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首页> 外文期刊>The New Phytologist >Multiple loci and genetic interactions involving flowering timegenes regulate stem branching among natural variants ofArabidopsis
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Multiple loci and genetic interactions involving flowering timegenes regulate stem branching among natural variants ofArabidopsis

机译：涉及开花时间基因的多个基因座和遗传相互作用调节拟南芥自然变异中的茎分支

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摘要

Shoot branching is a major determinant of plant architecture. Genetic variants for reducedstem branching in the axils of cauline leaves of Arabidopsis were found in some natural accessionsand also at low frequency in the progeny of multiparent crosses. Detailed genetic analysis using segregating populations derived from backcrosses with theparental lines and bulked segregant analysis was used to identify the allelic variation controllingreduced stem branching. Eight quantitative trait loci (QTLs) contributing to natural variation for reduced stembranching were identified (REDUCED STEM BRANCHING 1–8 (RSB1–8)). Genetic analysisshowed that RSB6 and RSB7, corresponding to flowering time genes FLOWERING LOCUS C(FLC) and FRIGIDA (FRI), epistatically regulate stem branching. Furthermore, FLOWERINGLOCUS T (FT), which corresponds to RSB8 as demonstrated by fine-mapping, transgeniccomplementation and expression analysis, caused pleiotropic effects not only on floweringtime, but, in the specific background of active FRI and FLC alleles, also on the RSB trait. The consequence of allelic variation only expressed in late-flowering genotypes revealednovel and thus far unsuspected roles of several genes well characterized for their roles in floweringtime control.
机译：枝条分支是决定植物结构的主要因素。在一些自然品系中发现了拟南芥茎杆叶腋中茎干分支减少的遗传变异，在多亲杂交的子代中也以较低的频率发现。详细的遗传分析使用与亲本系回交产生的分离群体和大量分离子分析来鉴定控制减少的茎分支的等位基因变异。确定了八个有助于自然变异以减少茎分支的数量性状位点（QTL）（茎干分枝减少1-8（RSB1-8））。遗传分析表明，与开花时间基因FLOWERING LOCUS C（FLC）和FRIGIDA（FRI）相对应的RSB6和RSB7在上位性调控茎的分支。此外，FLOWERINGLOCUS T（FT）对应于RSB8，通过精细映射，转基因互补和表达分析证明，不仅对开花时间产生多效性影响，而且在活性FRI和FLC等位基因的特定背景下也对RSB性状产生多效性。等位基因变异的结果仅在晚期开花的基因型中表达，揭示了新奇的现象，因此迄今为止，几个基因的怀疑角色已经得到了很好的表征，它们在开花时间控制中的作用得到了很好的表征。

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