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The characteristics of CO_2 assimilation of photosynthesis and chlorophyll fluorescence in transgenic PEPC rice

chinese Science Bulletin 2001年第13期46卷 1080-1084页

作者： jiao demao, li xia, huang xueqing, chi wei, kuang tingyun & ku sb maurice1. institute of agrobiological genetics and physiology, jiangsu academy of agricultural sciences, nangjing 210014, china 2. institute of Botany, the chinese academy of sciences, Beijing 100093, china 3. Botany Department, Washington State University, Pullman, WA 99164-4236, USA institute of agrobiological genetics and physiology Jiangsu Academy of Agricultural Sciences Nangjing China institute of Botany The Chinese Academy of Sciences Beijing China Botany Department Washington State University Pullman USA

With PEPC, PPDK, NADP-ME and PEPC+ PPDK transgenic and untransformed rice (Orysa sativa L.), the activities of related C4 photosynthesis enzymes, the chlorophyll fluorescence parameters, CO2 exchange and other physiological indexes were compared, in which the physiological characteristics of PEPC transgenic rice were mainly studied. The results were as follows: (i) The activities of PEPC in PEPC transgenic rice were 20-fold higher than those in untransformed rice; the light-saturation photosynthetic rates and the carboxylation efficiency of PEPC transgenic rice were increased by 55% and 50% more than those of untransformed rice, respectively, while the CO2 compensation point decreased by 27%. (ii) The PS II photochemical efficiency (Fv/Fm) and photochemical quenching (qp) of transgenic PEPC rice decreased less in comparison with those of untransformed rice after the treatment with high light intensity (3 h) or methyl viologen (MV), a photooxidative reagent, which demonstrated that the tolerance of PEPC

关键词： transgenic rice photosynthetic characteristics photoin-hibition of photosynthesis chlorophyll fluorescence phosphoenopy-ruvate carboxylase (PEPC).

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