Physiological responses and specific fatty acids composition of Microcystis aeruginosa exposed to total solar radiation and increased temperature

The combined effects of increased temperature and solar ultraviolet radiation (UVR, 280–400 nm) on M. aeruginosa cultures was analyzed in terms cell abundance, reactive oxygen nitrogen species (ROS/RNS), antioxidant activity catalase (CAT), superoxide dismutase (SOD), glutathione S transferase (GST), fatty acids (FA) content lipid damage. After 12 days exposure to high (29 °C), cells were exposed UVR (4 h). Ultraviolet-B (UVBR, 280–315 resulted into low ROS/RNS a significant increase SOD with no changes GST decreased CAT at control (26 °C). A the enzymatic antioxidants observed 29 °C, as response avoid ultraviolet-A (UVAR, 315–400 relative abundance ω6 FAs not affected by UVAR while ω3 FA highly sensitive °C but unsaturated (UFA) peroxidation did occur. differential results differences damage antioxidants. It evident that selected UFAs (mostly ω6) play an important role adaptation addition shifting growth from 26 °C. Thus, death UFA avoided irradiance thanks activity.