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This article explores the role of brassinosteroids (BRs) in regulating seed thermoinhibition in Arabidopsis thaliana. Seed thermoinhibition is the prevention of seed germination under high temperatures to prevent overheating and potential death. The study found that BRs inhibit the activity of DELLA factors, which promote the accumulation of abscisic acid (ABA) in the endosperm, leading to seed thermoinhibition. The researchers also discovered that BRI1, a plasma membrane receptor, signals in the endosperm to moderate seed thermoinhibition responses. These findings suggest that BRs play a crucial role in regulating seed germination under high temperature conditions. [Extracted from the article]