SUPPRESSION AND STIMULATION OF MYCELIAL GROWTH OF PHYTOPHTHORA CRYPTOGEA BY CERTAIN THIAMINE-REQUIRING AND THIAMINE-SYNTHESIZING BACTERIA

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Abstract
Preculturing a synthetic medium with bacteria of the genus Arthrobacter reduced growth of Phytophthora cryptogea. The growth reduction appeared to be due chiefly to utilization of thiamine by the bacteria. However, there was some evidence that these bacteria also removed other fungal nutrients from the medium. When the bacteria were streaked on synthetic agar media, radial growth of the fungus on the same plates was reduced only when the thiamine concentration was low. Certain other bacteria stimulated mycelial growth of P. cryptogea in a thiamine-deficient medium by producing either thiamine or thiamine-like substances.