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Augmentation of abscisic acid (ABA) levels by drought does not induce short-term stomatal sensitivity to CO2 in two divergent conifer species

Citation

McAdam, SAM and Brodribb, TJ and Ross, JJ and Jordan, GJ, Augmentation of abscisic acid (ABA) levels by drought does not induce short-term stomatal sensitivity to CO2 in two divergent conifer species, Journal of Experimental Botany, 62, (1) pp. 195-203. ISSN 0022-0957 (2011) [Refereed Article]


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Licenced under Creative Commons Attribution - NonCommercial 2.5 Generic (CC BY-NC 2.5) http://creativecommons.org/licenses/by-nc/2.5/

DOI: doi:10.1093/jxb/erq260

Abstract

The stomata of conifers display very little short-term response to changes in atmospheric CO2 concentration (Ca), whereas the stomatal responses of angiosperms to Ca increase in response to water stress. This behaviour of angiosperm stomata appears to be dependent on foliar levels of abscisic acid (ABAf). Here two alternative explanations for the stomatal insensitivity of conifers to Ca are tested: that conifers have either low ABAf or a higher or absent threshold for ABA-induced sensitivity. The responsiveness of stomatal conductance (gs) to a sequence of transitions in Ca (386, 100, and 600μmol mol -1) was recorded over a range of ABAf in an angiosperm and two divergent conifer species. The different ABA levels were induced by a mild drought cycle. Although the angiosperm and conifer species showed similar proportional increases in ABAf following drought, conifer stomata remained insensitive to changes in Ca whereas angiosperm stomata showed enhanced sensitivity with increasing ABAf. The conifers, however, had much higher ABAf prior to drought than the angiosperm species, suggesting that non-sensitivity to Ca in these conifers was due to an absent or inactive response/signalling pathway rather than insufficient ABAf. © 2010 The Author.

Item Details

Item Type:Refereed Article
Research Division:Biological Sciences
Research Group:Plant Biology
Research Field:Plant Physiology
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Biological Sciences
UTAS Author:McAdam, SAM (Dr Scott McAdam)
UTAS Author:Brodribb, TJ (Professor Tim Brodribb)
UTAS Author:Ross, JJ (Associate Professor John Ross)
UTAS Author:Jordan, GJ (Professor Greg Jordan)
ID Code:66819
Year Published:2011
Web of Science® Times Cited:25
Deposited By:Plant Science
Deposited On:2011-02-15
Last Modified:2017-04-11
Downloads:391 View Download Statistics

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