团花锦蛇、绿锦蛇和三索锦蛇的核型及Ag-NORs

报道了锦蛇属团花锦蛇（Ｅ．ｄａｖｉｄｉ）、绿锦蛇（Ｅ．ｐｒｖｓｉｎａ）和三索锦蛇（Ｅ．ｒａｄｉａｔａ）３个种的核型和Ａｇ－ＮＯＲｓ，团花锦蛇的型２ｎ＝３６（８Ｖ＋６ｓＶ＋２Ｉ＋２０Ｍ），绿锦蛇的核型２ｎ＝３６（７Ｖ＋７ｓＶ＋２Ｉ＋２０ｍ），三索锦蛇的核型２ｎ＝４０（６Ｖ＋３ｓＶ＋２ｓＩ＋５Ｉ＋２４ｍ）；①团花锦蛇和绿锦蛇的染色体数目和结构与此属大多数咱的相似，；②此种为雄性，未见染色体异型。③Ａｇ

KARYOTYPES AND Ag-NORs OF ELAPHE PRASINA, E. DAVADI AND E. RADIATA ELAPHE (REPTILIA: COLUBRIDAE)

Karyotypes and Ag-NORs of 3 species; Elaphe prasina, E. davadi and E. radiata femalewere reported. The karyotypes of E. prasina and E. davadi were 2n=8V+6sV+2I+20m (male) and 2n=7V+7sV+2sI+20m (female), respectively. The Karyotype of E. radiata was 2n=6V+3sV+2sI+5I+24m. Considering other species in Elaphe, the results suggested that ① the numbers and morphological structures of E. prasina and E. davadi were homomorphic as those of most species in this genus; ② Sex chromosomes of the 3 species were heteromorphic which resulted from Z and W differences in chromosome sizes and centromere positions; ③ The numbers and positions of NORs in the 3 species were different. ④ E. radiata was distinct at chromosomal level. The differences in its karyotype, sex chromosomes and the NORs may suggest abrupt chromosomal event in the evolution of E. radiata. ⑤ The species in Elaphe could be divided into 4 groups including E.radiata as a specific group. Fig 1, Tab 2, Ref 18