【摘要】 1983～1985年间观察了3份 A₂不育系（A₂TAM428,A₂Tx624,A₂Tx3197）与140份品种测交 F₁的自交结实率。结果表明,A₁不育系的恢复系或保持系,基本上也恢复或保持 A₂不育系的不育性;但也发现某些恢复 A₁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 A₂不育系的不育性。这证实 A₂不育系的育性反应确实与 A₁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 A₂不育系的选育途径。更多还原

【Abstract】 The percent selfed seed set of 140 sorghum F₁ produced by A₂ malesterile lines were evaluated in period 1983～1985.The female of F₁ usedin our experiments were A₂ TAM428,A₂ Tx624 and A₂ Tx3197,themale lines consisted of 25 maintainers of sterility in A₁ male sterilelines,15 restorers of fertility to A₁ male sterile lines,75 local varietiesin China and 25 exotic germplasms of sorghum.Differences among reaction of fertility were determined by comparisons of percent selfed seedset of F₁ from A₂ and A₁ male sterile lines.The results suggested thatmaintainers of A₁ male sterile lines also maintained sterility in A₂ malesterile lines and restorers of A₁ male sterile lines also restored fertilityto hybrids with A₂ cytoplasm.However,we also observed that somelocal varieties of China and exotic germplasms of sorghum which restored fertility to F₁ with milo cytoplasm maintained sterility with A₂,it istrue that reaction of A₂ and A₁ male sterile lines was different.Thereaction of fertility of A₂ and A₁ male sterile lines was similar whenthey were crossed with maintainers or restorers of A₁, but it was different when they crossed with other varieties and germplasms,this reverseperformance can attribute to the interaction between different cytoplasms and inducing genes of specific female or male and to the effectof modifying genes as well as condition elements.The approach of usingA₂ male sterile lines were also discussed.更多还原