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      Coordination between bZIP28 and HSFA2 in the regulation of heat response signals in Arabidopsis

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          ABSTRACT

          Heat stress can have detrimental effects on yield production worldwide. Although bZIP28 and HSFA2 were identified as putative heat sensors in plants, coordination between them has not been uncovered. In this study, the deficiency in bZIP28 did not affect heat tolerance in plants. However, the plants lacking bZIP28 showed enhanced activation of APXs-, MBF1c-and HSPs-dependent pathways as well as higher level of HsfA2 transcripts and H 2O 2 accumulation, suggesting that these pathways might compensate for the deficiency in bZIP28 during heat stress. In addition, requirement of HSFA2 for the activation of APXs-dependent pathway during heat stress was supported by the analyses of plants lacking HSFA2. Our study demonstrated the flexible mode of heat response pathways involving bZIP28, HSFA2 and ROS-dependent signals.

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          How do plants feel the heat?

          Ron Mittler, Andrija Finka, Pierre Goloubinoff (2012)
          In plants, the heat stress response (HSR) is highly conserved and involves multiple pathways, regulatory networks and cellular compartments. At least four putative sensors have recently been proposed to trigger the HSR. They include a plasma membrane channel that initiates an inward calcium flux, a histone sensor in the nucleus, and two unfolded protein sensors in the endoplasmic reticulum and the cytosol. Each of these putative sensors is thought to activate a similar set of HSR genes leading to enhanced thermotolerance, but the relationship between the different pathways and their hierarchical order is unclear. In this review, we explore the possible involvement of different thermosensors in the plant response to warming and heat stress. Copyright © 2011 Elsevier Ltd. All rights reserved.
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            The zinc-finger protein Zat12 plays a central role in reactive oxygen and abiotic stress signaling in Arabidopsis.

            Sholpan Davletova, Karen Schlauch, Jesse Coutu … (2005)
            Plant acclimation to environmental stress is controlled by a complex network of regulatory genes that compose distinct stress-response regulons. In contrast to many signaling and regulatory genes that are stress specific, the zinc-finger protein Zat12 responds to a large number of biotic and abiotic stresses. Zat12 is thought to be involved in cold and oxidative stress signaling in Arabidopsis (Arabidopsis thaliana); however, its mode of action and regulation are largely unknown. Using a fusion between the Zat12 promoter and the reporter gene luciferase, we demonstrate that Zat12 expression is activated at the transcriptional level during different abiotic stresses and in response to a wound-induced systemic signal. Using Zat12 gain- and loss-of-function lines, we assign a function for Zat12 during oxidative, osmotic, salinity, high light, and heat stresses. Transcriptional profiling of Zat12-overexpressing plants and wild-type plants subjected to H(2)O(2) stress revealed that constitutive expression of Zat12 in Arabidopsis results in the enhanced expression of oxidative- and light stress-response transcripts. Under specific growth conditions, Zat12 may therefore regulate a collection of transcripts involved in the response of Arabidopsis to high light and oxidative stress. Our results suggest that Zat12 plays a central role in reactive oxygen and abiotic stress signaling in Arabidopsis.
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              The roles of ROS and ABA in systemic acquired acclimation.

              Ron Mittler, Eduardo Blumwald (2015)
              Systemic responses to environmental stimuli are essential for the survival of multicellular organisms. In plants, they are initiated in response to many different signals including pathogens, wounding, and abiotic stresses. Recent studies highlighted the importance of systemic acquired acclimation to abiotic stresses in plants and identified several different signals involved in this response. These included reactive oxygen species (ROS) and calcium waves, hydraulic waves, electric signals, and abscisic acid (ABA). Here, we address the interactions between ROS and ABA at the local and systemic tissues of plants subjected to abiotic stress and attempt to propose a model for the involvement of ROS, ABA, and stomata in systemic signaling leading to systemic acquired acclimation.
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                Author and article information

                Journal
                Journal ID (nlm-ta): Plant Signal Behav
                Journal ID (iso-abbrev): Plant Signal Behav
                Journal ID (publisher-id): KPSB
                Journal ID (publisher-id): kpsb20
                Title: Plant Signaling & Behavior
                Publisher: Taylor & Francis
                ISSN (Print): 1559-2316
                ISSN (Electronic): 1559-2324
                Publication date Collection: 2017
                Publication date (Electronic): 5 September 2017
                Publication date PMC-release: 5 September 2017
                Volume: 12
                Issue: 11
                Electronic Location Identifier: e1376159
                Affiliations
                Department of Materials and Life Sciences, Faculty of Science and Technology, Sophia University , Chiyoda-ku, Tokyo, Japan
                Author notes
                CONTACT Nobuhiro Suzuki n-suzuki-cs6@ 123456sophia.ac.jp .7-1 Kioi-Cho, Chiyoda-Ku , Tokyo 102-8554, Japan

                Supplemental data for this article can be accessed on the publisher's website.

                Article
                Publisher ID: 1376159
                DOI: 10.1080/15592324.2017.1376159
                PMC ID: 5703228
                PubMed ID: 28873003
                SO-VID: 08b0777b-3a6e-4b30-9f94-e383767095d2
                Copyright © © 2017 The Author(s). Published with license by Taylor & Francis Group, LLC
                License:

                This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives License ( http://creativecommons.org/licenses/by-nc-nd/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited, and is not altered, transformed, or built upon in any way.

                History
                Date received : 18 August 2017
                Date accepted : 31 August 2017
                Page count
                Figures: 3, Tables: 0, References: 29, Pages: 6
                Categories
                Subject: Short Communication

                ScienceOpen disciplines: Plant science & Botany
                Keywords: arabidopsis bzip28,arabidopsis hsfa2,heat stress,multiprotein bridging factor 1c (mbf1c),reactive oxygen species (ros)
                Data availability:
                ScienceOpen disciplines: Plant science & Botany
                Keywords: arabidopsis bzip28, arabidopsis hsfa2, heat stress, multiprotein bridging factor 1c (mbf1c), reactive oxygen species (ros)

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