Phylogeny and evolution of anomalous roots in Daviesia (Fabaceae : Mirbelieae)

Crisp, Michael D. and Cook, Lyn G. (2003) Phylogeny and evolution of anomalous roots in Daviesia (Fabaceae : Mirbelieae). International Journal of Plant Sciences, 164 4: 603-612. doi:10.1086/375318

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Author Crisp, Michael D.
Cook, Lyn G.
Title Phylogeny and evolution of anomalous roots in Daviesia (Fabaceae : Mirbelieae)
Formatted title
Phylogeny and evolution of anomalous roots in Daviesia (Fabaceae : Mirbelieae)
Journal name International Journal of Plant Sciences   Check publisher's open access policy
ISSN 1058-5893
1537-5315
Publication date 2003-07
Sub-type Article (original research)
DOI 10.1086/375318
Open Access Status File (Publisher version)
Volume 164
Issue 4
Start page 603
End page 612
Total pages 10
Place of publication Chicago
Publisher University of Chicago Press
Language eng
Abstract The phylogeny of the Australian legume genus Daviesia was estimated using sequences of the internal transcribed spacers of nuclear ribosomal DNA. Partial congruence was found with previous analyses using morphology, including strong support for monophyly of the genus and for a sister group relationship between the clade D. pachyloma and the rest of the genus. A previously unplaced bird-pollinated species, anceps + D. D. epiphyllum, was well supported as sister to the only other bird-pollinated species in the genus, D. speciosa, indicating a single origin of bird pollination in their common ancestor. Other morphological groups within Daviesia were not supported and require reassessment. A strong and previously unreported sister clade of Daviesia consists of the two monotypic genera Erichsenia and Viminaria. These share phyllode-like leaves and indehiscent fruits. The evolutionary history of cord roots, which have anomalous secondary thickening, was explored using parsimony. Cord roots are limited to three separate clades but have a complex history involving a small number of gains (most likely 0-3) and losses (0-5). The anomalous structure of cord roots ( adventitious vascular strands embedded in a parenchymatous matrix) may facilitate nutrient storage, and the roots may be contractile. Both functions may be related to a postfire resprouting adaptation. Alternatively, cord roots may be an adaptation to the low-nutrient lateritic soils of Western Australia. However, tests for association between root type, soil type, and growth habit were equivocal, depending on whether the variables were treated as phylogenetically dependent (insignificant) or independent ( significant).
Keyword Plant Sciences
Trait Evolution
Phylogenetically Independent Contrasts
Parsimony
Maximum Likelihood
Bayesian Inference
Its Sequences
Legumes
Correlated Evolution
Discrete Characters
Maximum-likelihood
Australian Flora
Limits
States
Genes
Genus
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Biological Sciences Publications
Ecology Centre Publications
 
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Created: Mon, 13 Aug 2007, 13:45:38 EST