UMR RPB (CIRAD, IRD, Université Montpellier II), IRD—Institut de Recherche pour le Développement, BP 64501, 34394 Montpellier Cedex 5, France.
J Hered. 2013 Jul-Aug;104(4):459-64. doi: 10.1093/jhered/est025. Epub 2013 Apr 17.
Genome evolution rates can vary considerably among plants. In particular, a correlation has often been reported between the evolution rate and annual/perennial habit, possibly associated with differences in generation time. For example, among the rosid species whose genome is fully sequenced, Vitis vinifera, a perennial species, was shown to have the genome that evolved the slowest. In order to extend knowledge of evolution rates to the asterid clade, one of the two major clades of core eudicotyledonous, the protein evolution rates in three asterid species, one perennial (Coffea canephora) and two annual species (Solanum lycopersicum and Mimulus guttatus), were investigated and compared with V. vinifera. Significant differences were observed among these species, and the proteins that evolved the most slowly were those of V. vinifera. Among the species belonging to the asterid clade, C. canephora appears to have evolved more slowly than the others. These findings are consistent with a correlation between perennial habit and slow evolution rates. The C. canephora genome seems to be an appropriate model for paleogenomic studies of asterids.
基因组进化速率在植物中差异很大。特别是，进化速率与一年生/多年生习性之间通常存在相关性，这可能与世代时间的差异有关。例如，在全基因组测序的蔷薇目物种中，多年生物种葡萄(Vitis vinifera)的基因组进化最慢。为了将进化速率的知识扩展到核心真双子叶植物的两个主要分支之一的菊分支，对三个菊分支物种（一种多年生物种（咖啡 Cof f ea canephora）和两种一年生物种（番茄 Solanum lycopersicum 和金光菊 Mimulus guttatus）的蛋白质进化速率进行了研究，并与葡萄进行了比较。在这些物种中观察到了显著的差异，进化最慢的蛋白质是葡萄的蛋白质。在属于菊分支的物种中，咖啡似乎比其他物种进化得更慢。这些发现与多年生习性和缓慢进化速率之间的相关性一致。咖啡的基因组似乎是菊分支古基因组研究的合适模型。
