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Phylogenetic relationships of Betula species (Betulaceae) based on nuclear A D H and chloroplast mat K sequences
Author(s) -
Järvinen Pia,
Palmé Anna,
Orlando Morales Luis,
Lännenpää Mika,
Keinänen Markku,
Sopanen Tuomas,
Lascoux Martin
Publication year - 2004
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.3732/ajb.91.11.1834
Subject(s) - biology , betulaceae , subgenus , phylogenetic tree , botany , phylogenetics , chloroplast dna , genus , evolutionary biology , gene , genetics
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.