Journal
BIOLOGIA PLANTARUM
Volume 56, Issue 1, Pages 192-196Publisher
ACAD SCIENCES CZECH REPUBLIC, INST EXPERIMENTAL BOTANY
DOI: 10.1007/s10535-012-0041-2
Keywords
antioxidative enzymes; brassinosteroids; chlorophyll; lipid peroxidation; membrane permeability; photosystem; proline; reactive oxygen species
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Funding
- National Natural Science Foundation of China [30900172]
- National Outstanding Youth Foundation of China [30625008]
- Major Project of Cultivating New Varieties of Transgenic Organisms [2009ZX08009-029B, 2008ZX08009-003]
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Brassinosteroids (BRs) have been proposed to increase the resistance of plants to drought stress. The effect of foliar application of 0.1 mu M 24-epibrassinolide (EBR) on chlorophyll (Chl) content, photosystem 2 (PS 2) photochemistry, membrane permeability, lipid peroxidation, relative water content (RWC), proline content, and the antioxidant system in drought-stressed Chorispora bungeana plants was investigated. The results showed that polyethylene glycol (PEG) induced water stress decreased RWC, Chl content and variable to maximum Chl fluorescence ratio (F-v/F-m) less in plants pretreated with EBR than in non-pretreated plants. In addition, lipid peroxidation, measured in terms of malondialdehyde content, membrane permeability and proline content in drought-stressed plants were less increased in EBR pretreated plants, while antioxidative enzyme activities and reduced ascorbate and glutathione contents were more increased in EBR pretreated than in non-pretreated plants. These results suggested that EBR could improve plant growth under drought stress
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