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对133个小麦品种间杂交组合的观察结果指出,凡有免疫品种为亲本的组合,其 F_1抗病性表现显性的机率都很高,而其机率的高低又与另一亲本抗病性的强弱呈正相关。对24对正反交组合的 F_1代,8对的 F_2代和2对的 F_3代作比较观察的结果表明用免疫品种作父本与母本,对后代抗病性的表现和分离并无不同影响。根据田间调查结果,看出杂种后代中底部叶片轻微发病的植株其抗病性稳定程度和遗传力低于“全株免疫株”;用底部叶片发病,中上部叶片表现免疫的品种作抗病亲本,F_1代的中下部叶片发病比较普遍;而用全株免疫的品种作抗病亲本,F_1代一般没有发病现象。试验结果证明 F_1代和 F_2代中的“少茎病株”(同一植株中多数分蘖免疫,个别或少数分蘖感病),其后代(F_2和 F_3)分离出的免疫株率与全株免疫株差别不明显。感病分蘖与同株免疫分蘖的后代在抗病性的分离上也无显著差别。石特14×胜利组合 F_2免疫株的后代(F_3)中有15.8%的株系全部植株免疫;“0;”型和“1”型 F_3植株分离出的免疫株率各达到80.3%和55.5%,但汉有出现免疫的株系。
The observation of the cross combinations of 133 wheat cultivars showed that the combination of the immunized cultivars with their own parents had a very high probability of F 1 resistance and the other was highly resistant to the disease resistance of another parent There is a positive correlation between strength and weakness. The comparative analysis of F_1 generation, 8 pairs of F_2 generation and 2 pairs of F_3 generation of 24 pairs of reciprocal crosses showed that the use of immunized species as the male parent and the female parent showed no difference in the performance and isolation of disease resistance in the offspring influences. According to the results of field investigation, it was found that the plant disease resistance stability and heritability of hybrid plants were lower than that of “whole-plant immune strains”; the varieties with the incidence of the bottom leaf and the middle and upper leaves showed immunity as the resistant parent , F_1 generation of lower leaves in the incidence of more common; and the whole plant immune-resistant varieties for disease-resistant parents, F_1 generation generally no incidence. The results showed that the rate of immune strains isolated from the progenies (F_2 and F_3) of the “less-stalk-bearing plants” (most tillers in the same plant, individual or minority tillers) The difference is not obvious. There was no significant difference in the segregation of disease resistance between susceptible tillers and offspring with the same type of immune tillers. 15.8% of the offspring (F_3) of Shitai 14 × Victory combination F_2 immunized strain were all immunized, and the percentages of immunized strains isolated from “0” type and “1” type F 3 plants reached 80.3% and 55.5% , But there are strains of the immune system in Han.