Establishment of primary silkworm strain having the capability of pupal diapause

点击翻译按钮获取中文摘要

In order to elucidate genetic mechanisms of nonuniform pupal duration of Bombyx mandarin and establish a pupal diapause strain of B. mori, selection of individuals showing longer pupal durations from the progenies of hybrids between B. mandarin and B. mori has been conducted and resulted in a hybrid strain with nonuniform pupal duration. Segregation patterns of pupal period in reciprocal F1 and BC1 between the hybrid strain and the Daizo strain of B. mori have indicated that interactions of gene(s) on sex (Z) chromosome and recessive gene(s) on autosomes are involved in the nonuniform pupal duration. In addition, PCR analysis of BC1 genome DNA using primers designed for discrimination between chromosomes derived from the hybrid strain and those from the Daizo strain suggested that pupal duration is a quantitative trait determined by the cumulative result of many minor genes (polygenes), some of which are different between males and females.