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Ferredoxin and flavodoxin in eastern Antarctica pack ice

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Abstract

The presence, concentration and distribution of the iron regulated proteins, ferredoxin and flavodoxin, was investigated in pack ice off eastern Antarctica using SDS-PAGE gels. Bands corresponding to ferredoxin and/or flavodoxin were observed in all but eight of the 102 core sections analysed. Flavodoxin was found in most of the ice samples and was strongly correlated with chlorophyll a standing stock. The widespread distribution of flavodoxin here is not thought to indicate iron-limitation as many of the dominant species, such as Fragilariopsis cylindrus, Cylindrotheca closterium, are known to produce this protein under iron-replete conditions and thus the significant correlation between flavodoxin and biomass is likely to be the result of widespread constitutive flavodoxin expression among the diatoms that commonly inhabit sea ice. High concentrations of ferredoxin were predominantly derived from core sections on the floes closest to the continent and also in the upper portion of these floes. There was a consistent lack of ferredoxin expression in the high biomass bottom communities. The absence of ferredoxin is likely to indicate a reduced supply of iron but the significance of this reduced iron supply cannot be inferred on the basis of protein expression alone. Furthermore, in the present study the observed variability in the flavodoxin:ferredoxin ratio may not simply reflect the iron nutritional status of the community, but probably results from changes in the abundance of species capable of expressing ferredoxin.

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  1. Institute of Antarctic and Southern Ocean Studies, University of Tasmania, Private Bag 77, Hobart, TAS, Australia

    Andrew Pankowski & Andrew McMinn

  2. Department of Environment, Water, Heritage and Arts, King Edward Terrace, Parkes, 2600, Australia

    Andrew Pankowski

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  1. Andrew Pankowski
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  2. Andrew McMinn
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Correspondence to Andrew Pankowski.

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Pankowski, A., McMinn, A. Ferredoxin and flavodoxin in eastern Antarctica pack ice. Polar Biol 31, 1153–1165 (2008). https://doi.org/10.1007/s00300-008-0451-y

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