| Cite this article: | 张云鹤,高大鹏,王晓蕾,等.盐碱胁迫对水稻苗期光系统Ⅱ性能的影响[J].灌溉排水学报,0,():-. |
| ZHANG Yunhe,GAO Dapeng,WANG Xiaolei,et al.盐碱胁迫对水稻苗期光系统Ⅱ性能的影响[J].灌溉排水学报,0,():-. |
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| Effects of Saline-alkali Stress on the Performance of Photosystem Ⅱ at the Seedling Stage of Rice |
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ZHANG Yunhe, GAO Dapeng, WANG Xiaolei, SHAO xiwen, GUO liying, HUANG Jinrui, GENG Yanqiu
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Jilin Agricultural University
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| Abstract: |
| Abstract: 【Objective】 To clarify the photosynthetic physiological response mechanism of rice seedlings under salt-alkali stress. 【Method】In this experiment, Changbai 9 and Baijing 1 were used as test materials, and 4 concentrations of salt-alkali mixture (NaCl:Na2SO4:Na2CO3:NaHCO3=1:9:1:9) were set at 0, 40, 80 and 120 mmol/L the rapid chlorophyll fluorescence induction kinetic curve was analyzed by JIP-test, and the changes of photosystem Ⅱ of rice seedling leaves under mixed salt-alkali stress were explored. 【Result】When the salt-alkali concentration were at 0-80 mmol/L, the chlorophyll fluorescence kinetic curve of the two rice seedlings was a typical OJIP curve, and the fluorescence intensity of each treatments were significantly different from point J at the same time. When the salt-alkali concentration increased to 120 mmol/L, the OJIP curves of the two varieties gradually became flat from point J to point P, and the fluorescence intensity of point I and point P decreased remarkable compared with the blank control. There was a highly significant non-linear relationship between salinity concentration and performance index PIABS, (φEo, φRo, ψEo), donor-side performance index (WK) and recipient-side performance index (VJ) in Changbai 9 and Baijing1. With the salinity concentration increased, the parameters of water content, chlorophyll a content, chlorophyll b content, maximum photochemical efficiency (FV/FM), quantum yield and efficiency (φEo, φRo, ψEo) and performance index PIABS of rice seedlings of Changbai 9 and Baijing 1 gradually decreased. The parameters such as the donor-side performance index (WK), the acceptor-side performance index (VJ) and the heat dissipation ratio (φDo) gradually increased. The change range of the water content, chlorophyll content and chlorophyll fluorescence parameters of the two rice varieties gradually increased with the increase of the salt-alkali concentration. 【Conclusion】Saline-alkali stress severely damaged the donor/acceptor laterality, especially the acceptor lateral performance VJ, which hinders the electron transmission of rice seedling PSⅡ, decreaseed the quantum yield and the performance of photosystem Ⅱ. And there was a highly significant non-linear relationship between the concentration of saline alkali and the PSII performance index PIABS, VJ, WK and quantum yield. |
| Key words: rice; salt-alkali mixed stress; optical system II |
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