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- W2055533163 abstract "This work was undertaken to ascertain the impact of different fluence rates of ultraviolet-B (UV-B) radiation on two cyanobacterial biofertilizers, Phormidium foveolarum and Nostoc muscorum, growing under copper toxicity. Copper (2 and 5 µmol L−1) and high UV-B fluence rate (UV-BH; 1.0 µmol m−2 s−1) decreased the growth, pigment content, photosynthetic oxygen yield, phosphate uptake, and acid phosphatase activity in both the strains analyzed after 24 and 72 h of experiments, and combined exposure further enhanced the toxic effects. Respiration and alkaline phosphatase activities were stimulated appreciably. The damaging effect was shown on the order on pigments: phycocyanin > chlorophyll a > carotenoids, and on photosystems: whole chain photosynthetic reaction > photosystem II > photosystem I. Partial recovery in the photosystem II activity in the presence of artificial electron donors; diphenyl carbazide (DPC), hydroxylamine (NH2OH), and manganese chloride (MnCl2) pointed out the interruption of electron flow on the oxidation side of photosystem II. Unlike UV-BH, low UV-B fluence rate (UV-BL; 0.1 µmol m−2 s−1), rather than causing damaging effect partially, alleviated the toxic effects of Cu. This study suggests that the cyanobacterium P. foveolarum is less sensitive against UV-BH and excess Cu (2 and 5 µmol L−1), thus P. foveolarum may be used as a biofertilizer for sustainable agriculture." @default.
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- W2055533163 date "2012-09-01" @default.
- W2055533163 modified "2023-09-26" @default.
- W2055533163 title "Differential effects of UV-B radiation fluence rates on growth, photosynthesis, and phosphate metabolism in two cyanobacteria under copper toxicity" @default.
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- W2055533163 doi "https://doi.org/10.1080/02772248.2012.713956" @default.
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