Traffic Lights in Trichodesmium. Regulation of Photosynthesis for Nitrogen Fixation Studied by Chlorophyll Fluorescence Kinetic Microscopy1

From: Plant Physiology | Date: August 1, 2004| Author: Berman-Frank, Ilana; Ferimazova, Naila; Setlà ­ ¼ Kà k, Ivan; pper, Hendrik | Copyright information

We investigated interactions between photosynthesis and nitrogen fixation in the non-heterocystous marine cyanobacterium Trichodesmium IMS101 at the single-cell level by two-dimensional (imaging) microscopic measurements of chlorophyll fluorescence kinetics. Nitrogen fixation was closely associated with the appearance of cells with high basic fluorescence yield (F^sub 0^), termed bright cells. In cultures aerated with normal air, both nitrogen fixation and bright cells appeared in the middle ...

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