芒草染色体核型分析

摘要

The number and karyotype of Miscanthus sinensis chromosome was researched with root tip squash method. The formula for karyotype is 2n=2x=48=26m+16Sm+6St and belonged to the type of 2C. The number of Miscanthus sinensis chromosome is 2n=48. The basic number of chromosome is x=24.%应用根尖压片法对芒草的染色体数目和核型进行了研究,核型分析按李懋学标准进行, 核型类型根据Stebbins标准划分, 核型不对称性系数( As.K%)按Arano的方法计算.结果表明:芒草的染色体数目为2n=48,染色体基数为x=24,核型中有13对m染色体、8对Sm染色体及3对St染色体.核型公式为:2n=2x=48=26m+16Sm+6St.染色体的相对长度变化范围为0.45%～2.45%,臂比变化范围为1.10～3.97.最长与最短的染色体的长度比为5.74.核型不对称性系数(As.K%)为63.07%,核型属"2C"型.