Abstract Detail

Development and Structure

Whipple, Clinton [1], deTemple, Joseph [2], Mosquera, Veronica [3], Nielson, Bryce [2].

The genetic architecture of floral morphology in Gilia (Polemoniaceae).

Forward genetics is a powerful approach to identify the genetic basis of segregating morphological traits. Any heritable phenotype that segregates in a population can be mapped, and with enough genetic resolution the causative genetic polymorphism can be uncovered. Generating a mapping population requires parental lines that are cross compatible, which typically limits forward genetics to induced or natural variation within the same species. However, artificial hybridization between morphologically distinct species occasionally allows for mapping of interspecific variation. Considering the extensive hybridization of morphologically diverse species within angiosperms in combination with the increased ease of genome assembly and genotyping, a large array of taxa and phenotypes are now open for forward genetics. The morphologically distinct Gilia capitata and Gilia yorkii form a fertile hybrid, and F2 progeny segregate the morphological traits of their parent species. Informed by a whole genome assembly of G. yorkii, we are mapping quantitative trait loci (QTL) for flowering traits in this cross. While flower color appears to be controlled by a single major affect locus, size and shape each floral whorl as well as inflorescence architecture are more polygenic. Extensive correlation among floral QTL in F2 plants suggest either pleiotropy or linkage of QTL regulating these traits. Many traits that segregate in the G. yorkii x G. capitata cross are also polymorphic more broadly across the leafy-stemmed gilias (Gilia section Gilia), making this group a model to investigate convergent evolution and developmental bias.

1 - BYU Biology Department, Biology, 4102 LSB, Provo, UT, 84602, United States
2 - Brigham Young University, BYU Department of Biology, 4102 LSB, Provo, UT, 84602-1052, United States
3 - Brigham Young University, Biology, 4005 LSB , Provo, UT, 84602, United States

flower shape.

Presentation Type: Oral Paper
Number: DS3003
Abstract ID:649
Candidate for Awards:Margaret Menzel Award

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