A BRC1-modulated switch in auxin efflux accounts for the competition between Arabidopsis axillary buds
Fig 8
Model predictions for SIPpin1 bud growth outcomes largely match experimental data.
(A) Stochastic color map of the bud growth outcomes for the (v0, µ) slice used previously (Fig 4), with parameter values for genotypes and treatments in black (as in Fig 5A); and (v0, µ) slice at a 20% lower value of the parameter S, to account for the lower bulk auxin transport in SIP1pin1 lines, with the predicted location in parameter space of each SIP1 line shown with a green dot. (B) Mitchison plots of predicted (top) and (C) empirical (bottom) bud growth phenotypes. Predictions show 50 stochastic simulations per genotype/treatment run for 80 time steps, and those of smxl678 run for 120 time steps. For the experimental data, SIP1pin1smxl678 buds were measured for 19 days and the other genotypes were measured for 12 days. (D) Predicted and (E) empirical relative growth index (RGI) for the genotypes/treatments indicated. Data and simulations of Col-0, Col-0 + GR24, and smxl678 are the same as those from Fig 4A and 4C. The RGI is obtained by calculating the length of the longest bud divided by the combined length of both buds, and is shown only for active explants (those with at least one active bud), n = 50 for predictions and 12–80 for experimental data. Letters indicate statistically significant differences at p < 0.05 obtained from multi-level model with Bonferroni corrections. Data and scripts of simulations underlying this figure can be found at https://doi.org/10.17863/CAM.120831.
doi: https://doi.org/10.1371/journal.pbio.3003395.g008