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Zhang YM, Guo P, Xia X, Guo H, Li Z. Multiple Layers of Regulation on Leaf Senescence: New Advances and Perspectives. FRONTIERS IN PLANT SCIENCE 2021; 12:788996. [PMID: 34938309 PMCID: PMC8685244 DOI: 10.3389/fpls.2021.788996] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2021] [Accepted: 11/03/2021] [Indexed: 05/22/2023]
Abstract
Leaf senescence is the last stage of leaf development and is an orderly biological process accompanied by degradation of macromolecules and nutrient recycling, which contributes to plant fitness. Forward genetic mutant screening and reverse genetic studies of senescence-associated genes (SAGs) have revealed that leaf senescence is a genetically regulated process, and the initiation and progression of leaf senescence are influenced by an array of internal and external factors. Recently, multi-omics techniques have revealed that leaf senescence is subjected to multiple layers of regulation, including chromatin, transcriptional and post-transcriptional, as well as translational and post-translational levels. Although impressive progress has been made in plant senescence research, especially the identification and functional analysis of a large number of SAGs in crop plants, we still have not unraveled the mystery of plant senescence, and there are some urgent scientific questions in this field, such as when plant senescence is initiated and how senescence signals are transmitted. This paper reviews recent advances in the multiple layers of regulation on leaf senescence, especially in post-transcriptional regulation such as alternative splicing.
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Affiliation(s)
- Yue-Mei Zhang
- National Engineering Laboratory for Tree Breeding, College of Biological Sciences and Technology, Beijing Forestry University, Beijing, China
| | - Pengru Guo
- National Engineering Laboratory for Tree Breeding, College of Biological Sciences and Technology, Beijing Forestry University, Beijing, China
| | - Xinli Xia
- National Engineering Laboratory for Tree Breeding, College of Biological Sciences and Technology, Beijing Forestry University, Beijing, China
| | - Hongwei Guo
- Key Laboratory of Molecular Design for Plant Cell Factory of Guangdong Higher Education Institutes, Department of Biology, Southern University of Science and Technology, Shenzhen, China
| | - Zhonghai Li
- National Engineering Laboratory for Tree Breeding, College of Biological Sciences and Technology, Beijing Forestry University, Beijing, China
- *Correspondence: Zhonghai Li,
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Jung C, Nguyen NH, Cheong JJ. Transcriptional Regulation of Protein Phosphatase 2C Genes to Modulate Abscisic Acid Signaling. Int J Mol Sci 2020; 21:ijms21249517. [PMID: 33327661 PMCID: PMC7765119 DOI: 10.3390/ijms21249517] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2020] [Revised: 12/04/2020] [Accepted: 12/12/2020] [Indexed: 01/04/2023] Open
Abstract
The plant hormone abscisic acid (ABA) triggers cellular tolerance responses to osmotic stress caused by drought and salinity. ABA controls the turgor pressure of guard cells in the plant epidermis, leading to stomatal closure to minimize water loss. However, stomatal apertures open to uptake CO2 for photosynthesis even under stress conditions. ABA modulates its signaling pathway via negative feedback regulation to maintain plant homeostasis. In the nuclei of guard cells, the clade A type 2C protein phosphatases (PP2Cs) counteract SnRK2 kinases by physical interaction, and thereby inhibit activation of the transcription factors that mediate ABA-responsive gene expression. Under osmotic stress conditions, PP2Cs bind to soluble ABA receptors to capture ABA and release active SnRK2s. Thus, PP2Cs function as a switch at the center of the ABA signaling network. ABA induces the expression of genes encoding repressors or activators of PP2C gene transcription. These regulators mediate the conversion of PP2C chromatins from a repressive to an active state for gene transcription. The stress-induced chromatin remodeling states of ABA-responsive genes could be memorized and transmitted to plant progeny; i.e., transgenerational epigenetic inheritance. This review focuses on the mechanism by which PP2C gene transcription modulates ABA signaling.
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Affiliation(s)
- Choonkyun Jung
- Department of International Agricultural Technology and Crop Biotechnology, Institute/Green Bio Science and Technology, Seoul National University, Pyeongchang 25354, Korea;
- Department of Plant Science, College of Agriculture and Life Sciences, Seoul National University, Seoul 08826, Korea
| | - Nguyen Hoai Nguyen
- Faculty of Biotechnology, Ho Chi Minh City Open University, Ho Chi Minh City 700000, Vietnam;
| | - Jong-Joo Cheong
- Center for Food and Bioconvergence, Seoul National University, Seoul 08826, Korea
- Correspondence: ; Tel.: +82-2-880-4888; Fax: +82-2-873-5260
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Wen B, Luo Y, Liu D, Zhang X, Peng Z, Wang K, Li J, Huang J, Liu Z. The R2R3-MYB transcription factor CsMYB73 negatively regulates l-Theanine biosynthesis in tea plants (Camellia sinensis L.). PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2020; 298:110546. [PMID: 32771159 DOI: 10.1016/j.plantsci.2020.110546] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/18/2020] [Revised: 05/08/2020] [Accepted: 06/01/2020] [Indexed: 06/11/2023]
Abstract
l-Theanine, a non-proteinaceous amino acid abundantly present in tea (Camellia sinensis), contributes to the umami flavor of tea and has beneficial effects on human health. While key l-theanine biosynthetic genes have been well documented, their transcriptional regulation remains poorly understood. In this study, we determined the l-theanine contents in tea leaves of two cultivars at three developmental stages and investigated the expression patterns of the l-theanine biosynthetic genes CsGS1 and CsGS2. Additionally, we identified an R2R3-MYB transcription factor, CsMYB73, belonging to subgroup 22 of the R2R3-MYB family. CsMYB73 expression negatively correlated with l-theanine accumulation during leaf maturation. We found that CsMYB73, as a nuclear protein, binds to the promoter regions of CsGS1 and CsGS2 via MYB recognition sequences and represses the transcription of CsGS1 and CsGS2 in tobacco leaves. Collectively, our results demonstrate that CsMYB73 is a transcriptional repressor involved in l-theanine biosynthesis in tea plants. Our findings might contribute to future tea plant breeding strategies.
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Affiliation(s)
- Beibei Wen
- Key Laboratory of Tea Science of Ministry of Education, Hunan Agricultural University, Changsha, Hunan 410128, PR China
| | - Yong Luo
- School of Chemistry, Biology and Environmental Engineering, Xiangnan University, Chenzhou, Hunan 423000, PR China
| | - Dongmin Liu
- Changsha University of Science & Technology, Changsha, Hunan 410114, PR China
| | - Xiangna Zhang
- Key Laboratory of Tea Science of Ministry of Education, Hunan Agricultural University, Changsha, Hunan 410128, PR China
| | - Zhong Peng
- National Research Center of Engineering and Technology for Utilization of Botanical Functional Ingredients & Hunan Co-innovation Center for Utilization of Botanical Functional Ingredients, Hunan Agricultural University, Changsha, Hunan 410128, PR China
| | - Kunbo Wang
- Key Laboratory of Tea Science of Ministry of Education, Hunan Agricultural University, Changsha, Hunan 410128, PR China; National Research Center of Engineering and Technology for Utilization of Botanical Functional Ingredients & Hunan Co-innovation Center for Utilization of Botanical Functional Ingredients, Hunan Agricultural University, Changsha, Hunan 410128, PR China.
| | - Juan Li
- Key Laboratory of Tea Science of Ministry of Education, Hunan Agricultural University, Changsha, Hunan 410128, PR China; National Research Center of Engineering and Technology for Utilization of Botanical Functional Ingredients & Hunan Co-innovation Center for Utilization of Botanical Functional Ingredients, Hunan Agricultural University, Changsha, Hunan 410128, PR China
| | - Jianan Huang
- Key Laboratory of Tea Science of Ministry of Education, Hunan Agricultural University, Changsha, Hunan 410128, PR China; National Research Center of Engineering and Technology for Utilization of Botanical Functional Ingredients & Hunan Co-innovation Center for Utilization of Botanical Functional Ingredients, Hunan Agricultural University, Changsha, Hunan 410128, PR China.
| | - Zhonghua Liu
- Key Laboratory of Tea Science of Ministry of Education, Hunan Agricultural University, Changsha, Hunan 410128, PR China; National Research Center of Engineering and Technology for Utilization of Botanical Functional Ingredients & Hunan Co-innovation Center for Utilization of Botanical Functional Ingredients, Hunan Agricultural University, Changsha, Hunan 410128, PR China.
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Li J, Chen G, Zhang J, Shen H, Kang J, Feng P, Xie Q, Hu Z. Suppression of a hexokinase gene, SlHXK1, leads to accelerated leaf senescence and stunted plant growth in tomato. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2020; 298:110544. [PMID: 32771157 DOI: 10.1016/j.plantsci.2020.110544] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/27/2019] [Revised: 05/19/2020] [Accepted: 05/27/2020] [Indexed: 05/18/2023]
Abstract
Sugars are the key regulatory molecules that impact diverse biological processes in plants. Hexokinase, the key rate-limiting enzyme in hexose metabolism, takes part in the first step of glycolytic pathway. Acting as a sensor that mediates sugar regulation, hexokinase has been proved to play significant roles in regulating plant growth and development. Here, we isolated a hexokinase gene SlHXK1 from tomato. Its transcript levels were higher in flowers and leaves than in other organs and decreased during leaf and petiole development. SlHXK1-RNAi lines displayed advanced leaf senescence and stunted plant growth. Physiological features including plant height, leaf length, thickness and size, the contents of chlorophyll, starch and MDA, and hexokinase activity were dramatically altered in SlHXK1-RNAi plants. Dark-induced leaf senescence were advanced and the transcripts of senescence-related genes after darkness treatment were markedly increased in SlHXK1-RNAi plants. RNA-seq and qRT-PCR analyses showed that the transcripts of genes related to plant hormones, photosynthesis, chloroplast development, chlorophyll synthesis and metabolism, cellular process, starch and sucrose metabolism, and senescence were significantly altered in SlHXK1-RNAi plants. Taken together, our data demonstrate that SlHXK1 is a significant gene involved in leaf senescence and plant growth and development in tomato through affecting starch turnover.
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Affiliation(s)
- Jing Li
- Laboratory of Molecular Biology of Tomato, Bioengineering College, Chongqing University, Chongqing, People's Republic of China.
| | - Guoping Chen
- Laboratory of Molecular Biology of Tomato, Bioengineering College, Chongqing University, Chongqing, People's Republic of China.
| | - Jianling Zhang
- Laboratory of Molecular Biology of Tomato, Bioengineering College, Chongqing University, Chongqing, People's Republic of China.
| | - Hui Shen
- Laboratory of Molecular Biology of Tomato, Bioengineering College, Chongqing University, Chongqing, People's Republic of China.
| | - Jing Kang
- Laboratory of Molecular Biology of Tomato, Bioengineering College, Chongqing University, Chongqing, People's Republic of China.
| | - Panpan Feng
- Laboratory of Molecular Biology of Tomato, Bioengineering College, Chongqing University, Chongqing, People's Republic of China.
| | - Qiaoli Xie
- Laboratory of Molecular Biology of Tomato, Bioengineering College, Chongqing University, Chongqing, People's Republic of China.
| | - Zongli Hu
- Laboratory of Molecular Biology of Tomato, Bioengineering College, Chongqing University, Chongqing, People's Republic of China.
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Bian S, Jin D, Sun G, Shan B, Zhou H, Wang J, Zhai L, Li X. Characterization of the soybean R2R3-MYB transcription factor GmMYB81 and its functional roles under abiotic stresses. Gene 2020; 753:144803. [PMID: 32446917 DOI: 10.1016/j.gene.2020.144803] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2020] [Revised: 05/15/2020] [Accepted: 05/19/2020] [Indexed: 11/20/2022]
Abstract
R2R3-type MYBs are a key group of regulatory factors that control diverse developmental processes and stress tolerance in plants. Soybean is a major legume crop with the richness of seed protein and edible vegetable oil, and 244 R2R3-type MYBs have been identified in soybean. However, the knowledge regarding their functional roles has been greatly limited as yet. In this study, a novel R2R3-type MYB (GmMYB81) was functionally characterized in soybean, and it is closely related to two abiotic stress-associated regulators (AtMYB44 and AtMYB77). GmMYB81 transcripts not only differentially accumulated in soybean tissues and during embryo development, but also were significantly enhanced by drought, salt and cold stress. Histochemical GUS assay in Arabidopsis indicated that GmMYB81 promoter showed high activity in seedlings, rosette leaves, inflorescences, silique wall, mature anthers, roots, and germinating seeds. Further investigation indicated that over-expression of GmMYB81 in Arabidopsis caused auxin-associated phenotypes, including small flower and silique, more branch, and weakened apical dominance. Moreover, over-expression of GmMYB81 significantly elevated the rates of seed germination and green seedling under salt and drought stress, indicating that GmMYB81 might confer plant tolerance to salt and drought stress during seed germination. Additionally, protein interaction analysis showed that GmMYB81 interacts with the abiotic stress regulator GmSGF14l. Further observation indicated that they displayed similar expression patterns under drought and salt stress, suggesting GmMYB81 and GmSGF14l might cooperatively affect stress tolerance. These findings will facilitate future investigations of the regulatory mechanisms of GmMYB81 in response to plant stress tolerance, especially seed germination under abiotic stresses.
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Affiliation(s)
- Shaomin Bian
- College of Plant Science, Jilin University, Changchun 130062, Jilin, China
| | - Donghao Jin
- College of Plant Science, Jilin University, Changchun 130062, Jilin, China
| | - Guoqing Sun
- College of Plant Science, Jilin University, Changchun 130062, Jilin, China
| | - Binghui Shan
- College of Plant Science, Jilin University, Changchun 130062, Jilin, China
| | - Huina Zhou
- National Tobacco Gene Research Center, Zhengzhou Tobacco Research Institute of CNTC, Zhengzhou 450001, Henan, China
| | - Jingying Wang
- College of Plant Science, Jilin University, Changchun 130062, Jilin, China
| | - Lulu Zhai
- College of Plant Science, Jilin University, Changchun 130062, Jilin, China
| | - Xuyan Li
- College of Plant Science, Jilin University, Changchun 130062, Jilin, China.
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Song Q, Lee J, Akter S, Rogers M, Grene R, Li S. Prediction of condition-specific regulatory genes using machine learning. Nucleic Acids Res 2020; 48:e62. [PMID: 32329779 PMCID: PMC7293043 DOI: 10.1093/nar/gkaa264] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2019] [Revised: 02/19/2020] [Accepted: 04/20/2020] [Indexed: 12/31/2022] Open
Abstract
Recent advances in genomic technologies have generated data on large-scale protein-DNA interactions and open chromatin regions for many eukaryotic species. How to identify condition-specific functions of transcription factors using these data has become a major challenge in genomic research. To solve this problem, we have developed a method called ConSReg, which provides a novel approach to integrate regulatory genomic data into predictive machine learning models of key regulatory genes. Using Arabidopsis as a model system, we tested our approach to identify regulatory genes in data sets from single cell gene expression and from abiotic stress treatments. Our results showed that ConSReg accurately predicted transcription factors that regulate differentially expressed genes with an average auROC of 0.84, which is 23.5-25% better than enrichment-based approaches. To further validate the performance of ConSReg, we analyzed an independent data set related to plant nitrogen responses. ConSReg provided better rankings of the correct transcription factors in 61.7% of cases, which is three times better than other plant tools. We applied ConSReg to Arabidopsis single cell RNA-seq data, successfully identifying candidate regulatory genes that control cell wall formation. Our methods provide a new approach to define candidate regulatory genes using integrated genomic data in plants.
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Affiliation(s)
- Qi Song
- Graduate program in Genetics, Bioinformatics and Computational Biology. Virginia Tech., Blacksburg, VA 24061, USA
| | - Jiyoung Lee
- Graduate program in Genetics, Bioinformatics and Computational Biology. Virginia Tech., Blacksburg, VA 24061, USA
| | - Shamima Akter
- School of Plant and Environmental Sciences. Virginia Tech., Blacksburg, VA 24061, USA
| | - Matthew Rogers
- Department of Statistics. Virginia Tech., Blacksburg, VA 24061, USA
| | - Ruth Grene
- Graduate program in Genetics, Bioinformatics and Computational Biology. Virginia Tech., Blacksburg, VA 24061, USA
- School of Plant and Environmental Sciences. Virginia Tech., Blacksburg, VA 24061, USA
| | - Song Li
- Graduate program in Genetics, Bioinformatics and Computational Biology. Virginia Tech., Blacksburg, VA 24061, USA
- School of Plant and Environmental Sciences. Virginia Tech., Blacksburg, VA 24061, USA
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Romera-Branchat M, Severing E, Pocard C, Ohr H, Vincent C, Née G, Martinez-Gallegos R, Jang S, Andrés F, Madrigal P, Coupland G. Functional Divergence of the Arabidopsis Florigen-Interacting bZIP Transcription Factors FD and FDP. Cell Rep 2020; 31:107717. [PMID: 32492426 PMCID: PMC7273178 DOI: 10.1016/j.celrep.2020.107717] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2019] [Revised: 03/10/2020] [Accepted: 05/11/2020] [Indexed: 01/18/2023] Open
Abstract
Flowering of many plant species depends on interactions between basic leucine zipper (bZIP) transcription factors and systemically transported florigen proteins. Members of the genus Arabidopsis contain two of these bZIPs, FD and FDP, which we show have largely complementary expression patterns in shoot apices before and during flowering. CRISPR-Cas9-induced null mutants for FDP flower slightly earlier than wild-type, whereas fd mutants are late flowering. Identical G-box sequences are enriched at FD and FDP binding sites, but only FD binds to genes involved in flowering and only fd alters their transcription. However, both proteins bind to genes involved in responses to the phytohormone abscisic acid (ABA), which controls developmental and stress responses. Many of these genes are differentially expressed in both fd and fdp mutant seedlings, which also show reduced ABA sensitivity. Thus, florigen-interacting bZIPs have distinct functions in flowering dependent on their expression patterns and, at earlier stages in development, play common roles in phytohormone signaling.
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Affiliation(s)
- Maida Romera-Branchat
- Max Planck Institute for Plant Breeding Research, Carl-von-Linné-Weg 10, 50829 Cologne, Germany
| | - Edouard Severing
- Max Planck Institute for Plant Breeding Research, Carl-von-Linné-Weg 10, 50829 Cologne, Germany
| | - Chloé Pocard
- Max Planck Institute for Plant Breeding Research, Carl-von-Linné-Weg 10, 50829 Cologne, Germany
| | - Hyonhwa Ohr
- Max Planck Institute for Plant Breeding Research, Carl-von-Linné-Weg 10, 50829 Cologne, Germany
| | - Coral Vincent
- Max Planck Institute for Plant Breeding Research, Carl-von-Linné-Weg 10, 50829 Cologne, Germany
| | - Guillaume Née
- Institute of Plant Biology and Biotechnology, University of Münster, Schlossplatz 7, 48143 Münster, Germany
| | | | - Seonghoe Jang
- Max Planck Institute for Plant Breeding Research, Carl-von-Linné-Weg 10, 50829 Cologne, Germany
| | - Fernando Andrés
- Max Planck Institute for Plant Breeding Research, Carl-von-Linné-Weg 10, 50829 Cologne, Germany
| | - Pedro Madrigal
- Department of Biometry and Bioinformatics, Institute of Plant Genetics, Polish Academy of Sciences, 60-479 Poznań, Poland
| | - George Coupland
- Max Planck Institute for Plant Breeding Research, Carl-von-Linné-Weg 10, 50829 Cologne, Germany.
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Emami H, Kumar A, Kempken F. Transcriptomic analysis of poco1, a mitochondrial pentatricopeptide repeat protein mutant in Arabidopsis thaliana. BMC PLANT BIOLOGY 2020; 20:209. [PMID: 32397956 PMCID: PMC7216612 DOI: 10.1186/s12870-020-02418-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/29/2019] [Accepted: 04/29/2020] [Indexed: 06/11/2023]
Abstract
BACKGROUND Flowering is a crucial stage during plant development. Plants may respond to unfavorable conditions by accelerating reproductive processes like flowering. In a recent study, we showed that PRECOCIOUS1 (POCO1) is a mitochondrial pentatricopeptide repeat (PPR) protein involved in flowering time and abscisic acid (ABA) signaling in Arabidopsis thaliana. Here, we use RNA-seq data to investigate global gene expression alteration in the poco1 mutant. RESULTS RNA-seq analysis was performed during different developmental stages for wild-type and poco1 plants. The most profound differences in gene expression were found when wild-type and poco1 plants of the same developmental stage were compared. Coverage analysis confirmed the T-DNA insertion in POCO1, which was concomitant with truncated transcripts. Many biological processes were found to be enriched. Several flowering-related genes such as FLOWERING LOCUS T (FT), which may be involved in the early-flowering phenotype of poco1, were differentially regulated. Numerous ABA-associated genes, including the core components of ABA signaling such as ABA receptors, protein phosphatases, protein kinases, and ABA-responsive element (ABRE) binding proteins (AREBs)/ABRE-binding factors (ABFs) as well as important genes for stomatal function, were mostly down-regulated in poco1. Drought and oxidative stress-related genes, including ABA-induced stress genes, were differentially regulated. RNA-seq analysis also uncovered differentially regulated genes encoding various classes of transcription factors and genes involved in cellular signaling. Furthermore, the expression of stress-associated nuclear genes encoding mitochondrial proteins (NGEMPs) was found to be altered in poco1. Redox-related genes were affected, suggesting that the redox state in poco1 might be altered. CONCLUSION The identification of various enriched biological processes indicates that complex regulatory mechanisms underlie poco1 development. Differentially regulated genes associated with flowering may contribute to the early-flowering phenotype of poco1. Our data suggest the involvement of POCO1 in the early ABA signaling process. The down-regulation of many ABA-related genes suggests an association of poco1 mutation with the ABA signaling deficiency. This condition further affects the expression of many stress-related, especially drought-associated genes in poco1, consistent with the drought sensitivity of poco1. poco1 mutation also affects the expression of genes associated with the cellular regulation, redox, and mitochondrial perturbation.
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Affiliation(s)
- Hossein Emami
- Department of Botany, Christian-Albrechts-University, Olshausenstr. 40, 24098, Kiel, Germany
| | - Abhishek Kumar
- Present address: Institute of Bioinformatics, International Technology Park, Bangalore, 560066, India
- Present address: Manipal Academy of Higher Education (MAHE), Manipal, Karnataka, 576104, India
| | - Frank Kempken
- Department of Botany, Christian-Albrechts-University, Olshausenstr. 40, 24098, Kiel, Germany.
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Thabet SG, Moursi YS, Karam MA, Börner A, Alqudah AM. Natural Variation Uncovers Candidate Genes for Barley Spikelet Number and Grain Yield under Drought Stress. Genes (Basel) 2020; 11:genes11050533. [PMID: 32403266 PMCID: PMC7290517 DOI: 10.3390/genes11050533] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2020] [Revised: 04/29/2020] [Accepted: 05/05/2020] [Indexed: 01/01/2023] Open
Abstract
Drought stress can occur at any growth stage and can affect crop productivity, which can result in large yield losses all over the world. In this respect, understanding the genetic architecture of agronomic traits under drought stress is essential for increasing crop yield potential and harvest. Barley is considered the most abiotic stress-tolerant cereal, particularly with respect to drought. In the present study, worldwide spring barley accessions were exposed to drought stress beginning from the early reproductive stage with 35% field capacity under field conditions. Drought stress had significantly reduced the agronomic and yield-related traits such as spike length, awn length, spikelet per spike, grains per spike and thousand kernel weight. To unravel the genetic factors underlying drought tolerance at the early reproductive stage, genome-wide association scan (GWAS) was performed using 121 spring barley accessions and a 9K single nucleotide polymorphisms (SNPs) chip. A total number of 101 significant SNPs, distributed over all seven barley chromosomes, were found to be highly associated with the studied traits, of which five genomic regions were associated with candidate genes at chromosomes 2 and 3. On chromosome 2H, the region between 6469300693-647258342 bp includes two candidate drought-specific genes (HORVU2Hr1G091030 and HORVU2Hr1G091170), which are highly associated with spikelet and final grain number per spike under drought stress conditions. Interestingly, the gene expression profile shows that the candidate genes were highly expressed in spikelet, grain, spike and leaf organs, demonstrating their pivotal role in drought tolerance. To the best of our knowledge, we reported the first detailed study that used GWAS with bioinformatic analyses to define the causative alleles and putative candidate genes underlying grain yield-related traits under field drought conditions in diverse barley germplasm. The identified alleles and candidate genes represent valuable resources for future functional characterization towards the enhancement of barley cultivars for drought tolerance.
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Affiliation(s)
- Samar G. Thabet
- Department of Botany, Faculty of Science, University of Fayoum, Fayoum 63514, Egypt; (S.G.T.); (Y.S.M.); (M.A.K.)
| | - Yasser S. Moursi
- Department of Botany, Faculty of Science, University of Fayoum, Fayoum 63514, Egypt; (S.G.T.); (Y.S.M.); (M.A.K.)
| | - Mohamed A. Karam
- Department of Botany, Faculty of Science, University of Fayoum, Fayoum 63514, Egypt; (S.G.T.); (Y.S.M.); (M.A.K.)
| | - Andreas Börner
- Research Group Resources Genetics and Reproduction, Department Genebank, Leibniz Institute of Plant Genetics and Crop Plant Research, 06466 Seeland OT Gatersleben, Germany;
| | - Ahmad M. Alqudah
- Research Group Resources Genetics and Reproduction, Department Genebank, Leibniz Institute of Plant Genetics and Crop Plant Research, 06466 Seeland OT Gatersleben, Germany;
- Correspondence: or
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60
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Zhang X, Yao Y, Li X, Zhang L, Fan S. Transcriptomic analysis identifies novel genes and pathways for salt stress responses in Suaeda salsa leaves. Sci Rep 2020; 10:4236. [PMID: 32144380 PMCID: PMC7060309 DOI: 10.1038/s41598-020-61204-x] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2019] [Accepted: 02/24/2020] [Indexed: 02/07/2023] Open
Abstract
Salinity is a critical abiotic stress, which significantly impacts the agricultural yield worldwide. Identification of the molecular mechanisms underlying the salt tolerance in euhalophyte Suaeda salsa is conducive to the development of salt-resistant crops. In the present study, high-throughput RNA sequencing was performed after S. salsa leaves were exposed to 300 mM NaCl for 7 days, and 7,753 unigenes were identified as differently expressed genes (DEGs) in S. salsa, including 3,638 increased and 4,115 decreased unigenes. Moreover, hundreds of pathways were predicted to participate in salt stress response in S. salsa by Gene Ontology (GO), MapMan and Kyoto Encyclopedia of Genes and Genomes (KEGG) enrichment analyses, including ion transport and sequestration as well as photoprotection of photosystem (PS) II. The GO enrichment analysis indicated that genes related to ion transport, reactive oxygen species (ROS) scavenging and transcriptional factors were highly expressed upon NaCl treatment. The excessive Na+ and Cl- ions were supposed to be absorbed into the vacuole for ion sequestration and balance adjustment by potassium transporters (such as KEA3) with high expressions. Moreover, we predicted that mutiple candidate genes associated with photosynthesis (such as PSB33 and ABA4), ROS (such as TAU9 and PHI8) and transcriptional regulation (HB-7 and MYB78) pathways could mitigate salt stress-caused damage in S. salsa.
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Affiliation(s)
- Xuejie Zhang
- Key Lab of Plant Stress Research, College of Life Science, Shandong Normal University, Jinan, 250014, Shandong, China
| | - Yan Yao
- Key Lab of Plant Stress Research, College of Life Science, Shandong Normal University, Jinan, 250014, Shandong, China
| | - Xiaotong Li
- Key Lab of Plant Stress Research, College of Life Science, Shandong Normal University, Jinan, 250014, Shandong, China
| | - Luoyan Zhang
- Key Lab of Plant Stress Research, College of Life Science, Shandong Normal University, Jinan, 250014, Shandong, China.
| | - Shoujin Fan
- Key Lab of Plant Stress Research, College of Life Science, Shandong Normal University, Jinan, 250014, Shandong, China.
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Piao W, Sakuraba Y, Paek NC. Transgenic expression of rice MYB102 (OsMYB102) delays leaf senescence and decreases abiotic stress tolerance in Arabidopsis thaliana. BMB Rep 2019. [PMID: 31072449 PMCID: PMC6889895 DOI: 10.5483/bmbrep.2019.52.11.071] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
MYB-type transcription factors (TFs) play important roles in plant growth and development, and in the rapid responses to unfavorable environmental conditions. We recently reported the isolation and characterization of a rice (Oryza sativa) MYB TF, OsMYB102, which is involved in the regulation of leaf senescence by downregulating abscisic acid (ABA) biosynthesis and the downstream signaling response. Based on the similarities of their sequences and expression patterns, OsMYB102 appears to be a homolog of the Arabidopsis thaliana AtMYB44 TF. Since AtMYB44 is a key regulator of leaf senescence and abiotic stress responses, it is important to examine whether AtMYB44 homologs in other plants also act similarly. Here, we generated transgenic Arabidopsis plants expressing OsMYB102 (OsMYB102-OX). The OsMYB102-OX plants showed a delayed senescence phenotype during dark incubation and were more susceptible to salt and drought stresses, considerably similar to Arabidopsis plants overexpressing AtMYB44. Real-time quantitative PCR (RT-qPCR) revealed that, in addition to known senescence-associated genes, genes encoding the ABA catabolic enzymes AtCYP707A3 and AtCYP707A4 were also significantly upregulated in OsMYB102-OX, leading to a significant decrease in ABA accumulation. Furthermore, protoplast transient expression and chromatin immunoprecipitation assays revealed that OsMYB102 directly activated AtCYP707A3 expression. Based on our findings, it is probable that the regulatory functions of AtMYB44 homologs in plants are highly conserved and they have vital roles in leaf senescence and the abiotic stress responses.
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Affiliation(s)
- Weilan Piao
- Department of Plant Science, Plant Genomics and Breeding Institute, and Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul 08826, Korea
| | - Yasuhito Sakuraba
- Department of Plant Science, Plant Genomics and Breeding Institute, and Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul 08826, Korea
- Graduate School of Agricultural and Life Sciences, Biotechnology Research Center, The University of Tokyo, Tokyo 113-8657, Japan
| | - Nam-Chon Paek
- Department of Plant Science, Plant Genomics and Breeding Institute, and Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul 08826, Korea
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Moschen S, Marino J, Nicosia S, Higgins J, Alseekh S, Astigueta F, Bengoa Luoni S, Rivarola M, Fernie AR, Blanchet N, Langlade NB, Paniego N, Fernández P, Heinz RA. Exploring gene networks in two sunflower lines with contrasting leaf senescence phenotype using a system biology approach. BMC PLANT BIOLOGY 2019; 19:446. [PMID: 31651254 PMCID: PMC6813990 DOI: 10.1186/s12870-019-2021-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2019] [Accepted: 09/06/2019] [Indexed: 05/05/2023]
Abstract
BACKGROUND Leaf senescence is a complex process, controlled by multiple genetic and environmental variables. In sunflower, leaf senescence is triggered abruptly following anthesis thereby limiting the capacity of plants to keep their green leaf area during grain filling, which subsequently has a strong impact on crop yield. Recently, we performed a selection of contrasting sunflower inbred lines for the progress of leaf senescence through a physiological, cytological and molecular approach. Here we present a large scale transcriptomic analysis using RNA-seq and its integration with metabolic profiles for two contrasting sunflower inbred lines, R453 and B481-6 (early and delayed senescence respectively), with the aim of identifying metabolic pathways associated to leaf senescence. RESULTS Gene expression profiles revealed a higher number of differentially expressed genes, as well as, higher expression levels in R453, providing evidence for early activation of the senescence program in this line. Metabolic pathways associated with sugars and nutrient recycling were differentially regulated between the lines. Additionally, we identified transcription factors acting as hubs in the co-expression networks; some previously reported as senescence-associated genes in model species but many are novel candidate genes. CONCLUSIONS Understanding the onset and the progress of the senescence process in crops and the identification of these new candidate genes will likely prove highly useful for different management strategies to mitigate the impact of senescence on crop yield. Functional characterization of candidate genes will help to develop molecular tools for biotechnological applications in breeding crop yield.
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Affiliation(s)
- Sebastián Moschen
- Estación Experimental Agropecuaria Famaillá, Instituto Nacional de Tecnología Agropecuaria, Famaillá, Tucumán Argentina
- Instituto de Agrobiotecnología y Biología Molecular – IABiMo – INTA-CONICET, Instituto de Biotecnología, Centro de Investigaciones en Ciencias Veterinarias y Agronómicas, Instituto Nacional de Tecnología Agropecuaria, Hurlingham, Argentina
- Consejo Nacional de Investigaciones Científicas y Técnicas, Ciudad Autónoma de Buenos Aires, Argentina
| | - Johanna Marino
- Escuela de Ciencia y Tecnología, Universidad Nacional de San Martín, San Martín, Argentina
| | - Salvador Nicosia
- Instituto de Agrobiotecnología y Biología Molecular – IABiMo – INTA-CONICET, Instituto de Biotecnología, Centro de Investigaciones en Ciencias Veterinarias y Agronómicas, Instituto Nacional de Tecnología Agropecuaria, Hurlingham, Argentina
- Consejo Nacional de Investigaciones Científicas y Técnicas, Ciudad Autónoma de Buenos Aires, Argentina
| | - Janet Higgins
- Earlham Institute, Norwich Research Park, Norwich, NR4 7UZ UK
| | - Saleh Alseekh
- Max-Planck-Institut für Molekulare Pflanzenphysiologie, Potsdam-Golm, Germany
| | - Francisco Astigueta
- Instituto de Agrobiotecnología y Biología Molecular – IABiMo – INTA-CONICET, Instituto de Biotecnología, Centro de Investigaciones en Ciencias Veterinarias y Agronómicas, Instituto Nacional de Tecnología Agropecuaria, Hurlingham, Argentina
- Consejo Nacional de Investigaciones Científicas y Técnicas, Ciudad Autónoma de Buenos Aires, Argentina
| | - Sofia Bengoa Luoni
- Instituto Tecnológico Chascomús (INTECh), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)-Universidad Nacional de General San Martín (UNSAM), Chascomús, Argentina
| | - Máximo Rivarola
- Instituto de Agrobiotecnología y Biología Molecular – IABiMo – INTA-CONICET, Instituto de Biotecnología, Centro de Investigaciones en Ciencias Veterinarias y Agronómicas, Instituto Nacional de Tecnología Agropecuaria, Hurlingham, Argentina
- Consejo Nacional de Investigaciones Científicas y Técnicas, Ciudad Autónoma de Buenos Aires, Argentina
| | - Alisdair R. Fernie
- Max-Planck-Institut für Molekulare Pflanzenphysiologie, Potsdam-Golm, Germany
| | - Nicolas Blanchet
- LIPM, INRA, CNRS, Université de Toulouse, Castanet-Tolosan, France
| | | | - Norma Paniego
- Instituto de Agrobiotecnología y Biología Molecular – IABiMo – INTA-CONICET, Instituto de Biotecnología, Centro de Investigaciones en Ciencias Veterinarias y Agronómicas, Instituto Nacional de Tecnología Agropecuaria, Hurlingham, Argentina
- Consejo Nacional de Investigaciones Científicas y Técnicas, Ciudad Autónoma de Buenos Aires, Argentina
| | - Paula Fernández
- Instituto de Agrobiotecnología y Biología Molecular – IABiMo – INTA-CONICET, Instituto de Biotecnología, Centro de Investigaciones en Ciencias Veterinarias y Agronómicas, Instituto Nacional de Tecnología Agropecuaria, Hurlingham, Argentina
- Consejo Nacional de Investigaciones Científicas y Técnicas, Ciudad Autónoma de Buenos Aires, Argentina
- Escuela de Ciencia y Tecnología, Universidad Nacional de San Martín, San Martín, Argentina
| | - Ruth A. Heinz
- Instituto de Agrobiotecnología y Biología Molecular – IABiMo – INTA-CONICET, Instituto de Biotecnología, Centro de Investigaciones en Ciencias Veterinarias y Agronómicas, Instituto Nacional de Tecnología Agropecuaria, Hurlingham, Argentina
- Consejo Nacional de Investigaciones Científicas y Técnicas, Ciudad Autónoma de Buenos Aires, Argentina
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63
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Bengoa Luoni S, Astigueta FH, Nicosia S, Moschen S, Fernandez P, Heinz R. Transcription Factors Associated with Leaf Senescence in Crops. PLANTS (BASEL, SWITZERLAND) 2019; 8:E411. [PMID: 31614987 PMCID: PMC6843677 DOI: 10.3390/plants8100411] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/01/2019] [Revised: 08/21/2019] [Accepted: 08/23/2019] [Indexed: 12/13/2022]
Abstract
Leaf senescence is a complex mechanism controlled by multiple genetic and environmental variables. Different crops present a delay in leaf senescence with an important impact on grain yield trough the maintenance of the photosynthetic leaf area during the reproductive stage. Additionally, because of the temporal gap between the onset and phenotypic detection of the senescence process, candidate genes are key tools to enable the early detection of this process. In this sense and given the importance of some transcription factors as hub genes in senescence pathways, we present a comprehensive review on senescence-associated transcription factors, in model plant species and in agronomic relevant crops. This review will contribute to the knowledge of leaf senescence process in crops, thus providing a valuable tool to assist molecular crop breeding.
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Affiliation(s)
- Sofia Bengoa Luoni
- Consejo Nacional de Investigaciones Científicas y Técnicas, Ciudad Autónoma de Buenos Aires 1425, Argentina.
| | - Francisco H Astigueta
- Consejo Nacional de Investigaciones Científicas y Técnicas, Ciudad Autónoma de Buenos Aires 1425, Argentina.
- Escuela de Ciencia y Tecnología, Universidad Nacional de San Martín, San Martín, Buenos Aires 1650, Argentina.
| | - Salvador Nicosia
- Consejo Nacional de Investigaciones Científicas y Técnicas, Ciudad Autónoma de Buenos Aires 1425, Argentina.
- Universidad Nacional de Lujan, Cruce Rutas Nac. 5 y 7, Lujan, Buenos Aires 6700, Argentina.
| | - Sebastian Moschen
- Consejo Nacional de Investigaciones Científicas y Técnicas, Ciudad Autónoma de Buenos Aires 1425, Argentina.
- Instituto Nacional de Tecnología Agropecuaria, Estación Experimental Agropecuaria Famaillá, Tucumán 4142, Argentina.
| | - Paula Fernandez
- Consejo Nacional de Investigaciones Científicas y Técnicas, Ciudad Autónoma de Buenos Aires 1425, Argentina.
- Escuela de Ciencia y Tecnología, Universidad Nacional de San Martín, San Martín, Buenos Aires 1650, Argentina.
- Instituto de Agrobiotecnología y Biología Molecular (INTA-CONICET), Instituto de Biotecnología, Centro de Investigaciones en Ciencias Agronómicas y Veterinarias, Instituto Nacional de Tecnología Agropecuaria, Hurlingham, Buenos Aires 1686, Argentina.
| | - Ruth Heinz
- Consejo Nacional de Investigaciones Científicas y Técnicas, Ciudad Autónoma de Buenos Aires 1425, Argentina.
- Instituto de Agrobiotecnología y Biología Molecular (INTA-CONICET), Instituto de Biotecnología, Centro de Investigaciones en Ciencias Agronómicas y Veterinarias, Instituto Nacional de Tecnología Agropecuaria, Hurlingham, Buenos Aires 1686, Argentina.
- Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Autónoma de Buenos Aires 1428, Argentina.
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Piao W, Kim SH, Lee BD, An G, Sakuraba Y, Paek NC. Rice transcription factor OsMYB102 delays leaf senescence by down-regulating abscisic acid accumulation and signaling. JOURNAL OF EXPERIMENTAL BOTANY 2019; 70:2699-2715. [PMID: 30825376 PMCID: PMC6506775 DOI: 10.1093/jxb/erz095] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2018] [Accepted: 02/18/2019] [Indexed: 05/21/2023]
Abstract
MYB-type transcription factors (TFs) play important roles in plant growth and development, and in the responses to several abiotic stresses. In rice (Oryza sativa), the roles of MYB-related TFs in leaf senescence are not well documented. Here, we examined rice MYB TF gene OsMYB102 and found that an OsMYB102 T-DNA activation-tagged line (termed osmyb102-D), which constitutively expresses OsMYB102 under the control of four tandem repeats of the 35S promoter, and OsMYB102-overexpressing transgenic lines (35S:OsMYB102 and 35S:GFP-OsMYB102) maintain green leaves much longer than the wild-type under natural, dark-induced, and abscisic acid (ABA)-induced senescence conditions. Moreover, an osmyb102 knockout mutant showed an accelerated senescence phenotype under dark-induced and ABA-induced leaf senescence conditions. Microarray analysis showed that a variety of senescence-associated genes (SAGs) were down-regulated in the osmyb102-D line. Further studies demonstrated that overexpression of OsMYB102 controls the expression of SAGs, including genes associated with ABA degradation and ABA signaling (OsABF4, OsNAP, and OsCYP707A6), under dark-induced senescence conditions. OsMYB102 inhibits ABA accumulation by directly activating the transcription of OsCYP707A6, which encodes the ABA catabolic enzyme ABSCISIC ACID 8'-HYDROXYLASE. OsMYB102 also indirectly represses ABA-responsive genes, such as OsABF4 and OsNAP. Collectively, these results demonstrate that OsMYB102 plays a critical role in leaf senescence by down-regulating ABA accumulation and ABA signaling responses.
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Affiliation(s)
- Weilan Piao
- Department of Plant Science, Plant Genomics and Breeding Institute, Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul, Republic of Korea
| | - Suk-Hwan Kim
- Department of Plant Science, Plant Genomics and Breeding Institute, Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul, Republic of Korea
| | - Byoung-Doo Lee
- Department of Plant Science, Plant Genomics and Breeding Institute, Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul, Republic of Korea
| | - Gynheung An
- Department of Plant Molecular Systems Biotechnology, Crop Biotech Institute, Kyung Hee University, Yongin, Republic of Korea
| | - Yasuhito Sakuraba
- Department of Plant Science, Plant Genomics and Breeding Institute, Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul, Republic of Korea
- Present address: Graduate School of Agricultural and Life Sciences, Biotechnology Research Center, The University of Tokyo, Tokyo 113–8657, Japan
| | - Nam-Chon Paek
- Department of Plant Science, Plant Genomics and Breeding Institute, Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul, Republic of Korea
- Correspondence: or
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65
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AtMYB44 suppresses transcription of the late embryogenesis abundant protein gene AtLEA4-5. Biochem Biophys Res Commun 2019; 511:931-934. [DOI: 10.1016/j.bbrc.2019.03.006] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2019] [Accepted: 03/01/2019] [Indexed: 12/28/2022]
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Gu L, Dou L, Guo Y, Wang H, Li L, Wang C, Ma L, Wei H, Yu S. The WRKY transcription factor GhWRKY27 coordinates the senescence regulatory pathway in upland cotton (Gossypium hirsutum L.). BMC PLANT BIOLOGY 2019; 19:116. [PMID: 30922232 PMCID: PMC6440019 DOI: 10.1186/s12870-019-1688-z] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2018] [Accepted: 02/19/2019] [Indexed: 05/20/2023]
Abstract
BACKGROUND Premature senescence can reduce the yield and quality of crops. WRKY transcription factors (TFs) play important roles during leaf senescence, but little is known about their ageing mechanisms in cotton. RESULTS In this study, a group III WRKY TF, GhWRKY27, was isolated and characterized. The expression of GhWRKY27 was induced by leaf senescence and was higher in an early-ageing cotton variety than in a non-early-ageing cotton variety. Overexpression of GhWRKY27 in Arabidopsis promoted leaf senescence, as determined by reduced chlorophyll content and elevated expression of senescence-associated genes (SAGs). Yeast two-hybrid (Y2H) and bimolecular fluorescence complementation (BiFC) assays showed that GhWRKY27 interacted with an MYB TF, GhTT2. Putative target genes of GhWRKY27 were identified via chromatin immunoprecipitation followed by sequencing (ChIP-seq). Yeast one-hybrid (Y1H) assay and electrophoretic mobility shift assay (EMSA) revealed that GhWRKY27 binds directly to the promoters of cytochrome P450 94C1 (GhCYP94C1) and ripening-related protein 2 (GhRipen2-2). In addition, the expression patterns of GhTT2, GhCYP94C1 and GhRipen2-2 were identified during leaf senescence. Transient dual-luciferase reporter assay indicated that GhWRKY27 could activate the expression of GhCYP94C1 and GhRipen2-2. CONCLUSIONS Our work lays the foundation for further study of the functional roles of WRKY genes during leaf senescence in cotton. In addition, our data provide new insights into the senescence-associated mechanisms of WRKY genes in cotton.
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Affiliation(s)
- Lijiao Gu
- State Key Laboratory of Cotton Biology, Cotton Research Institute, Chinese Academy of Agricultural Sciences, Anyang, 455000 China
| | - Lingling Dou
- State Key Laboratory of Cotton Biology, Cotton Research Institute, Chinese Academy of Agricultural Sciences, Anyang, 455000 China
| | - Yaning Guo
- State Key Laboratory of Cotton Biology, Cotton Research Institute, Chinese Academy of Agricultural Sciences, Anyang, 455000 China
| | - Hantao Wang
- State Key Laboratory of Cotton Biology, Cotton Research Institute, Chinese Academy of Agricultural Sciences, Anyang, 455000 China
| | - Libei Li
- State Key Laboratory of Cotton Biology, Cotton Research Institute, Chinese Academy of Agricultural Sciences, Anyang, 455000 China
| | - Congcong Wang
- State Key Laboratory of Cotton Biology, Cotton Research Institute, Chinese Academy of Agricultural Sciences, Anyang, 455000 China
| | - Liang Ma
- State Key Laboratory of Cotton Biology, Cotton Research Institute, Chinese Academy of Agricultural Sciences, Anyang, 455000 China
| | - Hengling Wei
- State Key Laboratory of Cotton Biology, Cotton Research Institute, Chinese Academy of Agricultural Sciences, Anyang, 455000 China
| | - Shuxun Yu
- State Key Laboratory of Cotton Biology, Cotton Research Institute, Chinese Academy of Agricultural Sciences, Anyang, 455000 China
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Asad MAU, Zakari SA, Zhao Q, Zhou L, Ye Y, Cheng F. Abiotic Stresses Intervene with ABA Signaling to Induce Destructive Metabolic Pathways Leading to Death: Premature Leaf Senescence in Plants. Int J Mol Sci 2019; 20:E256. [PMID: 30634648 PMCID: PMC6359161 DOI: 10.3390/ijms20020256] [Citation(s) in RCA: 46] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2018] [Revised: 12/27/2018] [Accepted: 12/28/2018] [Indexed: 12/19/2022] Open
Abstract
Abiotic stresses trigger premature leaf senescence by affecting some endogenous factors, which is an important limitation for plant growth and grain yield. Among these endogenous factors that regulate leaf senescence, abscisic acid (ABA) works as a link between the oxidase damage of cellular structure and signal molecules responding to abiotic stress during leaf senescence. Considering the importance of ABA, we collect the latest findings related to ABA biosynthesis, ABA signaling, and its inhibitory effect on chloroplast structure destruction, chlorophyll (Chl) degradation, and photosynthesis reduction. Post-translational changes in leaf senescence end with the exhaustion of nutrients, yellowing of leaves, and death of senescent tissues. In this article, we review the literature on the ABA-inducing leaf senescence mechanism in rice and Arabidopsis starting from ABA synthesis, transport, signaling receptors, and catabolism. We also predict the future outcomes of investigations related to other plants. Before changes in translation occur, ABA signaling that mediates the expression of NYC, bZIP, and WRKY transcription factors (TFs) has been investigated to explain the inducing effect on senescence-associated genes. Various factors related to calcium signaling, reactive oxygen species (ROS) production, and protein degradation are elaborated, and research gaps and potential prospects are presented. Examples of gene mutation conferring the delay or induction of leaf senescence are also described, and they may be helpful in understanding the inhibitory effect of abiotic stresses and effective measures to tolerate, minimize, or resist their inducing effect on leaf senescence.
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Affiliation(s)
- Muhammad Asad Ullah Asad
- Institute of Crop Science, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou 310058, China.
| | - Shamsu Ado Zakari
- Institute of Crop Science, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou 310058, China.
| | - Qian Zhao
- Institute of Crop Science, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou 310058, China.
| | - Lujian Zhou
- Institute of Crop Science, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou 310058, China.
| | - Yu Ye
- Institute of Crop Science, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou 310058, China.
| | - Fangmin Cheng
- Institute of Crop Science, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou 310058, China.
- Jiangsu Collaborative Innovation Centre for Modern Crop Production, Nanjing 210000, China.
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68
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Mia MS, Liu H, Wang X, Yan G. Multiple Near-Isogenic Lines Targeting a QTL Hotspot of Drought Tolerance Showed Contrasting Performance Under Post-anthesis Water Stress. FRONTIERS IN PLANT SCIENCE 2019; 10:271. [PMID: 30906308 PMCID: PMC6418346 DOI: 10.3389/fpls.2019.00271] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2018] [Accepted: 02/19/2019] [Indexed: 05/05/2023]
Abstract
The complex quantitative nature of drought-related traits is a major constraint to breed tolerant wheat varieties. Pairs of near-isogenic lines (NILs) with a common genetic background but differing in a particular locus could turn quantitative traits into a Mendelian factor facilitating our understanding of genotype and phenotype interactions. In this study, we report our fast track development and evaluation of NILs from C306 × Dharwar Dry targeting a wheat 4BS QTL hotspot in C306, which confers drought tolerance following the heterogeneous inbreed family (HIF) analysis coupled with immature embryo culture-based fast generation technique. Molecular marker screening and phenotyping for grain yield and related traits under post-anthesis water stress (WS) confirmed four isoline pairs, viz., qDSI.4B.1-2, qDSI.4B.1-3, qDSI.4B.1-6, and qDSI.4B.1-8. There were significant contrasts of responses between the NILs with C306 QTL (+NILs) and the NILs without C306 QTL (-NILs). Among the four confirmed NIL pairs, mean grain yield per plant of the +NILs and -NILs showed significant differences ranging from 9.61 to 10.81 and 6.30 to 7.56 g, respectively, under WS condition, whereas a similar grain yield was recorded between the +NILs and -NILs under well-watered condition. Isolines of +NIL and -NIL pairs showed similar chlorophyll content (SPAD), assimilation rate (A), and transpiration rate (Tr) at the beginning of the stress. However, the +NILs showed significantly higher SPAD (12%), A (66%), stomatal conductance (75%), and Tr (97%) than the -NILs at the seventh day of stress. Quantitative RT-PCR analysis targeting the MYB transcription factor gene Triticum aestivum MYB 82 (TaMYB82), within this genomic region which was retrieved from the wheat reference genome TGACv1, also revealed differential expression in +NILs and -NILs under stress. These results confirmed that the NILs can be invaluable resources for fine mapping of this QTL, and also for cloning and functional characterization of the gene(s) responsible for drought tolerance in wheat.
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Affiliation(s)
- Md Sultan Mia
- School of Agriculture and Environment, Faculty of Science, The University of Western Australia, Perth, WA, Australia
- The UWA Institute of Agriculture, The University of Western Australia, Perth, WA, Australia
- Plant Breeding Division, Bangladesh Agricultural Research Institute, Gazipur, Bangladesh
| | - Hui Liu
- School of Agriculture and Environment, Faculty of Science, The University of Western Australia, Perth, WA, Australia
- The UWA Institute of Agriculture, The University of Western Australia, Perth, WA, Australia
| | - Xingyi Wang
- School of Agriculture and Environment, Faculty of Science, The University of Western Australia, Perth, WA, Australia
- The UWA Institute of Agriculture, The University of Western Australia, Perth, WA, Australia
| | - Guijun Yan
- School of Agriculture and Environment, Faculty of Science, The University of Western Australia, Perth, WA, Australia
- The UWA Institute of Agriculture, The University of Western Australia, Perth, WA, Australia
- *Correspondence: Guijun Yan,
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AtMYB44 interacts with TOPLESS-RELATED corepressors to suppress protein phosphatase 2C gene transcription. Biochem Biophys Res Commun 2018; 507:437-442. [PMID: 30448055 DOI: 10.1016/j.bbrc.2018.11.057] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2018] [Accepted: 11/10/2018] [Indexed: 11/21/2022]
Abstract
AtMYB44 has been described in diverse hormonal signaling processes including abscisic acid (ABA)-mediated tolerance to abiotic stress; however, its function as a transcription factor is controversial. AtMYB44 contains the amino acid sequence LSLSL, a putative ETHYLENE-RESPONSIVE ELEMENT BINDING FACTOR-ASSOCIATED AMPHIPHILIC REPRESSION (EAR) motif. In yeast two-hybrid assay, physical interaction between AtMYB44 and a TOPLESS-RELATED (TPR) corepressor was observed, but abolished by mutation of the EAR motif. We performed bimolecular fluorescence complementation assay to confirm their interaction in planta. Chromatin immunoprecipitation assay revealed binding of AtMYB44 to the promoter regions of clade A protein phosphatase 2C (PP2C) genes (e.g., ABI1, ABI2, and HAI1), implying putative targets. Levels of histone H3 acetylation around the promoter regions were markedly lower in AtMYB44-overexpressing (35S:AtMYB44) plants than in wild-type plants. These results suggest that AtMYB44 forms a complex with TPR corepressors and recruits histone deacetylase(s) to suppress PP2C gene transcription in a signal-independent manner.
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Xue J, Li T, Wang S, Xue Y, Hu F, Zhang X. Elucidation of the mechanism of reflowering in tree peony (Paeonia suffruticosa) 'Zi Luo Lan' by defoliation and gibberellic acid application. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2018; 132:571-578. [PMID: 30326436 DOI: 10.1016/j.plaphy.2018.10.004] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2018] [Revised: 09/03/2018] [Accepted: 10/06/2018] [Indexed: 05/06/2023]
Abstract
In this study, the reflowering mechanism of tree peony (Paeonia suffruticosa 'Zi Luo Lan') after defoliation and gibberellic acid (GA) application (autumn-flowering treatment) was investigated by monitoring the morphological changes, measuring the endogenous GA3 and abscisic acid (ABA) contents, and determining the expression patterns of six GA- and two ABA-related genes. The results show that autumn-flowering treatment induced tree peony reflowering in autumn, which was accompanied by nutrient absorption in buds. The application of exogenous GA3 induced a simultaneous increase in GA3 and decrease in ABA levels, suggesting that the high ratios of GA3/ABA may play a key role in inducing tree peony reflowering. RT-qPCR analysis shows that PsCPS and PsGA2ox were significantly induced and inhibited by GA3 application, respectively, which supports the hypothesis that GA3 treatment induces endogenous GA3 production. In addition, GA3 treatment inhibited the expression of the PsGID1c, but its effect on PsGAI1 was limited, whereas the expression of PsGAMYB could be GA- or ABA-related. Furthermore, autumn-flowering treatment significantly inhibited the expression of PsNCED and PsbZIP, which coincides with the observed changes in ABA levels. Therefore, we postulate that autumn-flowering treatment induces tree peony reflowering by inhibiting the function of ABA accumulation and signaling.
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Affiliation(s)
- Jingqi Xue
- Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, China; Department of Peony, Chinese Academy of Agricultural Sciences, China; Key Laboratory of Biology and Genetic Improvement of Horticultural Crops, Ministry of Agriculture and Rural Affairs, Beijing, 100081, China
| | - Tingting Li
- Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, China; Department of Peony, Chinese Academy of Agricultural Sciences, China; Key Laboratory of Biology and Genetic Improvement of Horticultural Crops, Ministry of Agriculture and Rural Affairs, Beijing, 100081, China; Institute of Landscape Architecture, Nanjing Forestry University, Nanjing, 210037, China
| | - Shunli Wang
- Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, China; Department of Peony, Chinese Academy of Agricultural Sciences, China; Key Laboratory of Biology and Genetic Improvement of Horticultural Crops, Ministry of Agriculture and Rural Affairs, Beijing, 100081, China
| | - Yuqian Xue
- Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, China; Department of Peony, Chinese Academy of Agricultural Sciences, China; Key Laboratory of Biology and Genetic Improvement of Horticultural Crops, Ministry of Agriculture and Rural Affairs, Beijing, 100081, China
| | - Fengrong Hu
- Institute of Landscape Architecture, Nanjing Forestry University, Nanjing, 210037, China.
| | - Xiuxin Zhang
- Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, China; Department of Peony, Chinese Academy of Agricultural Sciences, China; Key Laboratory of Biology and Genetic Improvement of Horticultural Crops, Ministry of Agriculture and Rural Affairs, Beijing, 100081, China.
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71
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Lenka SK, Muthusamy SK, Chinnusamy V, Bansal KC. Ectopic Expression of Rice PYL3 Enhances Cold and Drought Tolerance in Arabidopsis thaliana. Mol Biotechnol 2018; 60:350-361. [PMID: 29574592 DOI: 10.1007/s12033-018-0076-5] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Abscisic acid (ABA) plays an important role in plant development and adaptation to abiotic stresses. The pyrabactin resistance-like (PYL) gene family has been characterized as intracellular ABA receptors in Arabidopsis. We describe here the functional characterization of PYL3 ABA receptor from a drought-tolerant rice landrace Nagina 22 (N22). The induced expression level of the PYL3 transcript was observed in the N22 under different stress treatments, including cold, drought, high temperature, salt and ABA. In contrast, the expression of PYL3 was down-regulated in drought-susceptible rice cv. IR64 in response to above stresses. C-terminal GFP translational fusion of OsPYL3 was localized to both cytosol and nucleus explaining in part functional conservation of PYL protein as ABA receptor. Arabidopsis transgenic lines overexpressing OsPYL3 were hypersensitive to ABA suggesting ABA signaling pathway-dependent molecular response of the OsPYL3. Further, constitutive overexpression of OsPYL3 in Arabidopsis led to improved cold and drought stress tolerance. Thus, OsPYL3 identified in this study could be a good candidate for genetic improvement of cold and drought stress tolerance of rice and other crop plants.
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Affiliation(s)
- Sangram K Lenka
- ICAR-National Research Centre on Plant Biotechnology, Indian Agricultural Research Institute, New Delhi, 110012, India.,TERI-Deakin NanoBiotechnology Centre, The Energy and Resources Institute, New Delhi, 110003, India
| | - Senthilkumar K Muthusamy
- ICAR-National Research Centre on Plant Biotechnology, Indian Agricultural Research Institute, New Delhi, 110012, India.,ICAR-Central Tuber Crops Research Institute, Thiruvananthapuram, 695017, India
| | - Viswanathan Chinnusamy
- Division of Plant Physiology, ICAR-Indian Agricultural Research Institute, New Delhi, 110012, India
| | - Kailash C Bansal
- ICAR-National Research Centre on Plant Biotechnology, Indian Agricultural Research Institute, New Delhi, 110012, India. .,TERI-Deakin NanoBiotechnology Centre, The Energy and Resources Institute, New Delhi, 110003, India.
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72
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Wei L, Mao W, Jia M, Xing S, Ali U, Zhao Y, Chen Y, Cao M, Dai Z, Zhang K, Dou Z, Jia W, Li B. FaMYB44.2, a transcriptional repressor, negatively regulates sucrose accumulation in strawberry receptacles through interplay with FaMYB10. JOURNAL OF EXPERIMENTAL BOTANY 2018; 69:4805-4820. [PMID: 30085079 PMCID: PMC6137983 DOI: 10.1093/jxb/ery249] [Citation(s) in RCA: 56] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2018] [Accepted: 07/18/2018] [Indexed: 05/09/2023]
Abstract
Sugar and acid metabolism are critical for fruit ripening and quality formation, but the underlying regulatory mechanisms are largely unknown. Here, we identified a transcriptional repressor, FaMYB44.2, that regulates sugar and acid accumulation in strawberry (Fragaria × ananassa 'Benihoppe') receptacles. We transiently expressed FaMYB44.2 in strawberry fruit and conducted metabolic and molecular analyses to explore the role of FaMYB44.2 in sugar and acid accumulation in strawberry. We found that FaMYB44.2 negatively regulates soluble sugar accumulation and malic acid content and represses the expression of numerous structural genes, including FaSPS3, a key gene in sucrose accumulation. From the white fruit stage onwards, the repressive effect of FaMYB44.2 on FaSPS3 is reversed by FaMYB10, which positively regulates anthocyanin accumulation. Our results indicate that FaMYB10 suppresses FaMYB44.2 expression; weakens the interaction between FaMYB44.2 and its co-repressor, FabHLH3; and cooperates with FabHLH3 to activate the expression of FaSPS3. The interplay between FaMYB10 and FaMYB44.2 results in sucrose accumulation in ripe strawberry fruits. In addition, the repressive effect of FaMYB44.2 on sucrose accumulation is enhanced by jasmonic acid. This study provides new insights into the regulatory mechanisms of sucrose accumulation and sheds light on the interplay between regulatory proteins during strawberry fruit ripening and quality formation.
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Affiliation(s)
- Lingzhi Wei
- College of Horticulture, China Agricultural University, Beijing, China
| | - Wenwen Mao
- College of Horticulture, China Agricultural University, Beijing, China
| | - Meiru Jia
- College of Horticulture, China Agricultural University, Beijing, China
| | - Sinian Xing
- College of Horticulture, China Agricultural University, Beijing, China
| | - Usman Ali
- College of Horticulture, China Agricultural University, Beijing, China
| | - Yaoyao Zhao
- College of Horticulture, China Agricultural University, Beijing, China
| | - Yating Chen
- College of Horticulture, China Agricultural University, Beijing, China
| | - Minglin Cao
- College of Horticulture, China Agricultural University, Beijing, China
| | - Zhengrong Dai
- College of Horticulture, China Agricultural University, Beijing, China
| | - Kai Zhang
- College of Horticulture, China Agricultural University, Beijing, China
| | - Zhechao Dou
- College of Horticulture, China Agricultural University, Beijing, China
| | - Wensuo Jia
- College of Horticulture, China Agricultural University, Beijing, China
| | - Bingbing Li
- College of Horticulture, China Agricultural University, Beijing, China
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73
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Wang WL, Cui X, Wang YX, Liu ZW, Zhuang J. Members of R2R3-type MYB transcription factors from subgroups 20 and 22 are involved in abiotic stress response in tea plants. BIOTECHNOL BIOTEC EQ 2018. [DOI: 10.1080/13102818.2018.1512898] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022] Open
Affiliation(s)
- Wen-Li Wang
- Tea Science Research Institute, College of Horticulture, Nanjing Agricultural University, Nanjing, China
| | - Xin Cui
- Tea Science Research Institute, College of Horticulture, Nanjing Agricultural University, Nanjing, China
| | - Yong-Xin Wang
- Tea Science Research Institute, College of Horticulture, Nanjing Agricultural University, Nanjing, China
| | - Zhi-Wei Liu
- Tea Science Research Institute, College of Horticulture, Nanjing Agricultural University, Nanjing, China
| | - Jing Zhuang
- Tea Science Research Institute, College of Horticulture, Nanjing Agricultural University, Nanjing, China
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74
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Chao Y, Xie L, Yuan J, Guo T, Li Y, Liu F, Han L. Transcriptome analysis of leaf senescence in red clover ( Trifolium pratense L.). PHYSIOLOGY AND MOLECULAR BIOLOGY OF PLANTS : AN INTERNATIONAL JOURNAL OF FUNCTIONAL PLANT BIOLOGY 2018; 24:753-765. [PMID: 30150852 PMCID: PMC6103954 DOI: 10.1007/s12298-018-0562-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2017] [Revised: 03/24/2018] [Accepted: 05/22/2018] [Indexed: 05/28/2023]
Abstract
Red clover (Trifolium pratense L.) is an important cool-season legume plant, which is used as forage. Leaf senescence is a critical developmental process that negatively affects plant quality and yield. The regulatory mechanism of leaf senescence has been studied, and genes involved in leaf senescence have been cloned and characterized in many plants. However, those works mainly focused on model plants. Information about regulatory pathways and the genes involved in leaf senescence in red clover is very sparse. In this study, to better understand leaf senescence in red clover, transcriptome analysis of mature and senescent leaves was investigated using RNA-Seq. A total of about 35,067 genes were identified, and 481 genes were differentially expressed in mature and senescent leaves. Some identified differentially expressed genes showed similar expression patterns as those involved in leaf senescence in other species, such as Arabidopsis, Medicago truncatula and rice. Differentially expressed genes were confirmed by quantitative real-time PCR (qRT-PCR). Genes involved in signal transduction, transportation and metabolism of plant hormones, transcription factors and plant senescence were upregulated, while the downregulated genes were primarily involved in nutrient cycling, lipid/carbohydrate metabolism, hormone response and other processes. There were 64 differentially expressed transcription factor genes identified by RNA-Seq, including ERF, WRKY, bHLH, MYB and NAC. A total of 90 genes involved in biosynthesis, metabolism and transduction of plant hormones, including abscisic acid, jasmonic acid, cyokinin, brassinosteroid, salicylic acid and ethylene, were identified. Furthermore, 207 genes with direct roles in leaf senescence were demonstrated, such as senescence-associated genes. These genes were associated with senescence in other plants. Transcriptome analysis of mature and senescent leaves in red clover provides a large number of differentially expressed genes. Further analysis and identification of senescence-associated genes can provide new insight into the regulatory mechanisms of leaf development and senescence in legume plant and red clover.
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Affiliation(s)
- Yuehui Chao
- Turfgrass Research Institute, College of Forestry, Beijing Forestry University, Beijing, 100083 China
| | - Lijuan Xie
- School of Applied Chemistry and Biotechnology, Shenzhen Polytechnic, Shenzhen, 518055 China
| | - Jianbo Yuan
- Turfgrass Research Institute, College of Forestry, Beijing Forestry University, Beijing, 100083 China
| | - Tao Guo
- Turfgrass Research Institute, College of Forestry, Beijing Forestry University, Beijing, 100083 China
| | - Yinruizhi Li
- Turfgrass Research Institute, College of Forestry, Beijing Forestry University, Beijing, 100083 China
| | - Fengqi Liu
- Institute of Grassland Research, Heilongjiang Academy of Agricultural Sciences, Harbin, 150086 China
| | - Liebao Han
- Turfgrass Research Institute, College of Forestry, Beijing Forestry University, Beijing, 100083 China
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75
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Nguyen NH, Cheong JJ. The AtMYB44 promoter is accessible to signals that induce different chromatin modifications for gene transcription. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2018; 130:14-19. [PMID: 29957571 DOI: 10.1016/j.plaphy.2018.06.030] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2018] [Revised: 06/20/2018] [Accepted: 06/21/2018] [Indexed: 06/08/2023]
Abstract
AtMYB44 transcripts accumulate non-specifically under diverse stress conditions and with various phytohormone treatments in Arabidopsis thaliana. We investigated the chromatin modifications caused by various signals to uncover the induction mechanism of AtMYB44 transcription. Bisulfite sequencing confirmed a previous database illustrating that the AtMYB44 promoter and gene-body regions are completely DNA methylation-free. Chromatin immunoprecipitation (ChIP) assays revealed that the nucleosome density is remarkably low at the AtMYB44 promoter region. Thus, the promoter region appears to be highly accessible for various trans-acting factors. ChIP assays revealed that osmotic stress (mannitol treatment) lowered the nucleosome density at the gene-body regions, while abscisic acid (ABA) or jasmonic acid (JA) treatment did so at the proximal transcription start site (TSS) region. In response to mannitol treatment, histone H3 lysine 4 trimethylation (H3K4me3) and H3 acetylation (H3ac) levels within the promoter, TSS, and gene-body regions of AtMYB44 were significantly increased. However, occupancy of histone variant H2A.Z was not affected by the mannitol treatment. We previously reported that salt stress triggered a significant decrease in H2A.Z occupation without affecting the H3K4me3 and H3ac levels. In combination, our data suggest that each signal transduced to the highly accessible promoter induces a different chromatin modification for AtMYB44 transcription.
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Affiliation(s)
- Nguyen Hoai Nguyen
- Center for Food and Bioconvergence, Seoul National University, Seoul, 08826, Republic of Korea
| | - Jong-Joo Cheong
- Center for Food and Bioconvergence, Seoul National University, Seoul, 08826, Republic of Korea.
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76
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Al-Ghamdi AA, Elansary HO. Synergetic effects of 5-aminolevulinic acid and Ascophyllum nodosum seaweed extracts on Asparagus phenolics and stress related genes under saline irrigation. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2018; 129:273-284. [PMID: 29906777 DOI: 10.1016/j.plaphy.2018.06.008] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2018] [Revised: 06/08/2018] [Accepted: 06/08/2018] [Indexed: 05/18/2023]
Abstract
Salinity is one of the major agricultural problems that may threat food security and limit the agricultural lands expansion worldwide. Exploring novel tools controlling saline conditions and increase valuable secondary metabolites in the horticultural crops might have outstanding results that serve humanity in the current century. The current study explores the effects of weekly seaweed extracts (7 mL L-1) and/or 5-aminolevulinic acid (3, 5 and 10 ppm) sprays on Asparagus aethiopicus plants subjected to saline stress conditions (2000 and 4000 ppm) for 6 weeks in two consecutive seasons of 2016 and 2017. Under saline conditions, there were stimulatory synergetic effects of seaweed extracts (SWE) and 5-aminolevulinic acid (ALA) on branch length and number of treated plants. Similar increases were also found in fresh and the dry weight of treated plants compared to control. These morphological improvements associated with increased accumulation of specific phenols (robinin, rutin, apigein, chlorogenic acid and caffeic acid) as revealed by High-Performance Liquid Chromatography with Diode-Array Detection (HPLC-DAD). There were increases in the antioxidant activities of leaf extracts, chlorophyll content and sugars and proline accumulation. The transpiration and photosynthetic rates as well as the stomatal conductance were enhanced. The morphological and physiological improvements associated with increased expression of several genes responsible for water management (ANN1, ANN2 and PIP1), secondary metabolite production (P5CS1 and CHS) and antioxidants accumulation (APX1 and GPX3) in plants. Our findings indicate that SWE + ALA had stimulatory synergetic effects on the growth and secondary metabolites of A. aethiopicus subjected to saline conditions. Several mechanisms are involved in such effects including gas exchange control, sugar buildup, increasing non-enzymatic and enzymatic antioxidants control of reactive oxygen species accumulation as well as transcriptional and metabolic regulation of environmental stress.
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Affiliation(s)
- Abdullah A Al-Ghamdi
- Botany and Microbiology Department, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
| | - Hosam O Elansary
- Plant Production Department, College of Food and Agriculture Sciences, King Saud University, Riyadh, Saudi Arabia; Floriculture, Ornamental Horticulture and Garden Design Department, Faculty of Agriculture (El-Shatby), Alexandria University, Alexandria, Egypt; Department of Geography, Environmental Management and Energy Studies, University of Johannesburg, Auckland Park Kingsway Campus (APK) Campus, 2006, South Africa.
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77
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Mahdavi Mashaki K, Garg V, Nasrollahnezhad Ghomi AA, Kudapa H, Chitikineni A, Zaynali Nezhad K, Yamchi A, Soltanloo H, Varshney RK, Thudi M. RNA-Seq analysis revealed genes associated with drought stress response in kabuli chickpea (Cicer arietinum L.). PLoS One 2018; 13:e0199774. [PMID: 29953498 PMCID: PMC6023194 DOI: 10.1371/journal.pone.0199774] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2018] [Accepted: 06/13/2018] [Indexed: 11/24/2022] Open
Abstract
Drought is the most important constraint that effects chickpea production globally. RNA-Seq has great potential to dissect the molecular mechanisms of tolerance to environmental stresses. Transcriptome profiles in roots and shoots of two contrasting Iranian kabuli chickpea genotypes (Bivanij and Hashem) were investigated under water-limited conditions at early flowering stage using RNA-Seq approach. A total of 4,572 differentially expressed genes (DEGs) were identified. Of these, 261 and 169 drought stress responsive genes were identified in the shoots and the roots, respectively, and 17 genes were common in the shoots and the roots. Gene Ontology (GO) analysis revealed several sub-categories related to the stress, including response to stress, defense response and response to stimulus in the tolerant genotype Bivanij as compared to the sensitive genotype Hashem under drought stress. In addition, several Transcription factors (TFs) were identified in major metabolic pathways such as, ABA, proline and flavonoid biosynthesis. Furthermore, a number of the DEGs were observed in "QTL-hotspot" regions which were reported earlier in chickpea. Drought tolerance dissection in the genotypes revealed that the genes and the pathways involved in shoots of Bivanij were the most important factor to make a difference between the genotypes for drought tolerance. The identified TFs in the experiment, particularly those which were up-regulated in shoots of Bivanij during drought stress, were potential candidates for enhancing tolerance to drought.
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Affiliation(s)
- Keyvan Mahdavi Mashaki
- Department of Plant Breeding and Biotechnology, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran
- Center of Excellence in Genomics and Systems Biology, International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Hyderabad, Telangana, India
| | - Vanika Garg
- Center of Excellence in Genomics and Systems Biology, International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Hyderabad, Telangana, India
| | | | - Himabindu Kudapa
- Center of Excellence in Genomics and Systems Biology, International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Hyderabad, Telangana, India
| | - Annapurna Chitikineni
- Center of Excellence in Genomics and Systems Biology, International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Hyderabad, Telangana, India
| | - Khalil Zaynali Nezhad
- Department of Plant Breeding and Biotechnology, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran
| | - Ahad Yamchi
- Department of Plant Breeding and Biotechnology, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran
| | - Hasan Soltanloo
- Department of Plant Breeding and Biotechnology, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran
| | - Rajeev Kumar Varshney
- Center of Excellence in Genomics and Systems Biology, International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Hyderabad, Telangana, India
| | - Mahendar Thudi
- Center of Excellence in Genomics and Systems Biology, International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Hyderabad, Telangana, India
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78
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Khan SA, Li MZ, Wang SM, Yin HJ. Revisiting the Role of Plant Transcription Factors in the Battle against Abiotic Stress. Int J Mol Sci 2018; 19:ijms19061634. [PMID: 29857524 PMCID: PMC6032162 DOI: 10.3390/ijms19061634] [Citation(s) in RCA: 124] [Impact Index Per Article: 20.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2018] [Revised: 05/10/2018] [Accepted: 05/24/2018] [Indexed: 01/01/2023] Open
Abstract
Owing to diverse abiotic stresses and global climate deterioration, the agricultural production worldwide is suffering serious losses. Breeding stress-resilient crops with higher quality and yield against multiple environmental stresses via application of transgenic technologies is currently the most promising approach. Deciphering molecular principles and mining stress-associate genes that govern plant responses against abiotic stresses is one of the prerequisites to develop stress-resistant crop varieties. As molecular switches in controlling stress-responsive genes expression, transcription factors (TFs) play crucial roles in regulating various abiotic stress responses. Hence, functional analysis of TFs and their interaction partners during abiotic stresses is crucial to perceive their role in diverse signaling cascades that many researchers have continued to undertake. Here, we review current developments in understanding TFs, with particular emphasis on their functions in orchestrating plant abiotic stress responses. Further, we discuss novel molecular mechanisms of their action under abiotic stress conditions. This will provide valuable information for understanding regulatory mechanisms to engineer stress-tolerant crops.
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Affiliation(s)
- Sardar-Ali Khan
- State Key Laboratory of Grassland Agro-ecosystems, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou 730000, China.
| | - Meng-Zhan Li
- State Key Laboratory of Grassland Agro-ecosystems, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou 730000, China.
| | - Suo-Min Wang
- State Key Laboratory of Grassland Agro-ecosystems, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou 730000, China.
| | - Hong-Ju Yin
- State Key Laboratory of Grassland Agro-ecosystems, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou 730000, China.
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79
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Time-evolving genetic networks reveal a NAC troika that negatively regulates leaf senescence in Arabidopsis. Proc Natl Acad Sci U S A 2018; 115:E4930-E4939. [PMID: 29735710 PMCID: PMC6003463 DOI: 10.1073/pnas.1721523115] [Citation(s) in RCA: 73] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Leaf senescence is regulated in a complex manner, involving time-dependent interactions with developmental and environmental signals. Genetic screens have identified key regulators of senescence, particularly late-stage senescence regulators. Recently, time-course gene-expression and network analyses, mostly analyses of static networks, have predicted many senescence regulators. However, senescence is defined by time-evolving networks, involving the temporal transition of interactions among senescence regulators. Here, we present time-evolving networks of NAM/ATAF/CUC (NAC) transcription factors, central regulators of leaf senescence in Arabidopsis, via time-course gene-expression analysis of NACs in their mutants. These time-evolving networks revealed a unique regulatory module of NACs that controls the timely induction of senescence-promoting processes at a presenescent stage of leaf aging. Senescence is controlled by time-evolving networks that describe the temporal transition of interactions among senescence regulators. Here, we present time-evolving networks for NAM/ATAF/CUC (NAC) transcription factors in Arabidopsis during leaf aging. The most evident characteristic of these time-dependent networks was a shift from positive to negative regulation among NACs at a presenescent stage. ANAC017, ANAC082, and ANAC090, referred to as a “NAC troika,” govern the positive-to-negative regulatory shift. Knockout of the NAC troika accelerated senescence and the induction of other NACs, whereas overexpression of the NAC troika had the opposite effects. Transcriptome and molecular analyses revealed shared suppression of senescence-promoting processes by the NAC troika, including salicylic acid (SA) and reactive oxygen species (ROS) responses, but with predominant regulation of SA and ROS responses by ANAC090 and ANAC017, respectively. Our time-evolving networks provide a unique regulatory module of presenescent repressors that direct the timely induction of senescence-promoting processes at the presenescent stage of leaf aging.
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80
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Transcriptome profiling of rubber tree (Hevea brasiliensis) discovers candidate regulators of the cold stress response. Genes Genomics 2018; 40:1181-1197. [DOI: 10.1007/s13258-018-0681-5] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2017] [Accepted: 02/28/2018] [Indexed: 01/26/2023]
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81
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Maher KA, Bajic M, Kajala K, Reynoso M, Pauluzzi G, West DA, Zumstein K, Woodhouse M, Bubb K, Dorrity MW, Queitsch C, Bailey-Serres J, Sinha N, Brady SM, Deal RB. Profiling of Accessible Chromatin Regions across Multiple Plant Species and Cell Types Reveals Common Gene Regulatory Principles and New Control Modules. THE PLANT CELL 2018. [PMID: 29229750 DOI: 10.1101/167932] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
The transcriptional regulatory structure of plant genomes remains poorly defined relative to animals. It is unclear how many cis-regulatory elements exist, where these elements lie relative to promoters, and how these features are conserved across plant species. We employed the assay for transposase-accessible chromatin (ATAC-seq) in four plant species (Arabidopsis thaliana, Medicago truncatula, Solanum lycopersicum, and Oryza sativa) to delineate open chromatin regions and transcription factor (TF) binding sites across each genome. Despite 10-fold variation in intergenic space among species, the majority of open chromatin regions lie within 3 kb upstream of a transcription start site in all species. We find a common set of four TFs that appear to regulate conserved gene sets in the root tips of all four species, suggesting that TF-gene networks are generally conserved. Comparative ATAC-seq profiling of Arabidopsis root hair and non-hair cell types revealed extensive similarity as well as many cell-type-specific differences. Analyzing TF binding sites in differentially accessible regions identified a MYB-driven regulatory module unique to the hair cell, which appears to control both cell fate regulators and abiotic stress responses. Our analyses revealed common regulatory principles among species and shed light on the mechanisms producing cell-type-specific transcriptomes during development.
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Affiliation(s)
- Kelsey A Maher
- Department of Biology, Emory University, Atlanta, Georgia 30322
- Graduate Program in Biochemistry, Cell, and Developmental Biology, Emory University, Atlanta, Georgia 30322
| | - Marko Bajic
- Department of Biology, Emory University, Atlanta, Georgia 30322
- Graduate Program in Genetics and Molecular Biology, Emory University, Atlanta, Georgia 30322
| | - Kaisa Kajala
- Department of Plant Biology and Genome Center, University of California, Davis, California 95616
| | - Mauricio Reynoso
- Center for Plant Cell Biology, Botany and Plant Sciences Department, University of California, Riverside, California 92521
| | - Germain Pauluzzi
- Center for Plant Cell Biology, Botany and Plant Sciences Department, University of California, Riverside, California 92521
| | - Donnelly A West
- Department of Plant Biology, University of California, Davis, California 95616
| | - Kristina Zumstein
- Department of Plant Biology, University of California, Davis, California 95616
| | - Margaret Woodhouse
- Department of Plant Biology, University of California, Davis, California 95616
| | - Kerry Bubb
- University of Washington, School of Medicine, Department of Genome Sciences, Seattle, Washington 98195
| | - Michael W Dorrity
- University of Washington, School of Medicine, Department of Genome Sciences, Seattle, Washington 98195
| | - Christine Queitsch
- University of Washington, School of Medicine, Department of Genome Sciences, Seattle, Washington 98195
| | - Julia Bailey-Serres
- Center for Plant Cell Biology, Botany and Plant Sciences Department, University of California, Riverside, California 92521
| | - Neelima Sinha
- Department of Plant Biology, University of California, Davis, California 95616
| | - Siobhan M Brady
- Department of Plant Biology and Genome Center, University of California, Davis, California 95616
| | - Roger B Deal
- Department of Biology, Emory University, Atlanta, Georgia 30322
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82
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Maher KA, Bajic M, Kajala K, Reynoso M, Pauluzzi G, West DA, Zumstein K, Woodhouse M, Bubb K, Dorrity MW, Queitsch C, Bailey-Serres J, Sinha N, Brady SM, Deal RB. Profiling of Accessible Chromatin Regions across Multiple Plant Species and Cell Types Reveals Common Gene Regulatory Principles and New Control Modules. THE PLANT CELL 2018; 30:15-36. [PMID: 29229750 PMCID: PMC5810565 DOI: 10.1105/tpc.17.00581] [Citation(s) in RCA: 175] [Impact Index Per Article: 29.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2017] [Revised: 10/30/2017] [Accepted: 12/06/2017] [Indexed: 05/19/2023]
Abstract
The transcriptional regulatory structure of plant genomes remains poorly defined relative to animals. It is unclear how many cis-regulatory elements exist, where these elements lie relative to promoters, and how these features are conserved across plant species. We employed the assay for transposase-accessible chromatin (ATAC-seq) in four plant species (Arabidopsis thaliana, Medicago truncatula, Solanum lycopersicum, and Oryza sativa) to delineate open chromatin regions and transcription factor (TF) binding sites across each genome. Despite 10-fold variation in intergenic space among species, the majority of open chromatin regions lie within 3 kb upstream of a transcription start site in all species. We find a common set of four TFs that appear to regulate conserved gene sets in the root tips of all four species, suggesting that TF-gene networks are generally conserved. Comparative ATAC-seq profiling of Arabidopsis root hair and non-hair cell types revealed extensive similarity as well as many cell-type-specific differences. Analyzing TF binding sites in differentially accessible regions identified a MYB-driven regulatory module unique to the hair cell, which appears to control both cell fate regulators and abiotic stress responses. Our analyses revealed common regulatory principles among species and shed light on the mechanisms producing cell-type-specific transcriptomes during development.
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Affiliation(s)
- Kelsey A Maher
- Department of Biology, Emory University, Atlanta, Georgia 30322
- Graduate Program in Biochemistry, Cell, and Developmental Biology, Emory University, Atlanta, Georgia 30322
| | - Marko Bajic
- Department of Biology, Emory University, Atlanta, Georgia 30322
- Graduate Program in Genetics and Molecular Biology, Emory University, Atlanta, Georgia 30322
| | - Kaisa Kajala
- Department of Plant Biology and Genome Center, University of California, Davis, California 95616
| | - Mauricio Reynoso
- Center for Plant Cell Biology, Botany and Plant Sciences Department, University of California, Riverside, California 92521
| | - Germain Pauluzzi
- Center for Plant Cell Biology, Botany and Plant Sciences Department, University of California, Riverside, California 92521
| | - Donnelly A West
- Department of Plant Biology, University of California, Davis, California 95616
| | - Kristina Zumstein
- Department of Plant Biology, University of California, Davis, California 95616
| | - Margaret Woodhouse
- Department of Plant Biology, University of California, Davis, California 95616
| | - Kerry Bubb
- University of Washington, School of Medicine, Department of Genome Sciences, Seattle, Washington 98195
| | - Michael W Dorrity
- University of Washington, School of Medicine, Department of Genome Sciences, Seattle, Washington 98195
| | - Christine Queitsch
- University of Washington, School of Medicine, Department of Genome Sciences, Seattle, Washington 98195
| | - Julia Bailey-Serres
- Center for Plant Cell Biology, Botany and Plant Sciences Department, University of California, Riverside, California 92521
| | - Neelima Sinha
- Department of Plant Biology, University of California, Davis, California 95616
| | - Siobhan M Brady
- Department of Plant Biology and Genome Center, University of California, Davis, California 95616
| | - Roger B Deal
- Department of Biology, Emory University, Atlanta, Georgia 30322
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Feng G, Huang L, Li J, Wang J, Xu L, Pan L, Zhao X, Wang X, Huang T, Zhang X. Comprehensive transcriptome analysis reveals distinct regulatory programs during vernalization and floral bud development of orchardgrass (Dactylis glomerata L.). BMC PLANT BIOLOGY 2017; 17:216. [PMID: 29166861 PMCID: PMC5700690 DOI: 10.1186/s12870-017-1170-8] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2017] [Accepted: 11/10/2017] [Indexed: 05/21/2023]
Abstract
BACKGROUND Vernalization and the transition from vegetative to reproductive growth involve multiple pathways, vital for controlling floral organ formation and flowering time. However, little transcription information is available about the mechanisms behind environmental adaption and growth regulation. Here, we used high-throughput sequencing to analyze the comprehensive transcriptome of Dactylis glomerata L. during six different growth periods. RESULTS During vernalization, 4689 differentially expressed genes (DEGs) significantly increased in abundance, while 3841 decreased. Furthermore, 12,967 DEGs were identified during booting stage and flowering stage, including 7750 up-regulated and 5219 down-regulated DEGs. Pathway analysis indicated that transcripts related to circadian rhythm, photoperiod, photosynthesis, flavonoid biosynthesis, starch, and sucrose metabolism changed significantly at different stages. Coexpression and weighted correlation network analysis (WGCNA) analysis linked different stages to transcriptional changes and provided evidence of inner relation modules associated with signal transduction, stress responses, cell division, and hormonal transport. CONCLUSIONS We found enrichment in transcription factors (TFs) related to WRKY, NAC, AP2/EREBP, AUX/IAA, MADS-BOX, ABI3/VP1, bHLH, and the CCAAT family during vernalization and floral bud development. TFs expression patterns revealed intricate temporal variations, suggesting relatively separate regulatory programs of TF modules. Further study will unlock insights into the ability of the circadian rhythm and photoperiod to regulate vernalization and flowering time in perennial grass.
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Affiliation(s)
- Guangyan Feng
- Department of Grassland Science, College of Animal Science and Technology, Sichuan Agricultural University, Chengdu, China
| | - Linkai Huang
- Department of Grassland Science, College of Animal Science and Technology, Sichuan Agricultural University, Chengdu, China
| | - Ji Li
- Department of Grassland Science, College of Animal Science and Technology, Sichuan Agricultural University, Chengdu, China
| | - Jianping Wang
- Agronomy Department, University of Florida, Gainesville, FL USA
| | - Lei Xu
- Department of Grassland Science, College of Animal Science and Technology, Sichuan Agricultural University, Chengdu, China
| | - Ling Pan
- Department of Grassland Science, College of Animal Science and Technology, Sichuan Agricultural University, Chengdu, China
| | - Xinxin Zhao
- Department of Grassland Science, College of Animal Science and Technology, Sichuan Agricultural University, Chengdu, China
| | - Xia Wang
- Department of Grassland Science, College of Animal Science and Technology, Sichuan Agricultural University, Chengdu, China
| | - Ting Huang
- Department of Grassland Science, College of Animal Science and Technology, Sichuan Agricultural University, Chengdu, China
| | - Xinquan Zhang
- Department of Grassland Science, College of Animal Science and Technology, Sichuan Agricultural University, Chengdu, China
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84
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Dar NA, Amin I, Wani W, Wani SA, Shikari AB, Wani SH, Masoodi KZ. Abscisic acid: A key regulator of abiotic stress tolerance in plants. ACTA ACUST UNITED AC 2017. [DOI: 10.1016/j.plgene.2017.07.003] [Citation(s) in RCA: 60] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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85
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86
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Rymaszewski W, Vile D, Bediee A, Dauzat M, Luchaire N, Kamrowska D, Granier C, Hennig J. Stress-Related Gene Expression Reflects Morphophysiological Responses to Water Deficit. PLANT PHYSIOLOGY 2017; 174:1913-1930. [PMID: 28522456 PMCID: PMC5490902 DOI: 10.1104/pp.17.00318] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2017] [Accepted: 05/15/2017] [Indexed: 05/18/2023]
Abstract
Acclimation to water deficit (WD) enables plants to maintain growth under unfavorable environmental conditions, although the mechanisms are not completely understood. In this study, the natural variation of long-term acclimation to moderate and severe soil WD was investigated in 18 Arabidopsis (Arabidopsis thaliana) accessions using PHENOPSIS, an automated phenotyping platform. Soil water content was adjusted at an early stage of plant development and maintained at a constant level until reproductive age was achieved. The accessions were selected based on the expression levels of ANNEXIN1, a drought-related marker. Severe WD conditions had a greater effect on most of the measured morphophysiological traits than moderate WD conditions. Multivariate analyses indicated that trait responses associated with plant size and water management drove most of the variation. Accessions with similar responses at these two levels were grouped in clusters that displayed different response strategies to WD The expression levels of selected stress-response genes revealed large natural variation under WD conditions. Responses of morphophysiological traits, such as projected rosette area, transpiration rate, and rosette water content, were correlated with changes in the expression of stress-related genes, such as NINE-CIS-EPOXYCAROTENOID DIOXYGENASE3 and N-MYC DOWNREGULATED-LIKE1 (NDL1), in response to WD Interestingly, the morphophysiological acclimation response to WD also was reflected in the gene expression levels (most notably those of NDL1, CHALCONE SYNTHASE, and MYB DOMAIN PROTEIN44) in plants cultivated under well-watered conditions. Our results may lead to the development of biomarkers and predictors of plant morphophysiological responses based on gene expression patterns.
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Affiliation(s)
- Wojciech Rymaszewski
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, 02-106 Warsaw, Poland
| | - Denis Vile
- Laboratoire d'Ecophysiologie des Plantes sous Stress Environnementaux, Institut National de la Recherche Agronomique-Supagro, 34060 Montpellier, France
| | - Alexis Bediee
- Laboratoire d'Ecophysiologie des Plantes sous Stress Environnementaux, Institut National de la Recherche Agronomique-Supagro, 34060 Montpellier, France
| | - Myriam Dauzat
- Laboratoire d'Ecophysiologie des Plantes sous Stress Environnementaux, Institut National de la Recherche Agronomique-Supagro, 34060 Montpellier, France
| | - Nathalie Luchaire
- Laboratoire d'Ecophysiologie des Plantes sous Stress Environnementaux, Institut National de la Recherche Agronomique-Supagro, 34060 Montpellier, France
| | - Dominika Kamrowska
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, 02-106 Warsaw, Poland
| | - Christine Granier
- Laboratoire d'Ecophysiologie des Plantes sous Stress Environnementaux, Institut National de la Recherche Agronomique-Supagro, 34060 Montpellier, France
| | - Jacek Hennig
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, 02-106 Warsaw, Poland
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87
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Pandey JK, Dash SK, Biswal B. Loss in photosynthesis during senescence is accompanied by an increase in the activity of β-galactosidase in leaves of Arabidopsis thaliana: modulation of the enzyme activity by water stress. PROTOPLASMA 2017; 254:1651-1659. [PMID: 27942976 DOI: 10.1007/s00709-016-1061-0] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2016] [Accepted: 12/02/2016] [Indexed: 05/21/2023]
Abstract
The precise nature of the developmental modulation of the activity of cell wall hydrolases that breakdown the wall polysaccharides to maintain cellular sugar homeostasis under sugar starvation environment still remains unclear. In this work, the activity of β-galactosidase (EC 3.2.1.23), a cell-wall-bound enzyme known to degrade the wall polysaccharides, has been demonstrated to remarkably enhance during senescence-induced loss in photosynthesis in Arabidopsis thaliana. The enhancement in the enzyme activity reaches a peak at the terminal phase of senescence when the rate of photosynthesis is at its minimum. Although the precise nature of chemistry of the interface between the decline in photosynthesis and enhancement in the activity of the enzyme could not be fully resolved, the enhancement in its activity in dark and its suppression in light or with exogenous sugars may indicate the involvement of loss of photosynthetic production of sugars as a key factor that initiates and stimulates the activity of the enzyme. The hydrolase possibly participates in the catabolic network of cell wall polysaccharides to produce sugars for execution of energy-dependant senescence program in the background of loss of photosynthesis. Drought stress experienced by the senescing leaves accelerates the decline in photosynthesis with further stimulation in the activity of the enzyme. The stress recovery of photosynthesis and suppression of the enzyme activity on withdrawal of stress support the proposition of photosynthetic modulation of the cell-wall-bound enzyme activity.
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Affiliation(s)
- Jitendra Kumar Pandey
- Laboratory of Biochemistry and Molecular Biology, School of Life Sciences, Sambalpur University, Jyoti Vihar, Burla, Odisha, 768019, India
| | - Sidhartha Kumar Dash
- Laboratory of Biochemistry and Molecular Biology, School of Life Sciences, Sambalpur University, Jyoti Vihar, Burla, Odisha, 768019, India
| | - Basanti Biswal
- Laboratory of Biochemistry and Molecular Biology, School of Life Sciences, Sambalpur University, Jyoti Vihar, Burla, Odisha, 768019, India.
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88
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Ruan MB, Guo X, Wang B, Yang YL, Li WQ, Yu XL, Zhang P, Peng M. Genome-wide characterization and expression analysis enables identification of abiotic stress-responsive MYB transcription factors in cassava (Manihot esculenta). JOURNAL OF EXPERIMENTAL BOTANY 2017; 68:3657-3672. [PMID: 28637218 DOI: 10.1093/jxb/erx202] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The myeloblastosis (MYB) transcription factor superfamily is the largest transcription factor family in plants, playing different roles during stress response. However, abiotic stress-responsive MYB transcription factors have not been systematically studied in cassava (Manihot esculenta), an important tropical tuber root crop. In this study, we used a genome-wide transcriptome analysis to predict 299 putative MeMYB genes in the cassava genome. Under drought and cold stresses, many MeMYB genes exhibited different expression patterns in cassava leaves, indicating that these genes might play a role in abiotic stress responses. We found that several stress-responsive MeMYB genes responded to abscisic acid (ABA) in cassava leaves. We characterize four MeMYBs, namely MeMYB1, MeMYB2, MeMYB4, and MeMYB9, as R2R3-MYB transcription factors. Furthermore, RNAi-driven repression of MeMYB2 resulted in drought and cold tolerance in transgenic cassava. Gene expression assays in wild-type and MeMYB2-RNAi cassava plants revealed that MeMYB2 may affect other MeMYBs as well as MeWRKYs under drought and cold stress, suggesting crosstalk between MYB and WRKY family genes under stress conditions in cassava.
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Affiliation(s)
- Meng-Bin Ruan
- Institute of Tropical Bioscience and Biotechnology, Chinese Academy of Tropical Agricultural Science, Haikou 571101, China
- Key Laboratory of Biology and Genetic Resources of Tropical Crops, Ministry of Agriculture, Haikou 571101, China
| | - Xin Guo
- Huazhong Agricultural University, Wuhan 430070, China
| | - Bin Wang
- Huazhong Agricultural University, Wuhan 430070, China
| | - Yi-Ling Yang
- Crops Research Institute, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China
| | - Wen-Qi Li
- Institute of Tropical Bioscience and Biotechnology, Chinese Academy of Tropical Agricultural Science, Haikou 571101, China
| | - Xiao-Ling Yu
- Institute of Tropical Bioscience and Biotechnology, Chinese Academy of Tropical Agricultural Science, Haikou 571101, China
- Key Laboratory of Biology and Genetic Resources of Tropical Crops, Ministry of Agriculture, Haikou 571101, China
| | - Peng Zhang
- National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence and Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Science, Chinese Academy of Science, Shanghai 200032, China
| | - Ming Peng
- Institute of Tropical Bioscience and Biotechnology, Chinese Academy of Tropical Agricultural Science, Haikou 571101, China
- Key Laboratory of Biology and Genetic Resources of Tropical Crops, Ministry of Agriculture, Haikou 571101, China
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89
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Miyakawa T, Tanokura M. Structural basis for the regulation of phytohormone receptors. Biosci Biotechnol Biochem 2017; 81:1261-1273. [PMID: 28417669 DOI: 10.1080/09168451.2017.1313696] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
Phytohormones are central players in diverse plant physiological events, such as plant growth, development, and environmental stress and defense responses. The elucidation of their regulatory mechanisms through phytohormone receptors could facilitate the generation of transgenic crops with cultivation advantages and the rational design of growth control chemicals. During the last decade, accumulated structural data on phytohormone receptors have provided critical insights into the molecular mechanisms of phytohormone perception and signal transduction. Here, we review the structural bases of phytohormone recognition and receptor activation. As a common feature, phytohormones regulate the interaction between the receptors and their respective target proteins (also called co-receptors) by two types of regulatory mechanisms, acting as either "molecular glue" or an "allosteric regulator." However, individual phytohormone receptors adopt specific structural features that are essential for activation. In addition, recent studies have focused on the molecular diversity of redundant phytohormone receptors.
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Affiliation(s)
- Takuya Miyakawa
- a Department of Applied Biological Chemistry , Graduate School of Agricultural and Life Sciences, The University of Tokyo , Tokyo , Japan
| | - Masaru Tanokura
- a Department of Applied Biological Chemistry , Graduate School of Agricultural and Life Sciences, The University of Tokyo , Tokyo , Japan
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90
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Kim YY, Cui MH, Noh MS, Jung KW, Shin JS. The FBA motif-containing protein AFBA1 acts as a novel positive regulator of ABA response in Arabidopsis. PLANT & CELL PHYSIOLOGY 2017; 58:574-586. [PMID: 28184867 DOI: 10.1093/pcp/pcx003] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2016] [Accepted: 01/04/2017] [Indexed: 06/06/2023]
Abstract
ABA plays a critical role in regulating seed germination and stomatal movement in response to drought stress. Screening ABA-responsive genes led to the identification of a novel Arabidopsis gene encoding a protein which contained a conserved F-box-associated (FBA) domain, subsequently named ABA-responsive FBA domain-containing protein 1 (AFBA1). Expression of ProAFBA1:GUS revealed that this gene was mainly expressed in guard cells. Expression of AFBA1 increased following the application of exogenous ABA and exposure to salt (NaCl) and drought stresses. Seed germination of the loss-of-function mutant (afba1) was insensitive to ABA, salt or mannitol, whereas AFBA1-overexpressing (Ox) seeds were more sensitive to these stresses than the wild-type seeds. The afba1 plants showed decreased drought tolerance, increased water loss rate and ABA-insensitive stomatal movement compared with the wild-type. In contrast, AFBA1-Ox plants exhibited enhanced drought tolerance and a rapid ABA-induced stomatal closure response. The expression of genes encoding serine/threonine protein phosphatases that are known negative regulators of ABA signaling increased in afba1 plants but decreased in AFBA1-Ox plants. AFBA1 was also found to be localized in the nucleus and to interact with an R2R3-type transcription factor, MYB44, leading to the suggestion that it functions in the stabilization of MYB44. Based on these results, we suggest that AFBA1 functions as a novel positive regulator of ABA responses, regulating the expression of genes involved in ABA signal transduction in Arabidopsis through its interaction with positive regulators of ABA signaling including MYB44, and increasing their stability during ABA-mediated responses.
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Affiliation(s)
- Yun Young Kim
- Division of Life Sciences, Korea University, Seoul 136-701, Korea
| | - Mei Hua Cui
- Division of Life Sciences, Korea University, Seoul 136-701, Korea
- School of Life Sciences and Biotechnology, Shanghai JiaoTong University, Shanghai 200240, China
| | - Min Soo Noh
- Division of Life Sciences, Korea University, Seoul 136-701, Korea
| | - Kwang Wook Jung
- Division of Life Sciences, Korea University, Seoul 136-701, Korea
- DuPont Pioneer Hi-Bred, DuPont (Korea) Inc., Gangnam-gu, Seoul 135-719, Korea
| | - Jeong Sheop Shin
- Division of Life Sciences, Korea University, Seoul 136-701, Korea
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91
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Zhou X, Zha M, Huang J, Li L, Imran M, Zhang C. StMYB44 negatively regulates phosphate transport by suppressing expression of PHOSPHATE1 in potato. JOURNAL OF EXPERIMENTAL BOTANY 2017; 68:1265-1281. [PMID: 28338870 PMCID: PMC5441854 DOI: 10.1093/jxb/erx026] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Phosphorus is an important macronutrient for plant growth, but often deficient in soil. To understand the molecular basis of the complex responses of potato (Solanum tuberosum L.) to phosphate (Pi) deficiency stress, the RNA-Seq approach was taken to identify genes responding to Pi starvation in potato roots. A total of 359 differentially expressed genes were identified, among which the Solanum tuberosum transcription factor gene MYB44 (StMYB44) was found to be down-regulated by Pi starvation. StMYB44 was ubiquitously expressed in potato tissues and organs, and StMYB44 protein was exclusively localized in the nucleus. Overexpression of StMYB44 in potato resulted in lower accumulation of Pi in shoots. Transcriptomic analysis indicated that the abundance of S. tuberosum PHOSPHATE1 (StPHO1), a Pi transport-related gene, was reduced in StMYB44 overexpression lines. In contrast, knock-out of StMYB44 by a CRISPR/Cas9 system failed to increase transcription of StPHO1. Moreover, StMYB44 was found to interact in the nucleus with AtWRKY6, a known Arabidopsis transcription factor directly regulating PHO1 expression, and StWRKY6, indicating that StMYB44 could be a member of the regulatory complex controlling transcription of StPHO1. Taken together, our study demonstrates that StMYB44 negatively regulates Pi transport in potato by suppressing StPHO1 expression.
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Affiliation(s)
- Xiangjun Zhou
- Department of Agronomy, Purdue University, West Lafayette IN 47907, USA
| | - Manrong Zha
- Department of Agronomy, Purdue University, West Lafayette IN 47907, USA
| | - Jing Huang
- Department of Agronomy, Purdue University, West Lafayette IN 47907, USA
| | - Li Li
- Robert W. Holley Center for Agriculture and Health, USDA-ARS, Cornell University, Ithaca, NY 14853, USA
| | - Muhammad Imran
- Department of Agronomy, Purdue University, West Lafayette IN 47907, USA
- Department of Soil and Environmental Sciences, University College of Agriculture, University of Sargodha, Pakistan 40100
| | - Cankui Zhang
- Department of Agronomy, Purdue University, West Lafayette IN 47907, USA
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92
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Zhou M, Callaham JB, Reyes M, Stasiak M, Riva A, Zupanska AK, Dixon MA, Paul AL, Ferl RJ. Dissecting Low Atmospheric Pressure Stress: Transcriptome Responses to the Components of Hypobaria in Arabidopsis. FRONTIERS IN PLANT SCIENCE 2017; 8:528. [PMID: 28443120 PMCID: PMC5385376 DOI: 10.3389/fpls.2017.00528] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2016] [Accepted: 03/24/2017] [Indexed: 05/10/2023]
Abstract
Controlled hypobaria presents biology with an environment that is never encountered in terrestrial ecology, yet the apparent components of hypobaria are stresses typical of terrestrial ecosystems. High altitude, for example, presents terrestrial hypobaria always with hypoxia as a component stress, since the relative partial pressure of O2 is constant in the atmosphere. Laboratory-controlled hypobaria, however, allows the dissection of pressure effects away from the effects typically associated with altitude, in particular hypoxia, as the partial pressure of O2 can be varied. In this study, whole transcriptomes of plants grown in ambient (97 kPa/pO2 = 21 kPa) atmospheric conditions were compared to those of plants transferred to five different atmospheres of varying pressure and oxygen composition for 24 h: 50 kPa/pO2 = 10 kPa, 25 kPa/pO2 = 5 kPa, 50 kPa/pO2 = 21 kPa, 25 kPa/pO2 = 21 kPa, or 97 kPa/pO2 = 5 kPa. The plants exposed to these environments were 10 day old Arabidopsis seedlings grown vertically on hydrated nutrient plates. In addition, 5 day old plants were also exposed for 24 h to the 50 kPa and ambient environments to evaluate age-dependent responses. The gene expression profiles from roots and shoots showed that the hypobaric response contained more complex gene regulation than simple hypoxia, and that adding back oxygen to normoxic conditions did not completely alleviate gene expression changes in hypobaric responses.
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Affiliation(s)
- Mingqi Zhou
- Department of Horticultural Sciences, Program in Plant Molecular and Cellular Biology, University of FloridaGainesville, FL, USA
| | - Jordan B. Callaham
- Department of Horticultural Sciences, Program in Plant Molecular and Cellular Biology, University of FloridaGainesville, FL, USA
| | | | - Michael Stasiak
- School of Environmental Sciences, University of GuelphGuelph, ON, Canada
| | - Alberto Riva
- Interdisciplinary Center for Biotechnology Research, University of FloridaGainesville, FL, USA
| | - Agata K. Zupanska
- Department of Horticultural Sciences, Program in Plant Molecular and Cellular Biology, University of FloridaGainesville, FL, USA
| | - Mike A. Dixon
- School of Environmental Sciences, University of GuelphGuelph, ON, Canada
| | - Anna-Lisa Paul
- Department of Horticultural Sciences, Program in Plant Molecular and Cellular Biology, University of FloridaGainesville, FL, USA
- *Correspondence: Anna-Lisa Paul
| | - Robert J. Ferl
- Department of Horticultural Sciences, Program in Plant Molecular and Cellular Biology, University of FloridaGainesville, FL, USA
- Interdisciplinary Center for Biotechnology Research, University of FloridaGainesville, FL, USA
- Robert J. Ferl
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93
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LI T, SUN J, BI Y. A R2R3 MYB transcription factor from ash positively regulates salt response in tobacco. Turk J Biol 2017. [DOI: 10.3906/biy-1612-31] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
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94
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Papazian S, Khaling E, Bonnet C, Lassueur S, Reymond P, Moritz T, Blande JD, Albrectsen BR. Central Metabolic Responses to Ozone and Herbivory Affect Photosynthesis and Stomatal Closure. PLANT PHYSIOLOGY 2016; 172:2057-2078. [PMID: 27758847 PMCID: PMC5100778 DOI: 10.1104/pp.16.01318] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/23/2016] [Accepted: 10/03/2016] [Indexed: 05/04/2023]
Abstract
Plants have evolved adaptive mechanisms that allow them to tolerate a continuous range of abiotic and biotic stressors. Tropospheric ozone (O3), a global anthropogenic pollutant, directly affects living organisms and ecosystems, including plant-herbivore interactions. In this study, we investigate the stress responses of Brassica nigra (wild black mustard) exposed consecutively to O3 and the specialist herbivore Pieris brassicae Transcriptomics and metabolomics data were evaluated using multivariate, correlation, and network analyses for the O3 and herbivory responses. O3 stress symptoms resembled those of senescence and phosphate starvation, while a sequential shift from O3 to herbivory induced characteristic plant defense responses, including a decrease in central metabolism, induction of the jasmonic acid/ethylene pathways, and emission of volatiles. Omics network and pathway analyses predicted a link between glycerol and central energy metabolism that influences the osmotic stress response and stomatal closure. Further physiological measurements confirmed that while O3 stress inhibited photosynthesis and carbon assimilation, sequential herbivory counteracted the initial responses induced by O3, resulting in a phenotype similar to that observed after herbivory alone. This study clarifies the consequences of multiple stress interactions on a plant metabolic system and also illustrates how omics data can be integrated to generate new hypotheses in ecology and plant physiology.
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Affiliation(s)
- Stefano Papazian
- Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, 90187 Umeå (S.P., B.R.A.); Department of Forest Genetic and Plant Physiology, Swedish University of Agricultural Sciences, 90183 Umeå, Sweden (T.M.)
- Department of Environmental and Biological Sciences, University of Eastern Finland, FIN-70211 Kuopio, Finland (E.K., J.D.B.); and
- Department of Plant Molecular Biology, University of Lausanne, 1015 Lausanne, Switzerland (C.B., S.L., P.R.)
| | - Eliezer Khaling
- Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, 90187 Umeå (S.P., B.R.A.); Department of Forest Genetic and Plant Physiology, Swedish University of Agricultural Sciences, 90183 Umeå, Sweden (T.M.)
- Department of Environmental and Biological Sciences, University of Eastern Finland, FIN-70211 Kuopio, Finland (E.K., J.D.B.); and
- Department of Plant Molecular Biology, University of Lausanne, 1015 Lausanne, Switzerland (C.B., S.L., P.R.)
| | - Christelle Bonnet
- Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, 90187 Umeå (S.P., B.R.A.); Department of Forest Genetic and Plant Physiology, Swedish University of Agricultural Sciences, 90183 Umeå, Sweden (T.M.)
- Department of Environmental and Biological Sciences, University of Eastern Finland, FIN-70211 Kuopio, Finland (E.K., J.D.B.); and
- Department of Plant Molecular Biology, University of Lausanne, 1015 Lausanne, Switzerland (C.B., S.L., P.R.)
| | - Steve Lassueur
- Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, 90187 Umeå (S.P., B.R.A.); Department of Forest Genetic and Plant Physiology, Swedish University of Agricultural Sciences, 90183 Umeå, Sweden (T.M.)
- Department of Environmental and Biological Sciences, University of Eastern Finland, FIN-70211 Kuopio, Finland (E.K., J.D.B.); and
- Department of Plant Molecular Biology, University of Lausanne, 1015 Lausanne, Switzerland (C.B., S.L., P.R.)
| | - Philippe Reymond
- Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, 90187 Umeå (S.P., B.R.A.); Department of Forest Genetic and Plant Physiology, Swedish University of Agricultural Sciences, 90183 Umeå, Sweden (T.M.)
- Department of Environmental and Biological Sciences, University of Eastern Finland, FIN-70211 Kuopio, Finland (E.K., J.D.B.); and
- Department of Plant Molecular Biology, University of Lausanne, 1015 Lausanne, Switzerland (C.B., S.L., P.R.)
| | - Thomas Moritz
- Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, 90187 Umeå (S.P., B.R.A.); Department of Forest Genetic and Plant Physiology, Swedish University of Agricultural Sciences, 90183 Umeå, Sweden (T.M.)
- Department of Environmental and Biological Sciences, University of Eastern Finland, FIN-70211 Kuopio, Finland (E.K., J.D.B.); and
- Department of Plant Molecular Biology, University of Lausanne, 1015 Lausanne, Switzerland (C.B., S.L., P.R.)
| | - James D Blande
- Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, 90187 Umeå (S.P., B.R.A.); Department of Forest Genetic and Plant Physiology, Swedish University of Agricultural Sciences, 90183 Umeå, Sweden (T.M.);
- Department of Environmental and Biological Sciences, University of Eastern Finland, FIN-70211 Kuopio, Finland (E.K., J.D.B.); and
- Department of Plant Molecular Biology, University of Lausanne, 1015 Lausanne, Switzerland (C.B., S.L., P.R.)
| | - Benedicte R Albrectsen
- Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, 90187 Umeå (S.P., B.R.A.); Department of Forest Genetic and Plant Physiology, Swedish University of Agricultural Sciences, 90183 Umeå, Sweden (T.M.);
- Department of Environmental and Biological Sciences, University of Eastern Finland, FIN-70211 Kuopio, Finland (E.K., J.D.B.); and
- Department of Plant Molecular Biology, University of Lausanne, 1015 Lausanne, Switzerland (C.B., S.L., P.R.)
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95
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Zhao Q, Li M, Jia Z, Liu F, Ma H, Huang Y, Song S. AtMYB44 Positively Regulates the Enhanced Elongation of Primary Roots Induced by N-3-Oxo-Hexanoyl-Homoserine Lactone in Arabidopsis thaliana. MOLECULAR PLANT-MICROBE INTERACTIONS : MPMI 2016; 29:774-785. [PMID: 27604593 DOI: 10.1094/mpmi-03-16-0063-r] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
N-acyl-homoserine lactones (AHL) are the quorum-sensing (QS) signal molecules used by many gram-negative bacteria to coordinate their collective behavior in a population. Recent evidence demonstrates their roles in plant root growth and defense responses. AtMYB44 is a multifaceted transcriptional factor that functions in many physiological processes in plants but whether AtMYB44 modulates the plant response to AHL with aspects of primary root elongation remains unknown. Here, we show that the expression of AtMYB44 was upregulated upon treatment with N-3-oxo-hexanoyl-homoserine lactone (3OC6-HSL). The stimulatory effect of 3OC6-HSL on primary root elongation was abolished in the AtMYB44 functional-deficiency mutant atmby44. In contrast, an enhanced promoting-impact of 3OC6-HSL on primary root growth was observed in AtMYB44-overexpressing plant MYB44OTA. Cellular analysis indicated that the prolonged primary root elicited by 3OC6-HSL is the consequence of increased cell division in the meristem zone and enhanced cell elongation in the elongation zone, and AtMYB44 may act as a positive regulator in this process. Furthermore, we demonstrated that AtMYB44 might participate in the 3OC6-HSL-mediated primary root growth via regulating the expression of cytokinin- and auxin-related genes. The data establish a genetic connection between the regulatory role of AtMYB44 in phytohormones-related gene expression and plant response to the bacterial QS signal.
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Affiliation(s)
- Qian Zhao
- 1 Biology Institute, Hebei Academy of Sciences; and
- 2 Hebei Engineering and Technology Center of Microbiological Control on Main Crop Disease, 46th South Street of Friendship, Shijiazhuang, 050051, China
| | - Man Li
- 1 Biology Institute, Hebei Academy of Sciences; and
| | - Zhenhua Jia
- 1 Biology Institute, Hebei Academy of Sciences; and
- 2 Hebei Engineering and Technology Center of Microbiological Control on Main Crop Disease, 46th South Street of Friendship, Shijiazhuang, 050051, China
| | - Fang Liu
- 1 Biology Institute, Hebei Academy of Sciences; and
- 2 Hebei Engineering and Technology Center of Microbiological Control on Main Crop Disease, 46th South Street of Friendship, Shijiazhuang, 050051, China
| | - Hong Ma
- 1 Biology Institute, Hebei Academy of Sciences; and
- 2 Hebei Engineering and Technology Center of Microbiological Control on Main Crop Disease, 46th South Street of Friendship, Shijiazhuang, 050051, China
| | - Yali Huang
- 1 Biology Institute, Hebei Academy of Sciences; and
- 2 Hebei Engineering and Technology Center of Microbiological Control on Main Crop Disease, 46th South Street of Friendship, Shijiazhuang, 050051, China
| | - Shuishan Song
- 1 Biology Institute, Hebei Academy of Sciences; and
- 2 Hebei Engineering and Technology Center of Microbiological Control on Main Crop Disease, 46th South Street of Friendship, Shijiazhuang, 050051, China
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96
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Genome-wide identification of cassava R2R3 MYB family genes related to abscission zone separation after environmental-stress-induced abscission. Sci Rep 2016; 6:32006. [PMID: 27573926 PMCID: PMC5004182 DOI: 10.1038/srep32006] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2016] [Accepted: 08/01/2016] [Indexed: 11/09/2022] Open
Abstract
Cassava plants (Manihot esculenta Crantz) resist environmental stresses by shedding leaves in leaf pulvinus abscission zones (AZs), thus leading to adaptation to new environmental conditions. Little is known about the roles of cassava R2R3 MYB factors in regulating AZ separation. Herein, 166 cassava R2R3 MYB genes were identified. Evolutionary analysis indicated that the 166 R2R3 MYB genes could be divided into 11 subfamilies. Transcriptome analysis indicated that 26 R2R3 MYB genes were expressed in AZs across six time points during both ethylene- and water-deficit stress-induced leaf abscission. Comparative expression profile analysis of similar SOTA (Self Organizing Tree Algorithm) clusters demonstrated that 10 R2R3 MYB genes had similar expression patterns at six time points in response to both treatments. GO (Gene Ontology) annotation confirmed that all 10 R2R3 MYB genes participated in the responses to stress and ethylene and auxin stimuli. Analysis of the putative 10 R2R3 MYB promoter regions showed that those genes primarily contained ethylene- and stress-related cis-elements. The expression profiles of the genes acting downstream of the selected MYBs were confirmed to be involved in cassava abscission zone separation. All these results indicated that R2R3 MYB plays an important regulatory role in AZ separation.
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97
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98
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Yang J, Worley E, Ma Q, Li J, Torres‐Jerez I, Li G, Zhao PX, Xu Y, Tang Y, Udvardi M. Nitrogen remobilization and conservation, and underlying senescence-associated gene expression in the perennial switchgrass Panicum virgatum. THE NEW PHYTOLOGIST 2016; 211:75-89. [PMID: 26935010 PMCID: PMC6680227 DOI: 10.1111/nph.13898] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/2015] [Accepted: 01/14/2016] [Indexed: 05/19/2023]
Abstract
Improving nitrogen (N) remobilization from aboveground to underground organs during yearly shoot senescence is an important goal for sustainable production of switchgrass (Panicum virgatum) as a biofuel crop. Little is known about the genetic control of senescence and N use efficiency in perennial grasses such as switchgrass, which limits our ability to improve the process. Switchgrass aboveground organs (leaves, stems and inflorescences) and underground organs (crowns and roots) were harvested every month over a 3-yr period. Transcriptome analysis was performed to identify genes differentially expressed in various organs during development. Total N content in aboveground organs increased from spring until the end of summer, then decreased concomitant with senescence, while N content in underground organs exhibited an increase roughly matching the decrease in shoot N during fall. Hundreds of senescence-associated genes were identified in leaves and stems. Functional grouping indicated that regulation of transcription and protein degradation play important roles in shoot senescence. Coexpression networks predict important roles for five switchgrass NAC (NAM, ATAF1,2, CUC2) transcription factors (TFs) and other TF family members in orchestrating metabolism of carbohydrates, N and lipids, protein modification/degradation, and transport processes during senescence. This study establishes a molecular basis for understanding and enhancing N remobilization and conservation in switchgrass.
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Affiliation(s)
- Jiading Yang
- Plant Biology Divisionthe Samuel Roberts Noble FoundationArdmoreOK73401USA
- BioEnergy Sciences Center (BESC)Oak Ridge National LaboratoryOak RidgeTN37831USA
| | - Eric Worley
- Plant Biology Divisionthe Samuel Roberts Noble FoundationArdmoreOK73401USA
- BioEnergy Sciences Center (BESC)Oak Ridge National LaboratoryOak RidgeTN37831USA
| | - Qin Ma
- Department of Plant ScienceSouth Dakota State UniversityBrookingsSD57007USA
| | - Jun Li
- Plant Biology Divisionthe Samuel Roberts Noble FoundationArdmoreOK73401USA
| | - Ivone Torres‐Jerez
- Plant Biology Divisionthe Samuel Roberts Noble FoundationArdmoreOK73401USA
| | - Gaoyang Li
- Department of Biochemistry and Molecular BiologyUniversity of GeorgiaAthensGA30602USA
| | - Patrick X. Zhao
- Plant Biology Divisionthe Samuel Roberts Noble FoundationArdmoreOK73401USA
| | - Ying Xu
- BioEnergy Sciences Center (BESC)Oak Ridge National LaboratoryOak RidgeTN37831USA
- Department of Biochemistry and Molecular BiologyUniversity of GeorgiaAthensGA30602USA
| | - Yuhong Tang
- Plant Biology Divisionthe Samuel Roberts Noble FoundationArdmoreOK73401USA
- BioEnergy Sciences Center (BESC)Oak Ridge National LaboratoryOak RidgeTN37831USA
| | - Michael Udvardi
- Plant Biology Divisionthe Samuel Roberts Noble FoundationArdmoreOK73401USA
- BioEnergy Sciences Center (BESC)Oak Ridge National LaboratoryOak RidgeTN37831USA
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99
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Shen C, Yang Y, Liu K, Zhang L, Guo H, Sun T, Wang H. Involvement of endogenous salicylic acid in iron-deficiency responses in Arabidopsis. JOURNAL OF EXPERIMENTAL BOTANY 2016; 67:4179-93. [PMID: 27208542 DOI: 10.1093/jxb/erw196] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
Several phytohormones have been demonstrated to be involved in iron (Fe) homeostasis. We took advantage of a salicylic acid (SA) biosynthesis defective mutant phytoalexin deficient 4 (pad4: T-DNA Salk_089936) to explore the possible effects of endogenous SA on the morphological and physiological responses to Fe deprivation. The morphological and physiological analysis was carried out between Col-0 and the pad4 mutant. Under an Fe-deficiency treatment, Col-0 showed more severe leaf chlorosis and root growth inhibition compared with the pad4 mutant. The soluble Fe concentrations were significantly higher in pad4 than in Col-0 under the Fe-deficiency treatment. Fe deficiency significantly induced SA accumulation in Col-0 and the loss-of-function of PAD4 blocked this process. The requirement of endogenous SA accumulation for Fe-deficiency responses was confirmed using a series of SA biosynthetic mutants and transgenic lines. Furthermore, a comparative RNA sequencing analysis of the whole seedling transcriptomes between Col-0 and the pad4 mutant was also performed. Based on the transcriptome data, the expression levels of many auxin- and ethylene-response genes were altered in pad4 compared with Col-0. Fe deficiency increases SA contents which elevates auxin and ethylene signalling, thereby activating Fe translocation via the bHLH38/39-mediated transcriptional regulation of downstream Fe genes.
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Affiliation(s)
- Chenjia Shen
- College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou 310036, China
| | - Yanjun Yang
- College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou 310036, China
| | - Kaidong Liu
- Life Science and Technology School, Lingnan Normal University, Zhanjiang, Guangdong 524048, China
| | - Lei Zhang
- Department of Plant Pathology, North Carolina State University, Raleigh, NC 27607, USA
| | - Hong Guo
- College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou 310036, China
| | - Tao Sun
- College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou 310036, China
| | - Huizhong Wang
- College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou 310036, China
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100
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Aleman F, Yazaki J, Lee M, Takahashi Y, Kim AY, Li Z, Kinoshita T, Ecker JR, Schroeder JI. An ABA-increased interaction of the PYL6 ABA receptor with MYC2 Transcription Factor: A putative link of ABA and JA signaling. Sci Rep 2016; 6:28941. [PMID: 27357749 PMCID: PMC4928087 DOI: 10.1038/srep28941] [Citation(s) in RCA: 123] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2016] [Accepted: 06/06/2016] [Indexed: 01/30/2023] Open
Abstract
Abscisic acid (ABA) is a plant hormone that mediates abiotic stress tolerance and regulates growth and development. ABA binds to members of the PYL/RCAR ABA receptor family that initiate signal transduction inhibiting type 2C protein phosphatases. Although crosstalk between ABA and the hormone Jasmonic Acid (JA) has been shown, the molecular entities that mediate this interaction have yet to be fully elucidated. We report a link between ABA and JA signaling through a direct interaction of the ABA receptor PYL6 (RCAR9) with the basic helix-loop-helix transcription factor MYC2. PYL6 and MYC2 interact in yeast two hybrid assays and the interaction is enhanced in the presence of ABA. PYL6 and MYC2 interact in planta based on bimolecular fluorescence complementation and co-immunoprecipitation of the proteins. Furthermore, PYL6 was able to modify transcription driven by MYC2 using JAZ6 and JAZ8 DNA promoter elements in yeast one hybrid assays. Finally, pyl6 T-DNA mutant plants show an increased sensitivity to the addition of JA along with ABA in cotyledon expansion experiments. Overall, the present study identifies a direct mechanism for transcriptional modulation mediated by an ABA receptor different from the core ABA signaling pathway, and a putative mechanistic link connecting ABA and JA signaling pathways.
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Affiliation(s)
- Fernando Aleman
- Division of Biological Sciences, Cell and Developmental Biology Section, University of California San Diego, La Jolla, California, USA
| | - Junshi Yazaki
- Plant Biology Laboratory, Genomic Analysis Laboratory, The Salk Institute for Biological Studies, La Jolla, California, 92037 USA
| | - Melissa Lee
- Division of Biological Sciences, Cell and Developmental Biology Section, University of California San Diego, La Jolla, California, USA
| | - Yohei Takahashi
- Division of Biological Sciences, Cell and Developmental Biology Section, University of California San Diego, La Jolla, California, USA
- Division of Biological Science, Graduate School of Science, Nagoya University, Nagoya 464-8602, Japan
| | - Alice Y. Kim
- Plant Biology Laboratory, Genomic Analysis Laboratory, The Salk Institute for Biological Studies, La Jolla, California, 92037 USA
| | - Zixing Li
- Division of Biological Sciences, Cell and Developmental Biology Section, University of California San Diego, La Jolla, California, USA
| | - Toshinori Kinoshita
- Division of Biological Science, Graduate School of Science, Nagoya University, Nagoya 464-8602, Japan
- Institute of Transformative Bio-Molecules (WPI-ITbM), Nagoya University, Nagoya 464-8602, Japan
| | - Joseph R. Ecker
- Plant Biology Laboratory, Genomic Analysis Laboratory, The Salk Institute for Biological Studies, La Jolla, California, 92037 USA
- Howard Hughes Medical Institute, The Salk Institute for Biological Studies, La Jolla, California, 92037 USA
| | - Julian I. Schroeder
- Division of Biological Sciences, Cell and Developmental Biology Section, University of California San Diego, La Jolla, California, USA
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