BRI1-EMS-suppressor 1 gain-of-function mutant shows higher susceptibility to necrotrophic fungal infection.

Brassinosteroids (BRs) are plant-specific steroids that are involved in plant growth and defense responses. However, the exact roles of BR in plant defense are unclear. We used the bes1-D gain-of-function mutant to define the underlying relationship between plant growth and defense through BR signaling and innate immunity.