SlBES1-mediated brassinosteroid signaling suppresses flavonoid biosynthesis in tomato fruit.

ABSTRACT: With rising living standards, consumers' demand for color diversity and nutritional quality in tomato products has increased. Flavonoids are a key determinant of peel color and nutritional value in tomato fruit, where their biosynthesis is controlled by various phytohormones, including brassinosteroids (BRs). However, the underlying mechanism by which BR regulates flavonoid biosynthesis remains unclear. Here, we show that exogenous BRs suppress flavonoid accumulation, whereas reduced endogenous BR levels in RNAi lines of SlCYP90B3, a rate-limiting BR biosynthetic gene, result in increased flavonoid content in the fruit peel. We further demonstrate that BRI1-EMS-suppressor1 (SlBES1), a basic helix-loop-helix transcription factor essential for BR signaling, not only regulates fruit firmness

SUBMITTER: Jian Y 

PROVIDER: S-EPMC12785153 | biostudies-literature | 2025 Nov

REPOSITORIES: biostudies-literature