野生二粒小麦抗白粉病基因向普通小麦转移的研究

野生二粒小麦(资源代号:AS846)叶鞘被有茸毛,穗轴脆易断;对小麦白粉病、条锈病免疫.普通小麦与其杂交和回交,F₁回交结实率是杂交结实率的3～4倍;野生二粒小麦性状在F₁呈显性,BC₁开始分离;F₃形态指示性状出现中间类型,一直到高代还保留这种类型.形态指示性状与抗白粉性连锁不紧密,不能作为抗白粉性的选择标志.在普通小麦和野生二粒小麦的单交组合里,通过定向选择,选育出了农艺性状好,抗白粉性基本稳定的株系N9134-2-11-1.

Studies on Transfer of the Powdery Mildew Resistant Gene from T.dicoccoides into T.aestivum

One accession of T.dicoccoides,which is immune to powdery mildew and yellow rust,was used in this test.With T.aestivum crossed and backcrossed to the accession of T.dicoccoides,the seed-set of BC₁ is three times higher than that of F₁.The characters of T. dicoccoides,such as hairiness of leaf sheath,fragility of rachies at mat urity and immunity to powdery mildew,are dominance in F₁ and begin to segregate after backcrossing to T.aestivum.The results also showed that the marker traits of T.dicoccoides are not linkage to the powdery mildew resistance.Moreover,by continuing seletion,an excellent line N 9134-2-11-1 with durable resistance to powdery mildew and desirable agronomic characters was obtained from the generation of the combinat ions between T.aestivum and T.dicoccoides.