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Abstract Detail

Anatomy and Morphology

Gallaher, Timothy [1], Klahs, Phillip [2], Attigala, Lakshmi [3], Wysocki, William [4], Burke, Sean [4], Duvall, Mel [5], Clark, Lynn [2].

The effect of light regime, climate and photosynthetic pathway on the distribution of vascular bundles in the grasses.

We investigated the role of the grass leaf as an adaptive macroevolutionary structure. Specifically we evaluated vein density [inter-venal distance (IVD) and inter-bundle distance (IBD)], the number of higher order veins per primary vein and the radius of veins and associated bundle sheaths and their relationships with leaf shape, light regime, climate and photosynthesis pathway over a well resolved time-calibrated phylogeny of the family. There is substantial variability in inter-veinal and inter-bundle distance among C3 taxa with much of the variation associated with light regime and solar radiation levels. Open habitats and higher solar radiation levels are associated with lower IVD and IBD. Among C4 taxa, this variability is reduced and not significantly associated with climate and habitat variables. Models of evolution indicate stabilizing selection towards an optimal state achieved by two main strategies: an increase in the number of higher order veins (particularly in C4 Panicoideae lineages) or an increase in bundle related tissues (primarily in C4 ACMAD lineages). We propose that the relative strength of these two strategies is influenced by the habitat history of the lineage through effects on leaf shape, particularly leaf width.

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1 - University of Washington, Biology, 24 Kincaid Hall, Box 351800, Seattle, WA, 98195, USA
2 - Iowa State University, Department Of Ecology, Evolution, And Organismal Biology, 251 Bessey Hall, Ames, IA, 50011-1020, USA
3 - Iowa State University, 2220 Osborn Dr., Room 251 Bessey Hall, Ames, IA, 50011, United States
4 - Northern Illinois University, 1425 W. Lincoln Hwy, DeKalb, IL, 60115, United States
5 - NORTHERN ILLINOIS UNIVERSITY, Department Of Biological Sciences, 1425 W Lincoln Hwy, DEKALB, IL, 60115-2861, USA

Plant Anatomy
C4 photosynthesis.

Presentation Type: Oral Paper
Session: 20, Anatomy and Morphology
Location: Fort Worth Ballroom 7/Omni Hotel
Date: Tuesday, June 27th, 2017
Time: 9:00 AM
Number: 20005
Abstract ID:352
Candidate for Awards:None

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