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THE DEVELOPMENT OF PUCCINIA GLUMARUM ERIKSS. AND HENN. IN WHEAT SEED,
ARMY BIOLOGICAL LABS FREDERICK MD
Pagination or Media Count:
The germination of infected seed stimulates the appearance of telia of P. glumarum on the fruit coat. Consequently an absence of telia on the seed is still not an indication of an absence of infection within. The mature or ripening telia are located in the fruit coat along the periphery of the caryopsis. Contrary to the data in the literature, the rust is found in the inner parts of the caryopsis, and particularly in the parenchymal cells of the scutellum in the embryo zone, but it is in the form of immature telio-receptacles. With the affliction of the seed by stripe rust, pathological changes occur a displacement of the pigmentary layer and the aleurone layer adjoining it, up to a complete disappearance of the pigmentary layer. Seed strongly infected with stripe rust will not germinate. Whether the microsomes are a form of the rusts existence or a product of the cellular metabolism is not clear, but their constant presence in the tissues of the plant and within the mycelium of the fungus indicates a direct connection to the rust. On the basis of the different life forms of P. glumarum discovered in the seed, which are characteristic for the varieties of rusts with an incomplete development cycle, it is possible to state the hypothesis that the entire development cycle of this fungus occurs on a single host-plant - the wheat. Author
APPROVED FOR PUBLIC RELEASE