> The uredinium and telium of black stem rust on wheat
The uredinium and telium of black stem rust on wheat
Updated on 05/12/2016
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Wheat can be infected by black stem rust. The left one is uredinium, which is the red stage (spring and summer), with one cell per urediniospore. The right one is telium, which is the black stage (winter), with two cells per teliospore.
Science Centre 295, CUHK
For the urediniospores, they can infect wheat repeatedly, by spreading to the other part of same wheat or different one and forming a new uredinium. In addition, uredinia (brick-red) are commonly found at leaf sheaths, but are also found on stems, leaves.
For the teliospores, they have thick-cell wall, so they are able to tolerate the cold winter. Afterward, they would undergo karyogamy and meiosis, which become basidiospores.
Question: Telium is derived from uredinium directly or not? If not, then how is the telium formed? If yes, what is the stimulation to cause the conversion?
petal , sepal , pileus , suspensor , stipe , Labellum , columella , sporangium , pistil , zygosporangium
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