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中国特有的八角莲和六角莲的核型
张定成; 邵建章; 李东林;   
1.安徽师范大学生物系;2.安徽师范大学生物系 芜湖 241000;3.芜湖 241000;4.86届毕业生 淮南师范专科学校
摘要:
本文研究了八角莲Dysosma versipellis(Hance)M.Cheng和六角莲Dysomapleiantha((Hance)Woodson的核型。二者的染色体数目均为2n=12,由四对具中部着丝点染色体、一对具近中部着丝点染色体和一对具端部着丝点染色体组成,各有一对染色体具有次缢痕,八角莲的次缢痕在第3对染色体的长臂上,六角莲的次缢痕在第1对染色体的短臂上。二者均属较对称的“2A”核型。但它们在染色体相对长度的变异幅度和差值、臂比的变异幅度和差值以及最长与最短染色体的比值上均有微小的差异。结果表明二者有密切的亲缘关系。演化趋势是八角莲→六角莲。八角莲的核型为首次报道。
关键词:  八角莲  六角莲  核型  
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