蔡 华1,2，王荣富
(1. 安徽农业大学 园艺学院, 安徽 合肥 230036;
(2. 安徽科技学院 生命科学院, 安徽 凤阳 233100)
摘 要：对安徽蚌埠地区外来植物加拿大一枝黄花的染色体核型进行了分析。结果如下：该入侵种的染色体数为2n=50，各染色体间形态差异不明显，均为中着丝粒或近中着丝粒染色体，最长与最短染色体相对长度比为1.72，全套染色体未见随体，核型公式为2 n=50=38 m+12 sm+6 Bs，核型类型为较对称的2A型。首次报道了存在于体细胞中的异于常染色体的6个B染色体，这些B染色体在不同细胞中保持恒定的数目，并讨论了B染色体的存在与加拿大一枝黄花在新生境中具有入侵性之间的关系。
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Karyotype Analysis of Solidago Canadensis L. and Preliminary Study on Its B-chromosomes CAI
Hua1,2 , WANG Rong-fu1*
(1. College of Agronomy, Anhui Agricultural University, Hefei 230036, Anhui, China;
2. Life Science College, Anhui Science and Technology University, Fengyang 233100, Anhui, China)
Abstract: The karyotype analysis of exotic plant Solidago Canadensis L. in Bangbu,Anhui province was reported . The results are as follows :the number of chromosomes is 2n = 50 , morphological variations is not obvious to the 25 pairs of chromosomes, with all of them are median and submedian centromeric chromosomes , relative length ratio between the longest chromosome and the shortest one is 1.72, there is no SAT in 50 chromosomes, the karyotype formula is 2n = 50 = 38m +12sm + 6Bs,the karyotype type is 2A. 6 B-chromosomes in somatic cells of Solidago Canadensis L. were firstly reported in this study, the number of B-chromosomes is the same in different cells, the relation between B-chromosome and invisibility of Solidago Canadensis L.in the new habitat was discussed too.
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