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题名: Ploidy variation in Buddleja L. (Buddlejaceae) in the Sino-Himalayan region and its biogeographical implications
作者: Chen, G ; null(孙卫邦) ; Sun Hang(孙航)
刊名: BOTANICAL JOURNAL OF THE LINNEAN SOCIETY
关键词: basic chromosome number ; biogeography ; evolution ; interphase nuclei
英文摘要: The chromosome numbers of 27 populations of Buddleja, comprising 14 species, were counted. The basic chromosome number of all species was x = 19, confirming previous reports. Different ploidy levels (2n = 38, 76, 114, 228) were observed in these taxa, representing diploids, tetraploids, hexaploids, and dodecaploids, respectively. The chromosome numbers of B. yunnanensis, B. brachystachya, and B. macrostachya are reported for the first time. The tetraploid 2n = 76 is a new ploidy level for B. myriantha. Particular attention was given to B. macrostachya, because of the variation in morphology and ploidy level between isolated populations of this species. Two types of interphase nuclei were recognized: the complex chromocentre type in B. macrostachya and the simple chromocentre type in the other species. Biogeographically, most of the polyploidy in the Asiatic species occurs in the Sino-Himalayan region. It seems to be associated with the uplift of the Himalayan Mountains, the orogeny of this region playing an important role in the evolution of polyploidy in these taxa. (c) 2007 The Linnean Society of London. Botanical Journal of the Linnean Society, 2007, 154, 305-312.
出版日期: 2007
卷号: 154, 期号:3, 页码:305-312
语种: 英语
收录类别: sci
学科分类: Plant Sciences
ISSN号: 0024-4074
内容类型: 期刊论文
URI标识: http://ir.kib.ac.cn/handle/151853/2491
Appears in Collections:资源植物与生物技术所级重点实验室_期刊论文

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Recommended Citation:
Chen, G; Sun, WB; Sun, H.Ploidy variation in Buddleja L. (Buddlejaceae) in the Sino-Himalayan region and its biogeographical implications,BOTANICAL JOURNAL OF THE LINNEAN SOCIETY,2007,154(3):305-312
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