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张镱锂, 贺士元. 国产6种铁线莲的染色体研究[J]. 植物科学学报, 1990, 8(2): 114-121.
引用本文: 张镱锂, 贺士元. 国产6种铁线莲的染色体研究[J]. 植物科学学报, 1990, 8(2): 114-121.
Zhang Yili, He Shiyuan. CHROMOSOME STUDIES ON 6 SPECIES OF CLEMATIS IN CHINA[J]. Plant Science Journal, 1990, 8(2): 114-121.
Citation: Zhang Yili, He Shiyuan. CHROMOSOME STUDIES ON 6 SPECIES OF CLEMATIS IN CHINA[J]. Plant Science Journal, 1990, 8(2): 114-121.

国产6种铁线莲的染色体研究

CHROMOSOME STUDIES ON 6 SPECIES OF CLEMATIS IN CHINA

  • 摘要: 本文报道了我国产铁线莲属Clematis L.6个种的染色体研究结果。其中2种(灌木铁线莲和粗柄铁线莲)的染色体数目及核型为首次报道,1种(女萎)为国内首次报道。6种均为二倍体(2n=2x=16),基数为8(x=8)。本属基数为8的二倍体核型公式概括如下: 2n=2x=16=10m+2st+(4或2或0)st(2或0)SAT+(0或2或4)t(2或4)SAT核型特征是:中型(4—10.5μm);1—5号为m染色体,6号为st染色体,7—8号染色体变异于st和t之间;具1或2对随体(SAT)染色体。该属染色体的演化处于两种水平:数目变化(包括多倍化和非整倍体变化)和结构变异。后者是本属物种形成的主要方面。3种具异形同源染色体,这种杂合性可能是缺失所致。

     

    Abstract: The paper is a cytological part of hiosystematic studies on Clematis L. in China. Chromosomal numbers and karyotypes of 6 spp. are reported. The results are summarized in Table 1. The chromosomal numbers and karyotypes of 2 species are first reported. The basic number of chromosomes in the genus is mainly 8(x=8), but that of C.flammula (2n=18)and C.paniculata(2n=36) is 9 (x=9)(Roy et al., 1971), an unique one in the genus.The chromosomes are middling, varying between 4.5—10.7μm; pairs 1—5 are submetacentric; pairs 6 are subterminal, pairs 7—8 are varying between subterminal to terminal ones. And one or two pairs of sat-chromosmes attached by a thin strand of chromatin material to their short arms.The results show two evolutionary trend in karyotypes of the genus: number variation(including polyploidy and aneuploidy)and structural variation. The latter is mainly in this genus, and evolution in diploids level.In addition, the first pairs of (m) chromosomes in three plants were heteromophic ones, which probably resulted from the deficiency.

     

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