两种国产苏铁属植物的核型分析

Karyotypes of Two Species of Cycas from China

摘要:

报道了苏铁属（Cycas L.）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.hainanensis K（2n）=2x=22=4m＋2sm＋4st＋12T,仙湖苏铁C.szechuanensis subsp.fairylakea K（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。

Abstract:

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.