Abstract
Abstract Scanning electron microscopy of the saprophytic fungus Cladosporium macrocarpum on barley leaves revealed characteristic bar‐shaped appressoria. They were almost always located either above a stomatal opening or above the anticlinal cell walls. It was shown with light microscopy that the fungus was able to penetrate via stomatal openings. No successful direct penetrations were observed. The barley tissue responded to direct penetration attempts by formation of papillae and accumulation of fluorescent compounds. Fluorescence microscopy revealed fluorescent compounds in papillae, haloes, hypersensitively reacting epidermal cells, mesophyll cells, and in stomatal areas. The induced resistance reactions are similar to those described earlier for, pathogenic fungi, indicating that they are part of general resistance phenomena.
Published Version
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