【摘要】 目的：对鬼针草染色体核型等进行系统研究，为该种鉴定、演化和良种选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：除观察到正常的２ｎ＝７２外，还发现有２ｎ＝７０的非整倍体。核型公式是Ｋ（２ｎ）＝６Ｘ＝７２＝３６ｍ＋２８ｓｍ＋６ｓｔ＋２ｔ，染色体相对长度组成为２ｎ＝７２＝８Ｌ＋２６Ｍ２＋３４Ｍ１＋４Ｓ，属于“２Ｂ”型。全组染色体总长是８３．４１μｍ，长臂总长５３．６２μｍ，核型不对称系数为６２．４３％，染色体总体积９７．１７μｍ３。结论：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 systematically study the evolution and fine seeds selection through Bidens bipinnata chromosome number, karyotype and volume. METHODS: Sections combined with micrograph were used to analyse chromosome karyotype etc. RESULTS: Except normal diploid 2n=72, aneuploid 2n=70 was found in the same individual plant root tip. Karyotype formula was based on Levan’s publication in 1964, K(2n)=6X=72=36m+28sm+6st+2t. According to the method of Kuo SR, the species chromosome based on the relative length was 2n=72=8L+26M 2+34M 1+4S, which belonged to "2B" type according to the Stebbings karyotype classification. The total length of chromosome groups was 83.41 μm, the total length of long arms 53.62 μm, and from Arano’s method, the AS.K% was 62.43% . The total volume of chromosome was 97.17 μm 3 according to De vescovi et al. CONCLUSION: Biden bipinnata chromosome number, morphological character are clear.更多还原