Genetic analysis of phytoene synthase 1 (Psy1) gene function and regulation in common wheat

文献类型: 外文期刊

第一作者: Zhai, Shengnan

作者: Zhai, Shengnan;Sun, Youwei;Li, Jihu;He, Zhonghu;Xia, Xianchun;Li, Genying;Song, Jianmin;Song, Guoqi;Li, Yulian;Ling, Hongqing;He, Zhonghu

作者机构:

关键词: Carotenoid biosynthesis;RNAi;RNA-Seq;TILLING;Triticum aestivum

期刊名称:BMC PLANT BIOLOGY ( 影响因子:4.215; 五年影响因子:4.96 )

ISSN: 1471-2229

年卷期: 2016 年 16 卷

页码:

收录情况: SCI

摘要: Background: Phytoene synthase 1 (PSY1) is the most important regulatory enzyme in carotenoid biosynthesis, whereas its function is hardly known in common wheat. The aims of the present study were to investigate Psy1 function and genetic regulation using reverse genetics approaches. Results: Transcript levels of Psy1 in RNAi transgenic lines were decreased by 54-76 % and yellow pigment content (YPC) was reduced by 26-35 % compared with controls, confirming the impact of Psy1 on carotenoid accumulation. A series of candidate genes involved in secondary metabolic pathways and core metabolic processes responded to Psy1 down-regulation. The aspartate rich domain (DXXXD) was important for PSY1 function, and conserved nucleotides adjacent to the domain influenced YPC by regulating gene expression, enzyme activity or alternative splicing. Compensatory responses analysis indicated that three Psy1 homoeologs may be coordinately regulated under normal conditions, but separately regulated under stress. The period 14 days post anthesis (DPA) was found to be a key regulation node during grain development. Conclusion: The findings define key aspects of flour color regulation in wheat and facilitate the genetic improvement of wheat quality targeting color/nutritional specifications required for specific end products.

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