1983～1985年间观察了3份 A_2不育系(A_2TAM428,A_2Tx624,A_2Tx3197)与140份品种测交 F_1的自交结实率。结果表明,A_1不育系的恢复系或保持系,基本上也恢复或保持 A_2不育系的不育性;但也发现某些恢复 A_1不育系结实性的中国高梁地方品种和国外高梁品系却保持 A_2不育系的不育性。这证实 A_2不育系的育性反应确实与 A_1不育系不同。产生这种现象的原因是不同细胞质与特定雌雄性诱导基因型互作,修饰基因及环境因素的影响。讨论了利用 A_2不育系的选育途径。 Between 1983 and 1985, the selfing percentages of three A_2 lines (A_2TAM428, A_2Tx624, A_2Tx3197) and 140 F_1 lines were observed. The results showed that the restorer or maintainer of A_1 sterile line basically restored or maintained the sterility of A_2 CMS line. However, it was also found that some Chinese sorghum line breeds and the sorghum line But maintain the sterility of A_2 CMS. This confirms that the A 2 sterile line does not have the same fertility response as the A 1 CMS line. The reason for this phenomenon is the interaction between different cytoplasm and specific male and female induced genotypes, modified genes and environmental factors. Discussed the use of A_2 sterile breeding methods.