Flash oxygen yield patterns of autotrophically and photoheterotrophically grown Chlamydobotrys stellata in the presence and absence of lipophilic acceptors

W. Wiessner, Z. Deák, D. Mende, S. Demeter

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The obligate phototrophic green alga Chlamydobotrys stellata does not evolve oxygen when grown in CO2-free atmosphere on acetate. With the application of the lipophilic acceptor 2,6-dichloro-p-benzoquinone it was investigated whether this phenomenon is caused by the inactivation of the water-splitting system or by an inhibition of the electron transport chain. It was found that in the presence of DCQ, the photoheterotrophic alga exhibited a normal period-4 flash oxygen pattern, but the steady state yield was only 25% of that measured in the autotrophic cells. After DCQ addition, the initial distribution of S-states and the values of the transition probabilities proved to be the same in the autotrophic and photoheterotrophic algae. These results indicate that photoheterotrophic growth conditions inhibit the electron transport of Chl. stellata behind the acceptor site of DCQ, but the water-splitting system remains active with a reduced oxygen evolving capacity.

Original languageEnglish
Pages (from-to)37-44
Number of pages8
JournalPhotosynthesis Research
Volume29
Issue number1
DOIs
Publication statusPublished - Jul 1991

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algae
Algae
Oxygen
Electron Transport
oxygen
benzoquinones
Chlorophyta
Water
electron transport chain
Atmosphere
electron transfer
inactivation
Acetates
water
acetates
Growth
cells

Keywords

  • acetate
  • Chlamydobotrys stellata
  • CO-depletion
  • lipophilic electron acceptor
  • oxygen evolution

ASJC Scopus subject areas

  • Plant Science

Cite this

Flash oxygen yield patterns of autotrophically and photoheterotrophically grown Chlamydobotrys stellata in the presence and absence of lipophilic acceptors. / Wiessner, W.; Deák, Z.; Mende, D.; Demeter, S.

In: Photosynthesis Research, Vol. 29, No. 1, 07.1991, p. 37-44.

Research output: Contribution to journalArticle

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AB - The obligate phototrophic green alga Chlamydobotrys stellata does not evolve oxygen when grown in CO2-free atmosphere on acetate. With the application of the lipophilic acceptor 2,6-dichloro-p-benzoquinone it was investigated whether this phenomenon is caused by the inactivation of the water-splitting system or by an inhibition of the electron transport chain. It was found that in the presence of DCQ, the photoheterotrophic alga exhibited a normal period-4 flash oxygen pattern, but the steady state yield was only 25% of that measured in the autotrophic cells. After DCQ addition, the initial distribution of S-states and the values of the transition probabilities proved to be the same in the autotrophic and photoheterotrophic algae. These results indicate that photoheterotrophic growth conditions inhibit the electron transport of Chl. stellata behind the acceptor site of DCQ, but the water-splitting system remains active with a reduced oxygen evolving capacity.

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