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Abscisic acid (ABA) and key proteins in its perception and signaling pathways are ancient, but their roles have changed through time

Sussmilch, FC ORCID: 0000-0002-8659-1125, Atallah, NM, Brodribb, TJ ORCID: 0000-0002-4964-6107, Banks, JA and McAdam, SAM ORCID: 0000-0002-9625-6750 2017 , 'Abscisic acid (ABA) and key proteins in its perception and signaling pathways are ancient, but their roles have changed through time' , Plant Signaling and Behavior, vol. 12, no. 9 , pp. 1-5 , doi: 10.1080/15592324.2017.1365210.

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Abstract

Homologs of the Arabidopsis core abscisic acid (ABA) signaling component OPEN STOMATA1 (OST1) are best known for their role in closing stomata in angiosperm species. We recently characterized a fern OST1 homolog, GAMETOPHYTES ABA INSENSITIVE ON ANTHERDIOGEN 1 (GAIA1), which is not required for stomatal closure in ferns, consistent with physiologic evidence that shows the stomata of these plants respond passively to changes in leaf water status. Instead, gaia1 mutants reveal a critical role in ABA signaling for spore dormancy and sex determination, in a system regulated by antagonism between ABA and the gibberellin (GA)-derived fern hormone antheridiogen (ACE). ABA and key proteins, including ABA receptors from the PYR/PYL/RCAR family and negative regulators of ABA-signaling from Group A of the type-2C protein phosphatases (PP2Cs), in addition to OST1 homologs, can be found in all terrestrial land plant lineages, ranging from liverworts that lack stomata, to angiosperms. As land plants have evolved and diversified over the past 450 million years, so too have the roles of this important plant hormone and the genes involved in its signaling and perception.

Item Type: Article
Authors/Creators:Sussmilch, FC and Atallah, NM and Brodribb, TJ and Banks, JA and McAdam, SAM
Keywords: abscisic acid (ABA), OST1, fern, evolution, PYL/RCAR, PP2Cs, land plants, sex determination
Journal or Publication Title: Plant Signaling and Behavior
Publisher: Taylor & Francis
ISSN: 1559-2316
DOI / ID Number: 10.1080/15592324.2017.1365210
Copyright Information:

Copyright 2017 Taylor & Francis Group, LLC

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