PLOSone CO2.pdf (1.93 MB)
Unique responsiveness of angiosperm stomata to elevated CO2 explained by calcium signalling
journal contributionposted on 2023-05-17, 22:10 authored by Timothy BrodribbTimothy Brodribb, McAdam, SAM
Angiosperm and conifer tree species respond differently when exposed to elevated CO2, with angiosperms found to dynamically reduce water loss while conifers appear insensitive. Such distinct responses are likely to affect competition between these tree groups as atmospheric CO2 concentration rises. Seeking the mechanism behind this globally important phenomenon we targeted the Ca2+-dependent signalling pathway, a mediator of stomatal closure in response to elevated CO2, as a possible explanation for the differentiation of stomatal behaviours. Sampling across the diversity of vascular plants including lycophytes, ferns, gymnosperms and angiosperms we show that only angiosperms possess the stomatal behaviour and prerequisite genetic coding, linked to Ca2+-dependent stomatal signalling. We conclude that the evolution of Ca2+-dependent stomatal signalling gives angiosperms adaptive benefits in terms of highly efficient water use, but that stomatal sensitivity to high CO2 may penalise angiosperm productivity relative to other plant groups in the current era of soaring atmospheric CO2.
Australian Research Council
Publication titlePLoS One
Department/SchoolSchool of Natural Sciences
PublisherPublic Library of Science
Place of publicationSan Francisco, USA
Rights statementCopyright 2013 Brodribb, McAdam. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.