石貂的染色体研究

本文对分布在我国的石貂北方亚种染色体进行了较详细的研究。结果表明２ｎ＝３８，核型为１４（Ｍ）＋４（ＳＭ）＋１８（ＳＴ），ＸＹ（Ｍ，Ａ）。Ｃ－带显示该亚种的一些染色体着丝粒区域结构异染色质弱化或消失。Ｎｏ，９染色体的短臂完全异染色质化；Ｘ染色体长臂丰出现插入杂色质带；Ｙ为完全结构异染色质组成。

CHROMOSOME STUDY OF STONE MARTEN(Martes foina intermedia)

The karyotype of Martes foina intermedia were studied by C-banding and silver staining. The number of diploid chromosome is 38. Autosomes consist of 7 pairs of metacentrics, 2 pairs of submetacentrics, 9 pairs of subacrocentrics. Chromosome No.18 has a secondary constriction near by centromere on the long arm. X chromosome is a metacentrics and of a size between that of chromosome No.3 and No.4, and the Y, the smallest acrocentric.The centromeric distribution of heterochromatin has been demonstrated in most of chromosomes. In some of chromosome centromericregions are stained slightly C-bands. Moreover, the constitutive heterochromatin of centromere region of chromosome No.1 is apparently disappeared. The whole short arm of chromosome No.9 is found to be a complete heterochromatin one. The secondary constriction region of chromosome No.18 is with heterochromatin. The uncommon distribution of interstitial heterochromatin has observed on the long arm of X chromosome. Y chromosome is completely C-band positive.There is only one pair of Ag-NORs in the silver-stained karyotype, it is located at the secondary constriction of chromosom No.18. These specific distribution of C-bands and relative to karyotype evolution of Martes foina intermedia were discussed.