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Effect of diel photoperiod on nitrogen metabolism of cultured and symbiotic zooxanthellae

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Abstract

Ammonium uptake and assimilation by zooxanthellae (Symbiodinium sp.) cultured with an excess of nitrate was enhanced in light. Uptake was decreased by the same amount when zooxanthellae were incubated in darkness either after 6 h pretreatment in light, or at the end of the dark period of a 12 h light: 12 h dark cycle. This suggested that short-term incubations of zooxanthellae were valid tests for light enhancement of dissolved inorganic nitrogen (DIN) uptake. Assimilation of ammonium into glutamine (Gln) and glutamate (Glu) was also decreased in darkness. During a 12 h light: 12 h dark cycle, free pools of both Gln and Glu fell quickly at the start of the light period, followed by steady increases until the beginning of the next dark period. Of the four other major components of free amino acid pools tested, only the nonprotein amino acid taurine showed diel fluctuations. Gln and Glu pools in zooxanthellae freshly isolated from reef-forming corals also showed differences between day and night, suggesting changes in patterns of DIN assimilation over the diurnal cycle.

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Communicated by J. Mauchline, Oban

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McAuley, P.J., Smith, V.J. Effect of diel photoperiod on nitrogen metabolism of cultured and symbiotic zooxanthellae. Marine Biology 123, 145–152 (1995). https://doi.org/10.1007/BF00350333

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  • DOI: https://doi.org/10.1007/BF00350333

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