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What are the evolutionary origins of stomatal responses to abscisic acid in land plants?

Sussmilch, FC ORCID: 0000-0002-8659-1125, Brodribb, TJ ORCID: 0000-0002-4964-6107 and McAdam, SAM ORCID: 0000-0002-9625-6750 2017 , 'What are the evolutionary origins of stomatal responses to abscisic acid in land plants?' , Journal of Integrative Plant Biology, vol. 59, no. 4 , pp. 240-260 , doi: 10.1111/jipb.12523.

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The evolution of active stomatal closure in response to leaf water deficit, mediated by the hormone abscisic acid (ABA), has been the subject of recent debate. Two different models for the timing of the evolution of this response recur in the literature. A single-step model for stomatal control suggests that stomata evolved active, ABA-mediated control of stomatal aperture, when these structures first appeared, prior to the divergence of bryophyte and vascular plant lineages. In contrast, a gradualistic model for stomatal control proposes that the most basal vascular plant stomata responded passively to changes in leaf water status. This model suggests that active ABA-driven mechanisms for stomatal responses to water status instead evolved after the divergence of seed plants, culminating in the complex, ABA-mediated responses observed in modern angiosperms. Here we review the findings that form the basis for these two models, including recent work that provides critical molecular insights into resolving this intriguing debate, and find strong evidence to support a gradualistic model for stomatal evolution.

Item Type: Article
Authors/Creators:Sussmilch, FC and Brodribb, TJ and McAdam, SAM
Keywords: evolution, stomatal responses, abscisic acid, land plants
Journal or Publication Title: Journal of Integrative Plant Biology
Publisher: Wiley-Blackwell Publishing Asia
ISSN: 1672-9072
DOI / ID Number: 10.1111/jipb.12523
Copyright Information:

Copyright 2017 Institute of Botany, Chinese Academy of Sciences

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