Effect of Iron, Zinc, Manganese and Calcium on the Growth of Various Strains of Streptomyces

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Abstract
A study was made of the effect of four metals, iron, zinc, manganese, and calcium, on the growth of eight different strains of Streptomyces grown in the same medium in shake flasks. The design of the experiments was factorial in order to permit the analysis of the effect of possible interactions. Iron was the only element that permitted a substantial increase in mycelial weight when added singly. Zinc and the interaction iron-zinc had a marked favorable effect on growth. Further experimentation will be needed to elucidate the effect of manganese and calcium. The rate of growth and the rate of lysis of S. fradiae 3535 was found to vary with the metal composition of the medium; calcium delayed lysis. The final level of growth attained by different strains, under comparable environmental conditions, varied greatly, indicating significant strain differences in quantitative and/or qualitative mineral requirements.

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