Soybean (Glycine max (L.) Merrill) is a leguminous with annual cycle that has different purposes, among them a growing strand relates to the direct use as food. There is demand for soybean cultivars with this disposition that have resistance to many pathogens and pests. In particular highlight the disease cyst nematode (Heterodera glycines) that causes significant loss in grain yield. In view of this, the purpose of this work is to study the inheritance of resistance to cyst nematode in soybean, as well as an estimate of the number and mode of action of genes involved in resistance to contribute in designing crossings, involving parents in the study, with a higher possibility to accumulating genes that confer resistance to race 3 cyst nematode in soybean. The experiment will be conducted in a acclimatized greenhouse from the Departamento de Produção Vegetal da Faculdade de Ciências Agrárias e Veterinárias, UNESP-Jaboticabal, SP and Empresa de Pesquisa Agropecuária de Minas Gerais, EPAMIG-Uberaba, MG. Will be used contrasting parents being carriers of resistance to race 3 ('BRSMG 810C') and susceptible ('BRSMG 790A' and 'BRSMG 800A'), which show a phenotype favorable for use in human consumption, which will give rise to two populations study. After the hybridization process will be obtained the F1; RC1:1 and RC1:2 generations. This generations and segregating generation F2:3 will be used to study the inheritance of resistance, through the segregation of trait. The assessments will be conducted by nematode scale SCHMITT & SHANNON (1992) and subsequently analyzed by Chi-square (X2) to test the fit to the model proposed for the inheritance. Are also estimated the heritability and some components of variance for a better understanding of plant-parasitic nematodes concerned.
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