数字农科院2.0

Inferring The Evolutionary Mechanism Of T.he Chloroplast Genome Size B y Comparing Wholechloroplast Genome Sequences In Seed Plants

文献类型： 外文期刊

作者： 郑晓明;;王君瑞;;冯雳;;逄洪波;;齐兰;;李静;;孙妍;;乔卫华;;杨庆文

作者机构：

期刊名称： Scientific Reports

ISSN： 2045-2322

年卷期： 2017 年 7 卷

页码：

收录情况： JCR（2021版）

摘要： The chloroplast genome originated from photosynthetic organisms and has retained the core genes that mainly encode components of photosynthesis. However, the causes of variations in chloroplast genome size in seed plants have only been thoroughly analyzed within small subsets of spermatophytes. In this study, we conducted the first comparative analysis on a large scale to examine the relationship between sequence characteristics and genome size in 272 seed plants based on crossspecies and phylogenetic signal analysis. Our results showed that inverted repeat regions, large or small single copies, intergenic regions, and gene number can be attributed to the variations in chloroplast genome size among closely related species. However, chloroplast gene length underwent evolution affecting chloroplast genome size in seed plants irrespective of whether phylogenetic information was incorporated. Among chloroplast genes, atpA, accD and ycf1 account for 13% of the variation in genome size, and the average Ka/Ks values of homologous pairs of the three genes are larger than 1. The relationship between chloroplast genome size and gene length might be affected by selection during the evolution of spermatophytes. The variation in chloroplast genome size may influence energy generation and ecological strategy in seed plants.

分类号：

  • 相关文献
作者其他论文 更多>>