51
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Findling S, Stotz HU, Zoeller M, Krischke M, Zander M, Gatz C, Berger S, Mueller MJ. TGA2 signaling in response to reactive electrophile species is not dependent on cysteine modification of TGA2. PLoS One 2018; 13:e0195398. [PMID: 29608605 PMCID: PMC5880405 DOI: 10.1371/journal.pone.0195398] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2017] [Accepted: 03/21/2018] [Indexed: 01/18/2023] Open
Abstract
Reactive electrophile species (RES), including prostaglandins, phytoprostanes and 12-oxo phytodienoic acid (OPDA), activate detoxification responses in plants and animals. However, the pathways leading to the activation of defense reactions related to abiotic or biotic stress as a function of RES formation, accumulation or treatment are poorly understood in plants. Here, the thiol-modification of proteins, including the RES-activated basic region/leucine zipper transcription factor TGA2, was studied. TGA2 contains a single cysteine residue (Cys186) that was covalently modified by reactive cyclopentenones but not required for induction of detoxification genes in response to OPDA or prostaglandin A1. Activation of the glutathione-S-transferase 6 (GST6) promoter was responsive to cyclopentenones but not to unreactive cyclopentanones, including jasmonic acid suggesting that thiol reactivity of RES is important to activate the TGA2-dependent signaling pathway resulting in GST6 activation We show that RES modify thiols in numerous proteins in vivo, however, thiol reactivity alone appears not to be sufficient for biological activity as demonstrated by the failure of several membrane permeable thiol reactive reagents to activate the GST6 promoter.
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Affiliation(s)
- Simone Findling
- Julius-von-Sachs-Institute of Biosciences, Biocenter, Pharmaceutical Biology, University of Wuerzburg, Wuerzburg, Germany
| | - Henrik U. Stotz
- Julius-von-Sachs-Institute of Biosciences, Biocenter, Pharmaceutical Biology, University of Wuerzburg, Wuerzburg, Germany
| | - Maria Zoeller
- Julius-von-Sachs-Institute of Biosciences, Biocenter, Pharmaceutical Biology, University of Wuerzburg, Wuerzburg, Germany
| | - Markus Krischke
- Julius-von-Sachs-Institute of Biosciences, Biocenter, Pharmaceutical Biology, University of Wuerzburg, Wuerzburg, Germany
| | - Mark Zander
- Albrecht-von-Haller Institute for Plant Sciences, Georg-August-University of Goettingen, Goettingen, Germany
| | - Christiane Gatz
- Albrecht-von-Haller Institute for Plant Sciences, Georg-August-University of Goettingen, Goettingen, Germany
| | - Susanne Berger
- Julius-von-Sachs-Institute of Biosciences, Biocenter, Pharmaceutical Biology, University of Wuerzburg, Wuerzburg, Germany
| | - Martin J. Mueller
- Julius-von-Sachs-Institute of Biosciences, Biocenter, Pharmaceutical Biology, University of Wuerzburg, Wuerzburg, Germany
- * E-mail:
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Liu X, Li X, Dai C, Zhou J, Yan T, Zhang J. Improved short-term drought response of transgenic rice over-expressing maize C 4 phosphoenolpyruvate carboxylase via calcium signal cascade. JOURNAL OF PLANT PHYSIOLOGY 2017; 218:206-221. [PMID: 28888162 DOI: 10.1016/j.jplph.2017.08.005] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2017] [Revised: 08/22/2017] [Accepted: 08/22/2017] [Indexed: 06/07/2023]
Abstract
To understand the link between long-term drought tolerance and short-term drought responses in plants, transgenic rice (Oryza sativa L.) plants over-expressing the maize C4-pepc gene encoding phosphoenolpyruvate carboxylase (PC) and wild-type (WT) rice plants were subjected to PEG 6000 treatments to simulate drought stress. Compared with WT, PC had the higher survival rate and net photosynthetic rate after 16days of drought treatment, and had higher relative water content in leaves after 2h of drought treatment as well, conferring drought tolerance. WT accumulated higher amounts of malondialdehyde, superoxide radicals, and H2O2 than PC under the 2-h PEG 6000 treatment, indicating greater damages in WT. Results from pretreatments with a Ca2+ chelator and/or antagonist showed that the regulation of the early drought response in PC was Ca2+-dependent. The NO and H2O2 levels in PC lines were also up-regulated via Ca2+ signals, indicating that Ca2+ in PC lines also reacted upstream of NO and H2O2. 2-h drought treatment increased the transcripts of CPK9 and CPK4 in PC via positive up-regulation of Ca2+. The transcripts of NAC6 [NACs (NAM, ATAF1, ATAF2, and CUC2)] and bZIP60 (basic leucine zipper, bZIP) were up-regulated, but those of DREB2B (dehydration-responsive element-binding protein, DREB) were down-regulated, both via Ca2+ signals in PC. PEPC activity, expressions of C4-pepc, and the antioxidant enzyme activities in PC lines were up-regulated via Ca2+. These results indicated that Ca2+ signals in PC lines can up-regulate the NAC6 and bZIP60 and the downstream targets for early drought responses, conferring drought tolerance for the long term.
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Affiliation(s)
- Xiaolong Liu
- Institute of Food Crops, Provincial Key Laboratory of Agrobiology, Jiangsu Academy of Agricultural Sciences, Jiangsu High Quality Rice R and D Center, Nanjing Branch, China National Center for Rice Improvement, Nanjing 210014, PR China; College of Life Science, Nanjing Agricultural University, Nanjing 210095, PR China
| | - Xia Li
- Institute of Food Crops, Provincial Key Laboratory of Agrobiology, Jiangsu Academy of Agricultural Sciences, Jiangsu High Quality Rice R and D Center, Nanjing Branch, China National Center for Rice Improvement, Nanjing 210014, PR China; College of Life Science, Nanjing Agricultural University, Nanjing 210095, PR China.
| | - Chuanchao Dai
- Jiangsu Key Laboratory for Microbes and Functional Genomics, Jiangsu Engineering and Technology Research Center for Industrialization of Microbial Resources, College of Life Sciences, Nanjing Normal University, Nanjing 210023, PR China
| | - Jiayu Zhou
- Jiangsu Key Laboratory for Microbes and Functional Genomics, Jiangsu Engineering and Technology Research Center for Industrialization of Microbial Resources, College of Life Sciences, Nanjing Normal University, Nanjing 210023, PR China
| | - Ting Yan
- Institute of Food Crops, Provincial Key Laboratory of Agrobiology, Jiangsu Academy of Agricultural Sciences, Jiangsu High Quality Rice R and D Center, Nanjing Branch, China National Center for Rice Improvement, Nanjing 210014, PR China; College of Life Science, Nanjing Agricultural University, Nanjing 210095, PR China
| | - Jinfei Zhang
- Institute of Food Crops, Provincial Key Laboratory of Agrobiology, Jiangsu Academy of Agricultural Sciences, Jiangsu High Quality Rice R and D Center, Nanjing Branch, China National Center for Rice Improvement, Nanjing 210014, PR China
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Noman A, Liu Z, Aqeel M, Zainab M, Khan MI, Hussain A, Ashraf MF, Li X, Weng Y, He S. Basic leucine zipper domain transcription factors: the vanguards in plant immunity. Biotechnol Lett 2017; 39:1779-1791. [DOI: 10.1007/s10529-017-2431-1] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2017] [Accepted: 08/31/2017] [Indexed: 01/05/2023]
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Genome-Wide Identification of bZIP Family Genes Involved in Drought and Heat Stresses in Strawberry ( Fragaria vesca). Int J Genomics 2017; 2017:3981031. [PMID: 28487861 PMCID: PMC5405593 DOI: 10.1155/2017/3981031] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2016] [Revised: 01/24/2017] [Accepted: 02/12/2017] [Indexed: 12/20/2022] Open
Abstract
Basic leucine zipper (bZIP) genes are known to play a crucial role in response to various processes in plant as well as abiotic or biotic stress challenges. We have performed an identification and characterization of 50 bZIP genes across the woodland strawberry (Fragaria vesca) genome, which were divided into 10 clades according to the phylogenetic relationship of the strawberry bZIP proteins with those in Arabidopsis and rice. Five categories of intron patterns were observed within basic and hinge regions of the bZIP domains. Some additional conserved motifs have been found with the group specificity. Further, we predicted DNA-binding specificity of the basic and hinge regions as well as dimerization properties of leucine zipper regions, which was consistent with our phylogenetic clade and classified into 20 subfamilies. Across the different developmental stages of 15 organs and two types of fruits, the clade A bZIP members showed different tissue-specific expression patterns and the duplicated genes were differentially regulated, indicating a functional diversification coupled with the expansion of this gene family in strawberry. Under normal growth conditions, mrna11837 and mrna30280 of clade A showed very weak expression levels in organs and fruits, respectively; but higher expression was observed with different set of genes following drought and heat treatment, which may be caused by the separate response pathway between drought and heat treatments.
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Liu H, Dong S, Sun D, Liu W, Gu F, Liu Y, Guo T, Wang H, Wang J, Chen Z. CONSTANS-Like 9 (OsCOL9) Interacts with Receptor for Activated C-Kinase 1(OsRACK1) to Regulate Blast Resistance through Salicylic Acid and Ethylene Signaling Pathways. PLoS One 2016; 11:e0166249. [PMID: 27829023 PMCID: PMC5102437 DOI: 10.1371/journal.pone.0166249] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2016] [Accepted: 10/25/2016] [Indexed: 11/19/2022] Open
Abstract
In a previous transcriptome analysis of early response genes in rice during Magnaporthe oryzae infection, we identified a CONSTANS-like (COL) gene OsCOL9. In the present study, we investigated the functional roles of OsCOL9 in blast resistance. OsCOL9 belonged to group II of the COL protein family, and it contained a BB-box and a C-terminal CCT (CONSTANS, COL and TOC1) domain. OsCOL9 was found in the nucleus of rice cells, and it exerted transcriptional activation activities through its middle region (MR). Magnaporthe oryzae infection induced OsCOL9 expression, and transgenic OsCOL9 knock-out rice plants showed increased pathogen susceptibility. OsCOL9 was a critical regulator of pathogen-related genes, especially PR1b, which were also activated by exogenous salicylic acid (SA) and 1-aminocyclopropane-1-carboxylicacid (ACC), the precursor of ethylene (ET). Further analysis indicated that OsCOL9 over-expression increased the expressions of phytohormone biosynthetic genes, NPR1, WRKY45, OsACO1 and OsACS1, which were related to SA and ET biosynthesis. Interestingly, we found that OsCOL9 physically interacted with the scaffold protein OsRACK1 through its CCT domain, and the OsRACK1 expression was induced in response to exogenous SA and ACC as well as M. oryzae infection. Taken together, these results indicated that the COL protein OsCOL9 interacted with OsRACK1, and it enhanced the rice blast resistance through SA and ET signaling pathways.
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Affiliation(s)
- Hao Liu
- National Engineering Research Center of Plant Space Breeding, South China Agricultural University, Guangzhou, 510642, China
| | - Shuangyu Dong
- National Engineering Research Center of Plant Space Breeding, South China Agricultural University, Guangzhou, 510642, China
| | - Dayuan Sun
- Plant Protection Research Institute Guangdong Academy of Agricultural Sciences/Guangdong Provincial Key Laboratory of High Technology for Plant Protection, Guangzhou, 510640, China
| | - Wei Liu
- National Engineering Research Center of Plant Space Breeding, South China Agricultural University, Guangzhou, 510642, China
| | - Fengwei Gu
- National Engineering Research Center of Plant Space Breeding, South China Agricultural University, Guangzhou, 510642, China
| | - Yongzhu Liu
- National Engineering Research Center of Plant Space Breeding, South China Agricultural University, Guangzhou, 510642, China
| | - Tao Guo
- National Engineering Research Center of Plant Space Breeding, South China Agricultural University, Guangzhou, 510642, China
| | - Hui Wang
- National Engineering Research Center of Plant Space Breeding, South China Agricultural University, Guangzhou, 510642, China
| | - Jiafeng Wang
- National Engineering Research Center of Plant Space Breeding, South China Agricultural University, Guangzhou, 510642, China
- * E-mail: (JW); (ZC)
| | - Zhiqiang Chen
- National Engineering Research Center of Plant Space Breeding, South China Agricultural University, Guangzhou, 510642, China
- * E-mail: (JW); (ZC)
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Malacarne G, Coller E, Czemmel S, Vrhovsek U, Engelen K, Goremykin V, Bogs J, Moser C. The grapevine VvibZIPC22 transcription factor is involved in the regulation of flavonoid biosynthesis. JOURNAL OF EXPERIMENTAL BOTANY 2016; 67:3509-22. [PMID: 27194742 PMCID: PMC4892739 DOI: 10.1093/jxb/erw181] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
In grapevine, flavonoids constitute one of the most abundant subgroups of secondary metabolites, influencing the quality, health value, and typicity of wines. Their synthesis in many plant species is mainly regulated at the transcriptional level by modulation of flavonoid pathway genes either by single regulators or by complexes of different regulators. In particular, bZIP and MYB factors interact synergistically in the recognition of light response units present in the promoter of some genes of the pathway, thus mediating light-dependent flavonoid biosynthesis. We recently identified VvibZIPC22, a member of clade C of the grapevine bZIP family, in a quantitative trait locus (QTL) specifically associated with kaemperol content in mature berries. Here, to validate the involvement of this candidate gene in the fine regulation of flavonol biosynthesis, we characterized its function by in vitro and in vivo experiments. A role for this gene in the control of flavonol biosynthesis was indeed confirmed by its highest expression at flowering and during UV light-mediated induction, paralleled by accumulation of the flavonol synthase 1 transcript and flavonol compounds. The overexpression of VvibZIPC22 in tobacco caused a significant increase in several flavonoids in the flower, via induction of general and specific genes of the pathway. In agreement with this evidence, VvibZIPC22 was able to activate the promoters of specific genes of the flavonoid pathway, alone or together with other factors, as revealed by transient reporter assays. These findings, supported by in silico indications, allowed us to propose VvibZIPC22 as a new regulator of flavonoid biosynthesis in grapevine.
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Affiliation(s)
- Giulia Malacarne
- Research and Innovation Centre, Fondazione Edmund Mach, Via E. Mach 1, 38010 S. Michele all'Adige, Trento, Italy
| | - Emanuela Coller
- Research and Innovation Centre, Fondazione Edmund Mach, Via E. Mach 1, 38010 S. Michele all'Adige, Trento, Italy
| | - Stefan Czemmel
- Centre for Organismal Studies Heidelberg, University of Heidelberg, Im Neuenheimer Feld 360, D-69120 Heidelberg, Germany
| | - Urska Vrhovsek
- Research and Innovation Centre, Fondazione Edmund Mach, Via E. Mach 1, 38010 S. Michele all'Adige, Trento, Italy
| | - Kristof Engelen
- Research and Innovation Centre, Fondazione Edmund Mach, Via E. Mach 1, 38010 S. Michele all'Adige, Trento, Italy
| | - Vadim Goremykin
- Research and Innovation Centre, Fondazione Edmund Mach, Via E. Mach 1, 38010 S. Michele all'Adige, Trento, Italy
| | - Jochen Bogs
- Centre for Organismal Studies Heidelberg, University of Heidelberg, Im Neuenheimer Feld 360, D-69120 Heidelberg, Germany Studiengang Weinbau und Oenologie, Dienstleistungszentrum Laendlicher Raum Rheinpfalz, Breitenweg 71, D-67435 Neustadt, Germany
| | - Claudio Moser
- Research and Innovation Centre, Fondazione Edmund Mach, Via E. Mach 1, 38010 S. Michele all'Adige, Trento, Italy
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Chandra S, Singh D, Pathak J, Kumari S, Kumar M, Poddar R, Balyan HS, Gupta PK, Prabhu KV, Mukhopadhyay K. De Novo Assembled Wheat Transcriptomes Delineate Differentially Expressed Host Genes in Response to Leaf Rust Infection. PLoS One 2016; 11:e0148453. [PMID: 26840746 PMCID: PMC4739524 DOI: 10.1371/journal.pone.0148453] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2015] [Accepted: 01/17/2016] [Indexed: 11/20/2022] Open
Abstract
Pathogens like Puccinia triticina, the causal organism for leaf rust, extensively damages wheat production. The interaction at molecular level between wheat and the pathogen is complex and less explored. The pathogen induced response was characterized using mock- or pathogen inoculated near-isogenic wheat lines (with or without seedling leaf rust resistance gene Lr28). Four Serial Analysis of Gene Expression libraries were prepared from mock- and pathogen inoculated plants and were subjected to Sequencing by Oligonucleotide Ligation and Detection, which generated a total of 165,767,777 reads, each 35 bases long. The reads were processed and multiple k-mers were attempted for de novo transcript assembly; 22 k-mers showed the best results. Altogether 21,345 contigs were generated and functionally characterized by gene ontology annotation, mining for transcription factors and resistance genes. Expression analysis among the four libraries showed extensive alterations in the transcriptome in response to pathogen infection, reflecting reorganizations in major biological processes and metabolic pathways. Role of auxin in determining pathogenesis in susceptible and resistant lines were imperative. The qPCR expression study of four LRR-RLK (Leucine-rich repeat receptor-like protein kinases) genes showed higher expression at 24 hrs after inoculation with pathogen. In summary, the conceptual model of induced resistance in wheat contributes insights on defense responses and imparts knowledge of Puccinia triticina-induced defense transcripts in wheat plants.
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Affiliation(s)
- Saket Chandra
- Department of Bio-Engineering, Birla Institute of Technology, Mesra, Ranchi 835215 Jharkhand, India
| | - Dharmendra Singh
- Department of Bio-Engineering, Birla Institute of Technology, Mesra, Ranchi 835215 Jharkhand, India
| | - Jyoti Pathak
- Department of Bio-Engineering, Birla Institute of Technology, Mesra, Ranchi 835215 Jharkhand, India
| | - Supriya Kumari
- Department of Genetics and Plant Breeding, Ch. Charan Singh University, Meerut 200005, Uttar Pradesh, India
| | - Manish Kumar
- Department of Bio-Engineering, Birla Institute of Technology, Mesra, Ranchi 835215 Jharkhand, India
| | - Raju Poddar
- Department of Bio-Engineering, Birla Institute of Technology, Mesra, Ranchi 835215 Jharkhand, India
| | - Harindra Singh Balyan
- Department of Genetics and Plant Breeding, Ch. Charan Singh University, Meerut 200005, Uttar Pradesh, India
| | - Puspendra Kumar Gupta
- Department of Genetics and Plant Breeding, Ch. Charan Singh University, Meerut 200005, Uttar Pradesh, India
| | - Kumble Vinod Prabhu
- Division of Genetics, Indian Agricultural Research Institute, New Delhi 110012, India
| | - Kunal Mukhopadhyay
- Department of Bio-Engineering, Birla Institute of Technology, Mesra, Ranchi 835215 Jharkhand, India
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Zhang X, Dong J, Liu H, Wang J, Qi Y, Liang Z. Transcriptome Sequencing in Response to Salicylic Acid in Salvia miltiorrhiza. PLoS One 2016; 11:e0147849. [PMID: 26808150 PMCID: PMC4726470 DOI: 10.1371/journal.pone.0147849] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2015] [Accepted: 01/08/2016] [Indexed: 12/30/2022] Open
Abstract
Salvia miltiorrhiza is a traditional Chinese herbal medicine, whose quality and yield are often affected by diseases and environmental stresses during its growing season. Salicylic acid (SA) plays a significant role in plants responding to biotic and abiotic stresses, but the involved regulatory factors and their signaling mechanisms are largely unknown. In order to identify the genes involved in SA signaling, the RNA sequencing (RNA-seq) strategy was employed to evaluate the transcriptional profiles in S. miltiorrhiza cell cultures. A total of 50,778 unigenes were assembled, in which 5,316 unigenes were differentially expressed among 0-, 2-, and 8-h SA induction. The up-regulated genes were mainly involved in stimulus response and multi-organism process. A core set of candidate novel genes coding SA signaling component proteins was identified. Many transcription factors (e.g., WRKY, bHLH and GRAS) and genes involved in hormone signal transduction were differentially expressed in response to SA induction. Detailed analysis revealed that genes associated with defense signaling, such as antioxidant system genes, cytochrome P450s and ATP-binding cassette transporters, were significantly overexpressed, which can be used as genetic tools to investigate disease resistance. Our transcriptome analysis will help understand SA signaling and its mechanism of defense systems in S. miltiorrhiza.
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Affiliation(s)
- Xiaoru Zhang
- College of Life Sciences, Northwest Agriculture & Forestry University, Yangling, Shaanxi, People's Republic of China
| | - Juane Dong
- College of Life Sciences, Northwest Agriculture & Forestry University, Yangling, Shaanxi, People's Republic of China
- * E-mail: (JD); (ZL)
| | - Hailong Liu
- College of Life Sciences, Northwest Agriculture & Forestry University, Yangling, Shaanxi, People's Republic of China
| | - Jiao Wang
- College of Life Sciences, Northwest Agriculture & Forestry University, Yangling, Shaanxi, People's Republic of China
| | - Yuexin Qi
- College of Life Sciences, Northwest Agriculture & Forestry University, Yangling, Shaanxi, People's Republic of China
| | - Zongsuo Liang
- College of Life Sciences, Zhejiang Sci-Tech University, Hangzhou, Zhejiang, People's Republic of China
- * E-mail: (JD); (ZL)
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Mohanty B, Kitazumi A, Cheung CYM, Lakshmanan M, de Los Reyes BG, Jang IC, Lee DY. Identification of candidate network hubs involved in metabolic adjustments of rice under drought stress by integrating transcriptome data and genome-scale metabolic network. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2016; 242:224-239. [PMID: 26566840 DOI: 10.1016/j.plantsci.2015.09.018] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2015] [Revised: 09/11/2015] [Accepted: 09/22/2015] [Indexed: 05/08/2023]
Abstract
In this study, we have integrated a rice genome-scale metabolic network and the transcriptome of a drought-tolerant rice line, DK151, to identify the major transcriptional regulators involved in metabolic adjustments necessary for adaptation to drought. This was achieved by examining the differential expressions of transcription factors and metabolic genes in leaf, root and young panicle of rice plants subjected to drought stress during tillering, booting and panicle elongation stages. Critical transcription factors such as AP2/ERF, bZIP, MYB and NAC that control the important nodes in the gene regulatory pathway were identified through correlative analysis of the patterns of spatio-temporal expression and cis-element enrichment. We showed that many of the candidate transcription factors involved in metabolic adjustments were previously linked to phenotypic variation for drought tolerance. This approach represents the first attempt to integrate models of transcriptional regulation and metabolic pathways for the identification of candidate regulatory genes for targeted selection in rice breeding.
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Affiliation(s)
- Bijayalaxmi Mohanty
- Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, 117585 Singapore
| | - Ai Kitazumi
- School of Biology and Ecology, University of Maine, Orono, ME 04469 USA
| | - C Y Maurice Cheung
- Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, 117585 Singapore
| | - Meiyappan Lakshmanan
- Bioprocessing Technology Institute, Agency for Science, Technology and Research (A*STAR), 20 Biopolis Way, #06-01, Centros, 138668 Singapore
| | | | - In-Cheol Jang
- Temasek Life Sciences Laboratory, 1 Research Link, National University of Singapore, 117604 Singapore; Department of Biological Sciences, National University of Singapore,14 Science Drive 4, 117543 Singapore
| | - Dong-Yup Lee
- Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, 117585 Singapore; Bioprocessing Technology Institute, Agency for Science, Technology and Research (A*STAR), 20 Biopolis Way, #06-01, Centros, 138668 Singapore.
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60
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Zhao J, Guo R, Guo C, Hou H, Wang X, Gao H. Evolutionary and Expression Analyses of the Apple Basic Leucine Zipper Transcription Factor Family. FRONTIERS IN PLANT SCIENCE 2016; 7:376. [PMID: 27066030 PMCID: PMC4811886 DOI: 10.3389/fpls.2016.00376] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2015] [Accepted: 03/11/2016] [Indexed: 05/03/2023]
Abstract
Transcription factors (TFs) play essential roles in the regulatory networks controlling many developmental processes in plants. Members of the basic leucine (Leu) zipper (bZIP) TF family, which is unique to eukaryotes, are involved in regulating diverse processes, including flower and vascular development, seed maturation, stress signaling, and defense responses to pathogens. The bZIP proteins have a characteristic bZIP domain composed of a DNA-binding basic region and a Leu zipper dimerization region. In this study, we identified 112 apple (Malus domestica Borkh) bZIP TF-encoding genes, termed MdbZIP genes. Synteny analysis indicated that segmental and tandem duplication events, as well as whole genome duplication, have contributed to the expansion of the apple bZIP family. The family could be divided into 11 groups based on structural features of the encoded proteins, as well as on the phylogenetic relationship of the apple bZIP proteins to those of the model plant Arabidopsis thaliana (AtbZIP genes). Synteny analysis revealed that several paired MdbZIP genes and AtbZIP gene homologs were located in syntenic genomic regions. Furthermore, expression analyses of group A MdbZIP genes showed distinct expression levels in 10 different organs. Moreover, changes in these expression profiles in response to abiotic stress conditions and various hormone treatments identified MdbZIP genes that were responsive to high salinity and drought, as well as to different phytohormones.
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Affiliation(s)
- Jiao Zhao
- State Key Laboratory of Crop Stress Biology in Arid Areas, College of Horticulture, Northwest A&F UniversityYangling, China
- Key Laboratory of Horticultural Plant Biology and Germplasm Innovation in Northwest China, Ministry of Agriculture, Northwest A&F UniversityYangling, China
| | - Rongrong Guo
- State Key Laboratory of Crop Stress Biology in Arid Areas, College of Horticulture, Northwest A&F UniversityYangling, China
| | - Chunlei Guo
- State Key Laboratory of Crop Stress Biology in Arid Areas, College of Horticulture, Northwest A&F UniversityYangling, China
- Key Laboratory of Horticultural Plant Biology and Germplasm Innovation in Northwest China, Ministry of Agriculture, Northwest A&F UniversityYangling, China
| | - Hongmin Hou
- College of Horticulture, Qingdao Agricultural UniversityQingdao, China
| | - Xiping Wang
- State Key Laboratory of Crop Stress Biology in Arid Areas, College of Horticulture, Northwest A&F UniversityYangling, China
- Key Laboratory of Horticultural Plant Biology and Germplasm Innovation in Northwest China, Ministry of Agriculture, Northwest A&F UniversityYangling, China
- *Correspondence: Xiping Wang
| | - Hua Gao
- State Key Laboratory of Crop Stress Biology in Arid Areas, College of Horticulture, Northwest A&F UniversityYangling, China
- Key Laboratory of Horticultural Plant Biology and Germplasm Innovation in Northwest China, Ministry of Agriculture, Northwest A&F UniversityYangling, China
- Hua Gao
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Moon SJ, Han SY, Kim DY, Yoon IS, Shin D, Byun MO, Kwon HB, Kim BG. Ectopic expression of a hot pepper bZIP-like transcription factor in potato enhances drought tolerance without decreasing tuber yield. PLANT MOLECULAR BIOLOGY 2015; 89:421-31. [PMID: 26394867 DOI: 10.1007/s11103-015-0378-y] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/09/2015] [Accepted: 09/10/2015] [Indexed: 05/23/2023]
Abstract
Over-expression of group A bZIP transcription factor genes in plants improves abiotic stress tolerance but usually reduces yields. Thus, there have been several efforts to overcome yield penalty in transgenic plants. In this study, we characterized that expression of the hot pepper (Capsicum annuum) gene CaBZ1, which encodes a group S bZIP transcription factor, was induced by salt and osmotic stress as well as abscisic acid (ABA). Transgenic potato (Solanum tuberosum) plants over-expressing CaBZ1 exhibited reduced rates of water loss and faster stomatal closure than non transgenic potato plants under drought and ABA treatment conditions. CaBZ1 over-expression in transgenic potato increased the expression of ABA- and stress-related genes (such as CYP707A1, CBF and NAC-like genes) and improved drought stress tolerance. Interestingly, over-expression of CaBZ1 in potato did not produce undesirable growth phenotypes in major agricultural traits such as plant height, leaf size and tuber formation under normal growth conditions. The transgenic potato plants also had higher tuber yields than non transgenic potato plants under drought stress conditions. Thus, CaBZ1 may be useful for improving drought tolerance in tuber crops. This might be the first report of the production of transgenic potato with improved tuber yields under drought conditions.
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Affiliation(s)
- Seok-Jun Moon
- Molecular Breeding Division, Department of Agricultural Biotechnology, National Academy of Agricultural Science, RDA, Jeonju, 560-500, Republic of Korea
| | - Se-Youn Han
- Molecular Breeding Division, Department of Agricultural Biotechnology, National Academy of Agricultural Science, RDA, Jeonju, 560-500, Republic of Korea
| | - Dool-Yi Kim
- Crop Foundation Research Division, National Institute of Crop Science, RDA, Wanju-gun, Jeollabuk-do, 565-851, Republic of Korea
| | - In Sun Yoon
- Molecular Breeding Division, Department of Agricultural Biotechnology, National Academy of Agricultural Science, RDA, Jeonju, 560-500, Republic of Korea
| | - Dongjin Shin
- Paddy Crop Research Division, Department of Southern Area, National Institute of Crop Science, RDA, Miryang, 627-803, Republic of Korea
| | - Myung-Ok Byun
- Molecular Breeding Division, Department of Agricultural Biotechnology, National Academy of Agricultural Science, RDA, Jeonju, 560-500, Republic of Korea
| | - Hawk-Bin Kwon
- Department of Biomedical Sciences, Sunmoon University, Asan, 336-708, Republic of Korea
| | - Beom-Gi Kim
- Molecular Breeding Division, Department of Agricultural Biotechnology, National Academy of Agricultural Science, RDA, Jeonju, 560-500, Republic of Korea.
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Zhang Z, Liu W, Qi X, Liu Z, Xie W, Wang Y. Genome-wide identification, expression profiling, and SSR marker development of the bZIP transcription factor family in Medicago truncatula. BIOCHEM SYST ECOL 2015. [DOI: 10.1016/j.bse.2015.06.025] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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Ji X, Liu G, Liu Y, Nie X, Zheng L, Wang Y. The regulatory network of ThbZIP1 in response to abscisic acid treatment. FRONTIERS IN PLANT SCIENCE 2015; 6:25. [PMID: 25713576 PMCID: PMC4322638 DOI: 10.3389/fpls.2015.00025] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/19/2014] [Accepted: 01/12/2015] [Indexed: 06/04/2023]
Abstract
Previously, a bZIP transcription factor from Tamarix hispida, ThbZIP1, was characterized: plants overexpressing ThbZIP1 displayed improved salt stress tolerance but were sensitive to abscisic acid (ABA). In the current study, we further characterized the regulatory network of ThbZIP1 and the mechanism of ABA sensitivity mediated by ThbZIP1. An ABF transcription factor from T. hispida, ThABF1, directly regulates the expression of ThbZIP1. Microarray analysis identified 1662 and 1609 genes that were respectively significantly upregulated or downregulated by ThbZIP1 when exposed to ABA. Gene ontology (GO) analysis showed that the processes including "response to stimulus," "catalytic activity," "binding function," and "metabolic process" were highly altered in ThbZIP1 expressing plants exposed to ABA. The gene expression in ThbZIP1 transformed plants were compared between exposed to ABA and salt on the genome scale. Genes differentially regulated by both salt and ABA treatment only accounted for 9.75% of total differentially regulated genes. GO analysis showed that structural molecule activity, organelle part, membrane-enclosed lumen, reproduction, and reproductive process are enhanced by ABA but inhibited by salt stress. Conversely, immune system and multi-organism process were improved by salt but inhibited by ABA. Transcription regulator activity, enzyme regulator activity, and developmental process were significantly altered by ABA but were not affected by salt stress. Our study provides insights into how ThbZIP1 mediates ABA and salt stress response at the molecular level.
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Affiliation(s)
- Xiaoyu Ji
- Key Laboratory of Biogeography and Bioresource in Arid Land, Xinjiang Institute of Ecology and Geography, Chinese Academy of SciencesUrumqi, China
| | - Guifeng Liu
- State Key Laboratory of Tree Genetics and Breeding, Northeast Forestry UniversityHarbin, China
| | - Yujia Liu
- College of Food Engineering, Harbin University of CommerceHarbin, China
| | - Xianguang Nie
- State Key Laboratory of Tree Genetics and Breeding, Northeast Forestry UniversityHarbin, China
| | - Lei Zheng
- State Key Laboratory of Tree Genetics and Breeding, Northeast Forestry UniversityHarbin, China
| | - Yucheng Wang
- Key Laboratory of Biogeography and Bioresource in Arid Land, Xinjiang Institute of Ecology and Geography, Chinese Academy of SciencesUrumqi, China
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Liu J, Chen N, Chen F, Cai B, Dal Santo S, Tornielli GB, Pezzotti M, Cheng ZMM. Genome-wide analysis and expression profile of the bZIP transcription factor gene family in grapevine (Vitis vinifera). BMC Genomics 2014; 15:281. [PMID: 24725365 PMCID: PMC4023599 DOI: 10.1186/1471-2164-15-281] [Citation(s) in RCA: 144] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2013] [Accepted: 03/31/2014] [Indexed: 01/27/2023] Open
Abstract
Background Basic leucine zipper (bZIP) transcription factor gene family is one of the largest and most diverse families in plants. Current studies have shown that the bZIP proteins regulate numerous growth and developmental processes and biotic and abiotic stress responses. Nonetheless, knowledge concerning the specific expression patterns and evolutionary history of plant bZIP family members remains very limited. Results We identified 55 bZIP transcription factor-encoding genes in the grapevine (Vitis vinifera) genome, and divided them into 10 groups according to the phylogenetic relationship with those in Arabidopsis. The chromosome distribution and the collinearity analyses suggest that expansion of the grapevine bZIP (VvbZIP) transcription factor family was greatly contributed by the segment/chromosomal duplications, which may be associated with the grapevine genome fusion events. Nine intron/exon structural patterns within the bZIP domain and the additional conserved motifs were identified among all VvbZIP proteins, and showed a high group-specificity. The predicted specificities on DNA-binding domains indicated that some highly conserved amino acid residues exist across each major group in the tree of land plant life. The expression patterns of VvbZIP genes across the grapevine gene expression atlas, based on microarray technology, suggest that VvbZIP genes are involved in grapevine organ development, especially seed development. Expression analysis based on qRT-PCR indicated that VvbZIP genes are extensively involved in drought- and heat-responses, with possibly different mechanisms. Conclusions The genome-wide identification, chromosome organization, gene structures, evolutionary and expression analyses of grapevine bZIP genes provide an overall insight of this gene family and their potential involvement in growth, development and stress responses. This will facilitate further research on the bZIP gene family regarding their evolutionary history and biological functions.
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Affiliation(s)
| | | | | | | | | | | | | | - Zong-Ming Max Cheng
- College of Horticulture, Nanjing Agricultural University, 210095 Nanjing, Jiangsu, China.
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Khan M, Xu H, Hepworth SR. BLADE-ON-PETIOLE genes: setting boundaries in development and defense. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2014; 215-216:157-71. [PMID: 24388527 DOI: 10.1016/j.plantsci.2013.10.019] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2013] [Revised: 10/19/2013] [Accepted: 10/31/2013] [Indexed: 05/19/2023]
Abstract
BLADE-ON-PETIOLE (BOP) genes encode an ancient and conserved subclade of BTB-ankryin transcriptional co-activators, divergent in the NPR1 family of plant defense regulators. Arabidopsis BOP1/2 were originally characterized as regulators of leaf and floral patterning. Recent investigation of BOP activity in a variety of land plants provides a more complete picture of their conserved functions at lateral organ boundaries in the determination of leaf, flower, inflorescence, and root nodule architecture. BOPs exert their function in part through promotion of lateral organ boundary genes including ASYMMETRIC LEAVES2, KNOTTED1-LIKE FROM ARABIDOPSIS6, and ARABIDOPSIS THALIANA HOMEOBOX GENE1 whose products restrict growth, promote differentiation, and antagonize meristem activity in various developmental contexts. Mutually antagonistic interactions between BOP and meristem factors are important in maintaining a border between meristem-organ compartments and in controlling irreversible transitions in cell fate associated with differentiation. We also examine intriguing new evidence for BOP function in plant defense. Comparisons to NPR1 highlight previously unexplored mechanisms for co-ordination of development and defense in land plants.
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Affiliation(s)
- Madiha Khan
- Department of Biology, Carleton University, 1125 Colonel By Drive, Ottawa, Ontario, Canada K1S 5B6
| | - Huasong Xu
- Department of Biology, Carleton University, 1125 Colonel By Drive, Ottawa, Ontario, Canada K1S 5B6
| | - Shelley R Hepworth
- Department of Biology, Carleton University, 1125 Colonel By Drive, Ottawa, Ontario, Canada K1S 5B6.
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Stotz HU, Findling S, Nukarinen E, Weckwerth W, Mueller MJ, Berger S. A tandem affinity purification tag of TGA2 for isolation of interacting proteins in Arabidopsis thaliana. PLANT SIGNALING & BEHAVIOR 2014; 9:e972794. [PMID: 25482810 PMCID: PMC4622720 DOI: 10.4161/15592316.2014.972794] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Tandem affinity purification (TAP) tagging provides a powerful tool for isolating interacting proteins in vivo. TAP-tag purification offers particular advantages for the identification of stimulus-induced protein interactions. Type II bZIP transcription factors (TGA2, TGA5 and TGA6) play key roles in pathways that control salicylic acid, ethylene, xenobiotic and reactive oxylipin signaling. Although proteins interacting with these transcription factors have been identified through genetic and yeast 2-hybrid screening, others are still elusive. We have therefore generated a C-terminal TAP-tag of TGA2 to isolate additional proteins that interact with this transcription factor. Three lines most highly expressing TAP-tagged TGA2 were functional in that they partially complemented reactive oxylipin-responsive gene expression in a tga2 tga5 tga6 triple mutant. TAP-tagged TGA2 in the most strongly overexpressing line was proteolytically less stable than in the other 2 lines. Only this overexpressing line could be used in a 2-step purification process, resulting in isolation of co-purifying bands of larger molecular weight than TGA2. TAP-tagged TGA2 was used to pull down NPR1, a protein known to interact with this transcription factor. Mass spectrometry was used to identify peptides that co-purified with TAP-tagged TGA2. Having generated this TGA2 TAP-tag line will therefore be an asset to researchers interested in stimulus-induced signal transduction processes.
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Key Words
- 12-oxo-phytodienoic acid
- CBB, calmodulin binding buffer
- CBP, calmodulin-binding peptide
- CaMV, cauliflower mosaic virus
- FDR, false discovery rate
- MS, mass spectrometry
- OPDA, 12-oxo-phytodienoic acid
- PGA1, prostaglandin A1
- PPA1, phytoprostane A1
- RubisCo, ribulose-1,5-bisphosphate carboxylase
- SA, salicylic acid
- SAR, systemic acquired resistance
- TAP, tandem affinity purification
- TEV, tobacco etch virus
- Y2H, yeast 2-hybrid
- bZIP, basic region/leucine zipper motif
- glutathione-S-transferase
- lipid stress
- protein complex
- thale cress
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Affiliation(s)
- Henrik U Stotz
- Julius-von-Sachs-Institute für Biowissenschaften; Pharmazeutische Biologie; Universität Würzburg; Würzburg, Germany
- School of Life and Medical Sciences; University of Hertfordshire; Hatfield, U.K
- Correspondence to: Henrik U Stotz;
| | - Simone Findling
- Julius-von-Sachs-Institute für Biowissenschaften; Pharmazeutische Biologie; Universität Würzburg; Würzburg, Germany
| | - Ella Nukarinen
- Molecular Systems Biology; Faculty of Life Sciences; University of Vienna; Vienna, Austria
| | - Wolfram Weckwerth
- Molecular Systems Biology; Faculty of Life Sciences; University of Vienna; Vienna, Austria
| | - Martin J Mueller
- Julius-von-Sachs-Institute für Biowissenschaften; Pharmazeutische Biologie; Universität Würzburg; Würzburg, Germany
| | - Susanne Berger
- Julius-von-Sachs-Institute für Biowissenschaften; Pharmazeutische Biologie; Universität Würzburg; Würzburg, Germany
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Defense responses in two ecotypes of Lotus japonicus against non-pathogenic Pseudomonas syringae. PLoS One 2013; 8:e83199. [PMID: 24349460 PMCID: PMC3859661 DOI: 10.1371/journal.pone.0083199] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2013] [Accepted: 10/30/2013] [Indexed: 11/20/2022] Open
Abstract
Lotus japonicus is a model legume broadly used to study many important processes as nitrogen fixing nodule formation and adaptation to salt stress. However, no studies on the defense responses occurring in this species against invading microorganisms have been carried out at the present. Understanding how this model plant protects itself against pathogens will certainly help to develop more tolerant cultivars in economically important Lotus species as well as in other legumes. In order to uncover the most important defense mechanisms activated upon bacterial attack, we explored in this work the main responses occurring in the phenotypically contrasting ecotypes MG-20 and Gifu B-129 of L. japonicus after inoculation with Pseudomonas syringae DC3000 pv. tomato. Our analysis demonstrated that this bacterial strain is unable to cause disease in these accessions, even though the defense mechanisms triggered in these ecotypes might differ. Thus, disease tolerance in MG-20 was characterized by bacterial multiplication, chlorosis and desiccation at the infiltrated tissues. In turn, Gifu B-129 plants did not show any symptom at all and were completely successful in restricting bacterial growth. We performed a microarray based analysis of these responses and determined the regulation of several genes that could play important roles in plant defense. Interestingly, we were also able to identify a set of defense genes with a relative high expression in Gifu B-129 plants under non-stress conditions, what could explain its higher tolerance. The participation of these genes in plant defense is discussed. Our results position the L. japonicus-P. syringae interaction as a interesting model to study defense mechanisms in legume species.
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Lee S, Choi D. Comparative transcriptome analysis of pepper (Capsicum annuum) revealed common regulons in multiple stress conditions and hormone treatments. PLANT CELL REPORTS 2013; 32:1351-1359. [PMID: 23649878 DOI: 10.1007/s00299-013-1447-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2012] [Revised: 04/09/2013] [Accepted: 04/21/2013] [Indexed: 05/27/2023]
Abstract
Global transcriptome analysis revealed common regulons for biotic/abiotic stresses, and some of these regulons encoding signaling components in both stresses were newly identified in this study. In this study, we aimed to identify plant responses to multiple stress conditions and discover the common regulons activated under a variety of stress conditions. Global transcriptome analysis revealed that salicylic acid (SA) may affect the activation of abiotic stress-responsive genes in pepper. Our data indicate that methyl jasmonate (MeJA) and ethylene (ET)-responsive genes were primarily activated by biotic stress, while abscisic acid (ABA)-responsive genes were activated under both types of stresses. We also identified differentially expressed gene (DEG) responses to specific stress conditions. Biotic stress induces more DEGs than those induced by abiotic and hormone applications. The clustering analysis using DEGs indicates that there are common regulons for biotic or abiotic stress conditions. Although SA and MeJA have an antagonistic effect on gene expression levels, SA and MeJA show a largely common regulation as compared to the regulation at the DEG expression level induced by other hormones. We also monitored the expression profiles of DEG encoding signaling components. Twenty-two percent of these were commonly expressed in both stress conditions. The importance of this study is that several genes commonly regulated by both stress conditions may have future applications for creating broadly stress-tolerant pepper plants. This study revealed that there are complex regulons in pepper plant to both biotic and abiotic stress conditions.
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Affiliation(s)
- Sanghyeob Lee
- Department of Bioresource Engineering and Plant Engineering Research Institute, Sejong University, 98 Gunja-dong, Gwangjin-gu, Seoul 143-747, Korea,
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Suzuki H, Dowd PF, Johnson ET, Hum-Musser SM, Musser RO. Effects of elevated peroxidase levels and corn earworm feeding on gene expression in tomato. J Chem Ecol 2012; 38:1247-63. [PMID: 23135603 DOI: 10.1007/s10886-012-0205-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2011] [Revised: 05/15/2012] [Accepted: 05/24/2012] [Indexed: 01/04/2023]
Abstract
Microarray analysis was used to measure the impact of herbivory by Helicoverpa zea, (corn earworm caterpillar) on wild-type and transgenic tomato, Solanum lycopersicum, plants that over-express peroxidase. Caterpillar herbivory had by far the greatest affect on gene expression, but the peroxidase transgene also altered the expression of a substantial number of tomato genes. Particularly high peroxidase activity resulted in the up-regulation of genes encoding proteinase inhibitors, pathogenesis-related (PR) proteins, as well as proteins associated with iron and calcium transport, and flowering. In a separate experiment conducted under similar conditions, real-time quantitative polymerase chain reaction (qPCR) analysis confirmed our microarray results for many genes. There was some indication that multiple regulatory interactions occurred due to the interaction of the different treatments. While herbivory had the greatest impact on tomato gene expression, our results suggest that levels of expression of a multifunctional gene, such as peroxidase and its products, can influence other gene expression systems distinct from conventional signaling pathways, further indicating the complexity of plant defensive responses to insects.
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Affiliation(s)
- Hideaki Suzuki
- Department of Biological Sciences, Western Illinois University, Macomb, IL 61455, USA
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van Verk MC, Neeleman L, Bol JF, Linthorst HJM. Tobacco Transcription Factor NtWRKY12 Interacts with TGA2.2 in vitro and in vivo. FRONTIERS IN PLANT SCIENCE 2011; 2:32. [PMID: 22639590 PMCID: PMC3355607 DOI: 10.3389/fpls.2011.00032] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2011] [Accepted: 07/07/2011] [Indexed: 05/29/2023]
Abstract
The promoter of the salicylic acid-inducible PR-1a gene of Nicotiana tabacum contains binding sites for transcription factor NtWRKY12 (WK-box at position -564) and TGA factors (as-1-like element at position -592). Transactivation experiments in Arabidopsis protoplasts derived from wild type, npr1-1, tga256, and tga2356 mutant plants revealed that NtWRKY12 alone was able to induce a PR-1a::β-glucuronidase (GUS) reporter gene to high levels, independent of co-expressed tobacco NtNPR1, TGA2.1, TGA2.2, or endogenous Arabidopsis NPR1, TGA2/3/5/6. By in vitro pull-down assays with GST and Strep fusion proteins and by Fluorescence Resonance Energy Transfer assays with protein-CFP and protein-YFP fusions in transfected protoplasts, it was shown that NtWRKY12 and TGA2.2 could interact in vitro and in vivo. Interaction of NtWRKY12 with TGA1a or TGA2.1 was not detectable by these techniques. A possible mechanism for the role of NtWRKY12 and TGA2.2 in PR-1a gene expression is discussed.
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Affiliation(s)
- Marcel C. van Verk
- Sylvius Laboratory, Institute of Biology, Leiden UniversityLeiden, Netherlands
| | - Lyda Neeleman
- Sylvius Laboratory, Institute of Biology, Leiden UniversityLeiden, Netherlands
| | - John F. Bol
- Sylvius Laboratory, Institute of Biology, Leiden UniversityLeiden, Netherlands
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Wang J, Zhou J, Zhang B, Vanitha J, Ramachandran S, Jiang SY. Genome-wide expansion and expression divergence of the basic leucine zipper transcription factors in higher plants with an emphasis on sorghum. JOURNAL OF INTEGRATIVE PLANT BIOLOGY 2011; 53:212-31. [PMID: 21205183 DOI: 10.1111/j.1744-7909.2010.01017.x] [Citation(s) in RCA: 107] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Plant bZIP transcription factors play crucial roles in multiple biological processes. However, little is known about the sorghum bZIP gene family although the sorghum genome has been completely sequenced. In this study, we have carried out a genome-wide identification and characterization of this gene family in sorghum. Our data show that the genome encodes at least 92 bZIP transcription factors. These bZIP genes have been expanded mainly by segmental duplication. Such an expansion mechanism has also been observed in rice, arabidopsis and many other plant organisms, suggesting a common expansion mode of this gene family in plants. Further investigation shows that most of the bZIP members have been present in the most recent common ancestor of sorghum and rice and the major expansion would occur before the sorghum-rice split era. Although these bZIP genes have been duplicated with a long history, they exhibited limited functional divergence as shown by nonsynonymous substitutions (Ka)/synonymous substitutions (Ks) analyses. Their retention was mainly due to the high percentages of expression divergence. Our data also showed that this gene family might play a role in multiple developmental stages and tissues and might be regarded as important regulators of various abiotic stresses and sugar signaling.
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Affiliation(s)
- Jizhou Wang
- Institute of Botany and Temasek Life Sciences Laboratory Joint Research & Development Laboratory, Institute of Botany, the Chinese Academy of Sciences, Beijing 100093, China
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Lopes MA, Hora BT, Dias CV, Santos GC, Gramacho KP, Cascardo JCM, Gesteira AS, Micheli F. Expression analysis of transcription factors from the interaction between cacao and Moniliophthora perniciosa (Tricholomataceae). GENETICS AND MOLECULAR RESEARCH 2010; 9:1279-97. [PMID: 20623454 DOI: 10.4238/vol9-3gmr825] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Cacao (Theobroma cacao) is one of the most important tropical crops; however, production is threatened by numerous pathogens, including the hemibiotrophic fungus Moniliophthora perniciosa, which causes witches' broom disease. To understand the mechanisms that lead to the development of this disease in cacao, we focused our attention on cacao transcription factors (TFs), which act as master regulators of cellular processes and are important for the fine-tuning of plant defense responses. We developed a macroarray with 88 TF cDNA from previously obtained cacao-M. perniciosa interaction libraries. Seventy-two TFs were found differentially expressed between the susceptible (Catongo) and resistant (TSH1188) genotypes and/or during the disease time course--from 24 h to 30 days after infection. Most of the differentially expressed TFs belonged to the bZIP, MYB and WRKY families and presented opposite expression patterns in susceptible and resistant cacao-M. perniciosa interactions (i.e., up-regulated in Catongo and down-regulated in TSH1188). The results of the macroarray were confirmed for bZIP and WRKY TFs by real-time PCR. These differentially expressed TFs are good candidates for subsequent functional analysis as well as for plant engineering. Some of these TFs could also be localized on the cacao reference map related to witches' broom resistance, facilitating the breeding and selection of resistant cacao trees.
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Affiliation(s)
- M A Lopes
- Laboratório de Genômica e Expressão Gênica, Departamento de Genética e Biologia Molecular, Universidade Estadual de Santa Cruz, Ilhéus, BA, Brasil
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Hsieh TH, Li CW, Su RC, Cheng CP, Tsai YC, Chan MT. A tomato bZIP transcription factor, SlAREB, is involved in water deficit and salt stress response. PLANTA 2010; 231:1459-73. [PMID: 20358223 DOI: 10.1007/s00425-010-1147-4] [Citation(s) in RCA: 109] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2009] [Accepted: 03/10/2010] [Indexed: 05/03/2023]
Abstract
Abiotic stresses such as cold, water deficit, and salt stresses severely reduce crop productivity. Tomato (Solanum lycopersicum) is an important economic crop; however, not much is known about its stress responses. To gain insight into stress-responsive gene regulation in tomato plants, we identified transcription factors from a tomato cDNA microarray. An ABA-responsive element binding protein (AREB) was identified and named SlAREB. In tomato protoplasts, SlAREB transiently transactivated luciferase reporter gene expression driven by AtRD29A (responsive to dehydration) and SlLAP (leucine aminopeptidase) promoters with exogenous ABA application, which was suppressed by the kinase inhibitor staurosporine, indicating that an ABA-dependent post-translational modification is required for the transactivation ability of SlAREB protein. Electrophoretic mobility shift assays showed that the recombinant DNA-binding domain of SlAREB protein is able to bind AtRD29A and SlLAP promoter regions. Constitutively expressed SlAREB increased tolerance to water deficit and high salinity stresses in both Arabidopsis and tomato plants, which maintained PSII and membrane integrities as well as water content in plant bodies. Overproduction of SlAREB in Arabidopsis thaliana and tomato plants regulated stress-related genes AtRD29A, AtCOR47, and SlCI7-like dehydrin under ABA and abiotic stress treatments. Taken together, these results show that SlAREB functions to regulate some stress-responsive genes and that its overproduction improves plant tolerance to water deficit and salt stress.
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Affiliation(s)
- Tsai-Hung Hsieh
- Agricultural Biotechnology Research Center, Academia Sinica, Taipei 115, Taiwan
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Ashraf N, Ghai D, Barman P, Basu S, Gangisetty N, Mandal MK, Chakraborty N, Datta A, Chakraborty S. Comparative analyses of genotype dependent expressed sequence tags and stress-responsive transcriptome of chickpea wilt illustrate predicted and unexpected genes and novel regulators of plant immunity. BMC Genomics 2009; 10:415. [PMID: 19732460 PMCID: PMC2755012 DOI: 10.1186/1471-2164-10-415] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2009] [Accepted: 09/05/2009] [Indexed: 12/15/2022] Open
Abstract
BACKGROUND The ultimate phenome of any organism is modulated by regulated transcription of many genes. Characterization of genetic makeup is thus crucial for understanding the molecular basis of phenotypic diversity, evolution and response to intra- and extra-cellular stimuli. Chickpea is the world's third most important food legume grown in over 40 countries representing all the continents. Despite its importance in plant evolution, role in human nutrition and stress adaptation, very little ESTs and differential transcriptome data is available, let alone genotype-specific gene signatures. Present study focuses on Fusarium wilt responsive gene expression in chickpea. RESULTS We report 6272 gene sequences of immune-response pathway that would provide genotype-dependent spatial information on the presence and relative abundance of each gene. The sequence assembly led to the identification of a CaUnigene set of 2013 transcripts comprising of 973 contigs and 1040 singletons, two-third of which represent new chickpea genes hitherto undiscovered. We identified 209 gene families and 262 genotype-specific SNPs. Further, several novel transcription regulators were identified indicating their possible role in immune response. The transcriptomic analysis revealed 649 non-cannonical genes besides many unexpected candidates with known biochemical functions, which have never been associated with pathostress-responsive transcriptome. CONCLUSION Our study establishes a comprehensive catalogue of the immune-responsive root transcriptome with insight into their identity and function. The development, detailed analysis of CaEST datasets and global gene expression by microarray provide new insight into the commonality and diversity of organ-specific immune-responsive transcript signatures and their regulated expression shaping the species specificity at genotype level. This is the first report on differential transcriptome of an unsequenced genome during vascular wilt.
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Affiliation(s)
- Nasheeman Ashraf
- National Institute of Plant Genome Research, Aruna Asaf Ali Marg, New Delhi-110067, India
| | - Deepali Ghai
- National Institute of Plant Genome Research, Aruna Asaf Ali Marg, New Delhi-110067, India
| | - Pranjan Barman
- National Institute of Plant Genome Research, Aruna Asaf Ali Marg, New Delhi-110067, India
| | - Swaraj Basu
- National Institute of Plant Genome Research, Aruna Asaf Ali Marg, New Delhi-110067, India
| | - Nagaraju Gangisetty
- National Institute of Plant Genome Research, Aruna Asaf Ali Marg, New Delhi-110067, India
| | - Mihir K Mandal
- National Institute of Plant Genome Research, Aruna Asaf Ali Marg, New Delhi-110067, India
| | - Niranjan Chakraborty
- National Institute of Plant Genome Research, Aruna Asaf Ali Marg, New Delhi-110067, India
| | - Asis Datta
- National Institute of Plant Genome Research, Aruna Asaf Ali Marg, New Delhi-110067, India
| | - Subhra Chakraborty
- National Institute of Plant Genome Research, Aruna Asaf Ali Marg, New Delhi-110067, India
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75
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Chen YY, Lin YM, Chao TC, Wang JF, Liu AC, Ho FI, Cheng CP. Virus-induced gene silencing reveals the involvement of ethylene-, salicylic acid- and mitogen-activated protein kinase-related defense pathways in the resistance of tomato to bacterial wilt. PHYSIOLOGIA PLANTARUM 2009; 136:324-35. [PMID: 19470092 DOI: 10.1111/j.1399-3054.2009.01226.x] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Bacterial wilt (BW), caused by Ralstonia solanacearum, is a devastating vascular disease of tomato worldwide. However, information on tomato's defense mechanism against infection by this soil-borne bacterium is limited. In this study, virus-induced gene silencing (VIGS) was employed to decipher signaling pathways involved in the resistance of tomato to this pathogen. Defined sequence fragments derived from a group of genes known or predicted to be involved in ethylene (ET) and salicylic acid (SA) signaling transduction pathways and mitogen-activated protein kinase (MAPK) cascades were subjected to VIGS in 'Hawaii 7996', a tomato cultivar with stable resistance to BW, and their effect on resistance was determined. The results indicated that silencing of ACO1/3, EIN2, ERF3, NPR1, TGA2.2, TGA1a, MKK2, MPK1/2 and MPK3 caused significant increase in bacterial proliferation in stembases and/or mid-stems. Partial wilting symptoms appeared on plants in which TGA2.2, TGA2.1a, MKK2 and MPK1/2 were silenced. These results suggested that ET-, SA- and MAPK-related defense signaling pathways are involved in the resistance of tomato to BW. This is the first report elucidating the multiple layers of defense governing the resistance of tomato to BW. The results are discussed to enlighten an important and complex interaction between tomato and a soil-borne vascular pathogen.
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Affiliation(s)
- Yong-Yi Chen
- Graduate Institute of Plant Biology and Department of Life Science, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei, Taiwan 106, Republic of China
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76
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Blanco F, Salinas P, Cecchini NM, Jordana X, Van Hummelen P, Alvarez ME, Holuigue L. Early genomic responses to salicylic acid in Arabidopsis. PLANT MOLECULAR BIOLOGY 2009; 70:79-102. [PMID: 19199050 DOI: 10.1007/s11103-009-9458-1] [Citation(s) in RCA: 83] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2008] [Accepted: 01/11/2009] [Indexed: 05/21/2023]
Abstract
Salicylic acid (SA) is a stress-induced hormone involved in the activation of defense genes. Here we analyzed the early genetic responses to SA of wild type and npr1-1 mutant Arabidopsis seedlings, using Complete Arabidopsis Transcriptome MicroArray (CATMAv2) chip. We identified 217 genes rapidly induced by SA (early SAIGs); 193 by a NPR1-dependent and 24 by a NPR1-independent pathway. These two groups of genes also differed in their functional classification, expression profiles and over-representation of cis-elements, supporting differential pathways for their activation. Examination of the expression patterns for selected early SAIGs from both groups indicated that their activation by SA required TGA2/5/6 subclass of transcription factors. These genes were also activated by Pseudomonas syringae pv. tomato AvrRpm1, suggesting that they might play a role in defense against bacteria. This study gives a global idea of the early response to SA in Arabidopsis seedlings, expanding our knowledge about SA function in plant defense.
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Affiliation(s)
- Francisca Blanco
- Departamento de Genética Molecular y Microbiología, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, P.O. Box 114-D, Santiago, Chile
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77
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Genome-wide analysis of basic leucine zipper transcription factor families in Arabidopsis thaliana, Oryza sativa and Populus trichocarpa. ACTA ACUST UNITED AC 2009. [DOI: 10.1007/s11741-009-0216-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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78
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Vlot AC, Dempsey DA, Klessig DF. Salicylic Acid, a multifaceted hormone to combat disease. ANNUAL REVIEW OF PHYTOPATHOLOGY 2009; 47:177-206. [PMID: 19400653 DOI: 10.1146/annurev.phyto.050908.135202] [Citation(s) in RCA: 1303] [Impact Index Per Article: 86.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
For more than 200 years, the plant hormone salicylic acid (SA) has been studied for its medicinal use in humans. However, its extensive signaling role in plants, particularly in defense against pathogens, has only become evident during the past 20 years. This review surveys how SA in plants regulates both local disease resistance mechanisms, including host cell death and defense gene expression, and systemic acquired resistance (SAR). Genetic studies reveal an increasingly complex network of proteins required for SA-mediated defense signaling, and this process is amplified by several regulatory feedback loops. The interaction between the SA signaling pathway and those regulated by other plant hormones and/or defense signals is also discussed.
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Affiliation(s)
- A Corina Vlot
- Max Planck Institute for Plant Breeding Research, 50829 Cologne, Germany.
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79
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Fode B, Siemsen T, Thurow C, Weigel R, Gatz C. The Arabidopsis GRAS protein SCL14 interacts with class II TGA transcription factors and is essential for the activation of stress-inducible promoters. THE PLANT CELL 2008; 20:3122-35. [PMID: 18984675 PMCID: PMC2613660 DOI: 10.1105/tpc.108.058974] [Citation(s) in RCA: 171] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2008] [Revised: 10/10/2008] [Accepted: 10/24/2008] [Indexed: 05/17/2023]
Abstract
The plant signaling molecule salicylic acid (SA) and/or xenobiotic chemicals like the auxin mimic 2,4-D induce transcriptional activation of defense- and stress-related genes that contain activation sequence-1 (as-1)-like cis-elements in their promoters. as-1-like sequences are recognized by basic/leucine zipper transcription factors of the TGA family. Expression of genes related to the SA-dependent defense program systemic acquired resistance requires the TGA-interacting protein NPR1. However, a number of as-1-containing promoters can be activated independently from NPR1. Here, we report the identification of Arabidopsis thaliana SCARECROW-like 14 (SCL14), a member of the GRAS family of regulatory proteins, as a TGA-interacting protein that is required for the activation of TGA-dependent but NPR1-independent SA- and 2,4-D-inducible promoters. Chromatin immunoprecipitation experiments revealed that class II TGA factors TGA2, TGA5, and/or TGA6 are needed to recruit SCL14 to promoters of selected SCL14 target genes identified by whole-genome transcript profiling experiments. The coding regions and the expression profiles of the SCL14-dependent genes imply that they might be involved in the detoxification of xenobiotics and possibly endogenous harmful metabolites. Consistently, plants ectopically expressing SCL14 showed increased tolerance to toxic doses of the chemicals isonicotinic acid and 2,4,6-triiodobenzoic acid, whereas the scl14 and the tga2 tga5 tga6 mutants were more susceptible. Hence, the TGA/SCL14 complex seems to be involved in the activation of a general broad-spectrum detoxification network upon challenge of plants with xenobiotics.
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Affiliation(s)
- Benjamin Fode
- Albrecht-von-Haller-Institut für Pflanzenwissenschaften, Georg-August-Universität Göttingen, D-37073 Göttingen, Germany
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80
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Corrêa LGG, Riaño-Pachón DM, Schrago CG, dos Santos RV, Mueller-Roeber B, Vincentz M. The role of bZIP transcription factors in green plant evolution: adaptive features emerging from four founder genes. PLoS One 2008; 3:e2944. [PMID: 18698409 PMCID: PMC2492810 DOI: 10.1371/journal.pone.0002944] [Citation(s) in RCA: 205] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2008] [Accepted: 07/22/2008] [Indexed: 01/07/2023] Open
Abstract
Background Transcription factors of the basic leucine zipper (bZIP) family control important processes in all eukaryotes. In plants, bZIPs are regulators of many central developmental and physiological processes including photomorphogenesis, leaf and seed formation, energy homeostasis, and abiotic and biotic stress responses. Here we performed a comprehensive phylogenetic analysis of bZIP genes from algae, mosses, ferns, gymnosperms and angiosperms. Methodology/Principal Findings We identified 13 groups of bZIP homologues in angiosperms, three more than known before, that represent 34 Possible Groups of Orthologues (PoGOs). The 34 PoGOs may correspond to the complete set of ancestral angiosperm bZIP genes that participated in the diversification of flowering plants. Homologous genes dedicated to seed-related processes and ABA-mediated stress responses originated in the common ancestor of seed plants, and three groups of homologues emerged in the angiosperm lineage, of which one group plays a role in optimizing the use of energy. Conclusions/Significance Our data suggest that the ancestor of green plants possessed four bZIP genes functionally involved in oxidative stress and unfolded protein responses that are bZIP-mediated processes in all eukaryotes, but also in light-dependent regulations. The four founder genes amplified and diverged significantly, generating traits that benefited the colonization of new environments.
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Affiliation(s)
- Luiz Gustavo Guedes Corrêa
- Centro de Biologia Molecular e Engenharia Genética, Departamento de Genética e Evolução, Instituto de Biologia, Universidade Estadual de Campinas, Campinas, Brazil
- Department of Molecular Biology, University of Potsdam, Potsdam-Golm, Germany
- Cooperative Research Group, Max-Planck Institute of Molecular Plant Physiology, Potsdam-Golm, Germany
| | - Diego Mauricio Riaño-Pachón
- Department of Molecular Biology, University of Potsdam, Potsdam-Golm, Germany
- GabiPD Team, Bioinformatics Group, Max-Planck Institute of Molecular Plant Physiology, Potsdam-Golm, Germany
| | - Carlos Guerra Schrago
- Laboratório de Biodiversidade Molecular, Departamento de Genética, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Renato Vicentini dos Santos
- Centro de Biologia Molecular e Engenharia Genética, Departamento de Genética e Evolução, Instituto de Biologia, Universidade Estadual de Campinas, Campinas, Brazil
| | - Bernd Mueller-Roeber
- Department of Molecular Biology, University of Potsdam, Potsdam-Golm, Germany
- Cooperative Research Group, Max-Planck Institute of Molecular Plant Physiology, Potsdam-Golm, Germany
| | - Michel Vincentz
- Centro de Biologia Molecular e Engenharia Genética, Departamento de Genética e Evolução, Instituto de Biologia, Universidade Estadual de Campinas, Campinas, Brazil
- * E-mail:
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81
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Schütze K, Harter K, Chaban C. Post-translational regulation of plant bZIP factors. TRENDS IN PLANT SCIENCE 2008; 13:247-55. [PMID: 18424222 DOI: 10.1016/j.tplants.2008.03.002] [Citation(s) in RCA: 92] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2007] [Revised: 02/14/2008] [Accepted: 03/21/2008] [Indexed: 05/07/2023]
Abstract
The post-translational regulation of transcription factors plays an important role in the control of gene expression in eukaryotes. The mechanisms of regulation include not only factor modifications but also regulated protein-protein interaction, protein degradation and intracellular partitioning. In plants, the basic-region leucine zipper (bZIP) transcription factors contribute to many transcriptional response pathways. Despite this, little is known about their post-translational regulation. Recent findings suggest that plant bZIP factors are under the control of various partially signal-induced and reversible post-translational mechanisms that are crucial for the control of their function. However, the fact that, to date, only a few plant bZIPs have been analyzed with respect to post-translational regulation indicates that we have just identified the tip of an iceberg.
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Affiliation(s)
- Katia Schütze
- Zentrum für Molekularbiologie der Pflanzen, Pflanzenphysiologie, Universität Tübingen, Auf der Morgenstelle 1, Tübingen, Germany
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82
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Nijhawan A, Jain M, Tyagi AK, Khurana JP. Genomic survey and gene expression analysis of the basic leucine zipper transcription factor family in rice. PLANT PHYSIOLOGY 2008; 146:333-50. [PMID: 18065552 PMCID: PMC2245831 DOI: 10.1104/pp.107.112821] [Citation(s) in RCA: 390] [Impact Index Per Article: 24.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2007] [Accepted: 11/28/2007] [Indexed: 05/18/2023]
Abstract
The basic leucine (Leu) zipper (bZIP) proteins compose a family of transcriptional regulators present exclusively in eukaryotes. The bZIP proteins characteristically harbor a bZIP domain composed of two structural features: a DNA-binding basic region and the Leu zipper dimerization region. They have been shown to regulate diverse plant-specific phenomena, including seed maturation and germination, floral induction and development, and photomorphogenesis, and are also involved in stress and hormone signaling. We have identified 89 bZIP transcription factor-encoding genes in the rice (Oryza sativa) genome. Their chromosomal distribution and sequence analyses suggest that the bZIP transcription factor family has evolved via gene duplication. The phylogenetic relationship among rice bZIP domains as well as with bZIP domains from other plant bZIP factors suggests that homologous bZIP domains exist in plants. Similar intron/exon structural patterns were observed in the basic and hinge regions of their bZIP domains. Detailed sequence analysis has been done to identify additional conserved motifs outside the bZIP domain and to predict their DNA-binding site specificity as well as dimerization properties, which has helped classify them into different groups and subfamilies, respectively. Expression of bZIP transcription factor-encoding genes has been analyzed by full-length cDNA and expressed sequence tag-based expression profiling. This expression profiling was complemented by microarray analysis. The results indicate specific or coexpression patterns of rice bZIP transcription factors starting from floral transition to various stages of panicle and seed development. bZIP transcription factor-encoding genes in rice also displayed differential expression patterns in rice seedlings in response to abiotic stress and light irradiation. An effort has been made to link the structure and expression pattern of bZIP transcription factor-encoding genes in rice to their function, based on the information obtained from our analyses and earlier known results. This information will be important for functional characterization of bZIP transcription factors in rice.
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Affiliation(s)
- Aashima Nijhawan
- Interdisciplinary Centre for Plant Genomics and Department of Plant Molecular Biology, University of Delhi South Campus, New Delhi 110021, India
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83
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Libault M, Wan J, Czechowski T, Udvardi M, Stacey G. Identification of 118 Arabidopsis transcription factor and 30 ubiquitin-ligase genes responding to chitin, a plant-defense elicitor. MOLECULAR PLANT-MICROBE INTERACTIONS : MPMI 2007; 20:900-11. [PMID: 17722694 DOI: 10.1094/mpmi-20-8-0900] [Citation(s) in RCA: 170] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Chitin, found in the cell walls of true fungi and the exoskeleton of insects and nematodes, is a well-established elicitor of plant defense responses. In this study, we analyzed the expression patterns of Arabidopsis thaliana transcription factor (TF) and ubiquitin-ligase genes in response to purified chitooctaose at different treatment times (15, 30, 60, 90, and 120 min after treatment), using both quantitative polymerase chain reaction and the Affymetrix Arabidopsis whole-genome array. A total of 118 TF genes and 30 ubiquitin-ligase genes were responsive to the chitin treatment. Among these genes, members from the following four TF families were overrepresented: APETALA2/ethylene-reponsive element binding proteins (27), C2H2 zinc finger proteins (14), MYB domain-containing proteins (11), and WRKY domain transcription factors (14). Transcript variants from a few of these genes were found to respond differentially to chitin, suggesting transcript-specific regulation of these TF genes.
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Affiliation(s)
- Marc Libault
- National Center for Soybean Biotechnology, Division of Plant Science, Department of Molecular Microbiology and Immunology, Christopher S. Bond Life Sciences Center, University of Missouri, Columbia, MO 65211, USA.
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84
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Kesarwani M, Yoo J, Dong X. Genetic interactions of TGA transcription factors in the regulation of pathogenesis-related genes and disease resistance in Arabidopsis. PLANT PHYSIOLOGY 2007; 144:336-46. [PMID: 17369431 PMCID: PMC1913812 DOI: 10.1104/pp.106.095299] [Citation(s) in RCA: 223] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
TGA transcription factors are implicated as regulators of pathogenesis-related (PR) genes because of their physical interaction with the known positive regulator, nonexpresser of PR gene1 (NPR1). A triple-knockout mutant tga2-1 tga5-1 tga6-1 was shown previously to be defective in the induction of PR genes and systemic acquired resistance, confirming their role in disease resistance. However, the contributions of individual TGA factors have been difficult to discern because of functional redundancy among these factors, as well as possible dual functions for some single factors. In this study, we characterized six TGA factors by reverse genetics. We show that TGA3 is required for both basal and 2,6-dichloroisonicotinic acid-induced transcription of PR genes. The tga3-1 mutants were found to be defective in basal pathogen resistance, whereas induced resistance was unaffected. TGA1 and TGA4 play partially redundant roles in regulation of basal resistance, having only moderate effects on PR gene expression. Additionally, an activation-tagged mutant of TGA6 was able to increase basal as well as induced expression of PR1, demonstrating a positive role for TGA6 on PR gene expression. In contrast, TGA2 has repressor activity on PR gene expression even though it can act as a positive regulator in the tga5-1 tga6-1 null mutant background. Finally, we examined the genetic interaction between tga2-2 and suppressor of npr1 inducible1 (sni1-1). TGA2's repressor activity overlaps with SNI1 because the tga2-2 sni1-1 double mutant shows a synergistic effect on PR gene expression.
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Affiliation(s)
- Meenu Kesarwani
- Department of Biology, Duke University, Durham, NC 27708, USA.
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85
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Ndamukong I, Abdallat AA, Thurow C, Fode B, Zander M, Weigel R, Gatz C. SA-inducible Arabidopsis glutaredoxin interacts with TGA factors and suppresses JA-responsive PDF1.2 transcription. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2007; 50:128-39. [PMID: 17397508 DOI: 10.1111/j.1365-313x.2007.03039.x] [Citation(s) in RCA: 264] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Salicylic acid (SA) is a plant signaling molecule that mediates the induction of defense responses upon attack by a variety of pathogens. Moreover, it antagonizes gene induction by the stress signaling molecule jasmonic acid (JA). Several SA-responsive genes are regulated by basic/leucine zipper-type transcription factors of the TGA family. TGA factors interact with NPR1, a central regulator of many SA-induced defense responses including SA/JA antagonism. In order to identify further regulatory proteins of SA-dependent signaling pathways, a yeast protein interaction screen with tobacco TGA2.2 as bait and an Arabidopsis thaliana cDNA prey library was performed and led to the identification of a member of the glutaredoxin family (GRX480, encoded by At1g28480). Glutaredoxins are candidates for mediating redox regulation of proteins because of their capacity to catalyze disulfide transitions. This agrees with previous findings that the redox state of both TGA1 and NPR1 changes under inducing conditions. Transgenic Arabidopsis plants ectopically expressing GRX480 show near wild-type expression of standard marker genes for SA- and xenobiotic-inducible responses. In contrast, transcription of the JA-dependent defensin gene PDF1.2 was antagonized by transgenic GRX480. This, together with the observation that GRX480 transcription is SA-inducible and requires NPR1, suggests a role of GRX480 in SA/JA cross-talk. Suppression of PDF1.2 by GRX480 depends on the presence of TGA factors, indicating that the GRX480/TGA interaction is effective in planta.
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Affiliation(s)
- Ivan Ndamukong
- Albrecht-von-Haller-Institut für Pflanzenwissenschaften, Georg-August-Universität Göttingen, Untere Karspüle 2, D-37073 Göttingen, Germany
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86
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Develey-Rivière MP, Galiana E. Resistance to pathogens and host developmental stage: a multifaceted relationship within the plant kingdom. THE NEW PHYTOLOGIST 2007; 175:405-416. [PMID: 17635216 DOI: 10.1111/j.1469-8137.2007.02130.x] [Citation(s) in RCA: 124] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
The induction of resistance to disease during plant development is widespread in the plant kingdom. Resistance appears at different stages of host development, varies with plant age or tissue maturity, may be specific or broad-spectrum and is driven by diverse mechanisms, depending on plantpathogen interactions. Studies of these forms of resistance may help us to evaluate more exhaustively the plethora of levels of regulation during development, the variability of the defense potential of developing hosts and may have practical applications, making it possible to reduce pesticide applications. Here, we review the various types of developmental resistance in plants and current knowledge of the molecular and cellular processes involved in their expression. We discuss the implications of these studies, which provide new knowledge from the molecular to the agrosystem level.
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Affiliation(s)
- Marie-Pierre Develey-Rivière
- UMR1064 Interactions Plantes-Microorganismes et Santé Végétale, INRA-Université Nice Sophia-Antipolis-CNRS, F 06903 Sophia Antipolis Cedex, France
| | - Eric Galiana
- UMR1064 Interactions Plantes-Microorganismes et Santé Végétale, INRA-Université Nice Sophia-Antipolis-CNRS, F 06903 Sophia Antipolis Cedex, France
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87
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Butterbrodt T, Thurow C, Gatz C. Chromatin immunoprecipitation analysis of the tobacco PR-1a- and the truncated CaMV 35S promoter reveals differences in salicylic acid-dependent TGA factor binding and histone acetylation. PLANT MOLECULAR BIOLOGY 2006; 61:665-74. [PMID: 16897482 DOI: 10.1007/s11103-006-0039-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2006] [Accepted: 03/07/2006] [Indexed: 05/11/2023]
Abstract
Salicylic acid (SA) is a plant signalling molecule needed for the induction of defence responses upon attack by a variety of pathogens. Truncation of the Cauliflower Mosaic Virus (CaMV) 35S promoter down to 90 bp has identified activation sequence-1 (as-1) as an autonomous SA-responsive cis element. The as-1-like elements are found in a number of SA-inducible promoters like e.g. the tobacco PR-1a promoter. They are recognized by basic/leucine zipper (bZIP) transcription factors of the TGA family. In tobacco leaves, TGA2.2 is the most abundant TGA factor. TGA2.2 is required for the expression of as-1-containing promoters. Here we unravel clear differences between the "truncated" CaMV 35S and the PR-1a promoter with respect to in vivo TGA binding and histone acetylation. Chromatin immunoprecipitation (ChIP) analysis revealed SA-inducible recruitment of tobacco TGA2.2 as well as SA-inducible histone acetylation at the PR-1a promoter. In contrast, no influence of SA on TGA2.2 binding and histone acetylation was detectable at the "truncated" CaMV 35S promoter. The finding of SA-independent TGA factor binding in the absence of additional flanking regulatory sequences suggests that transcriptional activation is not necessarily mediated by inducible DNA binding of TGA factors. Plants with severely reduced TGA2.2 protein levels also showed SA-induced histone acetylation at the PR-1a promoter indicating that regulatory events independent from TGA2.2 function are initiated at the PR-1a promoter.
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Affiliation(s)
- Thomas Butterbrodt
- Albrecht-von-Haller-Institut fuer Pflanzenwissenschaften, Georg-August-Universitaet Goettingen, Untere Karspuele 2, 37073 Goettingen, Germany
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