Coefficient of Parentage and RFLP Markers: Are They Useful in Predicting Genetic Variance in Soybean Populations?

摘要

Coefficient of parentage (CP) and RFLP genetic-similarity estimates (RFLP-GS) have been proposed as measures of genetic distance to study patterns of diversity within crop species. The coefficient of parentage, also called coancestry, is defined as the probability that a random gene from one individual is identical by descent to a random gene of the other individual. RFLP-GS is defined as the proportion of RFLP bands identical, compared to the total number of bands between two cultivars. In soybean,RFLP-based markers have been efficient in detecting genotypic differences among soybean cultivars, corresponding to genetic differences in the pedigree (Shoemaker, et al., 1992; Keim et al., 1989). However practical application of these measures in plantbreeding remains uncertain. Their ultimate utility depends on their predictive value for parameters of interest, such as genetic variance among inbred lines. The present research was designed to probe the relationship of the CP and RFLP-GS between parents and the genetic variance among their inbred progeny.