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OsbZIP58, a basic leucine zipper transcription factor, regulates starch biosynthesis in rice endosperm

文献类型： 外文期刊

作者： Wang, Jie-Chen 1 ; Xu, Heng 2 ; Zhu, Ying 2 ; Liu, Qiao-Quan 3 ; Cai, Xiu-Ling 1 ;

作者机构： 1.Chinese Acad Sci, Shanghai Inst Biol Sci, Inst Plant Physiol & Ecol, Natl Key Lab Plant Mol Genet, Shanghai 200032, Peoples R China

2.Zhejiang Acad Agr Sci, Inst Virol & Biotechnol, State Key Lab Breeding Base Zhejiang Sustainable, Hangzhou 310021, Zhejiang, Peoples R China

3.Yangzhou Univ, Minist Educ, Key Labs Crop Genet & Physiol Jiangsu Prov & Plan, Yangzhou 225009, Peoples R China

关键词： Endosperm;coordination;OsbZIP58;rice;starch biosynthesis

期刊名称：JOURNAL OF EXPERIMENTAL BOTANY （ 影响因子：6.992； 五年影响因子：7.86 ）

ISSN： 0022-0957

年卷期： 2013 年 64 卷 11 期

页码：

收录情况： SCI

摘要： Starch composition and the amount in endosperm, both of which contribute dramatically to seed yield, cooking quality, and taste in cereals, are determined by a series of complex biochemical reactions. However, the mechanism regulating starch biosynthesis in cereal seeds is not well understood. This study showed that OsbZIP58, a bZIP transcription factor, is a key transcriptional regulator controlling starch synthesis in rice endosperm. OsbZIP58 was expressed mainly in endosperm during active starch synthesis. osbzip58 null mutants displayed abnormal seed morphology with altered starch accumulation in the white belly region and decreased amounts of total starch and amylose. Moreover, osbzip58 had a higher proportion of short chains and a lower proportion of intermediate chains of amylopectin. Furthermore, OsbZIP58 was shown to bind directly to the promoters of six starch-synthesizing genes, OsAGPL3, Wx, OsSSIIa, SBE1, OsBEIIb, and ISA2, and to regulate their expression. These findings indicate that OsbZIP58 functions as a key regulator of starch synthesis in rice seeds and provide new insights into seed quality control.

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