云南兔(Lepus comus)的染色体研究

本文以染色体分带技术(G-，C-带和银染色)，对云南兔(Lepus comus)的核型进行了观察分析。结果表明t：2n=48，NF=88。常染色体由6对中着丝粒染色体， 5对亚中着丝粒染色体，10对亚端着丝粒染色体和2对端着丝粒染色体组成；X染色体为亚中着丝粒染色体。除少数几对染色体(Nos．9，14，16，20)着丝粒C-带呈阴性外，其余均呈阳性或浅染，但异染色质的含量差异较大。Ag-NORs的数目为5-6个，分别位于Nos．1 7，19，21。通过与兔科其它属种核型的比较，对其染色体进化作了讨论。

STUDIES ON THE CHROMOSOMES OF YUNNAN HARE (LEPUS COMUS)

The karyotype of Yunnan hare (Lepus comus) has been studied by banding techniques (G-, C-banding) and silver staining. The number of diploid chromosome is 48, autosomes consist of 6 pairs of metacentrics, 5 pairs of submetacentrics, 10 pairs of subtelocentrics and 2 pairs acrobentrics. X is a larger submetacentric. And very faint secondary constrictions is found on pairs 17, 19, 21. The G-banded, C-banded and silver-stained karyotypes have been observed. The chromosomal homologies of genus Lepus are high by comparing their G-banded karyotypes. The centromeric heterochromatin is found in all chromosomes except Nos. 9,14, 16, 20, whereas the centromeric C-bands of Nos. 13, 15, 18 are very fanitly stained. The sequential studies of conventional and silver-stained karyotypes show Ag-NORs at the faint secondary constrictions of Nos. 17, 19, 21. The Polymorphism of Ag-NORs of No.21 is found. And the karyotype evolution of Leporides has been discussed by comparison with other species.