The abstract is read at the publisher; the summary is JClub's.
SlCOP1 proteins restrict fruit plastid development in tomato by inhibiting SlHY5-dependent GLK2 activation, suppressing chloroplast development and chlorophyll accumulation specifically in fruits.
- Why it matters: Light signaling regulates plant development, but it is unclear how it differentially programs plastid development across organs. This work addresses tissue-specific control of fruit versus leaf plastid development.
- What they did: Using CRISPR-Cas9 SlCOP1 mutants, the study shows SlCOP1s destabilize SlHY5 and alter light-responsive transcription in seedlings, while in fruits SlHY5 directly binds the GLK2 promoter to activate expression. It also tests whether GLK2 control involves CUL4-DDB1-DET1-mediated GLK stability.
- The result: In fruits, SlCOP1s suppress chloroplast development and chlorophyll accumulation by blocking SlHY5 activation of GLK2, a mechanism distinct from CUL4-DDB1-DET1 regulation. Slcop1 double mutants show enhanced plastid development linked to increased carotenoid accumulation in fruit.
The findingWhy it mattersWhat they didThe result
AI summary of the abstract · may contain errors · not medical advice · read the paper.