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  Epiphytic bacteria on the Antarctic ice diatom Amphiprora kufferathii Manguin cleave hydrogen peroxide produced during algal photosynthesis

Hunken, M., Harder, J., & Kirst, G. O. (2008). Epiphytic bacteria on the Antarctic ice diatom Amphiprora kufferathii Manguin cleave hydrogen peroxide produced during algal photosynthesis. Plant Biology, 10(4), 519-526.

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Harder8.pdf (Publisher version), 256KB
 
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Hunken, M., Author
Harder, J.1, Author              
Kirst, G. O., Author
Affiliations:
1Department of Microbiology, Max Planck Institute for Marine Microbiology, Max Planck Society, ou_2481695              

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Free keywords: Antarctic; diatom; epiphytic bacteria; hydrogen peroxide; photosynthesis; proteobacteria; sea ice
 Abstract: The Antarctic ice diatom Amphiprora kufferathii Manguin is always accompanied by epiphytic bacteria in its natural habitat. To investigate the nature of this relationship, axenic cultures of A. kufferathii were obtained by ampicillin treatment. Diatom cultures without bacteria were less dense. The bacteria were shown to consume hydrogen peroxide produced by the diatom during photosysnthesis and algal photosynthesis after a hydrogen peroxide shock recovered faster in the presence of bacteria. Three proteobacterial strains isolated from a culture of A. kufferathii were phylogenetically affiliated with the alphaproteobacterial genus Sulfitobacter, the gammaproteobacterial genus Colwellia, and the genus Pibocella of the Bacteriodetes. Native protein gel electrophoresis and enzyme activity staining revealed the presence of superoxide dismutase and glutathione reductase in the isolated bacteria and in A. kufferathii cultures. Catalase was detected in bacterial extracts but not in axenic cultures of A. kufferathii. These observations indicate that the epiphytic bacteria make a significant contribution to the diatom’s antioxidative defences. The relationship between the bacteria and A. kufferathii seems to be beneficial for both partners and enhances growth of Amphiprora in the sea ice.

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Language(s): eng - English
 Dates: 2008-07
 Publication Status: Published in print
 Pages: 8
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 423424
ISI: 000256690100012
 Degree: -

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Title: Plant Biology
Source Genre: Journal
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Publ. Info: Stuttgart : G. Thieme Verlag
Pages: - Volume / Issue: 10 (4) Sequence Number: - Start / End Page: 519 - 526 Identifier: ISSN: 1435-8603
CoNE: https://pure.mpg.de/cone/journals/resource/954925624284