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      The OsABF1 transcription factor improves drought tolerance by activating the transcription of COR413-TM1 in rice

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          Abstract

          OsABF1 mediates drought tolerance by directly up-regulating the expression of drought-associated genes, including COR413-TM1, and forms a complex feedback circuit in the drought/abscisic acid signaling pathway.

          Abstract

          Water deprivation causes substantial losses in crop yields around the world. In this study, we show that when overexpressed in transgenic rice ( Oryza sativa), the bZIP transcription factor OsABF1 confers distinctly different drought-tolerance phenotypes when tethered to the transcriptional activator VP16 versus the transcriptional repressor EAR. We performed chromatin immunoprecipitation sequencing (ChIP-seq) and RNA sequencing (RNA-seq) assays on transgenic rice lines and determined that OsABF1 binds to DNA sequences containing an ACGT core motif. Analysis of the overlap between the RNA-sequencing and chromatin immunoprecipitation-sequencing data identified 242 OsABF1 target genes involved in multiple aspects of the drought response. Overexpression of one of these genes, COR413-TM1, which encodes a putative thylakoid membrane protein, resulted in a drought-tolerance phenotype without obvious side effects. In addition, OsABF1 directly regulates the expression of the protein phosphatase 2C ( OsPP48 and OsPP108) and bZIP ( OsbZIP23, OsbZIP46, and OsbZIP72) genes, thus forming a complex feedback circuit in the drought/abscisic acid signaling pathway.

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          Abscisic acid inhibits type 2C protein phosphatases via the PYR/PYL family of START proteins.

          Sang-Youl Park, Pauline Fung, Noriyuki Nishimura … (2009)
          Type 2C protein phosphatases (PP2Cs) are vitally involved in abscisic acid (ABA) signaling. Here, we show that a synthetic growth inhibitor called pyrabactin functions as a selective ABA agonist. Pyrabactin acts through PYRABACTIN RESISTANCE 1 (PYR1), the founding member of a family of START proteins called PYR/PYLs, which are necessary for both pyrabactin and ABA signaling in vivo. We show that ABA binds to PYR1, which in turn binds to and inhibits PP2Cs. We conclude that PYR/PYLs are ABA receptors functioning at the apex of a negative regulatory pathway that controls ABA signaling by inhibiting PP2Cs. Our results illustrate the power of the chemical genetic approach for sidestepping genetic redundancy.
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            Regulators of PP2C phosphatase activity function as abscisic acid sensors.

            Yue Wen Ma, Izabela Szostkiewicz, Arthur Korte … (2009)
            The plant hormone abscisic acid (ABA) acts as a developmental signal and as an integrator of environmental cues such as drought and cold. Key players in ABA signal transduction include the type 2C protein phosphatases (PP2Cs) ABI1 and ABI2, which act by negatively regulating ABA responses. In this study, we identify interactors of ABI1 and ABI2 which we have named regulatory components of ABA receptor (RCARs). In Arabidopsis, RCARs belong to a family with 14 members that share structural similarity with class 10 pathogen-related proteins. RCAR1 was shown to bind ABA, to mediate ABA-dependent inactivation of ABI1 or ABI2 in vitro, and to antagonize PP2C action in planta. Other RCARs also mediated ABA-dependent regulation of ABI1 and ABI2, consistent with a combinatorial assembly of receptor complexes.
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              Monitoring the expression profiles of 7000 Arabidopsis genes under drought, cold and high-salinity stresses using a full-length cDNA microarray.

              Motoaki Seki, Mari Narusaka, Junko Ishida … (2002)
              Full-length cDNAs are essential for functional analysis of plant genes in the post-sequencing era of the Arabidopsis genome. Recently, cDNA microarray analysis has been developed for quantitative analysis of global and simultaneous analysis of expression profiles. We have prepared a full-length cDNA microarray containing approximately 7000 independent, full-length cDNA groups to analyse the expression profiles of genes under drought, cold (low temperature) and high-salinity stress conditions over time. The transcripts of 53, 277 and 194 genes increased after cold, drought and high-salinity treatments, respectively, more than fivefold compared with the control genes. We also identified many highly drought-, cold- or high-salinity- stress-inducible genes. However, we observed strong relationships in the expression of these stress-responsive genes based on Venn diagram analysis, and found 22 stress-inducible genes that responded to all three stresses. Several gene groups showing different expression profiles were identified by analysis of their expression patterns during stress-responsive gene induction. The cold-inducible genes were classified into at least two gene groups from their expression profiles. DREB1A was included in a group whose expression peaked at 2 h after cold treatment. Among the drought, cold or high-salinity stress-inducible genes identified, we found 40 transcription factor genes (corresponding to approximately 11% of all stress-inducible genes identified), suggesting that various transcriptional regulatory mechanisms function in the drought, cold or high-salinity stress signal transduction pathways.
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                Author and article information

                Journal
                Journal ID (nlm-ta): J Exp Bot
                Journal ID (iso-abbrev): J. Exp. Bot
                Journal ID (publisher-id): exbotj
                Title: Journal of Experimental Botany
                Publisher: Oxford University Press (UK )
                ISSN (Print): 0022-0957
                ISSN (Electronic): 1460-2431
                Publication date (Print): 20 July 2017
                Publication date (Electronic): 12 August 2017
                Publication date PMC-release: 12 August 2017
                Volume: 68
                Issue: 16
                Pages: 4695-4707
                Affiliations
                [1 ]Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, China
                [2 ]College of Agricultural Sciences, Heilongjiang Bayi Agricultural University, Daqing, China
                Author notes

                These authors contributed equally to this article.

                Author information
                http://orcid.org/0000-0002-8686-8024
                http://orcid.org/0000-0002-5641-8161
                http://orcid.org/0000-0002-5836-2333
                Article
                Publisher ID: erx260
                DOI: 10.1093/jxb/erx260
                PMC ID: 5853872
                PubMed ID: 28981779
                SO-VID: f40852cd-0891-490f-9a5d-023d4767eb09
                Copyright © © The Author 2017. Published by Oxford University Press on behalf of the Society for Experimental Biology.
                License:

                This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

                History
                Date received : 26 April 2017
                Date accepted : 21 July 2017
                Page count
                Pages: 13
                Funding
                Funded by: National Natural Science Foundation of China 10.13039/501100001809
                Award ID: 31422041
                Award ID: 31371649
                Award ID: 3157101834
                Categories
                Subject: Research Papers
                Subject: Plant-Environment Interactions

                ScienceOpen disciplines: Plant science & Botany
                Keywords: bzip,cor413-tm1,drought tolerance,osabf1,rice,transcription factor
                Data availability:
                ScienceOpen disciplines: Plant science & Botany
                Keywords: bzip, cor413-tm1, drought tolerance, osabf1, rice, transcription factor

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