Effects of Exogenous Silicon on Photosynthetic Capacity and Antioxidant Enzyme Activities in Chloroplast of Cucumber Seedlings Under Excess Manganese |
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| Authors: | FENG Jian-peng SHI Qing-hua WANG Xiu-feng |
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| Institution: | 1. Center of Advanced Study in Botany, Banaras Hindu University, Varanasi 221005, India;2. Govt. Ramanuj Pratap Singhdev Post Graduate College, Baikunthpur, Korea-497335, Chhattisgarh, India;3. Ranjan Plant Physiology and Biochemistry Laboratory, Department of Botany, University of Allahabad, Allahabad 211002, India;4. D D Pant Interdisciplinary Research Laboratory, Department of Botany, University of Allahabad, Allahabad 211002, India;5. Laser Spectroscopy Lab, Department of Physics, University of Allahabad, Allahabad 211002, India |
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| Abstract: | 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 Ⅱelectron transport(φPSⅡ),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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| Keywords: | cucumber excess manganese photosynthesis chlorophyll fluorescence chloroplast antioxidant enzymes |
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