Library Open Repository

Do brassinosteroids mediate the water stress response?

Downloads

Downloads per month over past year

Jager, CE and Symons, GM and Ross, JJ and Reid, JB (2008) Do brassinosteroids mediate the water stress response? Physiologia Plantarum, 133 (2). pp. 417-425. ISSN 0031-9317

[img] PDF
Jager_etal_08_physplant.pdf | Request a copy
Full text restricted

Abstract

Brassinosteroids (BRs) have been suggested to increase the resistance of plants to a variety of stresses, including water stress. This is based on application studies, where exogenously applied bioactive BRs have been shown to improve various aspects of plant growth under water stress conditions. However, it is not known whether changes in endogenous BR levels are normally involved in mediating the plant's response to stress. We have utilized BR mutants in pea (Pisum sativum L.) to determine whether changes in endogenous BR levels are part of the plant's response to water stress and whether low endogenous BR levels alter the plant's ability to cope with water stress. In wild-type (WT) plants, we show that while water stress causes a significant increase in ABA levels, it does not result in altered BR levels in either apical, internode or leaf tissue. Furthermore, the plant's ability to increase ABA levels in response to water stress is not affected by BR deficiency, as there was no significant difference in ABA levels between WT, lkb (a BR-deficient mutant) and lka (a BR-perception mutant) plants before or 14 days after the cessation of watering. In addition, the effect of water stress on traits such as height, leaf size and water potential in lkb and lka was similar to that observed in WT plants. Therefore, it appears that, at least in pea, changes in endogenous BR levels are not normally part of the plant's response to water stress.

Item Type: Article
Keywords: brassinolide; brassinosteroid; castasterone; epibrassinolide; relative water content; wild type.
Journal or Publication Title: Physiologia Plantarum
Page Range: pp. 417-425
ISSN: 0031-9317
Identification Number - DOI: 10.1111/j.1399-3054.2008.01057.x
Additional Information: The definitive published version is available online at: http://interscience.wiley.com
Date Deposited: 30 Nov 2008 23:08
Last Modified: 18 Nov 2014 03:53
URI: http://eprints.utas.edu.au/id/eprint/8074
Item Statistics: View statistics for this item

Repository Staff Only (login required)

Item Control Page Item Control Page