Mapping quantitative height traits in sorghum across growth stages
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The Honors project is potentially the most valuable component of an Honors education. Typically Honors students choose to do their projects in their area of study, but some will pick a topic of interest unrelated to their major.
The Honors Program requires that the project be presented at a poster presentation event. Poster presentations are held each semester. Most students present during their senior year, but may do so earlier if their honors project has been completed.
This site presents project descriptions and selected posters for Honors projects completed since the Fall 2015 semester.
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Abstract
Heterosis, the relative increase in fitness of a hybrid offspring as compared to its parents, has contributed significantly to gains made through plant breeding. This phenomenon is most often observed in tall hybrid plants with increased vigor; however, the physiological mechanism behind this result is still poorly understood. This experiment presents the effect of several height-controlling genes in sorghum across its growth stages, examining changes in expression as plant development proceeds. QTL mapping revealed an early-acting height gene in chromosome 4, as well as fluctuations in previously identified regions in chromosomes 7 and 9. Mapping across growth stages allowed the changing effects of these genes to be observed, which is not possible when measurements are taken only after plants have reached maturity.