Production of volatile organic compounds (VOCs) by marine bacteria

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We evaluated the potential of a marine bacterium, Alteromonas macleodii, to produce CH_3I. Bacterium was incubated at temperatures (10,15,20,25,30℃) in marine broth 2216 with or without 1 mmol/L of potassium iodide. From 15 to 30℃, the higher the culture temperature, the more rapid the proliferation rate. Proliferation rate was not affected by potassium iodide. CH_3I was produced between 15 and 30℃ with potassium iodide. Optimum temperature for CH_3I production was 25℃. A. macleodii was also incubated at 25℃ in medium spiked with potassium iodide from 0.1 to 1000μmol/L. Results showed that the greater the concentration of spiked iodide, the more CH_3I was produced. Notably, production of CH_3I strongly increased at over 10μmol/L of potassium iodide. At the concentration of iodine in surface seawater (about 0.4μmon/L), the CH_3I produced was estimated to be about 0.2μmol/L. This suggested that marine bacteria would produce about 2-20 % of CH_3I in surface seawater (the total number of bacteria in medium was 100-1000 times higher than that seen in surface seawater).