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Cultivar differences in photosynthetic tolerance to photooxidation and shading in rice (Oryza sativa L.)

文献类型： 外文期刊

作者： Jiao, DM 1 ; Li, X 1 ;

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

关键词： chlorophyll;grain;irradiance;net photosynthetic rate;photooxidation;photosynthetic characteristics;photosystems 1 and 2;ribulose-1,5-bisphosphate carboxylase;shoot dry mass;superoxide dismutase

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

ISSN： 0300-3604

年卷期： 2001 年 39 卷 2 期

页码：

收录情况： SCI

摘要： Forty-four genotypes from the rice germplasm were identified under photoinhibition/photooxidation and shade conditions 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 (4) cultivars sensitive to both photooxidation and shading. Photosynthetic characteristics of a cultivar tolerant (cv. Wuyugeng 3) and a cultivar sensitive (cv. Xiangxian) to photooxidation and shading were compared. The photochemical efficiency (F-v/F-m) of photosystem 2 (PS2) and the content of PS2-D1 protein in the tolerant cultivar Wuyugeng 3 decreased less under photooxidative conditions as compared with Xiangxian. Under similar conditions, superoxide dismutase was induced rapidly to a higher activity and the active oxygen (O-) built up to a lower level in Wuyugeng 3 than in Xiangxian. Net photosynthetic rate (P-N) decreased by 23 % in Wuyugeng 3 vs. 64 % in Xiangxian. Shading (80 %) during the booting stage caused only small decreases (7-13 %) in ribulose-1,5-bisphosphate carboxylase activity and P-N in Wuyugeng 3 but severe, decreases (57-64 %) were observed in Xiangxian which corresponded to the decreases in grain yield of the two cultivars. (38 and 73 %, respectively). We describe a simple and effective screening method and physiological basis for breeding crops for enhanced tolerance to both high and low irradiance.

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