两种国产苏铁属植物的核型分析

Karyotypes of Two Species of Cycas from China

报道了苏铁属(CycasL.)2种植物的染色体数目及其核型。它们的体细胞染色体数目均为2n=2x=22,核型均属3B型。核型公式分别是:海南苏铁C.hainanensisK(2n)=2x=22=4m+2sm+4st+12T,仙湖苏铁C.szechuanensissubsp.fairylakeaK(2n)=2x=22=2m+4sm+4st+12T。两种苏铁的核型均为首次报道。支持基于染色体资料把苏铁属分为两个类群的观点。

Chromosome numbers and of the two Cyccls species from China are all 2n=2x=22, and the karyotypes are classified to be 3B according to stebbin＇s category. The karyotype formulas are 2n=2x=22=4m＋2sm＋4st＋12T for C. hainanensis, and 2n=2x=22=2m＋4sm＋4st＋12T for C. szechuanensis subsp.fairylakea. The two karyotypes are reported for the first time. The results support that Cycas can be divided into two groups based on the chromosome data.