Abstract Detail



Systematics

Ickert-Bond, Stefanie [1], Harris, AJ [2], Berios, Hazel [1], Lutz, Sue [3], Wen, Jun [4].

A detailed study of leaf micromorphology and anatomy of New World Vitis L. subgenus Vitis within a phylogenetic and ecological framework reveals evolutionary convergence.

We investigated the correlation of leaf anatomy and micromorphology in New World Vitis with molecular phylogenetic relationships and environmental affinity. We observed the leaf anatomy and micromorphology traits using light and scannng electron microscopy and focused on traits known to differ among species of Vitis according to traditional taxonomy: trichome type, stomata morphology, mesophyll organization, and midrib vascularization. We found that traits associated with water conductance and photosynthesis comprised the highest loadings of axis one of a principal components analysis (PCA) while traits related to gas exchange (i.e., the stomatal apparatus) had high loadings on axis two. Using the PCA, we identified seven clusters of species, which showed little correlation to recently reported molecular phylogenetic relationships. PCA axes one and two separated species occurring in dry southwestern North American habitats from those in mesic places. In contrast, Bayes Traits and Bayesian Binary Method revealed little to no evolutionary correlation between pairsof leaf traits and ecological tolerances represented by univariate environmental features of precipitatio and seasonality. Thus the leaf morphology and anatomy of New World Vitis appear to have high correlation with environment based on our observation of these traits and the environments of the species possessing them and based on our PCA. Thus, we expect that the trait similarities among distantly related species may result from evolutionary convergences, especially within xeric habitats of western North America, not phylogenetic relationships. However, the correlation between leaf traits and ecological tolerances are complex and merit further study, especially using robust, multivariate models of the abioti and biotic environment of species.


Related Links:
Ickert-Bond website


1 - University Of Alaska Fairbanks, Herbarium (ALA) And Dept. Of Biology And Wildlife, University Of Alaska Fairbanks, 907 Yukon Dr., Fairbanks, AK, 99775, United States
2 - Oberlin College , Department of Biology, Science Center K123, 119 Woodland Street, Oberlin, OH, 44074, USA
3 - Smithsonian Institution, Department of Botany, MRC-166, , PO Box 37012, Wshington, DC, 20013-7012, USA
4 - Botany, MRC-166 National Museum Of Natural History, 10th St. & Constitution Ave., NW, Mrc 166, Washington/DC, 20013, United States

Keywords:
Bayesian Binary Method
Bayes Traits
Leaf anatomy
micromorphology
principal components analysis
Vitaceae
Vitis.

Presentation Type: Oral Paper
Number:
Abstract ID:545
Candidate for Awards:None


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