Unraveling the puzzle of the origin and evolution of cotton A-genome

Gossypium hirsutum,the most widely planted cotton species,its evolution has long been an unsolved puzzle because of its hybrid origin from D-genome and A-genome species.To better understand the genetic component of cotton,Huang et al.recently sequenced and assembled the first A1-genome G.herbaceum,and updated the A2-genome G.arboreum and(AD)1-genome G.hirsutum.On the basis of the three reference genomes,they resolved existing controversial concepts and provided novel evolutionary insights surrounding the A-genome.

应用RAPD-PCR分析棉花A基因组的起源与进化

应用RAPD -PCR技术对 2 1份棉花材料进行了遗传多样性分析。结果表明 :中棉、草棉与海岛棉、陆地棉 4个栽培种间的平均遗传距离分别为 0 .43 17、0 .3 946、0 .4193、0 .43 18;海岛棉与草棉的A染色体组较接近 ,而陆地棉与中棉的A染色体组相近 ,反映了异源四倍体与二倍体A基因组的进化关系。表明利用RAPD标记 ,通过遗传距离和聚类分析可以阐明棉花种质的亲缘关系。