Chromosome number variation in a promising oilseed woody crop, Plukenetia volubilis L. (Euphorbiaceae)
文献类型： 外文期刊
作者： Cai, Z. Q. 1 ; Zhang, T. 2 ; Jian, H. Y. 2 ;
作者机构： 1.Chinese Acad Sci, Xishuangbanna Trop Bot Garden, Key Lab Trop Plant Resource & Sustainable Use, Mengla 666303, Yunnan, Peoples R China
2.Yunnan Acad Agr Sci, Flower Res Inst, Yunnan Key Lab Flower Breeding, Kunming 650205, Yunnan, Peoples R China
关键词： chromosome number;karyotype;Plukenetia volubilis;polyploidy
期刊名称：CARYOLOGIA （ 影响因子：0.918； 五年影响因子：0.846 ）
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收录情况： SCI
摘要： Cytology of a promising oilseed woody crop, Plukenetia volubilis, was analyzed for the first time here. There are in total 11 different chromosome numbers, ranging from 2n = 50 to 2n = 86 in P. volubilis. Different numbers were found not only in different root tips but also in different cells of the same tip. Among the cells, 2.78% cells had the lowest chromosome number of 2n = 50; and 1.39% cells had the highest chromosome number of 2n = 86. The most common chromosome number is 2n = 58 and about 27.79% cells had this quantity of chromosomes. The chromosomes were extremely small in size, at less than 2 μm. Thus, analysis of chromosome morphology was impaired. Polyploidy, confirmed as the significant evolutionary trend in chromosome number within this species, is briefly discussed. This species is a problematic and polymorphic taxon and our results indicate that its polyploidy can be regarded as the reason.
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