This study aimed at verify the behavior of Recombinant Inbreed Lines, resulting of a cross between Hartwig (resistant parental) and EMGOPA-316 (susceptible parental) to NCS soybean nematode (race 1) and to estimate genetic parameters and those of selection progress. Estimated parameters used the mean female index (IF) obtained through the evaluation of 176 F6 lines for NCS resistance. The genotypes were evaluated in greenhouse. The frequency distribution and the variance analyses were performed to estimate the number of segregating loci involved in the resistance to NCS. The selection progress was estimated (i = -2,154) among the lines evaluated using different numbers of repetitions, as well the herdability (h²). It was concluded that: a) The normality distribution of the average IF, as well the estimated herdability and the number o segregation loci indicated the resistance to NCS (race 1) is poligenic; b) Promising NCS resistant lines were found. However, as the resistance test is difficult a larger number of F6 lines and a larger number of repetitions should be evaluated; c) The necessity of correction due to macroenvironment effects increased the bias of the estimatives.
Heterodera glycines; genetic resistance; Glycine max; selection progress
