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STUDY ON THE MORPHOLOGY OF SEX CHROMOSOMES PAIRING OF THE SYNAPTONEMAL COMPLEXES IN MANDARIN VOLE (MICROTUS MANDARINUS)

GU Wei  WANG Tingzheng  ZHU Bicai   

  • Online:2006-06-12 Published:2008-07-07

棕色田鼠性染色体联会复合体配对的形态学研究

顾  蔚, 王廷正, 朱必才   

  1. 陕西师范大学生命科学学院 , 西安

Abstract: Synaptonemal complexes (SC) of mandarin vole ( Microtus mandarinus ) have been analyzed by electron microscopy with surface-spread and silver-stained preparation. Sex chromosome axes are deep dyed andsynapsis in early pachtene. In middle pachtene the almost whole Y is fully paired with about three-eighth the X and X axis forms a hairpin-likefold. The disappearance of sex chromosome is forestalled as compared with autosomal SC. Mechanism of homologous and nonhomologous pairing ofsex chromosome has been discussed.

Key words: Mandarin vole( Microtus mandarinus ), Synaptonemal complex, Sex chromosomes pairing

摘要: 以界面铺展——硝酸银染色方法制备棕色田鼠性染色体联会复合体标本, 电镜观察了性染色体联会复合体的形成过程。性染色体轴深染加粗, 在早粗线期开始联会; 中粗线期 Y轴以其全长与X轴约3/8 配对, X轴形成发夹状结构; 晚粗线期先于常染色体解联会。并对性染色体间同源性与非同源性配对机制作了探讨。

关键词: 棕色田鼠, 联会复合体, 性染色体配对