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Abstract Detail


Molecular Ecology and Evolution

Barrett, Craig F. [1], Freudenstein, John [2].

Patterns of morphological and molecular variation in the Corallorhiza striata species complex (Orchidaceae, Epidendroideae).

Corallorhiza striata Lindley is a wide-ranging, morphologically variable, mycoheterotrophic orchid complex distributed across North America. Relationships among previously delimited varieties of C. striata and recently described C. bentleyi Freudenstein are poorly understood. DNA sequencing of two plastid regions identified four major clades. Clade A consisted of C. bentleyi + C. striata var. involuta, sister to a clade of the remaining members of C. striata. Within the latter, California accessions (Clade B) were sister to accessions of C. striata vars. striata (clade D) and vreelandii (clade C); the latter were sister to each other. Principal Components Analysis and Nonparametric MANOVA based on quantitative morphological characters (using clades as independent variables) identified distinct groupings. Morphological analyses supported differentiation of both C. striata var. involuta, and C. bentleyi relative to all other accessions of C. striata, suggesting their recognition as separate species of the C. striata complex. The biogeographic scenario was more complex than previously thought, with members of both clades A and (B(C(D)) present in both southern Mexico and northern North America. Molecular and morphological patterns within the C. striata complex will be useful for future comparisons of other poorly studied plant groups sharing Mexican-northern North American geographic distributions.


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1 - Ohio State University, Department of Evolution, Ecology, and Organismal Biology, OSU Herbarium (OS), Museum of Biological Diversity, 1315 Kinnear Rd., Columbus, Ohio, 43212, USA
2 - Ohio State University, Department of Evolution, Ecology and Organismal Biology, Museum of Biological Diversity, 1315 Kinnear Rd., Columbus, Ohio, 43212, USA

Keywords:
Orchidaceae
Corallorhiza
rbcL
morphology
plastid sequence data
MANOVA
rpl32-trnL
phylogeography
phylogeny
clade.

Presentation Type: Oral Paper:Papers for Topics
Session: 43
Location: 214/216/SUB
Date: Tuesday, July 29th, 2008
Time: 2:30 PM
Number: 43005
Abstract ID:525


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