Primary root growth characteristics in exocyst mutants. (A-L) Characteristics of root growth in exocyst mutants are compared to Col-0 and several brassinosteroid and auxin mutants, as well as to BFA-treated Col-0 roots of 7 day old seedlings. Data for B-L represent averages for 14 cortical cell files (seven roots) evaluated from confocal images. Statistical comparisons to Col-0 (t-tests) are in Additional file 1: Figure S3. Error bars = standard error.