Characterization of a C-4 maize pyruvate orthophosphate dikinase expressed in C-3 transgenic rice plants
文献类型: 外文期刊
第一作者: Zhang, Jianfu
作者: Zhang, Jianfu;Bandyopadhyay, A.;Sellappan, Krisnan;Datta, K.;Datta, Swapan K.;Zhang, Jianfu;Datta, K.;Datta, Swapan K.;Zhang, Jianfu;Xie, Hua'an;Zhang, Jianfu;Xie, Hua'an;Zhang, Jianfu;Wang, Guoying;Zhang, Jianfu;Wang, Guoying
作者机构:
关键词: Indica rice IR64;Maize (Zea mays);photosynthesis;PPDK (pyruvate orthophosphate dikinase);C4 rice
期刊名称:AFRICAN JOURNAL OF BIOTECHNOLOGY ( 影响因子:0.573; 五年影响因子:0.794 )
ISSN: 1684-5315
年卷期: 2010 年 9 卷 2 期
页码:
收录情况: SCI
摘要: Pyruvate orthophosphate dikinase (PPDK) is a key enzyme in plants that utilize the C-4 photosynthetic pathway to fix CO2. The enzymatic reaction catalyzed by PPDK is critically controlled by light and is one of the rate-limiting steps of the C-4 pathway. The intact maize (Zea mays) C-4-PPDK gene, containing its own promoter, terminator sequences and exon/intron structure was introduced into rice (Oryza sativa L. Indica "IR64"), a C-3 plant. Expression of C-4-PPDK in most transgenic rice lines resulted in increased CO2 assimilation rates compared to untransformed control plants. Most of the transformants showed higher photosynthetic activities than that of wild-type plant. Total nitrogen in the flag leaves of C-4-PPDK transgenics was analyzed. Resu(l)ts showed an increase in total nitrogen compared to untransformed control plants suggesting that C-4-PPDK expression in rice promoted nitrogen absorption from the soil. In addition, the photosynthesis rate of some transgenic IR64 lines was also increased in the greenhouse. Molecular analysis revealed that the intact PPDK gene integrated in the rice genome and affected the phenotypes of plants particularly tillers and enhanced yield of transgenic IR64 rice plants in the greenhouse.
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