人工诱导培育的四倍体甜菜,种子发芽力和田间出苗率均低于原始的二倍体类型。指出,四倍体甜菜减数分裂产生的异常小孢子的比率远大于二倍体,而且 C_2代与 C_1代比较,减数分裂趋于稳定。Rasmusson J·认为,四倍体甜菜的生活力和生产力只是在 C_6代才达到原始二倍体亲本的水平。温祥报道,从 C_0—C代连续提纯三代,完全可使诱变后代的四倍性稳定下来。总之,人们着重从细胞的 Artificially induced tetraploid beet, seed germination and field emergence rate were lower than the original diploid type. The results showed that the rate of abnormal microspores produced by tetraploid beetle meiosis was much larger than that of diploid, and the meiosis tended to be stable compared with that of C 1 generation. Rasmusson J argues that the viability and productivity of tetraploid beets only reached the level of the original diploid parent on the C 6 generation. Wenxiang reported that continuous purification of three generations from the C_0-C generation can completely stabilize tetraploid offspring. In short, people focus on the cells