Fig. 5.
Enhanced BR signaling promotes growth of an obligate biotrophic pathogen in a BAK1-dependent manner. (A) Images of representative rosette stage Arabidopsis plants with genotypes listed at the top. Bottom: Quantitative RT-PCR analyses of WRYK6 and WRKY29 transcripts from plants expressing BRI1 (red) or BRI1sud1 (blue) in WT or bak1 genetic backgrounds. (B) Average fresh-weight ratio of seedlings grown in water (NT) or 1 μM flg22 (T). Genotypes are listed at the bottom. (C and D) Twelve-day-old seedlings of the genetic backgrounds indicated at the bottom of the chart were inoculated with conidiospores of the virulent Hpa isolate Noco2 at 32,000 spores/mL. Sporangiophores were counted 4 d after inoculation on cotyledons (C) and on first true leaves (D) for each of the indicated genetic backgrounds. Means, sample sizes, and 2 × SE are presented in Table S1. The experiment was repeated twice. sp, sporangiophores per cotyledon (C) or sporangiophores per leaf (D).