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International Journal on Algae
SJR: 0.216 SNIP: 0.322 CiteScore™: 0.4

ISSN Imprimir: 1521-9429
ISSN En Línea: 1940-4328

International Journal on Algae

DOI: 10.1615/InterJAlgae.v8.i3.70
pages 286-293

Effects of amino acids on the blue-green alga (cyanobacteria) Tolypothrix scytonemoides (Gardner) Geitler

Uma Maheshwari Rajendran
Center for Advanced Studies in Botany, University of Madras Guindy Campus, Chennai-600 025, India
Elango Kathirvel
Center for Advanced Studies in Botany, University of Madras Guindy Campus, Chennai - 600 025, India
Anand Narayanaswamy
Center for Advanced Studies in Botany, University of Madras Guindy Campus, Chennai - 600 025, India


Most of the amino acids tested enhanced the growth of Tolypothrix scytonemoides (Gardner) Geitler at 1 mM, but at 10 mM these amino acids completely inhibited growth. The organism grew at both 1 and 10 mM of cysteine and methionine but when arginine, asparagine and aspartate were tested an inhibitory effect at both concentrations were observed. Maximum photosynthetic rate was observed in the presence of 1 mM tyrosine and respiratory rate was greatest in the presence of 1 mM valine. Aspartate, serine, threonine and tyrosine, at 1 mM caused complete inhibition of nitrogenase. The glutamine synthetase activity was highest in the cells of an unamended medium. The amount of exogenous carbohydrates was greatest in cells grown in the presence of 1 mM methionine. Considerably higher amounts of carbohydrates were also obtained with cells grown in 1 mM of glycine, histidine, lysine, phenylalanine, tryptophan, and 10 mM of methionine. Cells grown in asparagine, aspartate, serine, and threonine did not release carbohydrates.

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