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Abstract Detail



The Role of Boundaries in Plant Diversification

Whipple, Clinton [1], Thayer, Rachel [2], Guo, Jinyan [3].

Constraining branch meristem determinacy in the grasses: boundaries as novel signaling centers.

Understanding the genetic mechanisms that underlie morphological novelty requires a well-supported theoretical framework. The homeotic ABC model provides a strongly supported framework to investigate both the origin of flowers as well as floral diversification. Compared to this paradigm of plant development, inflorescence development in the angiosperms is poorly understood. While models have been proposed for simple inflorescence architectures in the eudicots, they cannot fully explain complex inflorescences as seen in the grass family. In order to make sense of the intricate and stereotyped branching events of grasses, a working model of homeotically shifting meristem identities has become accepted in the literature. I argue that this shifting meristem model does a poor job of explaining the existing developmental genetic data on grass inflorescences, which are better understood from a novel framework of competing signaling centers localized at morphological boundaries that regulate meristem determinacy. Recent work from my lab on maize branching and bract mutants will be presented that further support the signaling center model. These inflorescence signaling centers appear to be morphological novelties of the grass family and suggest that constraints created by signals from morphological boundaries were crucial to the evolution of the complex inflorescence architectures of the grass family.


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1 - Brigham Young University, Biology, 4102 Life Sciecnes Building, Provo, UT, 84602, USA
2 - Brigham Young University, Biology, 4102 Life Scieces Building, Provo, UT, 84602, USA
3 - Brigham Young University, Biology, 4102 Life Sciences Building, Provo, UT, 84602, USA

Keywords:
maize
inflorescence
Evo-devo
grass.

Presentation Type: Symposium Presentation
Session: SY7, The Role of Boundaries in Plant Diversification - with Presentation of Pelton Award to Dr. Shirley Tucker
Location: Sundance 3/Omni Hotel
Date: Wednesday, June 28th, 2017
Time: 3:45 PM
Number: SY7006
Abstract ID:404
Candidate for Awards:None


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