Flavodoxin as an in situ marker for iron stress in phytoplankton

Article Abstract:

A biochemical marker, such as flavodoxin, can be used to map the physiological response to iron stress in natural populations. This is possible because flavodoxin expression in microorganisms is controled by the supply of iron. Flavodoxin evaluations along a 900-km east-west transect in the northeastern subarctic Pacific show significant differences in iron stress with cells to the east of the 135 degrees west meridian being iron replete. Immunostaining of single cells shows flavodoxin to be present within the chloroplasts of diatoms.

Usage, Observations, Composition, Proteins, Microorganisms, Iron, Iron (Metal), Sea-water, Seawater

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Iron findings

Article Abstract:

The satellite images were used to pinpoint an annually recurring bloom near Kerguelen. The findings reveal that the presence of zooplankton aids the remineralization of both iron and carbon, and thus reduces carbon export while resupplying iron to the phytoplankton.

Zooplankton

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Genome sequences from the sea

Article Abstract:

Genomic studies lead to a better understanding of ecology, biological efficiency and biogeochemistry. The genomes of four strains of phytoplankton are described, which reveal their genetic adaptations to distinct marine niches.

Study and teaching, Molecular genetics, Genomics

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