Arabidopsis GOLDEN2-LIKE transcription factors interact with ABA-INSENSITIVE 4 to modulate cotyledon greening in light-exposed etiolated seedlings.

ABI4 inhibits GLK1 and GLK2 activities to prevent protochlorophyllide accumulation and seedling death in light-exposed etiolated Arabidopsis seedlings.

• Why it matters: Understanding how cotyledon greening and seedling survival are regulated is crucial for insights into plant development and stress responses, especially under light exposure.
• What they did: The study examined interactions between GLK1, GLK2, and ABI4 in Arabidopsis, revealing that ABI4 physically interacts with GLKs and acts upstream to modulate protochlorophyllide levels and seedling greening.
• The result: ABI4's inhibition of GLK activity reduces protochlorophyllide accumulation, lowers singlet oxygen levels, and enhances seedling survival, highlighting a key regulatory pathway in light-induced seedling development.