Systematics/Phytogeography / Taxonomie/ Section
Ingram, Amanda .
Evolution of leaf blade anatomy in Eragrostis (Poaceae).
Eragrostis Wolf is a genus of approximately 350 grass species in subfamily Chloridoideae distributed throughout the world’s tropics and subtropics. Biochemical analyses of a broad sample of species from this diverse group have suggested that all species use the NAD-ME biochemical pathway of C4 photosynthesis. However, a diverse array of anatomical syndromes can be observed in these taxa, ranging from classic NAD-ME anatomy to a PCK-like configuration of chloroplasts and bundle sheath cells. This study examines the leaf blade anatomy of approximately 40 Eragrostis species in the context of DNA sequence-based phylogenies in an attempt to understand the evolution of anatomical characteristics in the genus. These analyses suggest that typical NAD-ME anatomy (smooth bundle sheath outline with centripetally positioned and elongate chloroplasts) is ancestral in the genus, with several previously undescribed combinations of sheath outline, chloroplast position, and chloroplast shape derived within the group.
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1 - Wabash College, Department of Biology, PO Box 352, Crawfordsville, IN, 47933, USA
Presentation Type: Oral Paper:Papers for Sections
Date: Tuesday, July 29th, 2008
Time: 10:45 AM