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ZEITLUPE Promotes ABA-Induced Stomatal Closure in Arabidopsis and Populus
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för fysiologisk botanik. Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Umeå Plant Science Centre (UPSC).
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för fysiologisk botanik. Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Umeå Plant Science Centre (UPSC).
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för fysiologisk botanik. Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Umeå Plant Science Centre (UPSC). Departamento de Biología, Universidad de La Serena, La Serena, Chile.
Umeå Plant Science Centre, Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, Umeå, Sweden.
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2022 (Engelska)Ingår i: Frontiers in Plant Science, E-ISSN 1664-462X, Vol. 13, artikel-id 829121Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Plants balance water availability with gas exchange and photosynthesis by controlling stomatal aperture. This control is regulated in part by the circadian clock, but it remains unclear how signalling pathways of daily rhythms are integrated into stress responses. The serine/threonine protein kinase OPEN STOMATA 1 (OST1) contributes to the regulation of stomatal closure via activation of S-type anion channels. OST1 also mediates gene regulation in response to ABA/drought stress. We show that ZEITLUPE (ZTL), a blue light photoreceptor and clock component, also regulates ABA-induced stomatal closure in Arabidopsis thaliana, establishing a link between clock and ABA-signalling pathways. ZTL sustains expression of OST1 and ABA-signalling genes. Stomatal closure in response to ABA is reduced in ztl mutants, which maintain wider stomatal apertures and show higher rates of gas exchange and water loss than wild-type plants. Detached rosette leaf assays revealed a stronger water loss phenotype in ztl-3, ost1-3 double mutants, indicating that ZTL and OST1 contributed synergistically to the control of stomatal aperture. Experimental studies of Populus sp., revealed that ZTL regulated the circadian clock and stomata, indicating ZTL function was similar in these trees and Arabidopsis. PSEUDO-RESPONSE REGULATOR 5 (PRR5), a known target of ZTL, affects ABA-induced responses, including stomatal regulation. Like ZTL, PRR5 interacted physically with OST1 and contributed to the integration of ABA responses with circadian clock signalling. This suggests a novel mechanism whereby the PRR proteins—which are expressed from dawn to dusk—interact with OST1 to mediate ABA-dependent plant responses to reduce water loss in time of stress.

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Frontiers Media S.A., 2022. Vol. 13, artikel-id 829121
Nyckelord [en]
abiotic stress, abscisic acid, circadian clock, OPEN STOMATA 1, PSEUDO-RESPONSE REGULATORs, stomatal closure, ZEITLUPE
Nationell ämneskategori
Botanik
Identifikatorer
URN: urn:nbn:se:umu:diva-193587DOI: 10.3389/fpls.2022.829121ISI: 000773018600001PubMedID: 35310670Scopus ID: 2-s2.0-85126776986OAI: oai:DiVA.org:umu-193587DiVA, id: diva2:1652345
Forskningsfinansiär
VetenskapsrådetCarl Tryggers stiftelse för vetenskaplig forskning KempestiftelsernaVinnovaForskningsrådet FormasKnut och Alice Wallenbergs StiftelseEU, Europeiska forskningsrådet
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This article is part of the research topic Light-Mediated Regulation of Plant Physiology.

Tillgänglig från: 2022-04-19 Skapad: 2022-04-19 Senast uppdaterad: 2024-01-17Bibliografiskt granskad

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Jurca, ManuelaSjölander, JohanJohansson, MikaelTakata, NaokiBakó, LaszloEriksson, Maria E.

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Jurca, ManuelaSjölander, JohanJohansson, MikaelTakata, NaokiBakó, LaszloEriksson, Maria E.
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Institutionen för fysiologisk botanikUmeå Plant Science Centre (UPSC)
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