Phylogenesis of 48 tobacco germplasms from different countries or regions was analyzed with amplified fragment length polymorphism (AFLP).

摘要利用AFLP技术，对48份不同类型和地的烟草种质的亲缘关系进行了分。

Abstract : It is difficulty to select and breed apomictic germplasm among diploid rices at present, but it has become a hotspot to select and breed apomictic germplasm among polyploid rices.

摘要 ： 目前，在二倍体水平上选育水和生殖种质的难度较大，而在多倍体水平筛选水和生殖新种质已成为水和生殖研究新的生长点。