| Ploidy, geographical distribution and morphological differentiation of Parasenecio auriculata (Senecioneae; Asteraceae) in Japan. | |
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MedLine Citation:
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PMID: 16328084 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Parasenecio auriculata is a woodland perennial herb widely distributed in Northeastern Asia, constituted by a poorly understood polyploidy with a diploid (2n = 2x = 60) and a tetraploid (2n = 4x = 120). In this study, for a better understanding of the polyploidal evolution, cytogeography and morphological variation were analyzed in Japanese P. auriculata, including two varieties; var. bulbifera endemic to central Hokkaido and var. kamtschatica widely distributed in northern Honshu and Hokkaido. The occurrence of two polyploidal levels was reconfirmed. While var. bulbifera is predominantly tetraploid, var. kamtschatica is comprised of diploid and tetraploid. Morphological variation among 22 quantitative characteristics is continuous and not distinctive among cytotypes or varieties, but plant size tended to be larger in the order, diploid of var. kamtschatica, var. bulbifera, and tetraploid of var. kamtschatica. The cytotype distribution showed a conspicuous geographical pattern. Besides var. bulbifera endemic to the central Hokkaido, the diploid of var. kamtschatica is mainly found in Southern Hokkaido, and the tetraploid has a disjunct distribution in eastern and northern Hokkaido and northern Honshu. Such a geographical pattern is possibly attributable to the differentiation of climatic preference among cytotypes and varieties, and may have been established in association with the climatic cline along the Japanese archipelago. |
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Authors:
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Masato Nakagawa |
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Publication Detail:
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Type: Journal Article Date: 2005-11-18 |
Journal Detail:
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Title: Journal of plant research Volume: 119 ISSN: 0918-9440 ISO Abbreviation: J. Plant Res. Publication Date: 2006 Jan |
Date Detail:
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Created Date: 2006-02-20 Completed Date: 2006-04-27 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9887853 Medline TA: J Plant Res Country: Japan |
Other Details:
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Languages: eng Pagination: 51-61 Citation Subset: IM |
Affiliation:
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Department of Botany, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan. nakagawa@sys.bot.kyoto-u.ac.jp |
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| MeSH Terms | |
Descriptor/Qualifier:
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Analysis of Variance Asteraceae / anatomy & histology*, genetics* Chromosomes, Plant Climate Evolution, Molecular Geography Japan Phenotype Polyploidy* Principal Component Analysis |
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