Co-cultivation of N2-fixing heterocystous Cyanobacteria and rice cultivars in liquid and sand cultures
2000
Drobac, A.V. | Svircev, Z.B. | Petrovic, O.V. (University of Novi Sad, Novi Sad (Yugoslavia). Institute of Biology)
A large variety of cyanobacterial species capable of fixing atmospheric nitrogen have been identified. In this paper, we present the data obtained during the co-cultivation of 12 cyanobacterial isolates (Nostoc and Anabaena strains), previously isolated from different soil types of the Vojvodina Province (Yugoslavia), and four rice (Oryza sativa) cultivars in liquid and sand cultures. The level of cyanobacterial influence on rice, considering the contribution to plant growth and development, as well as the N content of the rice plant were practically identical in the liquid and sand media. Also, diverse cyanobacterial influences were observed on the length, dry weight and N content of roots and shoots during the co-cultivation of rice cultivars and Cyanobacteria in sand culture. The production and liberation of N compounds by Cyanobacteria seem to be related to specific growth conditions created by the co-cultivation with a specific rice cultivar. Not only the nitrogen fixation, but also biologically active substances of cyanobacterial origin probably have an important role in co-cultivation.
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