Mineral nutrition of <i>Pythium marinum</i>, a marine facultative parasite

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Abstract

<jats:p> Pythium marinum Sparrow, isolated from lesions on Porphyra miniata, required Na<jats:sup>+</jats:sup>, Ca<jats:sup>2+</jats:sup>, and Mg<jats:sup>2+</jats:sup> in quantities far exceeding those reported to be required by terrestrial species of Pythium. Unlike most of its terrestrial counterparts, P. marinum required alkaline pH values for good growth, with a pH of 7.8 providing maximum growth under the conditions examined. The requirement for large amounts of Na<jats:sup>+</jats:sup> ions appeared to have a specific nutritional basis rather than a purely osmotic function. Growth at various temperatures indicated that the fungus is a facultative psychrophile with the optimum growth temperature between 15 and 20 °C. The nutritional data show that P. marinum is able to grow in a wide range of salt concentrations and is well adapted to the marine environment. </jats:p>

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