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Abstract Detail



Evolutionary Developmental Biology (Evo-Devo)

McKeown, Meghan [1], Preston, Jill [2].

The Evolution of Vernalization Responsiveness in Temperate Pooideae.

Vernalization responsiveness (VR) is an important adaptive trait for timely flowering in seasonal temperate environments, and is hypothesized to be an important innovation allowing diversification of Pooideae (Poaceae) in the cold northern hemisphere. Vernalization genes in the crown group pooids, wheat (Triticum aestivum) and barley (Hordeum vulgare), are well characterized. However, it is not known whether the same genes underlie VR in early diverging vernalization responsive pooids, consistent with a single origin of VR at the base of the subfamily. To test the single origin hypothesis, we determined flowering time and expression of VRN1-3 orthologs in phylogenetically representative non-crown pooid under vernalization and control conditions. VRN gene expression profiles were correlated with VR in at least some pooid tribes. These results tentatively suggest that the evolution of VR was important for the transition of pooids out of the tropics and into the temperate zone.


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1 - University of Vermont, Plant Biology, 63 Carrigan Drive, Jeffords Hall, Burlington, VT, 05401, United States
2 - University of Vermont, 63 Carrigan Drive, Jeffords Hall, Burlington, VT, 05401, United States

Keywords:
Evo-devo
Flowering time
Vernalization
Pooideae
VRN1
VRN2
VRN3.

Presentation Type: Oral Paper:Papers for Topics
Session: 46
Location: Payette/Boise Centre
Date: Wednesday, July 30th, 2014
Time: 5:15 PM
Number: 46007
Abstract ID:196
Candidate for Awards:Katherine Esau Award


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