Simultaneous analysis of photosystem responses of Microcystis aeruginoga under chromium stress.

摘要: Abstract Chromium (Cr) is a toxic metal that poses great threat to aquatic ecosystems. Information limited on coinstantaneous responses of photosystems I (PSI) and II (PSII) Cr(VI) stress due lack instruments can simultaneously measure PSI PSII activities. In the present study, quantum yields energy conversion electron transport rates in Microcystis aeruginosa cells were analyzed by DUAL-PAM-100 system. Quantum yield cyclic flow (CEF) under its physiological role alleviating toxicity also analyzed. At 5 mg L −1 Cr(VI), rate decreased significantly, light-induced non-photochemical fluorescence quenching lost. inhibited efficiency use high light more than PSI. showed lower maximal adaptability Electron was higher less PSII, implying sensitivity Cr(VI). Energy dissipation through non-light-induced increased with increasing concentration. CEF stimulated treatment made significant contribution PSI, which essential for protection from stresses light.