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Chlorophyll a fluorescence in marine centric diatoms: Responses of chloroplasts to light and nutrient stress

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Abstract

Observations at sea of large variations in the cellular fluorescence of phytoplankton prompted a study of the fluorescence responses in marine diatoms to light and nutrient stress. When older cultures of Lauderia borealis were exposed to intense light, the in vivo fluorescence of chlorophyll a declined within the first 2 min of exposure. This initial response to light stress appeared to be correlated with a contraction of the chloroplasts. Continued exposure led to a second decline in fluorescence, which required 30 to 60 min for completion. A movement of chloroplasts to the valvar ends of the cell caused this secondary response. Both the contraction and intracellular movement of chloroplasts appeared to be related to both photoinhibition of photosynthesis and diel fluctuations in cellular fluorescence. An investigation of continuous cultures of Cyclotella nana showed that in vivo chlorophyll a fluoresced more strongly in nitrogen-starved cells than in enriched ones. Photoinhibition of cellular fluorescence also increased with the cell's state of nitrogen deficiency.

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  1. D. A. Kiefer

    Present address: Institute of Marine Resources, University of California, San Diego, La Jolla, California, USA

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    1. D. A. Kiefer
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    Communicated by J. Bunt, Miami.

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    Kiefer, D.A. Chlorophyll a fluorescence in marine centric diatoms: Responses of chloroplasts to light and nutrient stress. Mar. Biol. 23, 39–46 (1973). https://doi.org/10.1007/BF00394110

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    • DOI: https://doi.org/10.1007/BF00394110

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