Photochemical production and behavior of hydroperoxyacids in heterotrophic bacteria attached to senescent phytoplanktonic cells.

The highly significant ( n = 5, r 2 = 0.99, p -value < 0.001) correlation observed ( Figure 5 ) between the amounts of degraded chlorophyll and produced cis -vaccenic acid photoproducts, and the lack of cis -vaccenic photoproducts in the bacterial control strongly suggest that the photooxidation of cis -vaccenic acid in bacteria is associated with the photosensitizing properties of chlorophyll a in senescent E. huxleyi cells.

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Cellular damages resulting from the transfer of substantial amounts of 1 O 2 from phytoplanktonic cells to their attached bacteria may be significant due to the lack of efficient photoprotective and antioxidant systems in these microorganisms [ 25 ], and can affect their capability in degrading particulate organic matter (POM).

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