboratory
- RIKEN
- Saitama 351-0198
- Japan
| | - Mikiko Sodeoka
- Synthetic Organic Chemistry Laboratory
- RIKEN
- Saitama 351-0198
- Japan
| | - Minoru Ueda
- Department of Chemistry
- Tohoku University
- Aoba-ku
- Japan
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120
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Gleason C, Leelarasamee N, Meldau D, Feussner I. OPDA Has Key Role in Regulating Plant Susceptibility to the Root-Knot Nematode Meloidogyne hapla in Arabidopsis. FRONTIERS IN PLANT SCIENCE 2016; 7:1565. [PMID: 27822219 PMCID: PMC5075541 DOI: 10.3389/fpls.2016.01565] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2016] [Accepted: 10/05/2016] [Indexed: 05/19/2023]
Abstract
Jasmonic acid (JA) is a plant hormone that plays important roles in regulating plant defenses against necrotrophic pathogens and herbivorous insects, but the role of JA in mediating the plant responses to root-knot nematodes has been unclear. Here we show that an application of either methyl jasmonate (MeJA) or the JA-mimic coronatine (COR) on Arabidopsis significantly reduced the number of galls caused by the root-knot nematode Meloidogyne hapla. Interestingly, the MeJA-induced resistance was independent of the JA-receptor COI1 (CORONATINE INSENSITIVE 1). The MeJA-treated plants accumulated the JA precursor cis-(+)-12-oxo-phytodienoic acid (OPDA) in addition to JA/JA-Isoleucine, indicating a positive feedback loop in JA biosynthesis. Using mutants in the JA-biosynthetic pathway, we found that plants deficient in the biosynthesis of JA and OPDA were hyper-susceptible to M. hapla. However, the opr3 mutant, which cannot convert OPDA to JA, exhibited wild-type levels of nematode galling. In addition, mutants in the JA-biosynthesis and perception which lie downstream of opr3 also displayed wild-type levels of galling. The data put OPR3 (OPDA reductase 3) as the branch point between hyper-susceptibility and wild-type like levels of disease. Overall, the data suggests that the JA precursor, OPDA, plays a role in regulating plant defense against nematodes.
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Affiliation(s)
- Cynthia Gleason
- Department of Plant Molecular Biology and Physiology, Georg August University - Albrecht von Haller InstituteGöttingen, Germany
- Department of Plant Molecular Biology and Physiology, Georg August University - Göttingen Center for Molecular BiosciencesGöttingen, Germany
- *Correspondence: Cynthia Gleason,
| | - Natthanon Leelarasamee
- Department of Plant Molecular Biology and Physiology, Georg August University - Albrecht von Haller InstituteGöttingen, Germany
| | - Dorothea Meldau
- Department of Plant Biochemistry, Georg August University - Albrecht von Haller InstituteGöttingen, Germany
| | - Ivo Feussner
- Department of Plant Biochemistry, Georg August University - Albrecht von Haller InstituteGöttingen, Germany
- Department of Plant Biochemistry, Georg August University - Göttingen Center for Molecular BiosciencesGöttingen, Germany
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Abstract
Jasmonates (JAs) constitute a major class of plant regulators that coordinate responses to biotic and abiotic threats and important aspects of plant development. The core biosynthetic pathway converts linolenic acid released from plastid membrane lipids to the cyclopentenone cis-oxo-phytodienoic acid (OPDA) that is further reduced and shortened to jasmonic acid (JA) in peroxisomes. Abundant pools of OPDA esterified to plastid lipids also occur upon stress, mainly in the Arabidopsis genus. Long thought to be the bioactive hormone, JA only gains its pleiotropic hormonal properties upon conjugation into jasmonoyl-isoleucine (JA-Ile). The signaling pathway triggered when JA-Ile promotes the assembly of COI1-JAZ (Coronatine Insensitive 1-JAsmonate Zim domain) co-receptor complexes has been the focus of most recent research in the jasmonate field. In parallel, OPDA and several other JA derivatives are recognized for their separate activities and contribute to the diversity of jasmonate action in plant physiology. We summarize in this chapter the properties of different bioactive JAs and review elements known for their perception and signal transduction. Much progress has also been gained on the enzymatic processes governing JA-Ile removal. Two JA-Ile catabolic pathways, operating through ω-oxidation (cytochromes P450) or conjugate cleavage (amido hydrolases) shape signal dynamics to allow optimal control on defense. JA-Ile turnover not only participates in signal attenuation, but also impact the homeostasis of the entire JA metabolic pathway.
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122
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Cai XT, Xu P, Wang Y, Xiang CB. Activated expression of AtEDT1/HDG11 promotes lateral root formation in Arabidopsis mutant edt1 by upregulating jasmonate biosynthesis. JOURNAL OF INTEGRATIVE PLANT BIOLOGY 2015; 57:1017-30. [PMID: 25752924 DOI: 10.1111/jipb.12347] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2014] [Accepted: 03/02/2015] [Indexed: 05/11/2023]
Abstract
Root architecture is crucial for plants to absorb water and nutrients. We previously reported edt1 (edt1D) mutant with altered root architecture that contributes significantly to drought resistance. However, the underlying molecular mechanisms are not well understood. Here we report one of the mechanisms underlying EDT1/HDG11-conferred altered root architecture. Root transcriptome comparison between the wild type and edt1D revealed that the upregulated genes involved in jasmonate biosynthesis and signaling pathway were enriched in edt1D root, which were confirmed by quantitative RT-PCR. Further analysis showed that EDT1/HDG11, as a transcription factor, bound directly to the HD binding sites in the promoters of AOS, AOC3, OPR3, and OPCL1, which encode four key enzymes in JA biosynthesis. We found that the jasmonic acid level was significantly elevated in edt1D root compared with that in the wild type subsequently. In addition, more auxin accumulation was observed in the lateral root primordium of edt1D compared with that of wild type. Genetic analysis of edt1D opcl1 double mutant also showed that HDG11 was partially dependent on JA in regulating LR formation. Taken together, overexpression of EDT1/HDG11 increases JA level in the root of edt1D by directly upregulating the expressions of several genes encoding JA biosynthesis enzymes to activate auxin signaling and promote lateral root formation.
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Affiliation(s)
- Xiao-Teng Cai
- School of Life Sciences, University of Science and Technology of China, Hefei 230027, China
| | - Ping Xu
- School of Life Sciences, University of Science and Technology of China, Hefei 230027, China
| | - Yao Wang
- School of Life Sciences, University of Science and Technology of China, Hefei 230027, China
| | - Cheng-Bin Xiang
- School of Life Sciences, University of Science and Technology of China, Hefei 230027, China
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123
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Riemann M, Dhakarey R, Hazman M, Miro B, Kohli A, Nick P. Exploring Jasmonates in the Hormonal Network of Drought and Salinity Responses. FRONTIERS IN PLANT SCIENCE 2015; 6:1077. [PMID: 26648959 PMCID: PMC4665137 DOI: 10.3389/fpls.2015.01077] [Citation(s) in RCA: 132] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2015] [Accepted: 11/17/2015] [Indexed: 05/18/2023]
Abstract
Present and future food security is a critical issue compounded by the consequences of climate change on agriculture. Stress perception and signal transduction in plants causes changes in gene or protein expression which lead to metabolic and physiological responses. Phytohormones play a central role in the integration of different upstream signals into different adaptive outputs such as changes in the activity of ion-channels, protein modifications, protein degradation, and gene expression. Phytohormone biosynthesis and signaling, and recently also phytohormone crosstalk have been investigated intensively, but the function of jasmonates under abiotic stress is still only partially understood. Although most aspects of jasmonate biosynthesis, crosstalk and signal transduction appear to be similar for biotic and abiotic stress, novel aspects have emerged that seem to be unique for the abiotic stress response. Here, we review the knowledge on the role of jasmonates under drought and salinity. The crosstalk of jasmonate biosynthesis and signal transduction pathways with those of abscisic acid (ABA) is particularly taken into account due to the well-established, central role of ABA under abiotic stress. Likewise, the accumulating evidence of crosstalk of jasmonate signaling with other phytohormones is considered as important element of an integrated phytohormonal response. Finally, protein post-translational modification, which can also occur without de novo transcription, is treated with respect to its implications for phytohormone biosynthesis, signaling and crosstalk. To breed climate-resilient crop varieties, integrated understanding of the molecular processes is required to modulate and tailor particular nodes of the network to positively affect stress tolerance.
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Affiliation(s)
- Michael Riemann
- Molecular Cell Biology, Institute of Botany, Karlsruhe Institute of Technology, Karlsruhe, Germany
| | - Rohit Dhakarey
- Molecular Cell Biology, Institute of Botany, Karlsruhe Institute of Technology, Karlsruhe, Germany
| | - Mohamed Hazman
- Molecular Cell Biology, Institute of Botany, Karlsruhe Institute of Technology, Karlsruhe, Germany
| | - Berta Miro
- Plant Breeding Genetics and Biotechnology Division, International Rice Research Institute, Makati, Philippines
| | - Ajay Kohli
- Plant Breeding Genetics and Biotechnology Division, International Rice Research Institute, Makati, Philippines
| | - Peter Nick
- Molecular Cell Biology, Institute of Botany, Karlsruhe Institute of Technology, Karlsruhe, Germany
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Srivastava AK, Senapati D, Srivastava A, Chakraborty M, Gangappa SN, Chattopadhyay S. Short Hypocotyl in White Light1 Interacts with Elongated Hypocotyl5 (HY5) and Constitutive Photomorphogenic1 (COP1) and Promotes COP1-Mediated Degradation of HY5 during Arabidopsis Seedling Development. PLANT PHYSIOLOGY 2015; 169:2922-34. [PMID: 26474641 PMCID: PMC4677909 DOI: 10.1104/pp.15.01184] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2015] [Accepted: 10/13/2015] [Indexed: 05/18/2023]
Abstract
Arabidopsis (Arabidopsis thaliana) Short Hypocotyl in White Light1 (SHW1) encodes a Ser-Arg-Asp-rich protein that acts as a negative regulator of photomorphogenesis. SHW1 and Constitutive Photomorphogenic1 (COP1) genetically interact in an additive manner to suppress photomorphogenesis. Elongated Hypocotyl5 (HY5) is a photomorphogenesis promoting a basic leucine zipper transcription factor that is degraded by COP1 ubiquitin ligase in the darkness. Here, we report the functional interrelation of SHW1 with COP1 and HY5 in Arabidopsis seedling development. The in vitro and in vivo molecular interaction studies show that SHW1 physically interacts with both COP1 and HY5. The genetic studies reveal that SHW1 and HY5 work in an antagonistic manner to regulate photomorphogenic growth. Additional mutation of SHW1 in hy5 mutant background is able to suppress the gravitropic root growth defect of hy5 mutants. This study further reveals that the altered abscisic acid responsiveness of hy5 mutants is modulated by additional loss of SHW1 function. Furthermore, this study shows that SHW1 promotes COP1-mediated degradation of HY5 through enhanced ubiquitylation in the darkness. Collectively, this study highlights a mechanistic view on coordinated regulation of SHW1, COP1, and HY5 in Arabidopsis seedling development.
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Affiliation(s)
| | - Dhirodatta Senapati
- Department of Biotechnology, National Institute of Technology, Durgapur 713209, India
| | - Archana Srivastava
- Department of Biotechnology, National Institute of Technology, Durgapur 713209, India
| | - Moumita Chakraborty
- Department of Biotechnology, National Institute of Technology, Durgapur 713209, India
| | | | - Sudip Chattopadhyay
- Department of Biotechnology, National Institute of Technology, Durgapur 713209, India
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125
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Wasternack C, Strnad M. Jasmonate signaling in plant stress responses and development - active and inactive compounds. N Biotechnol 2015; 33:604-613. [PMID: 26581489 DOI: 10.1016/j.nbt.2015.11.001] [Citation(s) in RCA: 113] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2015] [Revised: 10/21/2015] [Accepted: 11/04/2015] [Indexed: 12/28/2022]
Abstract
Jasmonates (JAs) are lipid-derived signals mediating plant responses to biotic and abiotic stresses and in plant development. Following the elucidation of each step in their biosynthesis and the important components of perception and signaling, several activators, repressors and co-repressors have been identified which contribute to fine-tuning the regulation of JA-induced gene expression. Many of the metabolic reactions in which JA participates, such as conjugation with amino acids, glucosylation, hydroxylation, carboxylation, sulfation and methylation, lead to numerous compounds with different biological activities. These metabolites may be highly active, partially active in specific processes or inactive. Hydroxylation, carboxylation and sulfation inactivate JA signaling. The precursor of JA biosynthesis, 12-oxo-phytodienoic acid (OPDA), has been identified as a JA-independent signaling compound. An increasing number of OPDA-specific processes is being identified. To conclude, the numerous JA compounds and their different modes of action allow plants to respond specifically and flexibly to alterations in the environment.
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Affiliation(s)
- Claus Wasternack
- Laboratory of Growth Regulators, Centre of the Region Haná for Biotechnological and Agricultural Research, Palacký University, Institute of Experimental Botany AS CR, Šlechtitelů 11, CZ 78371 Olomouc, Czech Republic.
| | - Miroslav Strnad
- Laboratory of Growth Regulators, Centre of the Region Haná for Biotechnological and Agricultural Research, Palacký University, Institute of Experimental Botany AS CR, Šlechtitelů 11, CZ 78371 Olomouc, Czech Republic
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126
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Shahzad R, Waqas M, Khan AL, Hamayun M, Kang SM, Lee IJ. Foliar application of methyl jasmonate induced physio-hormonal changes in Pisum sativum under diverse temperature regimes. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2015; 96:406-16. [PMID: 26379199 DOI: 10.1016/j.plaphy.2015.08.020] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2015] [Revised: 07/15/2015] [Accepted: 08/25/2015] [Indexed: 05/26/2023]
Abstract
Global climate change brings with it unwarranted shifts in both abiotic (heat stress, cold stress, wind, precipitation) and biotic (pathogens, pests) environmental factors, thus posing a threat to agricultural productivity across the world. In plants, lodging due to storms or herbivory causes wounding stress and consequently enhances endogenous jasmonates. In response, the plant growth is arrested as plant defense is prioritized. We pre-treated pea plants with elevated methyl jasmonate (MeJA) levels i.e. 50 μM, 100 μM and 200 μM under controlled growth chamber conditions. The pre-treated plants were then kept at 40 °C (heat stress--HS), 4 °C (cold stress--CS) and 20 °C (optimum/control temperature--OT) for 72 h. The effect of such treatments on plant growth attributes, photosynthesis, stomatal conductance, cell death rate, and regulation of endogenous hormones were observed. Elevated MeJA application hindered plant growth attributes under HS, CS and OT conditions. Moreover, elevated MeJA levels lowered the rate of photosynthesis and stomatal conductance, induced stomatal closure, caused higher cells mortality in leaves under HS, CS, and OT conditions. Endogenous ABA contents significantly declined in all MeJA treatments under HS and OT, but increased under CS conditions. Exogenous MeJA enhanced endogenous jasmonic acid contents of pea plants, but altered endogenous salicylic acid contents under varying temperatures. Current study shows that higher concentrations of exogenous MeJA strengthen plant defense mechanism by hindering plant growth under stress conditions.
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Affiliation(s)
- Raheem Shahzad
- School of Applied Biosciences, Kyungpook National University, Daegu, Republic of Korea
| | - Muhammad Waqas
- School of Applied Biosciences, Kyungpook National University, Daegu, Republic of Korea; Department of Agriculture Extension, Buner 19290, Pakistan
| | - Abdul Latif Khan
- UoN Chair of Oman's Medicinal Plants & Marine Natural Products, University of Nizwa, 616 Nizwa, Oman
| | - Muhammad Hamayun
- School of Applied Biosciences, Kyungpook National University, Daegu, Republic of Korea; Department of Botany, Abdul Wali Khan University Mardan, Pakistan
| | - Sang-Mo Kang
- School of Applied Biosciences, Kyungpook National University, Daegu, Republic of Korea
| | - In-Jung Lee
- School of Applied Biosciences, Kyungpook National University, Daegu, Republic of Korea.
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127
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Liang J, Wang Y, Ding G, Li W, Yang G, He N. Biotic stress-induced expression of mulberry cystatins and identification of cystatin exhibiting stability to silkworm gut proteinases. PLANTA 2015; 242:1139-1151. [PMID: 26070440 DOI: 10.1007/s00425-015-2345-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2014] [Accepted: 06/01/2015] [Indexed: 06/04/2023]
Abstract
Biotic stresses induce the expression of mulberry cystatins. MaCPI-4 protein is stable in silkworm digestive fluid and accumulates in gut food debris and frass. Plant cystatins are considered to be involved in defense responses to insect herbivores though little is known about how cystatins from the natural host respond to a specialist herbivory and the following postingestive interaction is also poorly understood. Here, we studied the biotic stress-mediated inductions of cystatins from mulberry tree, and examined the stability of mulberry cystatin proteins in the gut of silkworm, Bombyx mori, a specialist insect feeding on mulberry leaf. First, we cloned and characterized six cystatin genes from a mulberry cultivar, Morus atropurpurea Roxb., named as MaCPI-1 to MaCPI-6. The recombinant MaCPI-1, MaCPI-3 and MaCPI-4 proteins, which showed inhibitory effects against papain in vitro, were produced. Silkworm herbivory as well as methyl jasmonate (MeJA) treatment induced the expression of five mulberry cystatin genes, and the highest inductions were observed from MaCPI-1 and MaCPI-6. Mechanical wounding led to the inductions of four cystatin genes. The differential induction occurred in MaCPI-2. The induced protein changes were detected from three mulberry cystatins comprising MaCPI-1, MaCPI-3 and MaCPI-4. In vivo and in vitro assays showed that MaCPI-1 and MaCPI-3 proteins were susceptible to silkworm digestive fluid and MaCPI-4 had an antidigestive stability, and was detected in silkworm gut and frass. Collectively, our data indicated that biotic stresses resulted in the transcriptional inductions and protein changes of mulberry cystatins (MaCPIs), and identified MaCPI-4 with stability in the gut of its specialist herbivore.
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Affiliation(s)
- Jiubo Liang
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, 400715, China.
| | - Yupeng Wang
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, 400715, China.
| | - Guangyu Ding
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, 400715, China.
| | - Wensheng Li
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, 400715, China.
| | - Guangwei Yang
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, 400715, China.
| | - Ningjia He
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, 400715, China.
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128
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Gauthier L, Atanasova-Penichon V, Chéreau S, Richard-Forget F. Metabolomics to Decipher the Chemical Defense of Cereals against Fusarium graminearum and Deoxynivalenol Accumulation. Int J Mol Sci 2015; 16:24839-72. [PMID: 26492237 PMCID: PMC4632779 DOI: 10.3390/ijms161024839] [Citation(s) in RCA: 57] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2015] [Revised: 09/08/2015] [Accepted: 10/11/2015] [Indexed: 12/21/2022] Open
Abstract
Fusarium graminearum is the causal agent of Fusarium head blight (FHB) and Gibberella ear rot (GER), two devastating diseases of wheat, barley, and maize. Furthermore, F. graminearum species can produce type B trichothecene mycotoxins that accumulate in grains. Use of FHB and GER resistant cultivars is one of the most promising strategies to reduce damage induced by F. graminearum. Combined with genetic approaches, metabolomic ones can provide powerful opportunities for plant breeding through the identification of resistant biomarker metabolites which have the advantage of integrating the genetic background and the influence of the environment. In the past decade, several metabolomics attempts have been made to decipher the chemical defense that cereals employ to counteract F. graminearum. By covering the major classes of metabolites that have been highlighted and addressing their potential role, this review demonstrates the complex and integrated network of events that cereals can orchestrate to resist to F. graminearum.
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Affiliation(s)
- Léa Gauthier
- Euralis, Domaine de Sandreau, 6 chemin de Panedeautes, Mondonville CS 60224, 31705 Blagnac Cedex, France.
- INRA, UR1264 MycSA, 71 avenue Edouard Bourleaux, CS20032, 33882 Villenave d'Ornon Cedex, France.
| | | | - Sylvain Chéreau
- INRA, UR1264 MycSA, 71 avenue Edouard Bourleaux, CS20032, 33882 Villenave d'Ornon Cedex, France.
| | - Florence Richard-Forget
- INRA, UR1264 MycSA, 71 avenue Edouard Bourleaux, CS20032, 33882 Villenave d'Ornon Cedex, France.
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129
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Ling Z, Zhou W, Baldwin IT, Xu S. Insect herbivory elicits genome-wide alternative splicing responses in Nicotiana attenuata. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2015; 84:228-43. [PMID: 26306554 DOI: 10.1111/tpj.12997] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2015] [Revised: 08/04/2015] [Accepted: 08/11/2015] [Indexed: 05/06/2023]
Abstract
Changes in gene expression and alternative splicing (AS) are involved in many responses to abiotic and biotic stresses in eukaryotic organisms. In response to attack and oviposition by insect herbivores, plants elicit rapid changes in gene expression which are essential for the activation of plant defenses; however, the herbivory-induced changes in AS remain unstudied. Using mRNA sequencing, we performed a genome-wide analysis on tobacco hornworm (Manduca sexta) feeding-induced AS in both leaves and roots of Nicotiana attenuata. Feeding by M. sexta for 5 h reduced total AS events by 7.3% in leaves but increased them in roots by 8.0% and significantly changed AS patterns in leaves and roots of existing AS genes. Feeding by M. sexta also resulted in increased (in roots) and decreased (in leaves) transcript levels of the serine/arginine-rich (SR) proteins that are involved in the AS machinery of plants and induced changes in SR gene expression that were jasmonic acid (JA)-independent in leaves but JA-dependent in roots. Changes in AS and gene expression elicited by M. sexta feeding were regulated independently in both tissues. This study provides genome-wide evidence that insect herbivory induces changes not only in the levels of gene expression but also in their splicing, which might contribute to defense against and/or tolerance of herbivory.
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Affiliation(s)
- Zhihao Ling
- Department of Molecular Ecology, Max Planck Institute for Chemical Ecology, Hans-Knöll-Straße 8, D-07745, Jena, Germany
| | - Wenwu Zhou
- Department of Molecular Ecology, Max Planck Institute for Chemical Ecology, Hans-Knöll-Straße 8, D-07745, Jena, Germany
| | - Ian T Baldwin
- Department of Molecular Ecology, Max Planck Institute for Chemical Ecology, Hans-Knöll-Straße 8, D-07745, Jena, Germany
| | - Shuqing Xu
- Department of Molecular Ecology, Max Planck Institute for Chemical Ecology, Hans-Knöll-Straße 8, D-07745, Jena, Germany
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130
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Glowacz M, Rees D. Using jasmonates and salicylates to reduce losses within the fruit supply chain. Eur Food Res Technol 2015. [DOI: 10.1007/s00217-015-2527-6] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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131
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Yastreb TO, Kolupaev YE, Shvidenko NV, Lugovaya AA, Dmitriev AP. Salt stress response in Arabidopsis thaliana plants with defective jasmonate signaling. APPL BIOCHEM MICRO+ 2015. [DOI: 10.1134/s000368381504016x] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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132
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Xue R, Wu J, Zhu Z, Wang L, Wang X, Wang S, Blair MW. Differentially Expressed Genes in Resistant and Susceptible Common Bean (Phaseolus vulgaris L.) Genotypes in Response to Fusarium oxysporum f. sp. phaseoli. PLoS One 2015; 10:e0127698. [PMID: 26030070 PMCID: PMC4452237 DOI: 10.1371/journal.pone.0127698] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2014] [Accepted: 04/17/2015] [Indexed: 01/12/2023] Open
Abstract
Fusarium wilt of common bean (Phaseolus vulgaris L.), caused by Fusarium oxysporum Schlechtend.:Fr. f.sp. phaseoli (Fop), is one of the most important diseases of common beans worldwide. Few natural sources of resistance to Fop exist and provide only moderate or partial levels of protection. Despite the economic importance of the disease across multiple crops, only a few of Fop induced genes have been analyzed in legumes. Therefore, our goal was to identify transcriptionally regulated genes during an incompatible interaction between common bean and the Fop pathogen using the cDNA amplified fragment length polymorphism (cDNA-AFLP) technique. We generated a total of 8,730 transcript-derived fragments (TDFs) with 768 primer pairs based on the comparison of a moderately resistant and a susceptible genotype. In total, 423 TDFs (4.9%) displayed altered expression patterns after inoculation with Fop inoculum. We obtained full amplicon sequences for 122 selected TDFs, of which 98 were identified as annotated known genes in different functional categories based on their putative functions, 10 were predicted but non-annotated genes and 14 were not homologous to any known genes. The 98 TDFs encoding genes of known putative function were classified as related to metabolism (22), signal transduction (21), protein synthesis and processing (20), development and cytoskeletal organization (12), transport of proteins (7), gene expression and RNA metabolism (4), redox reactions (4), defense and stress responses (3), energy metabolism (3), and hormone responses (2). Based on the analyses of homology, 19 TDFs from different functional categories were chosen for expression analysis using quantitative RT-PCR. The genes found to be important here were implicated at various steps of pathogen infection and will allow a better understanding of the mechanisms of defense and resistance to Fop and similar pathogens. The differential response genes discovered here could also be used as molecular markers in association mapping or QTL analysis.
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Affiliation(s)
- Renfeng Xue
- Crop Research Institute, Liaoning Academy of Agricultural Sciences, Shenyang, People’s Republic of China
- National Key Facility for Crop Gene Resources and Genetic Improvement, Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing, People’s Republic of China
| | - Jing Wu
- National Key Facility for Crop Gene Resources and Genetic Improvement, Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing, People’s Republic of China
| | - Zhendong Zhu
- National Key Facility for Crop Gene Resources and Genetic Improvement, Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing, People’s Republic of China
| | - Lanfen Wang
- National Key Facility for Crop Gene Resources and Genetic Improvement, Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing, People’s Republic of China
| | - Xiaoming Wang
- National Key Facility for Crop Gene Resources and Genetic Improvement, Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing, People’s Republic of China
| | - Shumin Wang
- National Key Facility for Crop Gene Resources and Genetic Improvement, Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing, People’s Republic of China
- * E-mail: (SW); (MWB)
| | - Matthew W. Blair
- Department of Agricultural and Environmental Sciences, Tennessee State University, Nashville, Tennessee, United States of America
- * E-mail: (SW); (MWB)
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133
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Goossens J, Swinnen G, Vanden Bossche R, Pauwels L, Goossens A. Change of a conserved amino acid in the MYC2 and MYC3 transcription factors leads to release of JAZ repression and increased activity. THE NEW PHYTOLOGIST 2015; 206:1229-37. [PMID: 25817565 DOI: 10.1111/nph.13398] [Citation(s) in RCA: 57] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2014] [Accepted: 03/05/2015] [Indexed: 05/22/2023]
Abstract
The bHLH transcription factor MYC2, together with its paralogues MYC3 and MYC4, is a master regulator of the response to the jasmonate (JA) hormone in Arabidopsis (Arabidopsis thaliana). In the absence of JA, JASMONATE ZIM (JAZ) proteins interact with the MYC proteins to block their activity. Understanding of the mechanism and specificity of this interaction is key to unravel JA signalling. We generated mutant MYC proteins and assessed their activity and the specificity of their interaction with the 12 Arabidopsis JAZ proteins. We show that the D94N mutation present in the atr2D allele of MYC3 abolishes the interaction between MYC3 and most JAZ proteins. The same effect is observed when the corresponding conserved Asp (D105) was mutated in MYC2. Accordingly, MYC2(D105N) activated target genes in the presence of JAZ proteins, in contrast to wild-type MYC2. JAZ1 and JAZ10 were the only JAZ proteins still showing interaction with the mutant MYC proteins, due to a second MYC interaction domain, besides the classical Jas domain. Our results visualize the divergence among JAZ proteins in their interaction with MYC proteins. Ultimately, the transferability of the Asp-to-Asn amino acid change might facilitate the design of hyperactive transcription factors for plant engineering.
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Affiliation(s)
- Jonas Goossens
- Department of Plant Systems Biology, Flanders Institute for Biotechnology (VIB), B-9052, Gent, Belgium
- Department of Plant Biotechnology and Bioinformatics, Ghent University, B-9052, Gent, Belgium
| | - Gwen Swinnen
- Department of Plant Systems Biology, Flanders Institute for Biotechnology (VIB), B-9052, Gent, Belgium
- Department of Plant Biotechnology and Bioinformatics, Ghent University, B-9052, Gent, Belgium
| | - Robin Vanden Bossche
- Department of Plant Systems Biology, Flanders Institute for Biotechnology (VIB), B-9052, Gent, Belgium
- Department of Plant Biotechnology and Bioinformatics, Ghent University, B-9052, Gent, Belgium
| | - Laurens Pauwels
- Department of Plant Systems Biology, Flanders Institute for Biotechnology (VIB), B-9052, Gent, Belgium
- Department of Plant Biotechnology and Bioinformatics, Ghent University, B-9052, Gent, Belgium
| | - Alain Goossens
- Department of Plant Systems Biology, Flanders Institute for Biotechnology (VIB), B-9052, Gent, Belgium
- Department of Plant Biotechnology and Bioinformatics, Ghent University, B-9052, Gent, Belgium
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134
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Thatcher LF, Kamphuis LG, Hane JK, Oñate-Sánchez L, Singh KB. The Arabidopsis KH-Domain RNA-Binding Protein ESR1 Functions in Components of Jasmonate Signalling, Unlinking Growth Restraint and Resistance to Stress. PLoS One 2015; 10:e0126978. [PMID: 25985302 PMCID: PMC4436139 DOI: 10.1371/journal.pone.0126978] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2015] [Accepted: 04/09/2015] [Indexed: 11/25/2022] Open
Abstract
Glutathione S-transferases (GSTs) play important roles in the protection of cells against toxins and oxidative damage where one Arabidopsis member, GSTF8, has become a commonly used marker gene for early stress and defense responses. A GSTF8 promoter fragment fused to the luciferase reporter gene was used in a forward genetic screen for Arabidopsis mutants with up-regulated GSTF8 promoter activity. This identified the esr1-1 (enhanced stress response 1) mutant which also conferred increased resistance to the fungal pathogen Fusarium oxysporum. Through positional cloning, the ESR1 gene was found to encode a KH-domain containing RNA-binding protein (At5g53060). Whole transcriptome sequencing of esr1-1 identified altered expression of genes involved in responses to biotic and abiotic stimuli, hormone signaling pathways and developmental processes. In particular was an overall significant enrichment for jasmonic acid (JA) mediated processes in the esr1-1 down-regulated dataset. A subset of these genes were tested for MeJA inducibility and we found the expression of some but not all were reduced in esr1-1. The esr1-1 mutant was not impaired in other aspects of JA-signalling such as JA- sensitivity or development, suggesting ESR1 functions in specific components of the JA-signaling pathway. Examination of salicylic acid (SA) regulated marker genes in esr1-1 showed no increase in basal or SA induced expression suggesting repression of JA-regulated genes is not due to antagonistic SA-JA crosstalk. These results define new roles for KH-domain containing proteins with ESR1 unlinking JA-mediated growth and defense responses.
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Affiliation(s)
- Louise F. Thatcher
- CSIRO Agriculture Flagship, Centre for Environment and Life Sciences, Wembley, Western Australia, Australia
| | - Lars G. Kamphuis
- CSIRO Agriculture Flagship, Centre for Environment and Life Sciences, Wembley, Western Australia, Australia
- The Institute of Agriculture, The University of Western Australia, Crawley, Western Australia, Australia
| | - James K. Hane
- CSIRO Agriculture Flagship, Centre for Environment and Life Sciences, Wembley, Western Australia, Australia
| | - Luis Oñate-Sánchez
- CSIRO Agriculture Flagship, Centre for Environment and Life Sciences, Wembley, Western Australia, Australia
| | - Karam B. Singh
- CSIRO Agriculture Flagship, Centre for Environment and Life Sciences, Wembley, Western Australia, Australia
- The Institute of Agriculture, The University of Western Australia, Crawley, Western Australia, Australia
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135
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Kazan K. Diverse roles of jasmonates and ethylene in abiotic stress tolerance. TRENDS IN PLANT SCIENCE 2015; 20:219-29. [PMID: 25731753 DOI: 10.1016/j.tplants.2015.02.001] [Citation(s) in RCA: 410] [Impact Index Per Article: 45.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2014] [Revised: 01/25/2015] [Accepted: 02/01/2015] [Indexed: 05/18/2023]
Abstract
Jasmonates (JAs) and ethylene (ET), often acting cooperatively, play essential roles in regulating plant defense against pests and pathogens. Recent research reviewed here has revealed mechanistic new insights into the mode of action of these hormones in plant abiotic stress tolerance. During cold stress, JAs and ET differentially regulate the C-repeat binding factor (CBF) pathway. Major JA and ET signaling hubs such as JAZ proteins, CTR1, MYC2, components of the mediator complex, EIN2, EIN3, and several members of the AP2/ERF transcription factor gene family all have complex regulatory roles during abiotic stress adaptation. Better understanding the roles of these phytohormones in plant abiotic stress tolerance will contribute to the development of crop plants tolerant to a wide range of stressful environments.
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Affiliation(s)
- Kemal Kazan
- Commonwealth Scientific and Industrial Research Organization (CSIRO), Agriculture Flagship, Queensland Bioscience Precinct, Brisbane, Queensland, Australia; The Queensland Alliance for Agriculture and Food Innovation (QAAFI), The University of Queensland, Queensland Bioscience Precinct, Brisbane, Queensland, Australia.
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136
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Brossa R, Pintó-Marijuan M, Francisco R, López-Carbonell M, Chaves MM, Alegre L. Redox proteomics and physiological responses in Cistus albidus shrubs subjected to long-term summer drought followed by recovery. PLANTA 2015; 241:803-22. [PMID: 25502480 PMCID: PMC4361772 DOI: 10.1007/s00425-014-2221-0] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2014] [Accepted: 12/02/2014] [Indexed: 05/23/2023]
Abstract
The interaction between enzymatic and non-enzymatic antioxidants, endogenous levels of ABA and ABA-GE, the rapid recuperation of photosynthetic proteins under re-watering as well the high level of antioxidant proteins in previously drought-stressed plants under re-watering conditions, will contribute to drought resistance in plants subjected to a long-term drought stress under Mediterranean field conditions. This work provides an overview of the mechanisms of Cistus albidus acclimation to long-term summer drought followed by re-watering in Mediterranean field conditions. To better understand the molecular mechanisms of drought resistance in these plants, a proteomic study using 2-DE and MALDI-TOF/TOF MS/MS was performed on leaves from these shrubs. The analysis identified 57 differentially expressed proteins in water-stressed plants when contrasted to well watered. Water-stressed plants showed an increase, both qualitatively and quantitatively, in HSPs, and downregulation of photosynthesis and carbon metabolism enzymes. Under drought conditions, there was considerable upregulation of enzymes related to redox homeostasis, DHA reductase, Glyoxalase, SOD and isoflavone reductase. However, upregulation of catalase was not observed until after re-watering was carried out. Drought treatment caused an enhancement in antioxidant defense responses that can be modulated by ABA, and its catabolites, ABA-GE, as well as JA. Furthermore, quantification of protein carbonylation was shown to be a useful marker of the relationship between water and oxidative stress, and showed that there was only moderate oxidative stress in C. albidus plants subjected to water stress. After re-watering plants recovered although the levels of ABA-GE and antioxidant enzymes still remain higher than in well-watered plants. We expect that our results will provide new data on summer acclimation to drought stress in Mediterranean shrubs.
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Affiliation(s)
- Ricard Brossa
- Departament de Biologia Vegetal, Facultat de Biologia, Universitat de Barcelona, Avda. Diagonal 643, 08028 Barcelona, Spain
| | - Marta Pintó-Marijuan
- Departament de Biologia Vegetal, Facultat de Biologia, Universitat de Barcelona, Avda. Diagonal 643, 08028 Barcelona, Spain
- Molecular Ecophysiology Lab. (LEM), Instituto de Tecnologia Química e Biológica, Universidade Nova de Lisboa, 2780-901 Oeiras, Portugal
| | - Rita Francisco
- Molecular Ecophysiology Lab. (LEM), Instituto de Tecnologia Química e Biológica, Universidade Nova de Lisboa, 2780-901 Oeiras, Portugal
| | - Marta López-Carbonell
- Departament de Biologia Vegetal, Facultat de Biologia, Universitat de Barcelona, Avda. Diagonal 643, 08028 Barcelona, Spain
| | - Maria Manuela Chaves
- Molecular Ecophysiology Lab. (LEM), Instituto de Tecnologia Química e Biológica, Universidade Nova de Lisboa, 2780-901 Oeiras, Portugal
| | - Leonor Alegre
- Departament de Biologia Vegetal, Facultat de Biologia, Universitat de Barcelona, Avda. Diagonal 643, 08028 Barcelona, Spain
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137
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Wang F, Lin R, Feng J, Chen W, Qiu D, Xu S. TaNAC1 acts as a negative regulator of stripe rust resistance in wheat, enhances susceptibility to Pseudomonas syringae, and promotes lateral root development in transgenic Arabidopsis thaliana. FRONTIERS IN PLANT SCIENCE 2015; 6:108. [PMID: 25774162 PMCID: PMC4342887 DOI: 10.3389/fpls.2015.00108] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2014] [Accepted: 02/10/2015] [Indexed: 05/20/2023]
Abstract
Plant-specific NAC transcription factors (TFs) constitute a large family and play important roles in regulating plant developmental processes and responses to environmental stresses, but only some of them have been investigated for effects on disease reaction in cereal crops. Virus-induced gene silencing (VIGS) is an effective strategy for rapid functional analysis of genes in plant tissues. In this study, TaNAC1, encoding a new member of the NAC1 subgroup, was cloned from bread wheat and characterized. It is a TF localized in the cell nucleus, and contains an activation domain in its C-terminal. TaNAC1 was strongly expressed in wheat roots and was involved in responses to infection by the obligate pathogen Puccinia striiformis f. sp. tritici and defense-related hormone treatments such as salicylic acid (SA), methyl jasmonate, and ethylene. Knockdown of TaNAC1 with barley stripe mosaic virus-induced gene silencing (BSMV-VIGS) enhanced stripe rust resistance. TaNAC1-overexpression in Arabidopsis thaliana plants gave enhanced susceptibility, attenuated systemic-acquired resistance to Pseudomonas syringae DC3000, and promoted lateral root development. Jasmonic acid-signaling pathway genes PDF1.2 and ORA59 were constitutively expressed in transgenic plants. TaNAC1 overexpression suppressed the expression levels of resistance-related genes PR1 and PR2 involved in SA signaling and AtWRKY70, which functions as a connection node between the JA- and SA-signaling pathways. Collectively, TaNAC1 is a novel NAC member of the NAC1 subgroup, negatively regulates plant disease resistance, and may modulate plant JA- and SA-signaling defense cascades.
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Affiliation(s)
| | - Ruiming Lin
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural SciencesBeijing, China
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138
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Yang YX, Wang MM, Yin YL, Onac E, Zhou GF, Peng S, Xia XJ, Shi K, Yu JQ, Zhou YH. RNA-seq analysis reveals the role of red light in resistance against Pseudomonas syringae pv. tomato DC3000 in tomato plants. BMC Genomics 2015; 16:120. [PMID: 25765075 PMCID: PMC4349473 DOI: 10.1186/s12864-015-1228-7] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2014] [Accepted: 01/09/2015] [Indexed: 01/21/2023] Open
Abstract
BACKGROUND Plants attenuate their responses to a variety of bacterial and fungal pathogens, leading to higher incidences of pathogen infection at night. However, little is known about the molecular mechanism responsible for the light-induced defence response; transcriptome data would likely facilitate the elucidation of this mechanism. RESULTS In this study, we observed diurnal changes in tomato resistance to Pseudomonas syringae pv. tomato DC3000 (Pto DC3000), with the greatest susceptibility before midnight. Nightly light treatment, particularly red light treatment, significantly enhanced the resistance; this effect was correlated with increased salicylic acid (SA) accumulation and defence-related gene transcription. RNA-seq analysis revealed that red light induced a set of circadian rhythm-related genes involved in the phytochrome and SA-regulated resistance response. The biosynthesis and signalling pathways of multiple plant hormones (auxin, SA, jasmonate, and ethylene) were co-ordinately regulated following Pto DC3000 infection and red light, and the SA pathway was most significantly affected by red light and Pto DC3000 infection. This result indicates that SA-mediated signalling pathways are involved in red light-induced resistance to pathogens. Importantly, silencing of nonexpressor of pathogensis-related genes 1 (NPR1) partially compromised red light-induced resistance against Pto DC3000. Furthermore, sets of genes involved in redox homeostasis (respiratory burst oxidase homologue, RBOH; glutathione S-transferases, GSTs; glycosyltransferase, GTs), calcium (calmodulin, CAM; calmodulin-binding protein, CBP), and defence (polyphenol oxidase, PPO; nudix hydrolase1, NUDX1) as well as transcription factors (WRKY18, WRKY53, WRKY60, WRKY70) and cellulose synthase were differentially induced at the transcriptional level by red light in response to pathogen challenge. CONCLUSIONS Taken together, our results suggest that there is a diurnal change in susceptibility to Pto DC3000 with greatest susceptibility in the evening. The red light induced-resistance to Pto DC3000 at night is associated with enhancement of the SA pathway, cellulose synthase, and reduced redox homeostasis.
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Affiliation(s)
- You-Xin Yang
- Department of Horticulture, Zijingang Campus, Zhejiang University, Yuhangtang Road 866, Hangzhou, 310058, P. R. China.
- Key Laboratory of Horticultural Plants Growth, Development and Quality Improvement, Agricultural Ministry of China, Zijingang Road 866, Hangzhou, 310058, P. R. China.
| | - Meng-Meng Wang
- Department of Horticulture, Zijingang Campus, Zhejiang University, Yuhangtang Road 866, Hangzhou, 310058, P. R. China.
- Philips Research China, No. 9 Lane 888 Tian Lin Road, Shanghai, 200233, P. R. China.
| | - Yan-Ling Yin
- Department of Horticulture, Zijingang Campus, Zhejiang University, Yuhangtang Road 866, Hangzhou, 310058, P. R. China.
- Key Laboratory of Horticultural Plants Growth, Development and Quality Improvement, Agricultural Ministry of China, Zijingang Road 866, Hangzhou, 310058, P. R. China.
| | - Eugen Onac
- Philips Research Europe, High Tech Campus 34, 5656 AE, Eindhoven, Netherlands.
| | - Guo-Fu Zhou
- Philips Research Europe, High Tech Campus 34, 5656 AE, Eindhoven, Netherlands.
| | - Sheng Peng
- Philips Research China, No. 9 Lane 888 Tian Lin Road, Shanghai, 200233, P. R. China.
| | - Xiao-Jian Xia
- Department of Horticulture, Zijingang Campus, Zhejiang University, Yuhangtang Road 866, Hangzhou, 310058, P. R. China.
| | - Kai Shi
- Department of Horticulture, Zijingang Campus, Zhejiang University, Yuhangtang Road 866, Hangzhou, 310058, P. R. China.
| | - Jing-Quan Yu
- Department of Horticulture, Zijingang Campus, Zhejiang University, Yuhangtang Road 866, Hangzhou, 310058, P. R. China.
- Key Laboratory of Horticultural Plants Growth, Development and Quality Improvement, Agricultural Ministry of China, Zijingang Road 866, Hangzhou, 310058, P. R. China.
| | - Yan-Hong Zhou
- Department of Horticulture, Zijingang Campus, Zhejiang University, Yuhangtang Road 866, Hangzhou, 310058, P. R. China.
- Key Laboratory of Horticultural Plants Growth, Development and Quality Improvement, Agricultural Ministry of China, Zijingang Road 866, Hangzhou, 310058, P. R. China.
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139
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Liao Q, Yu Y, Cao Y, Lin B, Wei J. In situ
fluorescence labelling of jasmonic acid binding sites in plant tissues with cadmium‐free quantum dots. IET Nanobiotechnol 2015; 9:35-42. [DOI: 10.1049/iet-nbt.2014.0002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Affiliation(s)
- Qiumei Liao
- School of Chemistry and EnvironmentSouth China Normal UniversityGuangzhou 510006People's Republic of China
| | - Ying Yu
- School of Chemistry and EnvironmentSouth China Normal UniversityGuangzhou 510006People's Republic of China
| | - Yujuan Cao
- School of Chemistry and EnvironmentSouth China Normal UniversityGuangzhou 510006People's Republic of China
| | - Bixia Lin
- School of Chemistry and EnvironmentSouth China Normal UniversityGuangzhou 510006People's Republic of China
| | - Jingjing Wei
- School of Chemistry and EnvironmentSouth China Normal UniversityGuangzhou 510006People's Republic of China
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140
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Muñoz-Espinoza VA, López-Climent MF, Casaretto JA, Gómez-Cadenas A. Water Stress Responses of Tomato Mutants Impaired in Hormone Biosynthesis Reveal Abscisic Acid, Jasmonic Acid and Salicylic Acid Interactions. FRONTIERS IN PLANT SCIENCE 2015; 6:997. [PMID: 26635826 PMCID: PMC4649032 DOI: 10.3389/fpls.2015.00997] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2015] [Accepted: 10/30/2015] [Indexed: 05/02/2023]
Abstract
To investigate the putative crosstalk between JA and ABA in Solanum lycopersicum plants in response to drought, suppressor of prosystemin-mediated responses2 (spr2, JA-deficient) and flacca (flc, ABA-deficient) mutants together with the naphthalene/salicylate hydroxylase (NahG) transgenic (SA-deficient) line were used. Hormone profiling and gene expression of key enzymes in ABA, JA and SA biosynthesis were analyzed during early stages of drought. ABA accumulation was comparable in spr2 and wild type (WT) plants whereas expression of 9-cis-epoxycarotenoid dioxygenase 1 (NCED1) and NCED2 was different, implying a compensation mechanism between NCED genes and an organ-specific regulation of NCED1 expression. JA levels and 12-oxo-phytodienoic acid reductase 3 (OPR3) expression in flc plants suggest that ABA regulates the induction of the OPR3 gene in roots. By contrast, ABA treatment to flc plants leads to a reduction of JA and SA contents. Furthermore, different pattern of SA accumulation (and expression of isochorismate synthase and phenylalanine ammonia lyase 1) was observed between WT seedlings and mutants, suggesting that SA plays an important role on the early response of tomato plants to drought and also that JA and ABA modulate its biosynthesis. Finally, hormone profiling in spr2 and NahG plants indicate a crosstalk between JA and SA that could enhance tolerance of tomato to water stress.
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Affiliation(s)
| | - María F. López-Climent
- Departament de Ciències Agràries i del Medi Natural, Universitat Jaume ICastelló de la Plana, Spain
| | - José A. Casaretto
- Department of Molecular and Cellular Biology, University of GuelphGuelph, ON, Canada
| | - Aurelio Gómez-Cadenas
- Departament de Ciències Agràries i del Medi Natural, Universitat Jaume ICastelló de la Plana, Spain
- *Correspondence: Aurelio Gómez-Cadenas
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141
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Arabidopsis ERF109 mediates cross-talk between jasmonic acid and auxin biosynthesis during lateral root formation. Nat Commun 2014; 5:5833. [PMID: 25524530 DOI: 10.1038/ncomms6833] [Citation(s) in RCA: 179] [Impact Index Per Article: 17.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2014] [Accepted: 11/12/2014] [Indexed: 11/08/2022] Open
Abstract
Jasmonic acid (JA) is well known to promote lateral root formation but the mechanisms by which JA signalling is integrated into the pathways responsible for lateral root formation, and how it interacts with auxin in this process remains poorly understood. Here, we report that the highly JA-responsive ethylene response factor 109 (ERF109) mediates cross-talk between JA signalling and auxin biosynthesis to regulate lateral root formation in Arabidopsis. erf109 mutants have fewer lateral roots under MeJA treatments compared with wild type whereas ERF109 overexpression causes a root phenotype that resembles those of auxin overproduction mutants. ERF109 binds directly to GCC-boxes in the promoters of ASA1 and YUC2, which encode two key enzymes in auxin biosynthesis. Thus, our study reveals a molecular mechanism for JA and auxin cross-talk during JA-induced lateral root formation.
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142
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Ravensdale M, Rocheleau H, Wang L, Nasmith C, Ouellet T, Subramaniam R. Components of priming-induced resistance to Fusarium head blight in wheat revealed by two distinct mutants of Fusarium graminearum. MOLECULAR PLANT PATHOLOGY 2014; 15:948-56. [PMID: 24751103 PMCID: PMC6638912 DOI: 10.1111/mpp.12145] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Two mutants (tri6Δ and noxABΔ) of the fungal pathogen Fusarium graminearum were assessed for their ability to prime immune responses in wheat (cv. Roblin) against challenge with pathogenic F. graminearum. Priming treatments generated Fusarium head blight (FHB)-resistant wheat phenotypes and reduced the accumulation of fungal mycotoxins in infected tissues. Microarray analysis identified 260 transcripts that were differentially expressed during the priming period. Expression changes were observed in genes associated with immune surveillance systems, signalling cascades, antimicrobial compound production, oxidative burst, secondary metabolism, and detoxification and transport. Specifically, genes related to jasmonate, gibberellin and ethylene biosynthesis exhibited differential expression during priming. In addition, the induction of the phenylpropanoid pathways that lead to flavonoid, coumarin and hydroxycinnamic acid amide accumulation was also observed. This study highlights the utility of nonpathogenic mutants to both elicit and delineate stages of defence responses in wheat.
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Affiliation(s)
- Michael Ravensdale
- Eastern Cereal and Oilseed Research Centre, Agriculture and Agri-Food Canada, Ottawa, ON, Canada, K1A 0C6
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143
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144
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Taki-Nakano N, Ohzeki H, Kotera J, Ohta H. Cytoprotective effects of 12-oxo phytodienoic acid, a plant-derived oxylipin jasmonate, on oxidative stress-induced toxicity in human neuroblastoma SH-SY5Y cells. Biochim Biophys Acta Gen Subj 2014; 1840:3413-22. [PMID: 25219458 DOI: 10.1016/j.bbagen.2014.09.003] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2014] [Revised: 08/26/2014] [Accepted: 09/03/2014] [Indexed: 12/13/2022]
Abstract
BACKGROUND Jasmonates are plant lipid-derived oxylipins that act as key signaling compounds when plants are under oxidative stress, but little is known about their functions in mammalian cells. Here we investigated whether jasmonates could protect human neuroblastoma SH-SY5Y cells against oxidative stress-induced toxicity. METHODS The cells were pretreated with individual jasmonates for 24h and exposed to hydrogen peroxide (H2O2) for 24h. Before the resulting cytotoxicity, intracellular reactive oxygen species (ROS) levels, and mitochondrial membrane potential were measured. We also measured intracellular glutathione (GSH) levels and investigated changes in the signaling cascade mediated by nuclear factor erythroid 2-related factor 2 (Nrf2) in cells treated with 12-oxo phytodienoic acid (OPDA). RESULTS Among the jasmonates, only OPDA suppressed H2O2-induced cytotoxicity. OPDA pretreatment also inhibited the H2O2-induced ROS increase and mitochondrial membrane potential decrease. In addition, OPDA induced the nuclear translocation of Nrf2 and increased intracellular GSH level and the expression of the Nrf2-regulated phase II antioxidant enzymes heme oxygenase-1, NADPH quinone oxidoreductase 1, and glutathione reductase. Finally, the cytoprotective effects of OPDA were reduced by siRNA-induced knockdown of Nrf2. CONCLUSIONS These results demonstrated that among jasmonates, only OPDA suppressed oxidative stress-induced death of human neuroblastoma cells, which occurred via activation of the Nrf2 pathway. GENERAL SIGNIFICANCE Plant-derived oxylipin OPDA may have the potential to provide protection against oxidative stress-related diseases.
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Affiliation(s)
- Nozomi Taki-Nakano
- Department of Biological Sciences, Tokyo Institute of Technology, 4259-B-65 Nagatsuta-cho, Midori-ku, Yokohama 226-8501, Japan; Advanced Medical Research Laboratories, Mitsubishi Tanabe Pharma Corporation, 1000, Kamoshida-cho, Aoba-ku, Yokohama 227-0033, Japan.
| | - Hiromitsu Ohzeki
- Advanced Medical Research Laboratories, Mitsubishi Tanabe Pharma Corporation, 1000, Kamoshida-cho, Aoba-ku, Yokohama 227-0033, Japan
| | - Jun Kotera
- Advanced Medical Research Laboratories, Mitsubishi Tanabe Pharma Corporation, 1000, Kamoshida-cho, Aoba-ku, Yokohama 227-0033, Japan
| | - Hiroyuki Ohta
- Center for Biological Resources and Informatics, Tokyo Institute of Technology, 4259-B-65 Nagatsuta-cho, Midori-ku, Yokohama 226-8501, Japan; Earth-Life Science Institute, Ookayama, Meguro-ku, Tokyo 152-8551, Japan.
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145
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Hacham Y, Koussevitzky S, Kirma M, Amir R. Glutathione application affects the transcript profile of genes in Arabidopsis seedling. JOURNAL OF PLANT PHYSIOLOGY 2014; 171:1444-51. [PMID: 25077999 DOI: 10.1016/j.jplph.2014.06.016] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/01/2014] [Revised: 06/24/2014] [Accepted: 06/24/2014] [Indexed: 05/21/2023]
Abstract
Glutathione (GSH), a tripeptide thiol compound has multiple functions in plants. Recent works suggested that GSH plays a regulatory role in signaling in plants as part of their adaptation to stress. To better understand the role of GSH as a regulatory molecule, 14 days old Arabidopsis thaliana seedlings were treated with 5mM of GSH for 4h. Changes in gene expression patterns were studied by cDNA microarray analysis. The expression of 453 genes was significantly changed compared to the untreated control, of which 261 genes were up-regulated and 192 genes were down-regulated. Genes from several groups were affected, including those of sulfur metabolism, degradation and synthesis of macromolecules and transcription factors. Up-regulation of genes involved in responses to biotic stresses, or in jasmonate or salicylic acid synthesis and their signaling, suggests that GSH triggers genes that help protect the plants during stresses. In addition, GSH down regulated genes involved in plant growth and development, like those involved in cell wall synthesis and its extension, and genes associated with auxin and cytokinins response, which are related to growth and development of the plants. The results suggest that GSH might have a role in response to biotic stress by initiating defense responses and modifying plants' growth and development in an effort to tune their sessile lifestyle of plants to environmental constraints.
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Affiliation(s)
- Yael Hacham
- Laboratory of Plant Science, Migal Galilee Research Institute, P.O. Box 831, Kiryat Shmona 12100, Israel
| | - Shai Koussevitzky
- Laboratory of Plant Science, Migal Galilee Research Institute, P.O. Box 831, Kiryat Shmona 12100, Israel
| | - Menny Kirma
- Department of Plant Science, The Weizmann Institute of Science, Rehovot 76100, Israel
| | - Rachel Amir
- Laboratory of Plant Science, Migal Galilee Research Institute, P.O. Box 831, Kiryat Shmona 12100, Israel; Tel Hai College, Upper Galilee, Israel.
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146
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Correia B, Pintó-Marijuan M, Castro BB, Brossa R, López-Carbonell M, Pinto G. Hormonal dynamics during recovery from drought in two Eucalyptus globulus genotypes: from root to leaf. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2014; 82:151-60. [PMID: 24954071 DOI: 10.1016/j.plaphy.2014.05.016] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/24/2014] [Accepted: 05/31/2014] [Indexed: 05/05/2023]
Abstract
Drought is a limiting environmental stress that represents a growing constraint to the forestry sector. Eucalyptus globulus is a widely planted coppice species, which capacity to cope with water deficit has already been described. However, the capacity of this species to recover is still poorly understood. In this study, we aimed to investigate the changes in abscisic acid (ABA), ABA-glucose ester (ABA-GE) and jasmonic acid (JA) content in leaves, xylem sap and roots of two genotypes (AL-10 and AL-18) during rewatering (2 h, 4 h, 24 h, and 168 h), after a drought stress period (0 h). We wished to clarify the role of these hormones in the recovery from drought and to determine whether these hormonal relations were related to specific genotype metabolisms. Our results showed that drought caused an increased in ABA and ABA-GE levels in all analysed plant parts, while JA content decreased in leaves, increased in xylem sap and did not change in roots. Some of these responses were genotype specific. During rewatering, ABA and ABA-GE content decreased in both genotypes and all plant parts, but at different time scales, and JA levels did not greatly change. Again, the genotypes responded differently. Altogether, our results characterised the response pattern of clone AL-10 as more responsive and defended that leaf should be used in preliminary screening methods of stress tolerance. The hormonal dynamics were related to the previously documented responses of these genotypes and sustain further physiological and molecular studies of water stress in this and other tree species.
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Affiliation(s)
- Barbara Correia
- Department of Biology & CESAM - Centre for Environmental and Marine Studies, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
| | - Marta Pintó-Marijuan
- Molecular Ecophysiology Lab., ITQB (Instituto de Tecnologia Química e Biológica), 2780-901 Oeiras, Portugal; Departament de Biologia Vegetal, Facultat de Biologia, University of Barcelona, Avinguda Diagonal 643, 08028 Barcelona, Spain
| | - Bruno B Castro
- Department of Biology & CESAM - Centre for Environmental and Marine Studies, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
| | - Ricard Brossa
- Departament de Biologia Vegetal, Facultat de Biologia, University of Barcelona, Avinguda Diagonal 643, 08028 Barcelona, Spain
| | - Marta López-Carbonell
- Departament de Biologia Vegetal, Facultat de Biologia, University of Barcelona, Avinguda Diagonal 643, 08028 Barcelona, Spain
| | - Glória Pinto
- Department of Biology & CESAM - Centre for Environmental and Marine Studies, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal.
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147
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Peng H, Yang T, Jurick WM. Calmodulin Gene Expression in Response to Mechanical Wounding and Botrytis cinerea Infection in Tomato Fruit. PLANTS (BASEL, SWITZERLAND) 2014; 3:427-41. [PMID: 27135512 PMCID: PMC4844350 DOI: 10.3390/plants3030427] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/02/2014] [Revised: 08/11/2014] [Accepted: 08/20/2014] [Indexed: 01/10/2023]
Abstract
Calmodulin, a ubiquitous calcium sensor, plays an important role in decoding stress-triggered intracellular calcium changes and regulates the functions of numerous target proteins involved in various plant physiological responses. To determine the functions of calmodulin in fleshy fruit, expression studies were performed on a family of six calmodulin genes (SlCaMs) in mature-green stage tomato fruit in response to mechanical injury and Botrytis cinerea infection. Both wounding and pathogen inoculation triggered expression of all those genes, with SlCaM2 being the most responsive one to both treatments. Furthermore, all calmodulin genes were upregulated by salicylic acid and methyl jasmonate, two signaling molecules involved in plant immunity. In addition to SlCaM2, SlCaM1 was highly responsive to salicylic acid and methyl jasmonate. However, SlCaM2 exhibited a more rapid and stronger response than SlCaM1. Overexpression of SlCaM2 in tomato fruit enhanced resistance to Botrytis-induced decay, whereas reducing its expression resulted in increased lesion development. These results indicate that calmodulin is a positive regulator of plant defense in fruit by activating defense pathways including salicylate- and jasmonate-signaling pathways, and SlCaM2 is the major calmodulin gene responsible for this event.
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Affiliation(s)
- Hui Peng
- Food Quality Laboratory, Beltsville Agricultural Research Center, Agricultural Research Service, United States Department of Agriculture, Beltsville, MD 20705, USA; E-Mails: (H.P.); (W.M.J.)
- College of Life Sciences, Guangxi Normal University, Guilin 541004, China
| | - Tianbao Yang
- Food Quality Laboratory, Beltsville Agricultural Research Center, Agricultural Research Service, United States Department of Agriculture, Beltsville, MD 20705, USA; E-Mails: (H.P.); (W.M.J.)
| | - Wayne M. Jurick
- Food Quality Laboratory, Beltsville Agricultural Research Center, Agricultural Research Service, United States Department of Agriculture, Beltsville, MD 20705, USA; E-Mails: (H.P.); (W.M.J.)
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148
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Meesters C, Mönig T, Oeljeklaus J, Krahn D, Westfall CS, Hause B, Jez JM, Kaiser M, Kombrink E. A chemical inhibitor of jasmonate signaling targets JAR1 in Arabidopsis thaliana. Nat Chem Biol 2014; 10:830-6. [PMID: 25129030 DOI: 10.1038/nchembio.1591] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2013] [Accepted: 06/12/2014] [Indexed: 12/11/2022]
Abstract
Jasmonates are lipid-derived plant hormones that regulate plant defenses and numerous developmental processes. Although the biosynthesis and molecular function of the most active form of the hormone, (+)-7-iso-jasmonoyl-L-isoleucine (JA-Ile), have been unraveled, it remains poorly understood how the diversity of bioactive jasmonates regulates such a multitude of plant responses. Bioactive analogs have been used as chemical tools to interrogate the diverse and dynamic processes of jasmonate action. By contrast, small molecules impairing jasmonate functions are currently unknown. Here, we report on jarin-1 as what is to our knowledge the first small-molecule inhibitor of jasmonate responses that was identified in a chemical screen using Arabidopsis thaliana. Jarin-1 impairs the activity of JA-Ile synthetase, thereby preventing the synthesis of the active hormone, JA-Ile, whereas closely related enzymes are not affected. Thus, jarin-1 may serve as a useful chemical tool in search for missing regulatory components and further dissection of the complex jasmonate signaling networks.
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Affiliation(s)
- Christian Meesters
- 1] Chemical Biology Laboratory, Max Planck Institute for Plant Breeding Research, Köln, Germany. [2] Center for Medical Biotechnology, Department of Chemical Biology, Faculty of Biology, University Duisburg-Essen, Essen, Germany
| | - Timon Mönig
- Center for Medical Biotechnology, Department of Chemical Biology, Faculty of Biology, University Duisburg-Essen, Essen, Germany
| | - Julian Oeljeklaus
- Center for Medical Biotechnology, Department of Chemical Biology, Faculty of Biology, University Duisburg-Essen, Essen, Germany
| | - Daniel Krahn
- Center for Medical Biotechnology, Department of Chemical Biology, Faculty of Biology, University Duisburg-Essen, Essen, Germany
| | - Corey S Westfall
- Department of Biology, Washington University, St. Louis, Missouri, USA
| | - Bettina Hause
- Department of Cell and Metabolic Biology, Leibniz Institute of Plant Biochemistry, Halle (Saale), Germany
| | - Joseph M Jez
- Department of Biology, Washington University, St. Louis, Missouri, USA
| | - Markus Kaiser
- Center for Medical Biotechnology, Department of Chemical Biology, Faculty of Biology, University Duisburg-Essen, Essen, Germany
| | - Erich Kombrink
- Chemical Biology Laboratory, Max Planck Institute for Plant Breeding Research, Köln, Germany
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149
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Sun H, Wang L, Zhang B, Ma J, Hettenhausen C, Cao G, Sun G, Wu J, Wu J. Scopoletin is a phytoalexin against Alternaria alternata in wild tobacco dependent on jasmonate signalling. JOURNAL OF EXPERIMENTAL BOTANY 2014; 65:4305-15. [PMID: 24821958 PMCID: PMC4112635 DOI: 10.1093/jxb/eru203] [Citation(s) in RCA: 72] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Alternaria alternata (tobacco pathotype) is a necrotrophic fungus causing severe losses in Nicotiana species by infection of mature leaves. Similar to what has been observed in cultivated tobacco, N. tabacum, young leaves of wild tobacco, N. attenuata, were more resistant to A. alternata than mature leaves, and this was correlated with stronger blue fluorescence induced after infection. However, the nature of the fluorescence-emitting compound, its role in defence, and its regulation were not clear. Silencing feruloyl-CoA 6'-hydroxylase 1 (F6'H1), the gene encoding the key enzyme for scopoletin biosynthesis, by virus-induced gene silencing (VIGS) revealed that the blue fluorescence was mainly emitted by scopoletin and its β-glycoside form, scopolin. Further analysis showed that scopoletin exhibited strong antifungal activity against A. alternata in vitro and in vivo. Importantly, jasmonic acid (JA) levels were highly elicited in young leaves but much less in mature leaves after infection; and fungus-elicited scopoletin was absent in JA-deficient plants, but was largely restored with methyl jasmonate treatments. Consistent with this, plants strongly impaired in JA biosynthesis and perception were highly susceptible to A. alternata in the same way scopoletin/scopolin-depleted VIGS F6'H1 plants. Furthermore, silencing MYC2, a master regulator of most JA responses, reduced A. alternata-induced NaF6'H1 transcripts and scopoletin. Thus, it is concluded that JA signalling is activated in N. attenuata leaves after infection, which subsequently regulates scopoletin biosynthesis for the defence against A. alternata partly through MYC2, and higher levels of scopoletin accumulated in young leaves account for their strong resistance.
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Affiliation(s)
- Huanhuan Sun
- Key Laboratory of Economic Plants and Biotechnology, Kunming Institute of Botany, Chinese Academy of Sciences, Lanhei Road 132, 650201, Kunming, China
| | - Lei Wang
- Key Laboratory of Economic Plants and Biotechnology, Kunming Institute of Botany, Chinese Academy of Sciences, Lanhei Road 132, 650201, Kunming, China
| | - Baoqin Zhang
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, China
| | - Junhong Ma
- Yunnan Academy of Tobacco Agricultural Science, Yuantong Street 33, 650031, Kunming, China
| | - Christian Hettenhausen
- Key Laboratory of Economic Plants and Biotechnology, Kunming Institute of Botany, Chinese Academy of Sciences, Lanhei Road 132, 650201, Kunming, China
| | - Guoyan Cao
- Key Laboratory of Economic Plants and Biotechnology, Kunming Institute of Botany, Chinese Academy of Sciences, Lanhei Road 132, 650201, Kunming, China
| | - Guiling Sun
- Key Laboratory of Economic Plants and Biotechnology, Kunming Institute of Botany, Chinese Academy of Sciences, Lanhei Road 132, 650201, Kunming, China
| | - Jianqiang Wu
- Key Laboratory of Economic Plants and Biotechnology, Kunming Institute of Botany, Chinese Academy of Sciences, Lanhei Road 132, 650201, Kunming, China
| | - Jinsong Wu
- Key Laboratory of Economic Plants and Biotechnology, Kunming Institute of Botany, Chinese Academy of Sciences, Lanhei Road 132, 650201, Kunming, China
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150
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Differential gene expression and metabolomic analyses of Brachypodium distachyon infected by deoxynivalenol producing and non-producing strains of Fusarium graminearum. BMC Genomics 2014; 15:629. [PMID: 25063396 PMCID: PMC4124148 DOI: 10.1186/1471-2164-15-629] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2014] [Accepted: 06/18/2014] [Indexed: 01/20/2023] Open
Abstract
BACKGROUND Fusarium Head Blight (FHB) caused primarily by Fusarium graminearum (Fg) is one of the major diseases of small-grain cereals including bread wheat. This disease both reduces yields and causes quality losses due to the production of deoxynivalenol (DON), the major type B trichothecene mycotoxin. DON has been described as a virulence factor enabling efficient colonization of spikes by the fungus in wheat, but its precise role during the infection process is still elusive. Brachypodium distachyon (Bd) is a model cereal species which has been shown to be susceptible to FHB. Here, a functional genomics approach was performed in order to characterize the responses of Bd to Fg infection using a global transcriptional and metabolomic profiling of B. distachyon plants infected by two strains of F. graminearum: a wild-type strain producing DON (Fgdon+) and a mutant strain impaired in the production of the mycotoxin (Fgdon-). RESULTS Histological analysis of the interaction of the Bd21 ecotype with both Fg strains showed extensive fungal tissue colonization with the Fgdon+ strain while the florets infected with the Fgdon- strain exhibited a reduced hyphal extension and cell death on palea and lemma tissues. Fungal biomass was reduced in spikes inoculated with the Fgdon- strain as compared with the wild-type strain. The transcriptional analysis showed that jasmonate and ethylene-signalling pathways are induced upon infection, together with genes encoding putative detoxification and transport proteins, antioxidant functions as well as secondary metabolite pathways. In particular, our metabolite profiling analysis showed that tryptophan-derived metabolites, tryptamine, serotonin, coumaroyl-serotonin and feruloyl-serotonin, are more induced upon infection by the Fgdon+ strain than by the Fgdon- strain. Serotonin was shown to exhibit a slight direct antimicrobial effect against Fg. CONCLUSION Our results show that Bd exhibits defense hallmarks similar to those already identified in cereal crops. While the fungus uses DON as a virulence factor, the host plant preferentially induces detoxification and the phenylpropanoid and phenolamide pathways as resistance mechanisms. Together with its amenability in laboratory conditions, this makes Bd a very good model to study cereal resistance mechanisms towards the major disease FHB.
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