Nutrition during Spore Production and the Inoculum Potential of Helminthosporium maydis Race T

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Abstract
Lesion size and lesion number per unit of inoculum were used to measure the inoculum potential of H. maydis Race T spores produced on various media. These included potato-dextrose agar, V-8 juice agar, and a glucose-mineral salts agar amended with different concentrations of N-containing compounds or with maize [Zea mays] leaves. Inoculum potential was affected by both N source and concentration. Spores produced on maize leaves and the maize-leaf + mineral salts agar had a higher inoculum potential than spores produced on the other media. Spores grown on media producing high inoculum potential exhibited more rapid spore germination, higher germination percentages and greater appressorium formation than did spores grown on media of low inoculum potential. Spore size, shape, color, and number of septations were also affected by the medium.

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