论文部分内容阅读
在网室内用人工接虫的方法对2个抗虫×抗虫,和7个抗虫×感虫大豆杂交组合的F_2群体,及抗虫和感虫亲本,进行了抗性鉴定。根据抗、感亲本的虫食粒率和受害荚率,将F_2代植株的抗虫性分为5级。结果表明,F_2代的抗虫性呈非对称分布,分布高峰的位置因组合而异,且不具有数量性状特有的中心对称分布特征。2个抗×抗组合的F_2代,均分离出一定比例的感虫或高感个体,暗示父母本可能分别带有不同的抗虫基因。同一抗虫亲本与不同的农艺亲本杂交后,F_2代的抗虫性分离比例有较大的差异。抗×抗和抗×感组合的F_2代,都可以分离出较大比例的抗虫单株,超亲现象很普遍,因此,在适宜的接种强度下,抗食心虫性的选择,可能比选择其它数量性状更易奏效。
The F 2 populations of two insect-resistant × insect-resistant and seven insect-resistant × susceptible soybean hybrids were inoculated by artificial insects in the net house, and the resistance of the F 2 population was detected. According to the resistant and susceptible parents’ worm food grain rate and the affected pod rate, the insect resistance of F2 generation plants was divided into 5 grades. The results showed that the F_2 generation showed asymmetric distribution of insect resistance, and the location of the distribution peak varied with the combination and did not have the centrosymmetric distribution characteristic of the quantitative trait. The F2 generation with 2 anti-x-resistant combinations separated a certain percentage of susceptible or susceptible individuals, suggesting that parents may have different insect-resistant genes, respectively. When the same insect-resistant parent was crossed with different agronomic parents, there was a big difference in the proportion of insect-resistant F2 generation. The F2 generation with both anti-x-resistance and anti-x-sensitivity could separate a large proportion of pest resistant plants. The phenomenon of super-progeny was very common. Therefore, the choice of resistance to carpel beetle could be more effective than selecting other Quantitative traits are more effective.