FLOURY ENDOSPERM8, encoding the UDP-glucose pyrophosphorylase 1, affects the synthesis and structure of starch in rice endosperm

文献类型: 外文期刊

第一作者: Long, Wuhua

作者: Long, Wuhua;Dong, Bangning;Wang, Yihua;Pan, Pengyi;Wang, Yunlong;Liu, Linglong;Chen, Xiaoli;Liu, Xi;Liu, Shijia;Tian, Yunlu;Chen, Liangming;Wan, Jianmin;Wan, Jianmin

作者机构:

关键词: Floury endosperm;Oryza sativa;Starch;UDP-glucose pyrophosphorylase

期刊名称:JOURNAL OF PLANT BIOLOGY ( 影响因子:2.434; 五年影响因子:2.455 )

ISSN: 1226-9239

年卷期: 2017 年 60 卷 5 期

页码:

收录情况: SCI

摘要: Cereal opaque-kernel mutants are ideal genetic materials for studying the mechanism of starch biosynthesis and amyloplast development. Here we isolated and identified two allelic floury endosperm 8 (flo8) mutants of rice, named flo8-1 and flo8-2. In the flo8 mutant, the starch content was decreased and the normal physicochemical features of starch were altered. Map-based cloning and subsequent DNA sequencing analysis revealed a single nucleotide substitution and an 8-bp insertion occurred in UDP-glucose pyrophosphorylase 1 (Ugp1) gene in flo8-1 and flo8-2, respectively. Complementation of the flo8-1 mutant restored normal seed appearance by expressing full length coding sequence of Ugp1. RT-qPCR analysis revealed that Ugp1 was ubiquitously expressed. Mutation caused the decreased UGPase activity and affected the expression of most of genes associated with starch biosynthesis. Meanwhile, western blot and enzyme activity analyses showed the comparability of protein levels and enzyme activity of most tested starch biosynthesis related genes. Our results demonstrate that Ugp1 plays an important role for starch biosynthesis in rice endosperm.

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