Increasing maize seed weight by enhancing the cytoplasmic ADP-glucose pyrophosphorylase activity in transgenic maize plants

文献类型： 外文期刊

第一作者： Wang, Zhangying

作者： Wang, Zhangying;Chen, Xiaoping;Wang, Jianhua;Liu, Tingsong;Liu, Yan;Zhao, Li;Wang, Guoying

作者机构：

关键词： glgC16;seed weight;sink strength;starch biosynthesis;Zea mays L

期刊名称：PLANT CELL TISSUE AND ORGAN CULTURE （ 影响因子：2.711； 五年影响因子：2.73 ）

ISSN： 0167-6857

年卷期： 2007 年 88 卷 1 期

页码：

收录情况： SCI

摘要： ADP-glucose pyrophosphorylase (AGPase) plays a key role in regulating starch biosynthesis in cereal seeds and is likely the most important determinant of seed strength. The Escherichia coli mutant glgC gene (glgC16), which encodes a highly active and allosterically insensitive AGPase, was introduced into maize (Zea mays L.) under the control of an endosperm-specific promoter. Developing seeds from transgenic maize plants showed up to 2-4-fold higher levels of AGPase activity in the presence of 5 mM inorganic phosphate (Pi). Transgenic plants with higher cytoplasmic AGPase activity under Pi-inhibitory conditions showed increases (13-25%) in seed weight over the untransformed control. In addition, in all transgenic maize plants, the seeds were fully filled, and the seed number of transgenic plants had no significant difference compared with that of untransformed control. These results indicate that increasing cytoplasmic AGPase activity has a marked effect on sink activity and, in turn, seed weight in transgenic maize plants.

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