中国两种掌突蟾(锄足蟾科Pelobatidae,无尾目Anura)的细胞遗传学研究

本文对分布于云南境内的两种Leptolalax——L.ventripunctatus和L.alpinus的常规Giemsa核型、C-带和Ag-NORs作了研究,结果表明L.ventripunctatus的2n=22,20M 2T,NF=42,1对Ag-NORs位于5(?),并呈现异形现象,该区域亦显C-带正染;L.alpinus 2n=24,14M 4SM 6T,NF=42,1对Ag-NORs位于No.8短臂端部,并有随体联合现象。两种的着丝点区域均呈现C-带正染。

Cytogenetic Studies on two Leptolalax Pelobatoids (Pelobatidae,Anura) from China

The karyotypes, Ag-NORs and C-banding for two Chinese leptolalax pelobatoids (Lep-tolalax ventripunctatus, L. alpinus) collected from Yunnan Province were studied. The results showed that they had 2n = 22(20M 2T), NF = 42, one pair of secondary constriction and Ag-NORs located on 5q, all centromeric regions of the genome presented C-positive staining, also on the 5q for Leptolalax ventripunctatus. And 2n = 24(14M 4SM 6T), NF = 42, one pair of Ag-NORs and secondary constriction located on 8p, on which the satellite association occu-red and all the centromeric regions of their chromosomes were positive in C-banding stain in L. alpinus. It is indicated that the centromeric fussion may take place in the karyotypic change proccess. In addition, the size of heteromorphism of Ag-NORs in L. ventripunctatus has been discovered.No heteromorphic sex chromosomes were discovered in L. alpinus based on the analysis of karyotype and banding techniques.