A glutathione S-transferase GhTT19 determines flower petal pigmentation via regulating anthocyanin accumulation in cotton

文献类型： 外文期刊

第一作者： Chai, Qichao

作者： Chai, Qichao;Wang, Xiuli;Gao, Mingwei;Chen, Ying;Zhang, Chao;Jiang, Hui;Wang, Jiabao;Wang, Yongcui;Baltaevich, Ahmedov Miraziz;Zhao, Junsheng;Zhao, Xuecheng;Zhao, Jian;Zheng, Meina;Zhao, Junsheng

作者机构：

关键词： Gossypium; anthocyanin; map-based cloning; GhTT19 allelic variation; transcriptional regulation

期刊名称：PLANT BIOTECHNOLOGY JOURNAL （ 影响因子：13.263； 五年影响因子：11.619 ）

ISSN： 1467-7644

年卷期：

页码：

收录情况： SCI

摘要： Anthocyanin accumulations in the flowers can improve seed production of hybrid lines, and produce higher commodity value in cotton fibre. However, the genetic mechanism underlying the anthocyanin pigmentation in cotton petals is poorly understood. Here, we showed that the red petal phenotype was introgressed from Gossypium bickii through recombination with the segment containing the R-3 (bic) region in the A07 chromosome of Gossypium hirsutum variety LR compared with the near-isogenic line of LW with white flower petals. The cyanidin-3-O-glucoside (Cy3G) was the major anthocyanin in red petals of cotton. A GhTT19 encoding a TT19-like GST was mapped to the R-3(bic) site associated with red petals via map-based cloning, but GhTT19 homologue gene from the D genome was not expressed in G. hirsutum. Intriguingly, allelic variations in the promoters between GhTT19(LW) and GhTT19(LR), rather than genic regions, were found as genetic causal of petal colour variations. GhTT19-GFP was found localized in both the endoplasmic reticulum and tonoplast for facilitating anthocyanin transport. An additional MYB binding element found only in the promoter of GhTT19(LR), but not in that of GhTT19(LW), enhanced its transactivation by the MYB activator GhPAP1. The transgenic analysis confirmed the function of GhTT19 in regulating the red flower phenotype in cotton. The essential light signalling component GhHY5 bonded to and activated the promoter of GhPAP1, and the GhHY5-GhPAP1 module together regulated GhTT19 expression to mediate the light-activation of petal anthocyanin pigmentation in cotton. This study provides new insights into the molecular mechanisms for anthocyanin accumulation and may lay a foundation for faster genetic improvement of cotton.

分类号：

  • 相关文献
作者其他论文 更多>>

微信小程序