Presenter: Joseph DeTemple
Authors: Joseph DeTemple, Clinton Whipple
Faculty Advisor: Clinton Whipple
Institution: Brigham Young University
We provide quantitative trait loci (QTL) and heritability values for several floral and inflorescence traits from an F2 mapping population created from the species Gilia yorkiiand G. capitata. These two species are closely related, yet have separate and distinct floral and inflorescence morphologies, providing an excellent system for studying the genetic and evolutionary basis of these traits. This genus has never been studied in a quantitative genetics context before, and has unique traits suited to exploring functions and interactions of genes affecting floral morphology and inflorescence architecture. Of particular interest is the trait “Solitary Flower Number,” an important distinguishing character between G. yorkiiand G. capitata, for which six significant loci were identified, explaining 89% of the variance measured in the F2 population. In addition, significant loci for Corolla, Anther, Calyx, Midrib, Filament, Internode, and Pedicel lengths are reported. A Principal Component Analysis (PCA) was also conducted to quantify overall differences in floral morphology between the two species. These analyses provide a solid basis for quantifying differences between G. yorkiiand G. capitata,discovering the genetic basis of traits, and exploring correlations between different traits. The results of this study highlight the viability of Giliaas a prospective model system for further trait studies and evolutionary analysis.