作　　者： ; ; ; ;

机构地区： 广西水产研究所

出　　处： 《水生生物学集刊》 1984年第3期313-321,共9页

摘　　要： 三种鱼的二倍体数目完全相同,均为2n=50。三种鱼的核型差异较大,尤其是双亲间的组型在形态上有明显的差异。然而杂交一代的m、sm二组染色体的组型却十分接近母体,这二组的染色体数占了全部染色体总数的88%。杂交一代染色体组型中的st和t二组染色体虽与双亲有所不同,但与双亲中这二组染色体组型的差异来比要小一些。三种鱼的中期分裂相中,未曾发现带有随体的染色体,也未发现与性别有关的异型染色体的存在。 Karyotypes of two cyprinid fishes (Sinilabeo decorus tungting and Cirrhinus molitorella) and their hybrid (F_1) were examined. The results of the karyotypie analysis are presented below:The diploid chromosome numbers of these three fishes are all 50. The karyotype of paternal fish(S. decorus tungting) is composed of 6 metacentric chromosome pairs, 8 submetacentric chromosome pairs, 5 subteloeentrie chromosome pairs and 6 telocentric pairs; while the karyotype of maternal fish (C. molitorella) consists of 10 metacentric chromosome pairs, 13 submetacentric chromosome pairs, 1 subtelocentrie chromosome pair and 1 telocentric pair. It is obvious that the karyotypic chromosome sets of the two parental fishes are different from each other.The karyotype of the hybrid (F_1) is composed of 9 metacentric chromosome pairs, 13 submetacentric chromosome pairs and 3 subtelocentric pairs. It is different from either parental karyotypes. The karyotypic indices and the number of metacentric and submetacentric chromosome in F_1 are nearly equal to those of its maternal fish, chromosome numbers of these two parts amounting to 88% of the total. Thus, F_1 retains most of the chromosome homologous to its maternal fish.Some morphological descriptions on chromosome pairs above mentioned as well as the idiograms established on the basis of their karyotypes are given in this paper likewise.

关 键 词： 湘华鲮 鲮鱼 杂交一代 双亲 染色体组型 比较研究 杂交育种

领　　域： [生物学] [农业科学] [农业科学]