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Do brassinosteroids mediate the water stress response?


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

DOI: doi:10.1111/j.1399-3054.2008.01057.x


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 shownto 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 plantís 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 plantís response to water stress and whether low endogenous BR levels alter the plantís 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 plantís 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 ofwatering. In addition, the effect of water stress on traits such as height, leaf size andwater 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 plantís response to water stress.

Item Details

Item Type:Refereed Article
Research Division:Biological Sciences
Research Group:Plant biology
Research Field:Plant physiology
Objective Division:Plant Production and Plant Primary Products
Objective Group:Horticultural crops
Objective Field:Horticultural crops not elsewhere classified
UTAS Author:Jager, C (Dr Corinne Hamilton)
UTAS Author:Symons, GM (Mr Gregory Symons)
UTAS Author:Ross, JJ (Associate Professor John Ross)
UTAS Author:Reid, JB (Professor Jim Reid)
ID Code:55070
Year Published:2008
Web of Science® Times Cited:48
Deposited By:Plant Science
Deposited On:2009-03-04
Last Modified:2009-05-16

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