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| Phylogenetic Affinities of Cercidiphyllaceae Based on mat K Sequences |
| ZANG Qun1, NIE Xiang-ping1, SHI Su-hua2, HUANG Ye-lin2, TAN Feng-xiao2, ZHANG Hong-da2 |
| 1. College of life science and technology, Jinan University, Guangzhou 510632; 2. School of life sciences, Zhongshan University, Guangzhou 510275, China |
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Abstract To further resolve the phylogenetic affinities of Cercidiphyllaceae,matK gene sequences generated for Tetracentraceae,Daphniphyllaceae,Cercidiphyllaceae and Liquidambar,Rhodoleia and Hamamelis of Hamamelidaceae,were analyzed using Neighbor-Joining method with Magnolia as an outgroup.The matK consensus tree displays similar topology to those of rbcL,atpB,and 18S rDNA sequences analyses respectively and combined with greater phylogenetic resolution.It shows that Cercidiphyllaceae,Daphniphylliaceae and Hamamelidaceae formed a robust clade,but relationships among them are not resolved;the phylogenetic relationships of Tetracentraceae to Cercidiphyllaceae are not so closed as traditional treatment.Thus,several lines of evidence,derived from both the chloroplast genome and 18S rDNA sequences,suggest the presence of considerably phylogenetic affinities between Cercidiphyllaceae,Daphniphyllaceae,and Hamamelidaceae,further information on some other quickly-evolved genes are needed to resolve phylogenetic relationships among them.The study corroborates the idea that matK sequences have potential in resolving phytogeny at family level.
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Received: 25 April 2003
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