In photosynthetic systems of oxygenic type, plastoquinone (PQ) molecules are reduced by photosystem II (PSII). The turnover of PQ determines the rate of PSII operation. PQ molecules are present in surplus with respect to PSII. In this work, using the pulse amplitude modulation‐fluorometry technique, we quantified photo‐reducible PQ pools in chloroplasts of two contrasting ecotypes of Tradescantia, acclimated either to low light (~ 100 μmol photons·m−2·s−1, LL) or to high light (~ 1000 μmol photons·m−2·s−1, HL). The LL‐grown plants are characterized by higher capacity of rapidly reducible PQ pool ([PQ]0/[PSII] ≈ 8) as compared to HL‐grown plants of both species ([PQ]0/[PSII] ≈ 4). The elevated content of PQ in LL plants favours photosynthetic electron flow at low‐solar irradiance.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.