芍药品种“大富贵”核型分析和减数分裂的细胞遗传学观察

Karyotype Analysis and Cytogenetic Observation on Meiosis in Fragant peony(Paeonia Lactiflora "Da Fu Gui")

对山东青岛地区的芍药品种"大富贵"的核型和花粉母细胞减数分裂行为进行了研究,结果表明该品种为二倍体,染色体数为2n=10,核型公式为2n=2x=10=6m+2sm+2st(SAT),属于2A型。二倍体中有6条中着丝粒染色体,2条近中着丝粒染色体和2条近端着丝粒染色体,其中近中着丝粒染色体和近端着丝粒染色体具有随体。减数分裂过程中观察到明显的染色体行为异常,其中后期Ⅰ和后期Ⅱ有染色体桥。青岛地区观察芍药花粉母细胞减数分裂的最佳时间是4月初到4月底。

The karyotype and meiosis course of Peony＇s Pollen Metrocyte form Qingdao Agricultural Uni- versity in ShanDong Province have been observed. The results showed that the chromosome is diploid, and the number of Paeonia is 10. Kitagawa is 2n = 2x= 10 = 6m ＋2 sm ＋2 st, which belongs to 2A type. Ten chromosomes include six metacentric chromosomes, two submetacentric chromosomes and two acro- centric chromosomes, and the latter two kinds of chromosomes have satellites. Chromosome abnormality was observed during meiosis including chromosome bridge in later period Ⅰ and Ⅱ. The appropriate obser- vation time of the Peony＇s pollen metrocyte cell meiosis is from early April to the end of April in Oingdao.