The Effect of Several Protein Amino Acids and Some Inorganic Nitrogen Sources on the Growth of Sphagnum nemoreum
1975; Wiley; Volume: 35; Issue: 3 Linguagem: Inglês
10.1111/j.1399-3054.1975.tb03892.x
ISSN1399-3054
Autores Tópico(s)Lichen and fungal ecology
ResumoAbstract The nitrogen metabolism of a bog moss, Sphagnum nemoreum Scop., has been studied in aseptic cultures. The effect of several protein amino acids, especially those found in peat, has been investigated. NH 4 NO 3 (1.25 m M ) was the best nitrogen source but NH 4 + ions were more effectively utilized than NO 3 − ions when given as the only nitrogen source. Some of the amino acids (2.5 m M ) allowed fairly satisfactory growth (arginine and alanine) when given as the only nitrogen source, but some of them were not utilized at all (leucine, lysine, isoleucine and methionine). Given at low concentrations (0.001 and 0.25 m M ) together with NH 4 NO 3 (2.5 m M ), most of the protein amino acids failed to reveal any growth‐promoting or ‐inhibiting effect. Only lysine (0.25 m M ) clearly inhibited growth under these conditions. The nitrogen metabolism of Sphagnum nemoreum seems to be rather flexible and this species is more tolerant of organic nitrogen, especially hydroxyproline, than the higher plants.
Referência(s)