Systematics Section / ASPT
Chase, Mark W. .
Phylogenetics of monocotyledons: evidence from mitochondrial matR.
Mitochondrial genes have received attention in recent years as alternative markers for phylogenetics, and we provide here the first extensive matrix for monocots of the mitochondrial gene matR. Unlike other mitochondrial genes that have been produced for monocots, matR has extensive, short insertions and deletions; in this respect matR is highly similar to matK when compared to other plastid genes. In addition, matR does not exhibit the highly unbalanced differences in rates of change. Variation is in general much more even across lineages, and as a result the matR phylogenetic trees are much more similar to those obtained with plastid and nuclear genes than have been previous trees produced by other mitochondrial gene. We detected no instances of horizontal transfer in the nearly 100 monocot accessions for which we produced sequences. These results indicate that the problems and discrepancies of results relative to plastid and nuclear genes observed in analyses of atp1 and other mitochondrial genes are not caused by different signals being present in the mitochondrial genome as a whole. They point to the fact that there are inherent problems with the way in which some specific mitochondrial genes evolve that make them problematic for phylogenetics analyses.
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1 - Royal Botanic Gardens, Kew, Jodrell Laboratory, Richmond, Surrey, TW9 3AB, United Kingdom
phylogenetics of monocotyledons
Presentation Type: Oral Paper:Papers for Sections
Location: Stevens 3/Hilton
Date: Monday, July 9th, 2007
Time: 1:00 PM