The value of 21 amino acids as nitrogen sources for Phytophthora cactorum and P. heveae

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Abstract
The value of 21 amino acids as nitrogen sources for Phytophthora cactorum (Leb. and Cohn) Schroet. and P. heveae Thompson has been studied using the dry weights of mycelium, changes in the pH values of the culture media, and the accumulation of ammonium nitrogen in the culture media as the criteria. Two concentrations of each amino acid were used to furnish 106 and 424 mg N/liter. The three parameters mutually supported each other in dividing the amino acids into two groups, poor and good.The following amino acids were poor sources of nitrogen for both species: L-hydroxyproline, L-isoleucine, L-leucine, L-lysine, L-methionine, and L-tryptophan. L-Phenylalanine was a good amino acid for P. cactorum, and a poor amino acid for P. heveae. L-Cysteine and L-valine were good sources of nitrogen for P. heveae, but poor nitrogen sources for P. cactorum. The following amino acids were good sources of nitrogen for both species: L-α-alanine, L-arginine, L-asparagine, L-aspartic acid, L-glutamine, L-glutamic acid, glycine, L-histidine, L-proline, L-serine, L-threonine, and L-tyrosine.

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