Iodomethane production by two important marine cyanobacteria: Prochlorococcus marinus (CCMP 2389) and Synechococcus sp. (CCMP 2370)

Hughes, C, Franklin, DJ and Malin, G (2011) Iodomethane production by two important marine cyanobacteria: Prochlorococcus marinus (CCMP 2389) and Synechococcus sp. (CCMP 2370). Marine Chemistry, 125 (1-4). pp. 19-25.

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Abstract

Iodomethane (CH3I) production by Prochlorococcus marinus (CCMP 2389) and Synechococcus sp. (CCMP 2370) was investigated using laboratory cultures. In contrast to Synechococcus, where no trace gas production was observed, P. marinus cells produced CH3I. The rate of CH3I production by P. marinus was found to vary depending on the physiological state of the cells as defined by photosynthetic health (Fv/Fm) measurements, SYTOX Green staining (which evaluates membrane permeability) and calculated in vivo fluorescence per cell (a proxy of pigment content per cell). The highest total cell normalised production rates (7189 [range 5225-11,517] molecules CH3I cellTotal day-1) were observed when Fv/Fm was =0.3 and =75% of the cells were SYTOX Green labelled. Relatively lower rates of CH3I production (146 [103-267] molecules CH3I cellTotal day-1) were observed when Fv/Fm was =0.5 and =20% of the P. marinus cells were SYTOX Green labelled. Our results suggest that discrepancies in the CH3I production rates by Prochlorococcus observed between previous studies could be due to differing cell physiology. Calculations are presented which suggest that Prochlorococcus could contribute significantly to CH3I production in the eastern tropical Atlantic Ocean. This study highlights the importance of considering cell physiological state when determining trace gas production rates in laboratory culture and extrapolating them to the natural environment.

Item Type: Article
Faculty \ School: Faculty of Science > School of Environmental Sciences
Related URLs:
Depositing User: Rosie Cullington
Date Deposited: 21 Mar 2011 11:02
Last Modified: 21 Apr 2020 16:47
URI: https://ueaeprints.uea.ac.uk/id/eprint/26748
DOI: 10.1016/j.marchem.2011.01.007

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