三种沙蜥核型的比较研究  

A COMPARATIVE STUDY ON THE KARYOTYPE OF THREE SPECIES IN Phrynocephalus(Agamidae)

作　　者：曾晓茂[1] 王跃招[1] 刘志君[1] 余平[1] 

机构地区：[1]中国科学院成都生物研究所

出　　处：《Zoological Research》1994年第2期80-84,共5页动物学研究（英文）

基　　金：国家自然科学基金

摘　　要：本文报道了白条沙蜥Ｐｈｒｙｎｏｃｅｐｈａｌｕｓａｌｂｏｌｉｎｅａｔｕｓ、东疆沙蜥Ｐ．ｇｒｕｍｇｒｉｚｉｍａｌｏｉ及西藏沙蜥Ｐ．ｔｈｅｏｂａｌｄｉ的核型，西藏沙蜥２ｎ＝２２Ｉ＋２６ｍ，ＮＦ＝４８，其余二者２ｎ＝２２Ｉ＋２４ｍ，ＮＦ＝４６。与同属已知其它的核型进行了比较。沙蜥属中至少存在２ｎ＝４６和２ｎ＝４８两种核型类群，二者可能与“沙蜥属物种形成的两个起源中心”的假说相关。讨论了沙蜥属中的核型演化趋势，并与同科其它属的核型进行了比较。The karyotypes of Phrynocephalus alboineatus,P.grumgrizimaloi and P.theobaldi were reported used by the method of chromosome preparation directly of marrow cells.P.theobaldi had 2 n=22I+26 m with NF= 48. the others had 2 n=22I+24 m with NF=46.The karyotypes of three species were compared with those of other species in the same genus. It was speculated that there were at least two karyotype-group in Phrynocephalus, furthermore, the existence of two karyotype-group was possibly associated with the hypothesis given by Ananjeva in 1992 of two originating centers of Phrynocephalus.The species originated from“Central Asia”,center mostly belong to the first karyotype-group having 2 n=46=22I+24 m with NF=46 whereas those from 2“Middle Asia”Center belong to the second karyotype-group having 2 n=48=22I+26 m with NF=48.The tendency of karyotype evolution in Phrynocephalus was discussed. It was considered the ancients of Phrynocephalus having karyotype, 2n=48, then changed and divided to two karyotype-branch, 2n=46 and 2 n=48. Among them, P.grumgrizimaloi,P.helioscopus,P.axillaris, P. versicolor and P. mystaceus were the derivated species.The difference between the karyotypes of the two populations in P.grumgrizimaloi was possibly revealed the geographical divergence of their genetic construction. The karyotypes of Phrynocephalus genus comparing with other genera in Agamidae proved the primitive taxonomical position in the family.

关 键 词：沙蜥属 染色体组型 遗传学 

分 类 号：Q959.603[生物学—动物学]