期刊
PLANT SCIENCE
卷 210, 期 -, 页码 1-9出版社
ELSEVIER IRELAND LTD
DOI: 10.1016/j.plantsci.2013.05.006
关键词
Soybean; Coronatine; Drought; Antioxidant defense; Photosynthesis
资金
- National High Technology Research and Development Program of China [2011AA10A206]
- Fundamental Research Funds for the Central Universities
Coronatine (COR), a structural and functional mimic of jasmonates, is involved in a wide array of effects on plant development and defence responses. This study was conducted to explore the role of exogenously applied COR in alleviating the adversities of drought stress in soybean. COR treatment markedly increased the activities of antioxidant enzymes and proline content, and reduced the accumulation of malondialdehyde and hydrogen peroxide under drought stress. Thus, COR-treated plants had higher leaf relative water content and lower electrolye leakage, which led to higher chlorophyll content, activities of RuBPCase and PEPCase, and net photosynthetic rate compared to control plants exposed to drought. COR also increased maximal efficiency of PS II photochemical reaction and photochemical quenching coefficient, but decreased non-photochemical quenching coefficient. These beneficial effects led to enhanced photosynthetic performance and the translocation of assimilated C-14 which promoted growth and accumulation of dry biomass in COR-treated soybean plants subjected to drought. Interestingly, COR application did not affect the growth and biomass accumulation under well-watered condition. These results suggested the involvement of COR on improving drought tolerance in soybean by modulating antioxidant systems and membrane stability to maintain higher photosynthetic performance. Crown Copyright (c) 2013 Published by Elsevier Ireland Ltd. All rights reserved.
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