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Effect of darkness and CO2 starvation on NH4+ and NO3 assimilation in the unicellular alga Cyanidium caldarium
Authors:Vittoria Di  Martino Rigano  Vincenza Vona  Catello Di  Martino Carmelo Rigano
Institution:Dipartimento di Biologia Vegetale, Univ. di Napoli, Via Foria 223, I-80I39, Napoli, Italia.
Abstract:Cyanidium caldarium (Tilden) Geitler, a non-vacuolate unicellular alga, resuspended in medium flushed with air enriched with 5% CO2, assimilated NH4+ at high rates both in the light and in the dark. The assimilation of NO3?, by contrast, was inhibited by 63% in the dark. In cell suspensions flushed with CO2-free air, NH4+ assimilation decreased with time both in the light and in the dark and ceased almost completely after 90 min. The addition of CO2 completely restored the capacity of the alga to assimilate NH4+. NO3? assimilation, by contrast, was 33% higher in the absence of CO2 and was linear with time. It is suggested that NO3? and NH4+ metabolism in C. caldarium are differently controlled in response to the light and carbon conditions of the cell.
Keywords:Carbon nutrition  nitrogen assimilation
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