Through raditional quashing method,we studied the chromosome number and karyotype of 2 poppy (Pa paver somniferurn) isoform with 10 samples,which were collected from five provinces in China.The results showed that two subtypes Isoform No.1 and No.2 were diploid with 2n=2x=22 chromosomes.The composition of relative length chromosomes for Isoform No.1 and No,2 was 2L+3M2 + 5M1 + 1S.The karyotype formula for Isoform No.1 was 18sm+4st,and the asymmetry index was 72.04% ("4A" type).The karyotype formula for Isoform No.2 was 16sm+6st,and the asymmetry index was 73.00% ("4B" type).The karyotype of different sample were highly asymmetrical,but slight differences were present among them.%为揭示不同地区生境条件下的罂粟生态型的染色体核型变化,利用普通压片法对来自中国5个省(市)的10份罂粟材料染色体数与核型进行了分析.结果表明,不同地区来源的罂粟材料可分为白花1号和白花2号2个生态型,染色体倍性均为二倍体,染色体数目为2n=2x=22条,染色体相对长度组成(IRL)为2L+ 3M2+ 5Ml+ 1S；白花1号的核型公式是K(2n)＝2x=22＝18sm+ 4st,平均核型不对称系数(Ask)为72.04％,核型分类标准属于4A型；白花2号的核型公式是K(2n)＝2x=22＝16sm+ 6st,平均核型不对称系数为73.00％,核型分类标准属于4B型；不同地区的白花1号和白花2号的核型均为极不对称型,但核型发生了多样性变化.
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