Amino acid content in relation to growth of Helminthosporium maydis Nishikado and Miyake

During the growth period of thirty days, altogether thirteen amino acids showed their presence and activity in the developing culture of Helminthosporium maydis Nishikado and Miyake. Initiation of growth by the 5th day coincided with the appearance of profuse amounts of dl-alanine and serine, and moderate amounts of valine, threonine, and aspartic acid. The thirteen amino acids, which appeared in full complement by the 15th day, were actively engaged in accelerating mycelial accumulation. Beyond this growth period, there was a decline in the amino acids.

Varying spectrum of amino acids in relation to growth in Helminthosporium oryzae Breda de Haan

Fifteen amino acids were detected in the developing mycelium of Helminthosporium oryzae Breda de Haan. During the first fortnight of mat accumulation, which was more rapid, a marked influence of amino acids on the growth pattern was discernible. A high level maintenance of dl-alanine l-cysteine, l-leucine/isoleucine, threonine, tyrosine, glutamic, and aspartic acids, as well as an increase in the amount of gamma-aminobutyric acid and proline during the first fortnight of culture development were effective in initiating growth and keeping it at a more rapid pace. Glutamine and methionine appeared in the latter half of fungal growth. During this slow pace of mycelial accumulation in the latter half period, there was a general and overall decline in the amount of most of the amino acids. The amino acids started disappearing from the mycelial extract from the 20th day onwards till the end of the 30th day. In the culture filtrate, aspartic acid and proline appeared during the rapid growth phase and dl-alanine and methionine during the slower phase.

Fluctuation in amino-acid constituents of a developing culture of Sclerotium rolfsii Sacc. and its relation to growth

Altogether eleven amino acids were detected in the mycelial extract of Sclerotium rolfsii Sacc. Here, with the appearance of aspartic acid and homoserine on the 5th day, growth was initiated. The maximum mycelial output, achieved by the 15th day, coincided with the detection of leucine/isoleucine and valine in the mycelial extract and of methionine in the culture filtrate. Lysine and gamma-amino-butyric acid which appeared late in the mycelium did not contribute to its growth. Tyrosine, an aromatic amino acid, was present only in the culture filtrate and not in the fungal extract. Aspartic acid, homoserine, and methionine were profusely produced in the culture filtrate during the decline of mycelial growth, suggesting that these amino acids could be fungal autolysis products as well.