Genetic dissection of flowering time in Brassica rapa responses to temperature and photoperiod

文献类型： 外文期刊

第一作者： Xiao, Dong

作者： Xiao, Dong;Shen, Hao-Ran;Wei, Yan-Ping;Liu, Dong-Rang;Hou, Xi-Lin;Bonnema, Guusje;Zhao, Jian-Jun;Xiao, Dong

作者机构：

关键词： Brassica rapa; Flowering time; QTL mapping; FLOWERING LOCUS C (FLC); Temperature; Photoperiod

期刊名称：PLANT SCIENCE （ 影响因子：4.729； 五年影响因子：5.132 ）

ISSN： 0168-9452

年卷期： 2019 年 280 卷

页码：

收录情况： SCI

摘要： The Brassica rapa (B. rapa) species displays enormous phenotypic diversity, with leafy vegetables, storage root vegetables and oil crops. These different crops all have different flowering time, which determine their growing season and cultivation area. Little is known about the effects of diverse temperature and day-lengths on flowering time QTL associated with FLC paralogues. We phenotyped the flowering time of a doubled haploid population, established from a cross between Yellow sarson and Pak choi under diverse environmental conditions. We identified flowering-time QTL (fQTL) in different photoperiod and temperature regimes in the greenhouse, and studied their colocation with known flowering time genes. As several fQTL colocalized with FLC paralogues, we studied the expression patterns of four FLC paralogues during the course of vernalization in parental lines. Under all environmental conditions tested the major fQTL that mapped to the BrFLC2_A02 locus was detected, however its effect decreased when plants were grown at low temperatures. Another fQTL that mapped to the FLC paralogue, BrFLCS_A03 was also identified under all tested environments, while no fQTL colocated with BrFLC1_A10 or BrFLC3_A03. Furthermore, the vernalization treatment decreased expression of all BrFLC paralogues in the parental lines, and showed the lowest transcript level after 28 days of vernalization. Transcript abundance stayed low after returning the plants for seven days to normal growth temperature. Interestingly, transcript abundance of BrFLC3_A03 and BrFLCS_A03 was repressed much stronger and already reached lowest levels after 14d in the early-flowering type YS-143. This study improves understanding of the effects of day length and vernalization on flowering time in B. rapa and the role of the different BrFLC paralogues therein.

分类号：

  • 相关文献
作者其他论文 更多>>

微信小程序