文献类型： 外文期刊

作者： Wang, Y. W. ¹ ; Xu, C. ¹ ; Lv, C. F. ¹ ; Wu, M. ¹ ; Cai, X. J. ¹ ; Liu, Z. T. ¹ ; Song, X. M. ¹ ; Chen, G. X. ¹ ; Lv, C. G.;

作者机构： 1.Nanjing Normal Univ, Life Sci Coll, Jiangsu Key Lab Biodivers & Biotechnol, Nanjing 210023, Jiangsu, Peoples R China

2.Nanjing Univ Sci & Technol, Zijin Coll, Nanjing 210023, Jiangsu, Peoples R China

关键词： JIP-test;natural senescence;PSII efficiency;thylakoid membrane

期刊名称：PHOTOSYNTHETICA （ 影响因子：3.189； 五年影响因子：3.38 ）

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收录情况： SCI

摘要： Photosystem II (PSII) photochemistry was examined by chlorophyll (Chl) a fluorescence analysis in high-yield rice LYPJ flag leaves during senescence. Parameters deduced from the JIP-test showed that inhibition of the donor side of PSII was greater than that of the acceptor side in hybrid rice LYPJ. The natural senescence process was accompanied by the increased inactivation of oxygen-evolving complex (OEC) and a lower total number of active reaction centers per absorption. It indicated that the inhibition of electron transport caused by natural senescence might be caused partly by uncoupling of the OEC and/or inactivation of PSII reaction centers. Chl fluorescence parameters analyzed in this study suggested that energy dissipation was enhanced in order to protect senescent leaves from photodamage. Nevertheless, considerably reduced PSI electron transport activity was observed at the later senescence. Thus, natural senescence inhibited OEC-PSII electron transport, but also significantly limited the PSII-PSI electron flow.