Findings demonstrate GhSPS1/2 influences plastoquinone-9 levels in Arabidopsis, suggesting roles in photoprotection.
accumulation, and decrease carotenoid and chlorophyll contents, which led to albino phenotype, but silencing GhCAB-151 did not. The functional role of SPS1/2 was further validated in tobacco and Arabidopsis, where they exhibited similar activities to GhSPS1/2. Collectively, these findings demonstrate that the interaction between SPS1/2 and PsbO1 possibly facilitates local biosynthesis of PQ-9 around photosystem II for photoprotection mechanism in plants.
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Wang et al. (2026) studied this question.
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