Characteristics of carbon assimilation and tolerance to photo-oxidation in transgenic rice expressing C_4 photosynthesis enzymes
文献类型： 会议论文
第一作者： D-M Jiao
作者： D-M Jiao 1 ; X-Q Huang; X Li; W Chi; T-Y Kuang; Q-D Zhang; MSB Ku;
作者机构： 1.Institute of Agrobiological Genetics and Physiology, Jiangsu Academy of Agricultural Sciences, Nangjing 210014, China
关键词： C_4 photosynthesis enzymes;photosynthetic characteristics;transgenic rice
会议名称： Proceedings 12th international congress on photosynthesis
主办单位：
页码： S33-004/1-S33-004/6
摘要： More than 95 percent of the terrestrial plants, including many agronomically important crop species such as rice, assimilate carbon through the C_3 pathway of photosynthesis. Under current atmospheric conditions, O_2 reduces the photosynthetic capacity in C_3 plants by as much as 30-40 percent due to photorespiration. Under high light, high temperature, and drought conditions, which reduce CO_2 concentration in the leaf, the photosynthetic capacity of C_3 plants would decline further (Ku et al. 1999). In plants that utilize the C_4 photosynthetic pathway, atmospheric CO_2 is initially fixed by PC in the mesophyll cells, which has a high affinity for the substrate, bicarbonate, and is not inhibited by O_2. In addition, the C_4 pathway serves as a "CO_2 pump" to concentrate CO_2 in the leaf and suppress photorespiration. Therefore, photosynthesis by C_4 plants is not limited by atmospheric levels of CO_2 and exhibits a higher photosynthetic efficiency, especially under high light, high temperatureand drought conditions. It was also discovered that enzymes involved in C_4 photosynthesis play important roles in plant defense responses to biotic and abiotic stress (Ku et al. 2000). Thus, overexpression of C_4 photosynthesis enzymes in C_3 plants mayimprove their photosynthetic capacity and tolerance to stress.
分类号： Q94
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Characteristics of carbon assimilation and chlorophyll fluorescence in C_4 photosynthetic enzymes transgenic rice
作者：D-M Jiao;X-Q Huang;X Li;W Chi;T-Y Kuang;Q-D Zhang;MSB Ku
关键词：phosphoenolpyruvate carboxylase (PEPC);photosynthetic characteristics;transgenic rice
