Abstract Detail

Anatomy and Morphology

Holliday, Aaliyah [1], Martinez-Gomez, Jesus  [2], Rose, Irving [3], Specht, Chelsea [2].

The evolution of the monocot inflorescence using a phylogenetic framework.

The inflorescences of angiosperms consist of a main axis and a series of lateral branches with flowers that can be arranged in diverse architectures. The architecture of an inflorescence plays an important role in optimizing a plant’s reproductive success by facilitating the transfer of pollen, the development of fruit, and plant-pollinator interactions. Despite their importance, the terminology used to describe complex inflorescence architecture is not uniform among authors and the evolutionary transitions among inflorescence types are not well understood. In order to gain a deeper understanding of evolutionary processes that dictate the diversification of these structures, this study aims to consolidate and analyze pre-existing data on inflorescence morphology across monocots using a phylogenetic framework. We systematically searched through the literature to identify and collect morphological data for all major monocot families. Inflorescence morphologies were scored using two coding schemes: The first coding scheme consists of a description or classification of the inflorescence provided in the literature. This scheme provides an unfiltered perspective of inflorescence morphology as described by the author. The second scheme is a code of classifications sensu Endress 2010 that provides a simplified method to classify inflorescences into racemes, cymes, and panicles using branching orders and patterns. We jointly infer ancestral states and state dependent diversification rates using a hidden State Dependent Speciation Extinction (HiSSE) model as implemented in Revbayes. In order to assess if our models are adequate for these data, we simulate 1000 datasets using parameters estimated from our data, then compare our simulations to our observed data. In conclusion, we use our comparative phylogenetic framework to infer the patterns of morphological evolution of inflorescence organization for each major family of monocots.

Related Links:

1 - 130 University Avenue, Ithaca, NY, 14850, United States
2 - Cornell University, School of Integrative Plant Science and L.H. Bailey Hortorium, 502 Mann Library, Ithaca, NY, 14850, USA
3 - 115 Dewitt Place, Dix Hills, NY, 11746, United States

ancestral state reconstruction
phylogenetic comparative methods
state dependent speciation extinction.

Presentation Type: Poster
Session: P, Anatomy and Morphology Posters
Location: Virtual/Virtual
Date: Monday, July 27th, 2020
Time: 5:00 PM Time and date to be determined
Number: PAM005
Abstract ID:769
Candidate for Awards:None

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