Life cycle of rust fungus, Puccinia metanarthecii
2006
Honkura, R.(Miyagi Univ., Sendai (Japan). School of Food, Agricultural and Environmental Sciences) | Ehara, Y.
In the life cycle of the fungus, Puccinia metanarthecii produced five morphologically and functionally different spore states; basidiospore on basidium, spermatium in spermogonium, aeciospore in aecium, uredospore in uredinium and teliospore in telium in that order. In May, basidiospores were produced on basidia which had been produced on germinated teliospores, overwintered on the surface of infected leaves of Aletris luteoviridis. Basidiospores attacked and infected the leaves of Ixeris dentata. Orange-colored spermagonia and spermatia were formed on the upper leaf surface and, after fertilization, orange-yellow aecial cups were produced on the concentric rings on the lower side of the leaves. In June, aeciospores formed in aecial cups infected leaves of Aletris luteoviridis. The symptoms of the leaves appeared as white-yellowish circular spots on the upper side of the leaves. Uredospores were produced on the lower side of the spots of the leaves. The fungus spread in a short distant from plants to plants by uredospores and started new infections. When the plants matured after the middle of July, teliospores were produced on the same spots of the leaves produced uredospores. Teliospores were the overwintered stage and never germinated until next spring.
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