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(American Journal of Botany. 2004;91:1834-1845.)
© 2004 Botanical Society of America, Inc.


Systematics

Phylogenetic relationships of Betula species (Betulaceae) based on nuclear ADH and chloroplast matK sequences1

Pia Järvinen2,4, Anna Palmé3, Luis Orlando Morales2, Mika Lännenpää2, Markku Keinänen2, Tuomas Sopanen2 and Martin Lascoux3

2Department of Biology, University of Joensuu, P.O. Box 111, FIN-80101 Joensuu, Finland; 3Department of Conservation Biology and Genetics, Evolutionary Biology Centre, Uppsala University, Norbyvägen 18 D, 752 36 Uppsala, Sweden

The phylogenetic relationships within the genus Betula (Betulaceae) were investigated using a part of the nuclear ADH gene and DNA sequences of the chloroplast matK gene with parts of its flanking regions. Two well-supported phylogenetic groups could be identified in the chloroplast DNA sequence: one containing the three American species B. lenta, B. alleghaniensis, and B. papyrifera and the other including all the other species studied. The ADH gene displayed more variation, and three main groups could be identified. In disagreement with the classical division of the genus Betula, B. schmidtii and B. nana grouped with the species in subgenus Betula, and B. ermanii grouped with species in subgenus Chamaebetula, including B. humilis and B. fruticosa. The ADH phylogeny suggests that several independent polyploidizations within the genus Betula could have taken place. The ADH and chloroplast phylogenies were in part incongruent due to the placement of B. papyrifera. The most likely reason for this seems to be cytoplasmic introgression.

Key Words: ADHBetula • Betulaceae • birch • matK • phylogeny


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K. Gurcan and S. A. Mehlenbacher
Transferability of Microsatellite Markers in the Betulaceae
J. Amer. Soc. Hort. Sci., March 1, 2010; 135(2): 159 - 173.
[Abstract] [Full Text] [PDF]




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