Effects of high light stress on chlorophyll-protein complexes of two subspecies of rice

文献类型： 外文期刊

第一作者： Xin, YY

作者： Xin, YY;Feng, LJ;Xu, YN;Jiao, DM;Li, LB;Kuang, TY

作者机构：

关键词： high light stress;subspecies of rice;excitation energy distribution;chlorophyll-protein complex

期刊名称：ACTA BOTANICA SINICA （ 影响因子：0.599； ）

ISSN： 0577-7496

年卷期： 2000 年 42 卷 12 期

页码：

收录情况： SCI

摘要： Influence of high light stress on the photosynthesis of nag leaves of indica subspecies (cv. "Shanyou 63", sensitive to photoinhibition) and japonica subspecies (cv. "Wuyujing", resistant to photoinhibition) of rice ( Oryza sativa L.) was comparatively investigated. In both cultivars of rice, the excitation energy distribution between two photosystems was altered and the excitation energy transfer from light harvesting chlorophyll protein complexes to PS ii was inhibited by high light stress. These decreases were more pronounced in indica rice cultivar as compared to japonica one. The analysis of mild SDS-PAGE showed that in indica rice, high light stress almost disaggregated the trimer of light harvesting chlorophyll protein complexes of PS II (LHC II1). The stress reduced the contents of internal antennae chlorophyll protein complexes of PS II (CPa), light harvesting chlorophyll protein of PS I (CP I a) and Chi a protein complex of PS I reaction center (CP I) as well as dimer of LHC II (LHC II2) in indica rice. In japonica subspecies, however, high light stress depressed the contents of LHC II1, CPa and CP I a, but slightly impacted on CP I content. Moreover, the increase in the contents of monomer of LHC Ii by high light stress was found in both subspecies. In consistent with above results, analysis of polypeptide indicated that the amounts of 27 kD and 25 kD polypeptide of LHC II in particular, as well as that of 21 kD polypeptide of CP I a were reduced by high light stress in both subspecies. It was found that, comparing with japonica rice, the stress pronouncedly diminished 43 kD and 47 kD proteins of Cpa and 23 kD extrisic protein in indica rice.

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