Developmental and Structural Section
Salinas, Nelson , Pedraza-Peñalosa, Paola .
Uncovering venation patterns in neotropicalblueberries (Vaccinieae: Ericaceae) and their value for systematics.
Leaf venation in Neotropical Vaccinieae have been inferred from the external morphology of dried leaves and the main patterns have been described as either pinnate or plinerved (one main vein vs. multiple main veins). However, the coriaceous nature of leaves of Vaccinieae makes the discerning of even the primary venation challenging, if not sometimes impossible. Thus, venation patterns have been seldom studied in the tribe and are usually overlooked in taxonomic and phylogenetic studies; conflicting definitions of plinerved venation are in use and have led to ambiguous classification of leaf venation. Leaves from 32 species, corresponding to 16 genera, were cleared; this is the first study to explore venation patterns across neotropical Vaccinieae. Based on the results, three main primary vein frameworks were defined, simple pinnate, acrodromous, and parallelodromous. Furthermore, it was also observed that a mixed venation framework consistently defined some species. Leaf clearings also allowed observing cryptic variation that may be phylogenetically informative; this includes characters such as vein order, FEVs (Free Ending Veinlet) apical shape, FEVs branching, FEVs idioblast, leaf symmetry, and presence of glandular bodies. Phylogenetic value of these, and other venation-related characters, is assessed.
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Blueberries and Relatives (Ericaceae) from the New World Tropics
1 - City University of New York, The Graduate Center, 365 Fifth Avenue, New York, NY, 10016
2 - New York Botanical Garden, Institute Of Systematic Botany, 2900 Southern Blvd., Bronx, NY, 10458, USA
Presentation Type: Oral Paper:Papers for Sections
Location: Union D/Hyatt
Date: Tuesday, July 10th, 2012
Time: 4:30 PM