Nitrogen and phosphorus limitation in cultured Alexandrium minutum Halim does not promote toxin production
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AuthorsFlynn, K. (Krystyna); Franco, J.M. (José Mariano); Fernández, P. (Pablo); Reguera, B. (Beatriz); Zapata, M. (Manuel); Flynn, K.J. (Kevin)
Editor/sLassus, P. (Patrick); Arzul, G. (Geneviève); Erard-Le-Denn, E. (Evelyne); Gentien, P. (Patrick); Marcaillou-Le-Baut, C. (Claire)
Studies of a high- and low-toxin strains of Alexandrium minutum isolated from Ría de Vigo fail to indicate profound C-N pbysiology differences in amino acid synthesis, biomass, growth rates or pigmentation, which might explain the 10 to 20 fold differences in PSP toxin content. Maximum toxin synthesis occurs during N-refeeding of N-deprived cells and thereafter toxin content covaries with free intracellular arginine. For both strains, toxin synthesis and toxin content on a cell or biomass basis decline during N or P deprivation. Implications for changes in the toxin content of field populations are discussed.