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

与同倍物种相比，因为与基因组加倍相关的染色数目的变化,多倍物种很容易判断。

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，在二倍水平上选育水稻无融和生殖种的难度较大，而在多倍水平筛选水稻无融和生殖新种已成为水稻无融和生殖研究新的生长点。