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以携带有抗白粉病基因Pm2 1的小麦 -簇毛麦 6VS/ 6AL易位系 92R139、92R0 89等为供体亲本 ,以丰产但不抗病的 4185等品种为轮回亲本 ,通过回交进行抗病基因的转移。分析了供体亲本及回交后代穗部性状的变化 ,分析了双亲与后代在株高、株型、穗长、抗病性、抽穗期上的变化。结果表明 ,易位系的穗部性状有位于不同染色体上的多个基因控制。易位系的抗病性与黑芒基因并不连锁 ,抗白粉病为显性性状。 3个组合的F1代均表现出较强的杂种优势 ,随回交代数的增加 ,后代性状与轮回亲本趋于一致 ,回交 4代后农艺性状基本与轮回亲本一致
Wheat-Hamster 6VS / 6AL translocation line 92R139,92R0 89 which carries powdery mildew resistance gene Pm21 was used as the donor parent, and the 4185 and other varieties with high yield but not disease resistance were reincarnated by backcross Disease gene transfer. The changes of panicle traits in donor and backcross progeny were analyzed. The changes of plant height, plant type, panicle length, disease resistance and heading date of parents and offspring were analyzed. The results showed that the panicle traits have multiple genes located on different chromosomes. The resistance of the translocation line is not linked to the black mantle gene, and the resistant powdery mildew is the dominant trait. The F1 generation of the three combinations showed strong heterosis. With the increase of backcross generation number, the offspring traits tended to be consistent with the reincarnated parents. The agronomic traits of four generations after backcrossing basically agrees with the recurrent parents