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Abstract Detail

Evolutionary Developmental Biology (Evo-Devo)

Henriquez, Claudia [1], Teisher, Jordan [2], Schaal, Barbara [3], Croat, Thomas [4].

Leaf Development in Araceae: A New Look at the "Monocot Leaf vs. ‘Dicot’ Leaf" Paradigm.

The plant family Araceae is an ancient monocot lineage from the Early Cretaceous displaying striking variation in leaf developmental morphology that departs from traditional models of monocot leaf development. For example, dissected leaves, which are rare in monocots, seem to have evolved independently multiple times in Araceae by various developmental mechanisms. Historical models of leaf development posit that structural similarities between monocot and "dicot" leaves are the result of convergence, although this hypothesis has been contested. To test the hypothesis of a developmentally independent origin of "dicot"-like leaf characters in monocots, leaf primordium diversity was evaluated in 30 genera of Araceae, along with 36 taxa spanning the angiosperm phylogeny. Leaf primordia were scored for 14 developmental, morphological and anatomical leaf characters. These characters were used to define a leaf primordium morphospace and to evaluate whether "dicot" and monocot taxa occupy similar or different parts of the morphospace. Results of this analysis suggest that at the developmental morphological level, aroid and "dicot" leaves are homologous, occupying similar regions of the morphospace. However, at the molecular genetic level, a review of the literature suggests that statements of homology between monocot and "dicot" leaves must be tested within a framework of hierarchically organized gene regulatory networks regulating leaf development.

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1 - University of California, Los Angeles, Ecology and Evolutionary Biology, 610 Charles E. Young Dr., East, 4140 Terasaki Life Sciences Building, Los Angeles, CA, 90095, USA
2 - The Academy Of Natural Sciences Of Drexel University, Botany, 1900 Benjamin Franklin Parkway, Philadelphia, PA, 19103, United States
3 - Department Of Biology, Campus Box 1137, 1 Brookings Drive, St. Louis, MO, 63130, United States
4 - Missouri Botanical Garden, 4344 Shaw Blvd., St. Louis, MO, 63110, USA


Presentation Type: Oral Paper
Session: 20, Evolutionary Developmental Biology (Evo-Devo) I
Location: 113/Mayo Civic Center
Date: Tuesday, July 24th, 2018
Time: 11:00 AM
Number: 20012
Abstract ID:834
Candidate for Awards:None

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