Figure 4.

Identification of semidominant bes1 mutations as suppressors for two different bri1 mutations. A and B, Suppression of bri1-9 mutant phenotypes by a semidominant suppressor mutation m9-1. Shown in A and B (from left to right) are a wild-type plant, a bri1-9 mutant, and a bri1-9 m9-1 double mutant. C, Molecular nature of the five semidominant bri1 suppressor mutations that suppress bri1-5 or bri1-9 mutation. A C-T mutation (indicated by an arrow) in the BES1 gene was detected in the five independently isolated bri1 suppressor mutants, resulting in a missense mutation of Pro-233 to Leu.