早熟禾族3种基因型草坪草的染色体核型分析

Karyotype analysis of three different genotypes of Poeae

通过对禾本科早熟禾族(Poeae)匍匐翦股颖(帕特putter)和多年生黑麦草(首相premier、焦点focus)3种草坪草染色体核型进行分析,结果显示,3种基因型材料的染色体均以中部着丝点和近中部着丝点染色体为主,都具有随体。匍匐翦股颖帕特体细胞染色体数目为30条,核型公式是2n=30=22m(2SAT)+2sm,核型不对称系数(AS.K%)55.2%,分类标准属于"2C"型;多年生黑麦草2个品种草坪草体细胞染色体数目均为14条,其中首相核型公式是2n=14=12m(2SAT)+2st,核型不对称系数58.0%,核型分类标准属于"2C"型;焦点核型公式是2n=14=6m(2SAT)+8sm,核型不对称系数63.05%,属于"2B"型。

Karyotype analysis of three genotypes from two species of Poeae （Agrostis stolonifera and Lolium perenne） is reported. All the chromosomes were median and submedian centromeric, with satellites （SAT）. The number of chromosomes in A. stolonifera （Putter） was 30 （2n）, and in L. perenne （Premier, Focus） was 14 （2n）. The karyotype formula was 2n=30：22m （2SAT）＋2sm for Putter and the asymmetry index was 55.2% （＂2C＂ type）, for Premier, was 2n = 14 = 12m （2SAT） ＋ 2st and the asymmetry index 58.0%（＂2C＂ type）, and for Focus, was 2n=6m （2SAT）＋Ssm, the asymmetry index 63.05%, （＂2B＂ type）.