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    Extracellular products of photosynthesis in a tropical environment

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    Proc_Indian_Natl_Sci_Acad_53B_481.pdf (380.7Kb)
    Date
    1987
    Author
    Gomes, H.R.
    Pant, A.
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    Abstract
    Extracellular products in the Arabian Sea averaged 0.42 g/cm2/day and represented 35% of the total carbon fixed by phytoplankton. No seasonal changes are observed during the two seasons i.e. premonsoon (Jan-Feb) and onset of southwest monsoon (April - May). Maximum extracellular production occurred at the surface in contrast to the sub-surface maxima in particulate production. Percentage extracellular release was higher (35%) in the nutrient limited waters of the Arabian Sea as compared to only 7.6% in the estuarine waters of Dona Paula, Goa, where nutrients are seldom limiting. A partially modified radiochromatographic method was used to identify some of the photosynthetic products released. Glycollic acid, a product of photorespiration and one of the more commonly occurring products of excretion did not appear to be a major excretory compound. It constituted only 2-32% of the total radioactivity and was present in only 34% of the samples. Citrate was tentatively identified as another product of extracellular release. Unidentified acids comprised 2-78% of the total radioactive material recovered from the phytoplankton exudate
    URI
    http://drs.nio.org/drs/handle/2264/6038
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