The Brassica rapa FLC homologue FLC2 is a key regulator of flowering time, identified through transcriptional co-expression networks

文献类型： 外文期刊

第一作者： Xiao, Dong

作者： Xiao, Dong;Zhao, Jian J.;Basnet, Ram K.;Zhang, Ning W.;Bucher, Johan;Lin, Ke;Bonnema, Guusje;Xiao, Dong;Hou, Xi L.;Zhao, Jian J.;Basnet, Ram K.;Bonnema, Guusje;Carpio, Dunia P. D.;Cheng, Feng;Wang, Xiao W.;Bonnema, Guusje

作者机构：

关键词： Brassica rapa;candidate gene mapping;expression quantitative trait loci (eQTL);FLOWERING LOCUS C (FLC);flowering time;gene expression networks;genome triplication

期刊名称：JOURNAL OF EXPERIMENTAL BOTANY （ 影响因子：6.992； 五年影响因子：7.86 ）

ISSN： 0022-0957

年卷期： 2013 年 64 卷 14 期

页码：

收录情况： SCI

摘要： The role of many genes and interactions among genes involved in flowering time have been studied extensively in Arabidopsis, and the purpose of this study was to investigate how effectively results obtained with the model species Arabidopsis can be applied to the Brassicacea with often larger and more complex genomes. Brassica rapa represents a very close relative, with its triplicated genome, with subgenomes having evolved by genome fractionation. The question of whether this genome fractionation is a random process, or whether specific genes are preferentially retained, such as flowering time (Ft) genes that play a role in the extreme morphological variation within the B. rapa species (displayed by the diverse morphotypes), is addressed. Data are presented showing that indeed Ft genes are preferentially retained, so the next intriguing question is whether these different orthologues of Arabidopsis Ft genes play similar roles compared with Arabidopsis, and what is the role of these different orthologues in B. rapa. Using a geneticalgenomics approach, co-location of flowering quantitative trait loci (QTLs) and expression QTLs (eQTLs) resulted in identification of candidate genes for flowering QTLs and visualization of co-expression networks of Ft genes and flowering time. A major flowering QTL on A02 at the BrFLC2 locus co-localized with cis eQTLs for BrFLC2, BrSSR1, and BrTCP11, and trans eQTLs for the photoperiod gene BrCO and two paralogues of the floral integrator genes BrSOC1 and BrFT. It is concluded that the BrFLC2 Ft gene is a major regulator of flowering time in the studied doubled haploid population.

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