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Summary: As observed for other cyanobacteria, net H2 formation or consumption in photoheterotrophic, N2-fixing cultures of Nostoc sp. strain Cc, a cyanobacterium isolated from Cycas circinalis, 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 H2 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 H2 uptake capability of the cyanobiont, and hence the nickel ion availability in the plant roots, may be important for the efficiency of N2 assimilation in plant-cyanobacteria symbioses.

The role of hydrogen metabolism in photoheterotrophic cultures of the cyanobacterium Nostoc sp. strain Cc isolated from Cycas circinalis L.