Abstract
The infection structures of gladiolus rust, Uromyces transversalis, on and in host leaves of the susceptible gladiolus cultivar (Goldfield) and resistant species (Gladiolus daleni) and in leaves of the nonhost (Zea mays) were examined by scanning and transmission electron microscopy. The number of germinated urediospores that formed appressoria on the resistant host was significantly fewer than the number formed on the susceptible host. The major determinant of resistance in the host was manifested in the significant proportion of substomatal vesicles with primary hyphae that aborted before the formation of haustorial mother cells and/or secondary hyphae (...)
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