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VERTICAL MIGRATION BY RHIZOSOLENIA SPP. (BACILLARIOPHYCEAE): IMPLICATIONS FOR FE ACQUISITION
R Michael L McKay1, Tracy A Villareal1, Julie La Roche1
1Department of Biological Sciences, Bowling Green State University, Bowling Green, Ohio 43403Marine Science Institute, The University of Texas at Austin, Port Aransas, Texas 78373Department of Marine Microbiology, Institut für Meereskunde, Kiel D-24105, Germany.
Journal of Phycology
|March 16, 2018
Summary
Large diatoms like Rhizosolenia spp. may use vertical migration to access nitrogen. This study found flavodoxin, not ferredoxin, in Rhizosolenia, suggesting constitutive expression possibly due to iron deficiency.
Area of Science:
- Marine biology
- Oceanography
- Biogeochemistry
Background:
- Large diatoms, such as Rhizosolenia spp., exhibit buoyancy-mediated vertical migration to access deep-water nutrients like nitrogen.
- The extent to which these diatoms satisfy their iron requirements through this migratory behavior remains unclear.
Purpose of the Study:
- To investigate whether Rhizosolenia spp. meet their iron needs via vertical migration.
- To determine the expression patterns of flavodoxin and ferredoxin in Rhizosolenia under varying iron conditions.
Main Methods:
- Field sampling in the North Pacific gyre during summer 1996.
- Western blot analysis to detect flavodoxin and ferredoxin in collected samples.
- Laboratory cultivation of Rhizosolenia formosa with controlled iron concentrations.
Main Results:
- All field samples, irrespective of buoyancy or location, contained flavodoxin but lacked ferredoxin.
- Laboratory-grown Rhizosolenia formosa consistently accumulated only flavodoxin across all tested iron levels.
- Iron concentration had minimal impact on physiological and photochemical parameters in R. formosa cultures.
Conclusions:
- Flavodoxin appears to be constitutively expressed in some Rhizosolenia species.
- This constitutive flavodoxin expression may be linked to chronic iron limitation in natural oceanic environments.
- Vertical migration might not be a primary mechanism for satisfying iron requirements in these diatoms.
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