Double copulation of a female with sterile diploid and polyploid males recovers fertility in Bombyx mori
スポンサーリンク
概要
- 論文の詳細を見る
Silkworm males produce dimorphic sperm, nucleate eupyrene sperm and anucleate apyrene sperm.Apyrene sperm have been speculated to have an assisting role in fertilisation. However, the coexistenceof eupyrene and apyrene sperm in the testis and female reproductive organs has made it difficult todefine the role of apyrene sperm. Polyploid males are highly sterile. Microscopic observation revealedthat the elimination of eupyrene nuclei by peristaltic squeezing caused the sterility of polyploids. Heatshockapplied to pupae of Daizo males (DH) also induced high sterility due to the lack of normal apyrenesperm. When eupyrene sperm of sterile DH males and apyrene sperm of sterile polyploid males weremixed by double copulation, a remarkable increase in fertility of the double-mated females was observed.This finding strongly suggests that the apyrene sperm are indispensable in fertilisation of the silkwormand that polyploid apyrene sperm function as a substitute for diploid sperm. We established an experimentalsystem in which we can separate the two types of sperm for further studies on their functionswithout chemical and/or mechanical treatments.
- Cambridge University Pressの論文
Cambridge University Press | 論文
- Sequence analysis of porcine polymeric immunoglobulin receptor from mammary epithelial cells present in colostrum
- 土木工学のコアとは何か
- Fruit, vegetable and bean intake and mortality from cardiovascular disease among Japanese men and women : the JACC Study
- Intracellular production of adrenal renin in the fetal mouse. An immuno-electron microscopic study
- Retinol binding protein 4 in dairy cows : its presence in colostrum and alteration in plasma during fasting, inflammation, and the peripartum period