Photosynthetica 2014, 52(4):574-580 | DOI: 10.1007/s11099-014-0063-4

Toxic effects of erythromycin on photosystem I and II in Microcystis aeruginosa

C. N. Deng1,2, D. Y. Zhang3, X. L. Pan2,*
1 Key Lab of Plateau Lake Ecology & Global Change, College of Tourism and Geographic Science, Yunnan Normal University, Kunming, China
2 State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, China
3 State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, China

Environmental pollution by antibiotics poses a potential ecological risk to aquatic photosynthetic organisms. In the present study, toxic effects of erythromycin on PSI and PSII were investigated in cyanobacteria culture medium of Microcystis aeruginosa. The activity and electron transport of both photosystems were affected by erythromycin in a concentrationdependent manner. The quantum yield of PSII (YII) was reduced at 0.1 mg L-1 of erythromycin, while the quantum yield of PSI (YI) significantly decreased at concentration of 5-25 mg L-1. The decline of YII was accompanied by an increase of nonregulated energy dissipation (YNO). At 10 mg L-1 of erythromycin, YII decreased by 55%, while YNO increased by 18%. The decrease of YI induced by erythromycin was caused by donor-side limitation of PSI (YND). YND was markedly enhanced with elevated erythromycin concentration. At 10 mg L-1 of erythromycin, YI and YNA (PSI acceptor-side limitation) decreased by 8 and 82%, respectively, while YND rose by 314%. The quantum yield of cyclic electron flow increased significantly at 0.1-1 mg L-1 of erythromycin; it decreased but remained higher than that of the control at 5-25 mg L-1 of erythromycin. The contribution of cyclic electron flow to YI, and to linear electron flow rose significantly with the increasing erythromycin concentration. The maximum values of electron transport rates in PSII and PSI decreased by 71 and 24.3%, respectively, at 25 mg L-1 of erythromycin. Compared with the untreated control, the light saturation of PSII and PSI decreased significantly with increasing erythromycin concentration. We showed that concentrations of erythromycin ≥ 5 mg L-1 could exert acute toxicity to cyanobacteria, whereas the chronic toxicity caused by concentrations of ng or μg L-1 needs further research.

Additional key words: chlorophyll fluorescence; nonphotochemical quenching; photoinhibition

Received: January 9, 2013; Accepted: March 4, 2014; Published: December 1, 2014  Show citation

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Deng, C.N., Zhang, D.Y., & Pan, X.L. (2014). Toxic effects of erythromycin on photosystem I and II in Microcystis aeruginosa. Photosynthetica, 52(4), 574-580. doi: 10.1007/s11099-014-0063-4
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