Developmental and Structural Section
Doughan, Benjamin , Gerrath, Jean .
Comparative leaf development of two species of Ampelopsis (Vitaceae).
A recent molecular phylogenetic hypothesis for the Vitaceae (Soejima and Wen 2006) placed the two North American species of Ampelopsis (A. cordata Michx. and A. arborea (L.) Koehne) in two different clades. This is correlated with mature leaf morphology in that A. cordata has simple leaves, and A. arborea has compound leaves. The objective of this project was to compare leaf development in the two species from initiation to maturity in order to determine how and when their developmental trajectories differentiate, using epi-illumination micrography and morphometric analysis.
Early leaf initiation and development did not differ, and what appeared to be first order lateral leaflet primordia (LLP1) were initiated acropetally along the margins of the leaf primordia. In A. arborea, once all four pairs of LLP1 were initiated, acropetal initiation of second order lateral leaf primordia (LLP2) from margins of the basal LLP1 occurred, whereas in A. cordata, once five pairs of LLP1 were initiated, lateral growth extending from the margin of the leaf midvein carried the LLP1 outwards to form the dentate margins of the simple leaf blade. In A. arborea marginal growth occurred similarly, but from the lateral primordia, thus forming leaflet blades. A. arborea shows overall symmetrical compound leaf development in a proximodistal direction with all lateral leaflets branching mediolaterally and slightly in the opposite direction of the overall development. A. cordata shows a right handed dominant development that runs in a counter-clockwise trajectory. Overall, these differences in developmental trajectory support the phylogenetic hypothesis.
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1 - University of Northern Iowa, Department of Biology, Cedar Falls, IA, 50614-0421, USA
Presentation Type: Poster:Posters for Sections
Location: Ball Room & Party Room/SUB
Date: Monday, July 28th, 2008
Time: 12:30 PM