Hydrogen evolution by photobleached Anabaena cylindrica

I. Laczkó, K. Barabás

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

We have studied the evolution of hydrogen by photobleached filaments of the heterocystous bluegreen alga Anabaena cylindrica. The photobleached cells became orange-yellow due to the heavy accumulation of carotenoids. We found that the yellow filaments produced much larger amounts of hydrogen than the normal, green ones, while the nitrogenase activity responsible for hydrogen evolution increased to a lesser extent. We suggest that a reversible hydrogenase activity induced in photobleached filaments is responsible for the excess amount of hydrogen. 3-(3′,4′-dichlorophenyl)-1,1-dimethyl urea (DCMU) inhibits the hydrogen evolution of the yellow filaments which produce much more oxygen and fix less CO2 than the green filaments. Therefore we consider the water to be a possible electron source for this hydrogenase. The low efficiency of light energy conversion (0.3%) in nitrogenase-catalyzed H2 evolution (Laczkó, 1980 Z. Pflanzenphysiol. 100, 241-245) is increased to 1.5-2% by the appearance of the reversible hydrogenase activity.

Original languageEnglish
Pages (from-to)312-316
Number of pages5
JournalPlanta
Volume153
Issue number4
DOIs
Publication statusPublished - Dec 1981

Fingerprint

Anabaena cylindrica
hydrogen
ferredoxin hydrogenase
Hydrogen
Nitrogenase
nitrogenase
algae
Hydrogenase
energy conversion
Carotenoids
Urea
carotenoids
urea
electrons
Electrons
Oxygen
oxygen
Light
Water

Keywords

  • Anabaena
  • Cyanobacteria
  • Hydrogen evolution
  • Photobleaching
  • Photolysis
  • Reversible hydrogenase

ASJC Scopus subject areas

  • Plant Science

Cite this

Hydrogen evolution by photobleached Anabaena cylindrica. / Laczkó, I.; Barabás, K.

In: Planta, Vol. 153, No. 4, 12.1981, p. 312-316.

Research output: Contribution to journalArticle

Laczkó, I. ; Barabás, K. / Hydrogen evolution by photobleached Anabaena cylindrica. In: Planta. 1981 ; Vol. 153, No. 4. pp. 312-316.
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