Hamzeh, Mona and Dayanandan, Selvadurai (2004) Phylogeny of Populus (Salicaceae) based on nucleotide sequences of chloroplast TRNT-TRNF region and nuclear rDNA. American Journal of Botany, 91 (9). pp. 1398-1408. ISSN 0002-9122
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Official URL: http://www.amjbot.org/cgi/content/full/91/9/1398
Abstract
The species of the genus Populus, collectively known as poplars, are widely distributed over the northern hemisphere and well known for their ecological, economical, and evolutionary importance. The extensive interspecific hybridization and high morphological diversity in this group pose difficulties in identifying taxonomic units for comparative evolutionary studies and systematics. To understand the evolutionary relationships among poplars and to provide a framework for biosystematic classification, we reconstructed a phylogeny of the genus Populus based on nucleotide sequences of three noncoding regions of the chloroplast DNA (intron of trnL and intergenic regions of trnT-trnL and trnL-trnF) and ITS1 and ITS2 of the nuclear rDNA. The resulting phylogenetic trees showed polyphyletic relationships among species in the sections Tacamahaca and Aigeiros. Based on chloroplast DNA sequence data, P. nigra had a close affinity to species of section Populus, whereas nuclear DNA sequence data suggested a close relationship between P. nigra and species of the section Aigeiros, suggesting a possible hybrid origin for P. nigra. Similarly, the chloroplast DNA sequences of P. tristis and P. szechuanica were similar to that of the species of section Aigeiros, while the nuclear sequences revealed a close affinity to species of the section Tacamahaca, suggesting a hybrid origin for these two Asiatic balsam poplars. The incongruence between phylogenetic trees based on nuclear- and chloroplast-DNA sequence data suggests a reticulate evolution in the genus Populus.
Divisions: | Concordia University > Faculty of Arts and Science > Biology |
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Item Type: | Article |
Refereed: | Yes |
Authors: | Hamzeh, Mona and Dayanandan, Selvadurai |
Journal or Publication: | American Journal of Botany |
Date: | September 2004 |
Funders: |
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Keywords: | cpDNA; phylogeny; Populus; rDNA; reticulate evolution; Salicaceae |
ID Code: | 6703 |
Deposited By: | Danielle Dennie |
Deposited On: | 08 Jun 2010 21:24 |
Last Modified: | 18 Jan 2018 17:29 |
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