Karyotypes of Zamia Chigua (Cycadales)
Karyotypes of Zamia Chigua (Cycadales)
复制标题
Zamia Chigua（苏铁目）的核型
DOI：
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发表时间：
1981
期刊：
影响因子：
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通讯作者：
K. Norstog
中科院分区：
文献类型：
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作者：
K. Norstog
摘要：Zamia chigua是南美洲哥伦比亚太平洋沿岸的一种乔木苏铁，染色体数目为2n = 22、24、25和26。从两个相邻的种群收集的标本显示这个范围内的数目与核型不同，主要是在端着丝粒和中部着丝粒染色体的数目存在于每一个; 2n = 22，24，25，26植物被发现有4，2，1和0中部着丝粒和12，16，18，和20端着丝粒染色体，分别。根据形态学和生态学特征，认为齐瓜泽米属是齐瓜属的原始成员，染色体和核型的进化是通过端部着丝粒染色体的融合而发生的，产生了数目较低，对称的核型发现在明显更专门的成员的g...
SUMMARYZamia chigua, an arborescent cycad of the Pacific coast of Colombia, South America, has been found to have chromosome numbers of 2n = 22, 24, 25 and 26. Specimens collected from two adjacent populations displayed this range of numbers with karyotypes differing principally in the numbers of telocentric and metacentric chromosomes present in each; 2n = 22, 24, 25, 26 plants were found to have 4, 2, 1 and 0 metacentrics and 12, 16, 18, and 20 telocentric chromosomes, respectively. Because all plants examined in the field demonstrated high fertility, it is inferred that meiosis and fertilization are essentially normal despite differences in chromosome numbers.Zamia chigua, on the basis of morphological and ecological characteristics, is considered to be a primitive member of its genus, and it is thought that chromosome and karyotype evolution in Zamia has occurred by fusion of telocentric chromosomes, producing lower-numbered, symmetrical karyotypes found in apparently more specialized members of the g...