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タイトル: Preliminary report on the molecular phylogeny of the Laurencia complex (Rhodomelaceae)
著者: Abe, Tsuyoshi
Kurihara, Akira
Kawaguchi, Shigeo
Terada, Ryuta
Masuda, Michio
キーワード: Chondrophycus
corps en cerise
Laurencia complex
L. flexilis
molecular phylogeny
periaxial cell
発行日: 2006年4月28日
出版者: International Coastal Research Center, Ocean Research Institute, the University of Tokyo
掲載誌情報: Coastal marine science. Vol.30No.1, 2006.4, pp. 209-213
抄録: A molecular phylogenetic analysis of three closely related red algal genera, Laurencia, Chondrophycus and Osmundea (Rhodomelaceae) that are often called the Laurencia complex or Laurencia sensu lato, mainly of the north-western Pacific species, was carried out based on rbcL gene sequences. The sequence data downloaded from GenBank were also included in our analysis. The monophyly of the clade of Osmundea species was supported by high bootstrap value. All examined species of Laurencia sensu stricto with typical features (four periaxial cells per vegetative axial segment, longitudinally oriented secondary pit-connections between contiguous superficial cortical cells, corps en cerise within superficial cortical and trichoblast cells) also constituted a monophyletic clade with high bootstrap value. On the other hand, Chondrophycus species were divided into two separated clades with relatively high bootstrap values respectively. Furthermore, L. flexilis, which has four periaxial cells per vegetative axial segment but lacks secondary pit-connections between contiguous superficial cortical cells, constituted an independent monophyletic clade with high bootstrap value. These results suggest that only two groups, Osmundea and the typical Laurencia, are monophyletic and Chondrophycus is polyphyletic within the Laurencia complex. The phylogenetic position of L. flexilis, an intermediate species between the typical Laurencia and Chondrophycus, must be clarified to determine the key features to distinguish Chondrophycus and Laurencia sensu stricto. Further investigations based on the other genes are expected.
URI: http://hdl.handle.net/2261/5634
ISSN: 13493000
出現カテゴリ:Coastal Marine Science
Coastal Marine Science


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