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

与同倍杂合物种相比，因为与基因组加倍相关的染数目的变化,倍杂合物种很容易。

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.

要 ： 目前，在二倍水平上选育水稻无融和生殖种质的难度较大，而在倍水平筛选水稻无融和生殖新种质已成为水稻无融和生殖研究新的生长点。