二倍体和四倍体栽培苦荞的细胞学比较研究

A cytological study on meiosis of PMCs of diploid and tetraploid tartary buckwheat

观察和统计了二倍体和四倍体苦荞 (Fagopyrum tataricum)花粉母细胞减数分裂过程 TI、T 时期的异常程度及花粉粒败育性等多个指标 ,并比较分析了二倍体和四倍体苦荞在这些指标上的差异显著性。结果显示 :四倍体苦荞的异常 TI细胞频率、异常 T 细胞频率、TI细胞平均微核数、T 细胞平均微核数及花粉败育率均显著高于二倍体苦荞 ,这表明四倍体苦荞的遗传稳定性和花粉可育性都比二倍体苦荞差。

Many parameters of TI and TⅡstages in PMCs meiosis and the rates of defeated pollen grains of diploid tartary buckwheat(Fagopyrum tataricum)and its tetraploid doubling line were analyzed. The results showed that the rate of abnormal diads, the mean of micronuclei per diad, the rate of abnormal tetrads, the mean of micronuclei per tetrad, and the rate of defeated pollen grains in tetraploid tartary buckwheat are all much higher than those in diploid tartary buckwheat, indicating that the genetic stability of tetraploid tartary buckwheat is much lower than the diploid tartary buckwheat.