The New Variation in the Promoter Region of FLOWERING LOCUS T Is Involved in Flowering in Brassica rapa

文献类型： 外文期刊

第一作者： Wei, Qingzhen

作者： Wei, Qingzhen;Hu, Tianhua;Bao, Chonglai;Wang, Jinglei;Pang, Hongtao;Hu, Haijiao;Yan, Yaqin;Wang, Wuhong;Xu, Xinfeng;Liu, Tongkun;Tian, Zhen

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关键词： B; rapa ssp; chinensis; flowering time; quantitative trait locus; FLOWERING LOCUS T; promoter region

期刊名称：GENES （ 影响因子：4.141； 五年影响因子：4.474 ）

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年卷期： 2022 年 13 卷 7 期

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收录情况： SCI

摘要： Flowering time is an important agronomic trait in Brassica rapa and has a wide range of variation. The change from vegetative to reproductive development is a major transition period, especially in flowering vegetable crops. In this study, two non-heading Chinese cabbage varieties with significantly different flowering times, Pak-choi (B. rapa var. communis Tesn et Lee) and Caitai (B. rapa var. tsaitai Hort.), were used to construct segregated F-2 populations. The bulk-segregant approach coupled with whole genome re-sequencing was used for QTL sequencing (QTL-seq) analysis to map flowering time traits. The candidate genes controlling flowering time in B. rapa were predicted by homologous gene alignment and function annotation. The major-effect QTL ft7.1 was detected on chromosome A07 of B. rapa, and the FT family gene BrFT was predicted as the candidate gene. Moreover, a new promoter regional difference of 1577 bp was revealed by analyzing the sequence of the BrFT gene. The promoter region activity analysis and divergent gene expression levels indicated that the difference in the promoter region may contribute to different flowering times. These findings provide insights into the mechanisms underlying the flowering time in Brassica and the candidate genes regulating flowering in production.

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