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

ABSTRACT: 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.

SUBMITTER: Wang JC

PROVIDER: S-EPMC3733163 | biostudies-literature | 2013 Aug

REPOSITORIES: biostudies-literature

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

Wang Jie-Chen JC Xu Heng H Zhu Ying Y Liu Qiao-Quan QQ Cai Xiu-Ling XL

Journal of experimental botany 20130711 11

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 sta ...[more]

PMID: 23846875

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Dataset Information

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

Publications

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

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