Loss of DET1 in High Pigment 2 Tomato Prevents High Temperature Repression of Anthocyanin Biosynthesis in Fruit Through HY5 Stabilization.

Loss of DET1 in high pigment 2 tomato prevents high temperature repression of anthocyanin biosynthesis by stabilizing HY5, enabling sustained pigment production under heat stress.

• Why it matters: Global warming reduces anthocyanin levels in fruits, impacting crop quality and health benefits, especially in heat-sensitive purple tomato varieties. Understanding mechanisms to maintain anthocyanin synthesis under high temperatures is crucial for crop resilience.
• What they did: Researchers studied the COP1-DET1-HY5 regulatory switch in tomato, focusing on the hp2 mutant with a nonfunctional det1 allele, and analyzed gene expression and protein interactions related to temperature effects on anthocyanin accumulation.
• The result: The loss of DET1 impedes COP1 activity in degrading HY5, allowing continued anthocyanin synthesis at high temperatures, and introgressing hp2 into purple tomatoes may counteract temperature-induced quality loss.