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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

journal contribution
posted on 2023-05-19, 11:19 authored by Frances SussmilchFrances Sussmilch, Atallah, NM, Timothy BrodribbTimothy Brodribb, Banks, JA, McAdam, SAM
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.

Funding

Australian Research Council

History

Publication title

Plant Signaling and Behavior

Volume

12

Issue

9

Article number

e1365210

Number

e1365210

Pagination

1-5

ISSN

1559-2316

Department/School

School of Natural Sciences

Publisher

Taylor & Francis

Place of publication

United States

Rights statement

Copyright 2017 Taylor & Francis Group, LLC

Repository Status

  • Restricted

Socio-economic Objectives

Expanding knowledge in the biological sciences

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