Abstract
A simple and sensitive spectrophotometric method of measuring electron transfer in the transport system (ETS) in marine phytoplankton has been developed and characterized. The assay is based on the reduction of the tetrazolium salt 2-(p-iodophenyl)-3-(p-nitrophenyl)-5-phenyl tetrazolium chloride (INT) by homogenates in the presence of the nonionic detergent Triton X-100. The simplicity and sensitivity of this assay have considerable advantage over existing methods of measuring ETS activity in marine samples where numerous assays must be rapidly carried out on samples which often demonstrate low activities. Several established substrates and inhibitors of electron transport in the ETS were investigated, and each is discussed in relation to the site of INT reduction in the diatoms Skeletonema costatum and Chaetoceros debilis and in the unicellular green alga Dunaliella tertiolecta. The results from these studies suggest that the maximum rate of electron transport, V max, is measured in each case.
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Communicated by J.S. Pearse, Santa Cruz
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Kenner, R.A., Ahmed, S.I. Measurements of electron transport activities in marine phytoplankton. Marine Biology 33, 119–127 (1975). https://doi.org/10.1007/BF00390716
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DOI: https://doi.org/10.1007/BF00390716