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Physiologic specialization in some cereal smuts



Physiologic specialization in some cereal smuts



Phytopath 18(12): 955-1003



In the group of species UstUago tritici, U. nuda, U. hordei, U. levis, and U. avenae from 5-18 physiologic forms were obtained for study. Morphological studies were based on color, topography, surface, consistency and type of margin in artificial cultures. Studies with U. tritici and U. nuda showed that various forms respond differently to temp. Pathogenicity tests were made using forms of Tilletia levis and T. tritici. Wide variations were found in the amount of smut developed on Pentad, Marquis, and Kota wheat and on Einkorn. Experiments with barley regarding resistance to U. hordei gave similar results. New physiologic forms of the smut fungi are developed, probably constantly, by hybridization or mutation.

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