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题名: Natural hybridization and introgression in sympatric Ligularia species (Asteraceae, Senecioneae)
作者: Yu, Jiao-Jun1, 2; Kuroda, Chiaki3; null(龚洵)1
刊名: JOURNAL OF SYSTEMATICS AND EVOLUTION
关键词: chloroplast fragments ; ISSR markers ; Ligularia ; natural hybridization ; nuclear ribosomal ITS
英文摘要: The difficulty in clarifying species of genus Ligularia Cass. has been attributed to rapid and continuous allopatric speciation in small and isolated populations, combined with interspecific diploid hybridization in the Qinghai-Tibetan Plateau and adjacent areas. However, no concrete example has been reported to prove this hypothesis. We studied a natural mixed population of six species of Ligularia in which some individuals were morphologically intermediate between L. subspicata and L. nelumbifolia. Based on DNA sequences (trnC-F, trnL-rpL32, trnQ-5' rps16, trnK-rps16, and internal transcribed spacer) and inter-simple sequence repeat data, we concluded that putative hybrids are primarily products of hybridization between L. nelumbifolia and L. subspicata. The other four species or additional, unknown species may also be involved in hybridization. This hybridization is bidirectional but asymmetrical. Hybrid individuals were mostly the first generation, but F-2 and later-generation hybrids were also present. Moreover, the backcrossed individuals detected indicate that natural gene flow occurs among at least three Ligularia species. Hybrids may become stabilized to form new species or may function as intermediates in evolutionary diversification.
出版日期: 2011-09-01
卷号: 49, 期号:5, 页码:438-448
DOI标识: 10.1111/j.1759-6831.2011.00150.x
语种: 英语
ISSN号: 1674-4918
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内容类型: 期刊论文
URI标识: http://ir.kib.ac.cn/handle/151853/5295
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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作者单位: 1.Chinese Acad Sci, Key Lab Econ Plants & Biotechnol, Kunming Inst Bot, Kunming 650201, Peoples R China
2.Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China
3.Rikkyo Univ, Dept Chem, Tokyo 1718501, Japan

Recommended Citation:
Yu, JJ; Kuroda, C; Gong, X.Natural hybridization and introgression in sympatric Ligularia species (Asteraceae, Senecioneae),JOURNAL OF SYSTEMATICS AND EVOLUTION,2011,49(5):438-448
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