棕色田鼠XO雌体育性研究

STUDIES ON FERTILITY OF XO FEMALES IN THEMANDARIN VOLE, MICROTUS MANDARINUS

通过对棕色田鼠外形特征、卵巢切片、怀胎和生产雌鼠染色体鉴定等方面研究，证实了该鼠ＸＯ雌鼠可孕，并具有生殖能力。染色体鉴定表明，ＸＸ雌体中的两条Ｘ性染色体，一条为Ｍ类型，另一条为ＳＭ类型；ＸＯ雌体中的Ｘ性染色体为Ｍ类型。所以ＸＯ雌体的生育能力可能与Ｘ（Ｍ）染色体有关，其上可能存在雌性育性基因。Ｘ染色体在三种类型（ＸＸ、ＸＯ、ＸＹ）个体中呈特征性分布及ＸＯ雌体高比例存在使棕色田鼠成为哺乳动物ＸＯ雌体育性研究的理想实验动物。

This paper forms the judgement that XO females in Mandarin vole (Microrus mandarinus) have the capability of pregnancy and reproduction according to studies on the exterior characterization, transversal sections of ovary,and identification of chromosomes of pregnant or mother Mandarin vole.The identification of chromosomes shows that one of the two X chromosomes in XX female is type M which is different from the other X chromosome (which is SM);the X chromosomes in XO females are all type M. Hence,the reproductive capacity of XO females may be related to the X(M) chromosomes. The two X chromosomes have characteristic distribution in three kinds of individuals (XX,XO,XY) and the incidence of XO seems to be unusually high in the Mandarin vole. The mandarin vole are ideal experimental animals for fertility research in XO females of mammals.