Abstract
The knowledge of the effects of Sb(V) on the physiological characteristics of cyanobacteria was still limited. In the present study, responses of photosystem I and II (PSI and PSII), cyclic electron flow (CEF), and interphotosystem electron transport of Microcystis aeruginosa to 5–100 mg/l Sb(V) were synchronously measured using the Dual-PAM-100. 5 mg/l Sb (V) significantly inhibited PSII activity, but had no significant effects on PSI activity. At higher concentrations of Sb(V), the quantum yield and electron transport of PSI were less affected compared to PSII. The ratio of Y(II)/Y(I) significantly decreased with increasing Sb(V) concentration. It decreased from 0.7 for control to 0.4 for 100 mg/l Sb(V)-treated cells, indicating that the change of the distribution of quantum yields between two photosystems and more serious inhibition of PSII under stress of Sb(V) compared to PSI. CEF was activated associated with the inhibition of linear electron flow after exposure to Sb(V). The contribution of Y(CEF) to the quantum yield and activity of PSI increased with increasing Sb(V) concentrations. The cyclic electron transport rate made a significant contribution to electron transport rate of PSI, especially at high Sb(V) concentration (100 mg/l) and high illumination (above 555 μmol photons/m2/s). The stimulation of CEF was essential for the higher tolerance of PSI than PSII to Sb(V).
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This work was supported by the National Natural Science Foundation of China (U1120302).
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Wang, S., Pan, X. & Zhang, D. PSI Showed Higher Tolerance to Sb(V) than PSII Due to Stimulation of Cyclic Electron Flow Around PSI. Curr Microbiol 70, 27–34 (2015). https://doi.org/10.1007/s00284-014-0678-5
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DOI: https://doi.org/10.1007/s00284-014-0678-5