甘蓝型油菜PEBP基因家族的鉴定与表达分析

植物磷脂酰乙醇胺结合蛋白(phosphatidylethanolamine-bindingprotein,PEBP)基因对于控制开花时间具有重要作用。油菜作为世界上最重要的油料作物之一,与模式植物拟南芥具有相似的开花习性。但有关油菜开花基因的功能研究相对较少。本研究利用拟南芥PEBP基因家族蛋白序列在油菜基因组内进行BlastP分析,获得油菜PEBP家族成员,并对其进行基因结构分析、motif预测、复制事件、进化树构建、选择压力分析和组织表达分析。结果表明,共有26个油菜PEBP基因成员得到鉴定,大部分成员含有4个外显子和3个内含子, motif-1和motif-2是PEBP成员的特征基序,超过76.9%的成员属于片段复制扩增事件。进化树分析显示, PEBP分为3个亚家族,基于转录组测序的组织表达数据表明油菜26个PEBP成员具有非常明显的组织表达特性。以上研究结果,极大丰富了我们对甘蓝型油菜开花基因及调控模式的认识,为进一步的分子育种提供了理论基础。

Identification and expression analysis of PEBP gene family in oilseed rape

The plant phosphatidylethanolamine-binding protein (PEBP) genes play an important role in controlling flowering time. Rapeseed, as one of the most important oil crops in the world, has similar flowering habits with Arabidopsis thaliana. In this study, the PEBP family protein sequences of A. thaliana were used to perform BlastP analysis in the rapeseed genome. The members of the rape PEBP family were obtained, and the gene structure analysis, motif prediction, duplication analysis, phylogenetic tree construction, selective pressure analysis and tissue expression analysis were carried out on the family members. A total of 26 rapeseed PEBP gene members were identified, and most of them contained four exons and three introns, and motif-1 and motif-2 were the characteristics of PEBP members. Over 76.9% members were segmental duplicated. Phylogenetic tree analysis showed that PEBP was divided into three subfamilies. The tissue-specifics analysis based on RNA-Seq data showed that 26 PEBP members of rapeseed had very obvious tissue expression characteristics. All these results greatly enrich our understandings of flowering genes and regulation patterns in Brassica napus, and provide a theoretical basis for further molecular breeding in B. napus.