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Abstract Detail

Development and Structure

Hodge, John [1], Doust, Andrew [2].

Exploring the genetic basis of ontogeny and morphology through the use of second-order function-value traits.

The mechanistic basis of morphological variation in plants has been a key interest in botany, however, understanding this variation has been difficult because of the modular growth of plants through time. We have designed two low-cost flexible phenomics workflows, called acute and homology, that are able to track homologous pseudo-landmark positions corresponding to plant organs over the growth of a plant. The resulting data was analyzed using function-value trait modeling, which led us to recognize that consecutive function-value trait models for individual subunits show ontogenetic contingency with one another, and that the ontogeny of all of the subunits (such as leaves on an axis, or internodes on a stem, can be modeled with second-order function-value traits (2FVT). The 2FVT model has the advantage of providing a mechanistic model to describe variation in size either through time or between positions, as opposed to allometric approaches that use correlation between measurements to impute changes over time. Utilizing a subset of exemplar recombinant inbred lines (RILs) in a mapping population of Setaria (domesticated S. italica B100 x wild-type S. viridis A10) we were able to describe how similar phenotypic outcomes for well documented traits like plant height can be the result of distinct mechanistic processes that converge on a similar result. We are now addressing the genetic basis of these differences using the full RIL population, in order to describe how 2FVT parameters can be used as a tool to explore the relationship between height as a composite phenotype resulting from the distribution of canopy leaves along the plant axis. We plan to use the 2FVT parameters underlying this variation as quantitative traits to assess the genetic control of these parameters.

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Related Links:
Doust Lab website

1 - Oklahoma State University, Plant Biology, Ecology, and Evolution, Physical Sciences Room 301, Stillwater, OK, 74078, USA
2 - Oklahoma State University, Plant Biology, Ecology And Evolution, Physical Sciences Room 301, Stillwater, OK, 74078, United States

function value trait

Presentation Type: Oral Paper
Session: DS3, Development and Structure III
Location: /
Date: Thursday, July 22nd, 2021
Time: 10:30 AM(EDT)
Number: DS3003
Abstract ID:655
Candidate for Awards:Katherine Esau Award,Developmental and Structural Section Graduate Student Registration Award

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