Molecular Systematics of Malesian Litsea Lam. and Putative Related Genera (Lauraceae)

概要

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Phylogenetic relationships within Litsea (Lauraceae) and possibly related genera (Actinodaphne, Lindera and Neolitsea) in the tribe Laureae in the Malesian region were investigated at the molecular level. The nucleotide sequences of chloroplast matK and the nuclear ribosomal DNA ITS regions were analyzed. The results were compared with sequence data in a publication based on materials from China. Among the four sections recognized in Litsea, the molecular data confirmed monophyly only of sect. Litsea. Several species of sect. Conodaphne were nested within sect. Cylicodaphne. Sect. Tomingodaphne and sect. Litsea were found to be more closely related to several species of the Lindera than to Litsea sections Conodaphne and Cylicodaphne. Actinodaphne and Neolitsea, were found to be monophyletic. Combined analysis of the matK sequences of the Malesian and Chinese taxa suggested that a careful reexamination of the taxa in China is necessary. Mapping morphological characters on the molecular trees revealed that dimerous flowers were derived from trimerous flowers and two-celled anthers were derived from four-celled anthers.
日本植物分類学会の論文
2009-03-31