In the M2 and M3 generation, the average frequencies of mutation in chionic irradiation had increased by 23% and 70% over the acute irradiation of dry seeds respectively.

• 慢照射M_2、M_3代的平均突变频率比照射种子的分别高23%25；70%25.；照射配子体阶段M_3代突变频率中；分离穗行占3/4以上