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Physiological basis of photosynthetic tolerance to photooxidation and shading in rice

文献类型： 外文期刊

作者： Li, X 1 ; Jiao, DM 1 ;

作者机构： 1.Jiangsu Acad Agr Sci, Inst Agrobiol Genet & Physiol, Nanjing 210014, Peoples R China

关键词： photooxidation;shade;rice;PSII photochemical efficiency;RuBisCO

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： Thirty genotypes from rice germplasm were identified under photooxidation and shading condition and divided into four basic types : (1) cultivars tolerant to both photooxidation and shading, (2) cultivars tolerant to photooxidation but sensitive to shading, (3) cultivars tolerant to shading but sensitive to photooxidation, and (3) cultivars sensitive to photooxidation and shading. A comparative study of photosynthetic characteristics of a cultivar (cv. Wuyujing 3) that is tolerant and a cultivar (cv. Xiangxian) that is sensitive to both photoinhibition and shading showed that the photochemical efficiency of PS II (F-v/F-m) and the content of PSII-D1 protein in the tolerant cultivar "Wuyujing 3" decreased less under photoinhibition conditions as compared with "Xiangxian", Under photooxidation conditions, superoxide dismutase was induced rapidly to a higher level and the active oxygen O- built up to a lower level in "Wuyujing 3" than in "Xiangxian". At the same time, the photosynthetic rate decreased by 23% in "Wuyujing 3" vs. 64% in "Xiangxian", Shading (20% natural light) during the booting stage caused only small decreases (7% - 13%) in RuBisCO activity and the photosynthetic rate in "Wuyujing 3" but showed marked decreases (57% - 64%) in "Xiangxian" which corresponded to the decreases in grain yield in the two cultivars (38% and 73%, respectively). The correlation analysis showed that the tolerance to photooxidation is mainly related to PSII-D1 and that to shading is mainly related to RuBisCO activity. This study provided a simple and effective screening method and physiological basis for crop breeding in enhancing tolerance to both high and low radiation.

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