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• W1967994128 abstract "Addition of Ni2+, Hg2+ and Cu2+ inhibited the growth, oxygen evolution and oxygen uptake (PS I) in the cells of Cylindrospermum (Hg2+ > Ni2+ > Cu2+). A plot of Vo/V of 2 indicated an increased sensitivity of PS I towards Hg2+ and Ni2+, while Cu2+ exerted an almost similar effect on both PS II and PS I. Hg2+, Ni2+ and Cu2+ induced inhibition of variable fluorescence of Chl a, and DCPIP (50 μM) reduction was reversed by protonophore FCCP (10 μM). Thus, it could be argued that heavy-metal-induced modulation of charge separation (H+ ion movement) across the membrane might be accounting for an increase in the high energy state quenching (qE) of fluorescence and inhibition of Hill activity. Further, addition of electron donors, DPC and H2O2 (25 μM, each), could not release the toxic effect of Hg2+, Ni2+ and Cu2+ on Hill activity. Ascorbic acid (ASC) and ferrocyanide (25 μM, each) supported cytochrome C reduction was greatly stimulated by lethal doses of Hg2+ and Cu2+, but remained unaltered with Ni2+ (I-80 dose of each metal). The same concentrations of Hg2+, Ni2+ and Cu2+ were highly inhibitory to ASC + NADP reduction. However, electron transfer from PMS to NADP was sensitive to Ni2+ only. A corollary of these results suggested that action sites of Hg2+ and Cu2+ were located prior to the electron donation site of PMS, but possibly after the cytochrome reductase level, where Hg2+ and Cu2+ might be accounting for the increased level of reduced cytochrome by preventing the simultaneous oxidation of cytochrome. On the other hand, the inhibition site of Ni2+ was located beyond the site of PMS." @default.
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• W1967994128 date "1989-06-01" @default.
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• W1967994128 title "Effect of Ni2+, Hg2+ and Cu2+ on Growth, Oxygen Evolution and Photosynthetic Electron Transport in Cylindrospermum IU 942" @default.
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• W1967994128 doi "https://doi.org/10.1016/s0176-1617(89)80003-3" @default.
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