Jager_etal_08_physplant.pdf (147.05 kB)
Do brassinosteroids mediate the water stress response?
journal contribution
posted on 2023-05-16, 23:01 authored by Jager, C, Symons, GM, John RossJohn Ross, James ReidJames ReidBrassinosteroids (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 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 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 plant’s response to water stress.
History
Publication title
Physiologia PlantarumVolume
133Pagination
417-425ISSN
0031-9317Department/School
School of Natural SciencesPublisher
Wiley-Blackwell MunksgaardPlace of publication
DenmarkRepository Status
- Restricted