植物LEAFY基因的起源和进化分析  

The origin and evolution of the plant LEAFY gene

作　　者：刘嘉欣 陈志阳 Liu Jiaxin;Chen Zhiyang(Jiangsu Key Laboratory of Crop Genetics and Physiology/Key Laboratory of Plant Functional Genomics of the Ministiy of Education/Jiangsu Key Laboratory of Crop Genomics and Molecular Breeding,Agricultural College of Yangzhou University,Jiangsu Yangzhou 225009)

机构地区：[1]江苏省作物遗传生理重点实验室/植物功能基因组学教育部重点实验室/江苏省作物基因组学与分子育种重点实验室/江苏省粮食作物现代产业技术协同创新中心,扬州大学农学院,江苏扬州225009

出　　处：《科技风》2020年第13期13-15,共3页

摘　　要：植物LEAFY(LFY)基因编码植物特有的一类转录因子,在显花植物营养生长向生殖生长的转变中起了重要作用。本研究采用同源性检索、系统进化分析和正选择作用检测等方法对植物LEAFY基因进行了系统的进化分析,结果发现植物LEAFY基因最早起源于轮藻,并在陆生植物基因组中稳定遗传下来;不同陆生植物基因组的LEAFY基因具有相似的基因结构;单子叶植物的LEAFY基因经历了明显的正选择作用,而玉米和油棕中分别具有2个LEAFY基因,且其中的一个经历了正选择作用,可能与新功能的形成及功能分化有关。The plant LEAFY( LFY) gene encodes a type of plant-specific transcription factors,which plays an important role in the transformation of vegetative to reproductive growth in flowering plants.In this study,a comprehensive analysis of sequence similarity,phylogenetic analysis and positive selection was performed to investigate the molecular evolution of LEAFY genes in plants.The results revealed that the plant LEAFY genes have first emerged in the streptophyte algae,and then were stably inherited in land plant genomes.Gene structure analysis suggested that plant LEAFY genes shared similar gene structure in different genomes of land plants.In addition,LEAFY genes have undergone positive selection in monocots,whereas only one of both two LEAFY genes in Zea mays and Elaeis guineensis were detected under positive selection,respectively,which might be associated with the formation of novel function and functional divergence.

关 键 词：植物 LEAFY基因 系统进化 正选择作用 

分 类 号：Q94[生物学—植物学]