玉龙雪山野生观赏植物羊齿天门冬的核型报道及B染色体观察

Karyotype Analysis and B Chromosome Observation of Wild Ornamental Plants Asparagus filicinus in the Yulong Snow Mountain

[目的]研究野生观赏植物羊齿天门冬的核型组成。[方法]采用常规压片法,对玉龙雪山产野生观赏植物羊齿天门冬进行染色体观察,并统计分析染色体相对长度、绝对长度、染色体类型、核型不对称性、着丝粒指数CI值等指标,总结出羊齿天门冬的核型特征。[结果]羊齿天门冬为二倍体植物,核型公式为2n=2x=20=10m+10sm,核型类型为2B型,同时观察发现具有B染色体,核型数据为首次报道。[结论]该研究为天门冬属植物细胞地理学研究及玉龙雪山植物多样性组成提供理论基础。

[Objective]The research aimed to study the karyotype composition of wild ornamental plant Asparagus filicinus.[Method]The conventional tableting method was used to observe the chromosome of the wild ornamental plant A.filicinus in Yulong Snow Mountain,and statistically analyzed the relative length,absolute length,chromosome type,karyotypic asymmetry,centromere index CI and other karyotype indicators.[Result]The result showed that A.filicinus was diploid,the karyotype of A.filicinus 2n=2x=20=10m+10sm,and the karyotype asymmetry was 2B,with B chromosome.Cytological data were reported firstly.[Conclusion]This study provides a theoretical basis for the cytogeography of the Asparagus and the plant diversity of the Yulong Snow Mountain.