Summary: As observed for other cyanobacteria, net H formation or consumption in photoheterotrophic, N-fixing cultures of sp. strain Cc, a cyanobacterium isolated from , was markedly dependent on the nickel ion content of the growth medium. Mean hydrogen consumption in the light of nickel-supplemented cultures, containing DCMU (3-(3,4-dichlorophenyl)-1,1-dimethylurea) and glucose (photoheterotrophic conditions), was about 10 times higher than in control cultures supplemented with DCMU, but lacking glucose. Uptake of exogenous H did not influence growth or glucose consumption, but significantly increased acetylene reduction and the total N-content of the biomass, as well as ammonia excretion. It is postulated that the H uptake capability of the cyanobiont, and hence the nickel ion availability in the plant roots, may be important for the efficiency of N assimilation in plant-cyanobacteria symbioses.


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