| 双花木属和壳菜果属(金缕梅科)的核型研究 |
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| 引用本文： | 潘开玉,杨亲二.双花木属和壳菜果属(金缕梅科)的核型研究[J].中国科学院研究生院学报,1994,31(3):235-239. |
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| 作者姓名： | 潘开玉 杨亲二 |
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| 摘 要： | 本文对金缕梅科Hamamelidaceae双花木属Disanthus Maxim．的长柄双花木D．cercidifolius subsp．longipes和单种属壳菜果属Mytilaria Lec.首次进行了染色体计数和核型分析。结果表明：长柄双花木与产自日本的双花木D. cercidifolius subsp．cercidifolius的体细胞染色体数目一致，均为2n＝16，前者无“st”或“t”染色体，表明该亚种可能比较原始；壳菜果Mytilaria laosensis Lec．的染色体数目为2n＝26，x=13。前人报道的金缕梅科染色体基数为x＝8和x＝12，因此x＝13可能是金缕梅科的一个新染色体基数。联系该属的形态特征及其与马蹄荷属Exbucklandia R．W．Brown的关系，作者支持将壳菜果属处理为独立的亚科，即壳菜果亚科Mytilarioideae。
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| 关 键 词： | 双花木属 壳菜果属 染色体数目 核形态 系统学 |
Karyotypes of Disanthus and Mytilaria (Hamamelidaceae) |
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| Pan Kai-yu,Yang Qin-er.Karyotypes of Disanthus and Mytilaria (Hamamelidaceae)[J].Journal of the Graduate School of the Chinese Academy of Sciences,1994,31(3):235-239. |
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| Authors: | Pan Kai-yu Yang Qin-er |
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| Abstract: | Reported in the present paper are chromosome numbers and karyotypes of two monospecific genera, Disanthus Maxim. and Mytilaria Lec. in the Hamamelidaceae. Disanthus cercidifolius subsp. longipes (H. T. Chang)K. Y. Pan, distributed in China, was found to have the same chromosome number as the subsp. cercidifolius in Japan, i. e. 2n = 16, with x=8. The interphase nuclei were of the simple-complex chromocenter type, and the mitotic prophase chromosomes were of the proximal type. Remarkable differences in karyotype were found between the two subspecies: the former with 2n = 2x = 16 = 6m + 10 sm, while the latter with 2n=2x=16=6m + 6sm + 4st (t). The absence of st ( or t) chromosomes in subsp. longipes, together with gross-morphological evidence, suggest that this subspecies be more primitive than the other. Mytilaria laosensis Lec. was found to have interphase nuclei of the simple-complex type, and mitotic prophase chromosomes of the proximal type. The chromosome number was 2n=26 with x=13 and the karyotype was 2n =2x= 26=22m +4sm (1SAT). This is the first chromosome report for this genus. The basic chromosome number, x= 13, might be a new one for the whole Hamamelidaceae. The present authors support the treatment of Mytilaria as an independent subfamily, Mytilarioideae, considering its morphological characters and relationships with the genus Exbucklandla. |
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| Keywords: | Disanthus Maxim Mytilaria Lec Chromosome number Karyomorphology Systematics |
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