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Abstract

Stomatal pores with apertures that can be adjusted by changes in guard cell turgor have facilitated plant success in dry environments. We explore their evolutionary origins, considering recent findings from bryophytes. Unlike vascular plant stomata, which close to prevent water loss, bryophyte stomata become locked open to promote spore desiccation. We find that the families of ion channels, known to control stomatal movements in angiosperms, are ancient and represented across extant land plants. However, although angiosperm guard cells express specific ion channel genes, none appear specifically expressed in stomata‐bearing moss tissues. Given the evolutionary shift in stomatal function from promotion to prevention of water loss, we postulate that ion channels adopted guard cell‐specific functions after the divergence of bryophytes.

Item Type:	Article
Authors/Creators:	Sussmilch, FC and Roelfsema, MRG and Hedrich, R
Keywords:	evolution, guard cell, hydroactive, ion channels, land plants, osmotic adjustment, stomata, turgor
Journal or Publication Title:	New Phytologist
Publisher:	Blackwell Publishing Ltd
ISSN:	0028-646X
DOI / ID Number:	10.1111/nph.15593
Copyright Information:	© 2018 The Authors. New Phytologist © 2018 New Phytologist Trust. This is the peer reviewed version of the following article: Sussmilch, F.C., Roelfsema, M.R.G. and Hedrich, R. (2019), On the origins of osmotically driven stomatal movements. New Phytol, 222: 84-90., which has been published in final form at https://doi.org/10.1111/nph.15593. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.
Related URLs:	Google Scholar: Sussmilch, FC UTAS Profile: Sussmilch, FC
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