Essentiality of Calcium in the Nutrition of Fungi

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Abstract
Omission of Ca from a nutrient soln. caused maximum decreases in yield of Rhizoc-tonia. Of 15 trace elements studied, none could replace Ca in the nutrition of this sp. Only strontium gave partial replacement sufficing for abt. 50% growth. The amts. of Ca needed for maximum yields ranged from 2 to 6 ppm., whereas the minimum amt. of Mg needed was 14 ppm. Ca might thus be considered a micronutrient. According to the data, the causes for pathogenicity are dissociated from mineral requirements.