Distribution of Sexual and Agamospermous Populations of Eupatorium (Compositae) in Asia
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概要
- 論文の詳細を見る
Examinations of chromosome number voucher specimens show that sexual diploid and agamospermous polyploid plants of Eupatorium in Asia can be distinguished by morphology, fertility, and stainability of pollen grains. Using these criteria, reproductive systems (sexual vs. agamospermous) were estimated for 558 herbarium specimens of Eupatorium in East Asia. Of 22 taxa examined, six included both sexual and agamospermous specimens ; those of one taxon were all agamospermous ; and those of 15 taxa were all sexual. This result shows that 21 taxa are not agamospermous microspecies but are differentiated at the diploid level. Sexual populations of most taxa had restricted geographical distributions. Eupatorium chinense var. chinense and var. oppositifolium consisted of both sexual and agamospermous populations. Sexual populations of these two varieties were allopatric and distinct in external morphology, suggesting differentiation at the species level. The specimens of E. heterophyllum s. str. were all agamospermous, while those of E. mairei, often treated as synonymous with E. heterophyllum, were sexual. In comparing East Asian and North American Eupatorium for the distributional patterns of sexual and agamospermous populations, three differences can be pointed out : (1) Agamospermous plants of autopolyploid origin have evolved in eight species and are widespread in North America ; while most agamospermous plants in East Asia may be of allopolyploid origin, have relatively restricted ranges, and are less frequent than the diploid plants with the exception of in E. chinense var. oppositifolium. (2) The number of sexual species with wide range is greater in North America than in East Asia. (3) The number of sexual species with restricted ranges is greater in East Asia than in North America. The results obtained suggest that speciation among the plants of Eupatorium has occurred more recently in East Asia than in North America.
- 種生物学会の論文
- 1989-06-30
著者
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WATANABE Kuniaki
Department of Biology, Faculty of Science, Kobe University
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Kawahara Takayuki
Hokkaido Research Center, Forestry and Forest Products Research Institute
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Kawahara Takayuki
Hokkaido Research Center Forestry And Forest Products Research Institute
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KAWAHARA TAKAYUKI
Botanical Gardens, Faculty of Science, University of Tokyo
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YAHARA TETSUKAZU
Botanical Gardens, Faculty of Science, University of Tokyo
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WATANABE KUNIAKI
Biological Institute, Faculty of General Education, Kobe University
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渡邊 邦秋
Department Of Biology Graduate School Of Science Kobe University
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Watanebe Kuniaki
Department Of Biology Faculty Of Science Kobe University
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Yahara Tetsukazu
Department Of Biology Faculty Of Science Kyushu University
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Yahara Tetsukazu
Botanical Gardens Faculty Of Science University Of Tokyo
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Watanabe Kuniaki
Department Of Biology Faculty Of Science Kobe University
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Watanabe Kuniaki
Biological Institute Faculty Of General Education Kobe University
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Watanebe Kuniaki
Department Of Biology Faculity Of Science Kobe University
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