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Effect of oxygen on photosynthetic carbon 14 labeled carbon di oxide fixation in chroomonas sp cryptophyta 2. effects of inhibitors uncouplers and an artificial electron mediator on the inhibition of carbon 14 labeled carbon di oxide fixation by anaerobiosis



Effect of oxygen on photosynthetic carbon 14 labeled carbon di oxide fixation in chroomonas sp cryptophyta 2. effects of inhibitors uncouplers and an artificial electron mediator on the inhibition of carbon 14 labeled carbon di oxide fixation by anaerobiosis



Plant and Cell Physiology 25(3): 377-384



In air-grown Chroomonas sp. cells, low concentrations of DCMU [3-(3,4-dichlorophenyl)-1,1-dimethylurea] (< 0.1 .mu.M) could prevent the inhibition of 14CO2 fixation by anaerobiosis under light-saturating conditions (> 40 W .cntdot. m-2), with phenazine methosulfate showing a similar effect. Antimycin A, carbonyl cyanide m-chlorophenylhydrazone (CCCP) and N,N'-dicyclohexylcarbodiimide strongly inhibited anaerobic photosynthesis at concentrations which did not significantly inhibit the rate under 2% O2 at high light intensity (200 W .cntdot. m-2), although 0.2 .mu.M CCCP stimulated the rate under 2% O2 to some extent. KCN inhibited the rate much more strongly under 2% O2 than N2, although it inhibited the rate very strongly at concentrations above 5 .mu.M both under N2 and 2% O2. The inhibition of photosynthetic 14CO2 fixation by anaerobiosis in this alga apparently result from ATP deficiency caused by over-reduction of electron carriers of the cyclic electron flow and O2 can apparently prevent the overreduction. Cyclic electron flow seems to be necessary to provide additional ATP for CO2 reduction under anaerobic conditions, although it seems to be less necessary under aerobic conditions.

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