吊竹梅的核型研究

本文首次报道了吊竹梅(Zebrina pendula Schnizl.)核型。其体细胞染色体数目2n=24。具有2对中部着丝点染色体,3对近端部着丝点染色体和7对端部着丝点染色体,未见次缢痕和随体。染色体的长度比为2.58,臂比大于2的百分比为0.25,属Stebbins核型分类的“2B”型。

Karyotype Analysis of Zebrina Pendula Schnizl

This paper present the karyotype of zebrina pendula schnizl. The numer of the somatic chromosome of Z. pendula schnizl, is 2n=24. The somatic complement showed that four chromosomes (the 1, 2th pairs) are metaccntric centromeres, six chromosomes (the 3, 4, 8th pairs) are subterminal centremeres, fourteen chromosomes (the 5, 6, 7, 9, 10, 11, 12th pairs) are telocentric centromeres. No secondary constrictions and SAT-chromosomes have been seen. According to the classification systems given by Levan et al., the karyotype formula of the species is K=2n=24=4m+6st+14T. The ratio of largest to the smallest chromosomes is 2.58. the proportion of the chromosomes with the arm ratios more than 2 is 0.25. According to Stebbins karyotypic asymmetry, this species belong to "2B" type.