When the main agronomic characters of the twin-embryo seedling plants trends to be stable, two lines were selected to study the frequencies of twin-embryo seedlings in different temperatures.

• 在突变单株的纯化过程中对其多胚苗性状的表现进行了观察鉴定。随后，在突变体后代的主要农艺性状趋于稳定时对两个株系在不同温度条件下的多胚苗频率进行了鉴定。