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Six offspring in each of 24 families and their parents in Japanese pear were evaluated regarding the fruit ripening time. Analysis of variance for the offspring, which estimated betweenand within-family variance, and the regression of the mean value in a full-sib family on the mid-parental value (MP) revealed that the genetic differences among families could be explained mostly by MP, indicating that they were under additive genetic control. Genotypic values of offspring in a family were assumed to be normally distributed around the regression line with the sum of within-family genetic variance and the variance due to the deviation of the family-mean from the regression line. Based on the parental mean performance of 10 fruit on a single tree for six years, the coefficient of regression of mean values in a full-sib family on MP was 0.8072 ± 0.02 (SE), and the proportion of offspring with genotypic values leading to ripening earlier than middle-August was estimated at 7 and 0.7% for the two sets in the case of MP = 2.7 and 3.55, respectively.

engeigaku kenkyuu

Estimation of the Proportion of Offspring with Ripening Time Genotypic Values Exceeding a Given Critical Selection Value in Japanese Pear Cross-breeding