Strain-Specific Impact of Titanium Dioxide Nanoparticles on Fremyella Diplosiphon Physiological and Metabolic Responses.

ABSTRACT: Titanium dioxide nanoparticles (n-TiO₂) have emerged as potent modulators of photosynthetic activity in cyanobacteria; however, their strain-specific physiological effects in Fremyella diplosiphon, a model cyanobacterium, remain unexplored. In this study, we investigated the impact of n-TiO₂ on growth, pigment autofluorescence, photosynthetic capacity, reactive oxygen species (ROS) generation and ATP synthase activity in F. diplosiphon strains B481-SD (overexpressed with the sterol desaturase gene) and B481-WT (wild type). Growth as a measure of optical density was maximal in B481-SD at 2.0 mg/L (0.67 ± 0.01) and in B481-WT at both 2.0 (0.55 ± 0.01) and 16 mg/L (0.52 ± 0.01) n-TiO₂ on day 12. Pigment accumulation over 15 days revealed enhanced phycocyanin (1300 ± 2) a

SUBMITTER: Sayadujjhara M 

PROVIDER: S-EPMC12665634 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature