Introduction of genes encoding C4 photosynthesis enzymes into rice plants: physiological consequences

文献类型： 外文期刊

第一作者： Ku, MSB

作者： Ku, MSB;Cho, DH;Li, X;Jiao, DM;Pinto, M;Miyao, M;Matsuoka, M

作者机构：

期刊名称：RICE BIOTECHNOLOGY: IMPROVING YIELD, STRESS TOLERANCE AND GRAIN QUALITY （ 影响因子：1.879； ）

ISSN： 1528-2511

年卷期： 2001 年 236 卷

页码：

收录情况： SCI

摘要： Transgenic rice plants expressing the maize phosphoenolpyruvate carboxylase (PEPC) and pyruvate, orthophosphate dikinase (PPDK) exhibit a higher photosynthetic capacity (up to 35%) than untransformed plants. The increased photosynthetic capacity in these plants is mainly associated with an enhanced stomatal conductance and a higher internal CO(2) concentration. Plants simultaneously expressing high levels of both enzymes also have a higher photosynthetic capacity. The results suggest that both PEPC and PPDK play a key role in organic acid metabolism in the guard cells to regulate stomatal opening. Under photoinhibitory and photooxidative conditions, PEPC transgenic rice plants are capable of maintaining a higher photosynthetic rate, a higher photosynthetic quantum yield by PSII and a higher capacity to dissipate excess energy photochemically and non-photochemically than untransformed plants. Preliminary data from field trials show that relative to untransformed plants, the grain yield is about 10-20% higher in selected PEPC and 30-35% higher in PPDK transgenic rice plants, due to increased tiller number. Taken together, these results suggest that introduction of C4 photosynthesis enzymes into rice has a good potential to enhance its tolerance to stress, photosynthetic capacity and yield.

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