Figure 5.

Overexpression of the BZR1 gene suppressed bin2/+ and bri1 mutant phenotypes. A, Overexpression of the wild-type BZR1 rescued the short-petiole phenotype of the bin2/+ mutant. B, The cabbage-like rosette phenotype of the bin2/+ mutant was rescued by BZR1 overexpression. C, BZR1 overexpression can rescue the overall growth defect and the silique phenotype of the bin2/+ mutant. Shown in A through C (from left to right) are a wild-type plant, the bin2-1/+ mutant, and transgenic bin2-1/+ plants overexpressing the BZR1 gene. D, The overexpression of the wild-type BZR1 gene in a BIN2⁺ background leads to a phenotype that resembles that of BRI1 overexpression transgenic plants. E, Overexpression of a mutated BZR1 gene containing the Pro-234-Leu mutation rescued the bin2/+ phenotype. Shown here (from left to right) are a wild-type seedling, a bin2-1/+ mutant, and a transgenic bin2-1/+ mutant expressing the mutated BZR1 gene. F, Overexpression of the mBZR1 gene rescued the weak bri1-301 mutation and gives rise to a bes1-like phenotype. From left to right are a bes1-103 bri1-9 double mutant, a transgenic bri1-301 plant expressing the mBZR1 gene, a bri1-301 mutant, and a wild-type control plant.