华南地区3种兔儿风属植物(菊科-帚菊木族)的细胞学研究(英文)  

Cytology in Three Species of Ainsliaea(Asteraceae-Pertyeae)from Southern China

作　　者：任琛[1,2] 袁琼[1] 

机构地区：[1]中国科学院华南植物园,中国科学院植物资源保护与可持续利用重点实验室,广州510650 [2]中国科学院研究生院,北京100049

出　　处：《热带亚热带植物学报》2012年第1期51-57,共7页Journal of Tropical and Subtropical Botany

基　　金：supported by the Natural Science Foundation of Guangdong Province(9151009001000046)

摘　　要：首次报道了华南地区兔儿风属(Ainsliaea DC.)(菊科-帚菊木族Asteraceae-Pertyeae)3种植物共4个居群的染色体数目和核型。其中长穗兔儿风(A.henryi Diels)的染色体数目为2n=24,核型公式为2n=16m+8sm;三脉兔儿风(A.trinervis Y.C.Tseng)的染色体数目为2n=26,核型公式为2n=16m+10sm;莲沱兔儿风(A.ramosa Hemsl.)2个居群的染色体数目均为2n=26,核型公式为2n=26=22m+4sm。所有居群的染色体由大到小逐渐变化,核型没有明显的二型性。这些结果表明兔儿风属植物确有x=12和x=13两个基数,其中x=13可能是该属的原始基数。Chromosome numbers and karyotypes in four populations of three species in the genus Ainsliaea DC. （Asteraceae-Pertyeae） from southern China have been investigated for the first time. The chromosome number of A. henryi Diels was counted to be 2n=24, and the karyotype was formulated as 2n = 16m ＋8sin. The number of A. trinervis Y. C. Tseng was counted to be 2n =26, and the karyotype was formulated as 2n = 16m ＋ 10sm. Both populations ofA. ramosa Hemsl. had 2n =26 and the karyotype of 2n=22m ＋4sin. In all of the populations studied the chromosomes showed a steady gradation in length from the longest to the shortest, with no evidence of bimodality. The results have confirmed the occurrence of two basic chromosome numbers, x = 12 and x = 13, in the genus Ainsliaea, with x = 13 very likely being the primitive number.

关 键 词：兔儿风属 菊科 染色体基数 细胞分类学 核型 

分 类 号：Q943[生物学—植物学]