| Soybean Pod Borer[Leguminivora glycinivorella (Mats.)] is a kind of leading insect pest to soybean in Northeast of China. It damaged not only the yield but also the quality of the soybean. Breeding borer-resistance varieties is an economical and convenient method to manage this kind of pest. Breeding new borer-resistance varieties must rely on some properties of soybean. At the same time the inheritance law of borer-resistance must be definitized to provide the method of borer-resistance breeding.This paper is tending to further discuss the borer-resistance properties of soybean, and the inheritance law of borer-resistance. Materials in the year of 2002 and 2003 were used as the research target. Several materials resistant to soybean pod borer after through appraisals of several years were used to make positive and negative crosses. Some morphological properties, ecological properties and bio-chemical properties in different generations were examined that whether or not they were correlated to borer-resistance. According to the representation of resistance and susceptibility to soybean pod borer, the resistance standard of this experiment was set up. Based on this standard, the F2 generation with different resistant ability was separated into several groups. And the separate ratio of F2 generation was examined by the aptness test of genotype. As the same time, the heritability of borer-resistance was carried out.Some certain materials must be destined as the standard varieties of resistance and susceptibility. But the standard should not be the same under different experimental condition and different materials. So a new standard fit for this experiment was set up.The material 8004 was planting later than ever so that it had a sensitive period to pro- sperous period of soybean pod borer. But it stilled appeared resistance to pod borer. It shows that beside ecological resistance, it must has other resistant methods to pod borer. The high of soybean stem, the color of the pod pubescence, the weight of 100 seeds, the protein and fat content of seeds were newly found to correlated to borer-resistant ability. Certain same properties was found different effect in different generation. Some properties appeared apparent in parental generation were found inapparent in hybridization generations. Parts of properties in hybridization generations showed largely difference to parental generation. It shows that the gene which control this properties maybe has been separated. It also shows that it is not comprehensive to judge the resistant ability just only by little amount of properties of parental generation.The resistant ability of F1 generation which came from positive and negative crosses is nearly the same. It shows that the gene control the resistance ability may be the nuclear gene. But in F2 generation group, the resistant ability was apparent separated. Supposing there were two pair of genes control the resistance after analyzing by Paragraph-Analysis Method. After classified the F2 individuals into several groups, the ratio of separation was found that nearly 9:6:1. The accordant level of theoretic separated ratio and the practical separated ratio is higher than 95% according to χ2 aptness test. And it was apt to the genetic separate mode of the accumulate effect of two pairs of independent dominant genes. The heritability of borer- resistance was higher than 70%.Candidate: Liu YangSpeciality: Agricultural Entomology & Pest ManagementSupervisors: Prof. Zhao KuiJunAssociate Prof. Wang JiAn... |
