ibclogo XVI International Botanical Congess


Abstract Number: 4635
Poster No. = 709


PHYLOGENY OF MAGNOLIACEAE BASED ON NDHF SEQUENCES.


Sangtae Kim, Chong-Wook Park and Youngbae Suh1, Dept. of Biology, Seoul National Univ., Seoul 151-742, Korea, and 1Natural Products Research Institute, Seoul National Univ., Seoul 110-460, Korea.


The ndhF sequences from 85 taxa were determined to address phylogenetic questions on the family Magnoliaceae. Nucleotide substitutions are 1.01% in the subfamily Magnolioideae and 2.46% in the family, which are considerably low in comparison to previous reports on various angiosperms. Magnolia macrophylla and M. dealbata, members of the section Rytidospermum, are placed as a basal group. Of remaining taxa, several lineages are clearly recognized even though their relationships are not completely resolved. The subgenus Yulania forms a well-defined clade. The section Gynopodium forms a clade with Pachylarnax and the section Mangliastrum. Michellia, Elmerrillia and sections Maingola and Alcimandra of the genus Magnolia are grouped together and closely related to the subgenus Yulania and the clade of PachylarnaxBsection ManglietiastrumBsection Gynopodium. Sections Bulimia and Aromadendron are linked with sections Gwillimia and Lirianthe. M. tripetala and Asian members of the section Rytidospermum are closely allied with the section Oyama, and the section Magnolia is nested in the clade of the section Theorhodon. Molecular data provide considerably different views from classifications based on morphology, which suggests that current taxonomic schemes of Magnoliaceae should be reexamined.


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