Hypocotyl auxin response requires TIR1/AFB auxin receptors.

<p>(A–C) Hypocotyl length of wild-type or <i>tir1/afb</i> single or multiple mutant seedlings grown in short days and treated with IAA at the indicated concentrations was measured following 48 hours of auxin treatment. Asterisks represent mutants showing a significantly different response to hormone treatment compared to wildtype. A general linear model (glm performed in R using the car package <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0036210#pone.0036210-Fox1" target="_blank">[104]</a>) was used to determine significance and main effects for genotype were confirmed using ANOVA type III sums of squares. All assumptions for GLM were fulfilled. Error bars indicate standard error.