Hydrogen peroxide concentration as an indicator of cyanobacterial response to diurnal variation in light intensity.

ABSTRACT: We measured diurnal variations in oxidative stress conditions of cyanobacteria utilizing field observations and laboratory experiments in order to evaluate photoinhibition effects. On clear summer days, transparent bottles filled with surface water were set up at several depths and were collected every three hours together with the measurement of the photosynthetically active radiation (PAR). In the laboratory experiment, two cyanobacterial species were exposed to gradually increasing and then decreasing light intensities. The samples were analyzed with the PAR-induced (H₂O₂), along with the total hydrogen peroxide concentrations (total H₂O₂), the catalase activities (CAT), OD₇₃₀, protein (Protein), and chlorophyll a (Chl a) contents,

SUBMITTER: Asaeda T 

PROVIDER: S-EPMC11585545 | biostudies-literature | 2024 Nov

REPOSITORIES: biostudies-literature