In contrast to homoploid hybrid species,polyploid species are easily diagnosed because of chromosome number changes associated with genome doubling.

与杂合体物种相比，因为与基因组加相关的染色体数目的变化,杂合体物种很容易判断。

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，在二体水平上选育水稻生殖种质的难度较大，而在体水平筛选水稻生殖新种质已成为水稻生殖研究新的生长点。