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 amylopecti

SUBMITTER: Wang JC 

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

REPOSITORIES: biostudies-literature