Molecular Phylogeny of Eupatorieae (Asteraceae) Estimated from cpDNA RFLP and its Implication for the Polyploid Origin Hypothesis of the Tribe |
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| Authors: | Motomi Ito Tetsukazu Yahara Robert M King Kuniaki Watanabe Sanae Oshita Jun Yokoyama Daniel J Crawford |
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| Institution: | (1) Department of Biology, Faculty of Science, Chiba University, Chiba, 263–8522 Japan, JP;(2) Department of Biology, Faculty of Science, Kyushu University, Fukuoka, 812–8581 Japan, JP;(3) Department of Botany, National Museum of Natural History, Smithsonian Institution, Washington DC. 20560, U.S.A., US;(4) Department of Biology, Faculty of Science, Kobe University, Kobe, 657–8501 Japan, JP;(5) Department of Biology, Graduate School of Science, Tohoku University, Sendai, 980–8578 Japan, JP;(6) Department of Plant Science, Ohio State University, Columbus, OH 43210, U.S.A., US |
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| Abstract: | Neomirandea (x=17 and 25), Ageratina (x=17) and Sclerolepis (x=15) with the higher chromosome base numbers, and the other includes Mikania (x=17) and the remaining genera with lower chromosome base numbers (x=10–11). However, the monophyly of the former clade is supported with a low bootstrap value. In the latter clade, Mikania (x=17) diverged first, then Stevia (x=11), and finally eight genera with x=10 diverged in succession. This result supports the hypothesis that the genera in the tribe Eupatorieae with x =10 evolved from an ancestor with a higher base number, and the tribe is of polyploid origin.
Received 13 September 1999/ Accepted in revised form 20 January 2000 |
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| Keywords: | : Ancient polyploidy Asteraceae Chloroplast DNA Diploidization Dysploidy Eupatorieae |
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