Microsatellites retain phylogenetic signals across genera in eucalypts (Myrtaceae)

Ochieng, Joel W., Steane, Dorothy A., Ladiges, Pauline Y., Baverstock, Peter R., Henry, Robert J. and Shepherd, Mervyn (2007) Microsatellites retain phylogenetic signals across genera in eucalypts (Myrtaceae). Genetics and Molecular Biology, 30 4: 1125-1134. doi:10.1590/S1415-47572007000600016

Author Ochieng, Joel W.
Steane, Dorothy A.
Ladiges, Pauline Y.
Baverstock, Peter R.
Henry, Robert J.
Shepherd, Mervyn
Title Microsatellites retain phylogenetic signals across genera in eucalypts (Myrtaceae)
Journal name Genetics and Molecular Biology   Check publisher's open access policy
ISSN 1415-4757
Publication date 2007
Sub-type Article (original research)
DOI 10.1590/S1415-47572007000600016
Open Access Status DOI
Volume 30
Issue 4
Start page 1125
End page 1134
Total pages 10
Place of publication Ribeirao Preto, SP, Brazil
Publisher Sociedade Brasileira de Genetica
Language eng
Formatted abstract
The utility of microsatellites (SSRs) in reconstructing phylogenies is largely confined to studies below the genus level, due to the potential of homoplasy resulting from allele size range constraints and poor SSR transferability among divergent taxa. The eucalypt genus Corymbia has been shown to be monophyletic using morphological characters, however, analyses of intergenic spacer sequences have resulted in contradictory hypotheses-showing the genus as either equivocal or paraphyletic. To assess SSR utility in higher order phylogeny in the family Myrtaceae, phylogenetic relationships of the bloodwood eucalypts Corymbia and related genera were investigated using eight polymorphic SSRs. Repeat size variation using the average square and Nei's distance were congruent and showed Corymbia to be a monophyletic group, supporting morphological characters and a recent combination of the internal and external transcribed spacers dataset. SSRs are selectively neutral and provide data at multiple genomic regions, thus may explain why SSRs retained informative phylogenetic signals despite deep divergences. We show that where the problems of size-range constraints, high mutation rates and size homoplasy are addressed, SSRs might resolve problematic phylogenies of taxa that have diverged for as long as three million generations or 30 million years. Copyright by the Brazilian Society of Genetics.
Keyword Microsatellite phylogeny
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
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Created: Wed, 09 Feb 2011, 12:12:23 EST