期刊
AGRICULTURAL SCIENCES IN CHINA
卷 8, 期 1, 页码 40-50出版社
ELSEVIER SCI LTD
DOI: 10.1016/S1671-2927(09)60007-9
关键词
cucumber; excess manganese; photosynthesis; chlorophyll fluorescence; chloroplast; antioxidant enzymes
资金
- National Key Technologies R&D Program during the 11th Five-Year Plan period of China [2008BADA4B05]
- Excellent Young Scientist Foundation of Shandong Province, China [2006BS06019]
Effects of silicon on photosynthetic parameters and antioxidant enzymes of chloroplast in cucumber seedlings under excess Mn were studied. Compared with the control, excess Mn significantly inhibited net photosynthetic rate (Pn), stomatal conductance, as well as the maximum yield of the photosystem II photochemical reactions (Fv/Fm) and the quantum yield of photosysytem II electron transport (PSII), application of Si reversed the negative effects of excess Mn. In the further investigation, it was obtained that application of Si significantly increased the activities of enzymes related with ascorbate-glutathione cycle including ascorbate peroxidase (APX), dehydroascorbate reductase (DHAR) and glutathione reductase (GR) in cucumber chloroplast under excess Mn, this could be responsible for the lower accumulation of H2O2 and lower lipid peroxidation of chloroplast induced by Mn, and resulted in keeping higher photosynthesis.
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