Divergent Regulatory Effects of Jasmonic Acid on Tomato Lycopene Biosynthesis Under Light and Dark Conditions - PubMed
6 hours ago
- #carotenoids
- #jasmonate
- #light signal
- Jasmonates influence carotenoid biosynthesis in tomatoes, affecting fruit coloration.
- Methyl jasmonate (MeJA) has divergent effects on lycopene accumulation in tomatoes under light and dark conditions.
- In light, MeJA enhances lycopene synthesis by activating the SlPSY1 gene via the SlMYC2 transcription factor.
- SlMYC2 inhibits SlPIF1a, a negative regulator of light signal that degrades in light and accumulates in darkness.
- In dark conditions, accumulated SlPIF1a interacts with SlMYC2, inhibiting its activation of SlPSY1 expression.
- MeJA-induced acetyltransferase SlNATA1 interacts with and acetylates SlPIF1a, enhancing its repression on SlPSY1.
- The study uncovers a dual regulatory mechanism of lycopene synthesis by jasmonic acid under different light conditions.