Abstract
Anabaena torulosa exhibited fructose-dependent growth, heterocyst differentiation and N2 fixation in nitrate-free (diazotrophic) cultures in photoheterotrophic and chemoheterotrophic conditions. The incorporation of nitrate into such cultures inhibited the formation of heterocysts and N2 fixation. The rate of NO −3 uptake byA. torulosa in photoautotrophic, photoheterotrophic and chemoheterotrophic conditions was similar but it increased by 100% in phototrophic conditions. The activity of glucose-6-phosphate dehydrogenase was found to be maximum in phototrophic and photoheterotrophic conditions. Ferredoxin-NADP+ reductase, nitrate reductase and glutamate-ammonia ligase activities suggest that nitrate utilization takes place in nonphotosynthetic conditions.
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Sarma, T.A., Khattar, J.I.S. Photoheterotrophic and chemoheterotrophic dinitrogen fixation and nitrate utilization by the cyanobacteriumAnabaena torulosa . Folia Microbiol 39, 404–408 (1994). https://doi.org/10.1007/BF02814447
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DOI: https://doi.org/10.1007/BF02814447