【摘要】 目的　对小花鬼针草染色体核型等进行研究 ,为研究该种鉴定、起源、演化、良种培育等提供必要的细胞学资料。方法　采用常规制片方法 ,结合显微摄影对染色体进行检测分析。结果　小花鬼针草体细胞染色体数目 2n =48;核型公式是K(2n) =4X =48=2 4m +1 8sm +6st,染色体相对长度组成为 2n =48=6L +1 6M2 +2 2M1 +4S ,属于“2B”型。全组染色体总长是 35 .0 3μm ,长臂总长 2 2 .53μm ,核型不对称系数为 64 .32 %。染色体总体积 1 1 .63μm3。结论　小花鬼针草染色体的数量、形态清晰 ,可为进一步的深入研究打下基础更多还原

【Abstract】 OBJECTIVE To study the evolution,identification and fine seeds selection through Bidens parviflora chromosome number,karyotype and volume.METHODS Sections and micrograph were used.RESULTS The normal diploid 2n=48,karyotype formula was based on Levan’s publication in 1964,K(2n)=4X=48=24 m+18 sm+6 st.According to the method of Kou SR,the species chromosome based on the relative length was 2n=48=6 L+16 M 2+22 M 1+4S,which belonged to "2B" type.The total length of chromosome groups was 35.03 μm,the total length of long arms 22.53 μm,and the AS.K% was 64.32%.The total volume of chromosome was 11.63 μm 3.CONCLUSION Bidens parviflora chromosome number,morphological character was found clear.更多还原