Počet záznamů: 1

Biological dinitrogen fixation by selected soil cyanobacteria as affected by strain origin, morphotype, and light conditions

  1. 1.
    0349707 - BC-A 2011 RIV CZ eng J - Článek v odborném periodiku
    Hrčková, K. - Šimek, Miloslav - Hrouzek, Pavel - Lukešová, Alena
    Biological dinitrogen fixation by selected soil cyanobacteria as affected by strain origin, morphotype, and light conditions.
    Folia Microbiologica. Roč. 55, č. 5 (2010), s. 467-473 ISSN 0015-5632
    Grant CEP: GA MŠk LC06066; GA AV ČR IAA600660605
    Výzkumný záměr: CEZ:AV0Z60660521; CEZ:AV0Z50200510
    Klíčová slova: biological dinitrogen fixation * soil cyanobacteria * strain origin
    Kód oboru RIV: EH - Ekologie - společenstva
    Impakt faktor: 0.977, rok: 2010

    The potential for N2 fixation by heterocystous cyanobacteria isolated from soils of different geographical areas was determined as nitrogenase activity (NA) using the acetylene reduction assay. Morphology of cyanobacteria had the largest influence on NA determined under light conditions. NA was generally higher in species lacking thick slime sheaths. The highest value (1446 nmol/h C2H4 per g fresh biomass) was found in the strain of branched cyanobacterium Hassalia (A Has 1) from the polar region. A quadratic relationship between NA and biomass was detected in the Tolypothrix group under light conditions. The decline of NA in dark relative to light conditions ranged from 37 to 100 % and differed among strains from distinct geographical areas. Unlike the NA of temperate and tropical strains, whose decline in dark relative to light was 24 and 17 %, respectively, the NA of polar strains declined to 1 % in the dark.
    Trvalý link: http://hdl.handle.net/11104/0189869