小偃麦与中间偃麦草杂交不亲合性和不育性的探讨

Discussion of Incompatibility and Sterility on Hybridization Between Trititrigiaand Thinopyrum intermedium

远缘杂交遇到的关键问题是可交配性和不育性，为深入了解远缘杂交的可交配性和不育性，探讨了小偃麦与中间偃麦草杂交当代的可交配性和F1～F4的不育性表现。小偃麦与中间偃麦草杂交当代的结实率为10％～39％，F1当年不结实，二至五年生结少量种子，结实率有逐年恢复的倾向；F2～F5分离世代不同类型结实率不同，普通小麦类型、小偃麦类型结实率可达70％～100％，中间偃麦草类型40％～50％，种子饱满度逐代改进。

The key problem which distant hybridization encountered is crossability and sterility, for the irsight of that,the contemporary crossability and sterility expression of F1 -F4 of Trititrigia and Thinopyrum intermedium hybridization were discussed. Seed setting rate of contemporary hybrids for Trititrigia and Thinopyrum intermedium hybrids was 10%;39% ,F1 was sterility in the same year,and with a small amount seed for biennial to 5-year-old, seed setting rate had a tendency to gradually restore. The di（ferent types of hybrid had differ- ent seed setting rate for F2-F5 segregative generation, the seed setting rate of the type common wheat and Trititrigia could reach 70% - 100;, that of Thinopyrum intermediu., was 40% -50%, seed plumpness was gradually improved.