Axenic culture of Cronartium fusiforme from three spore forms

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Abstract
Axenic cultures of the fusiform rust fungus (Cronartium fusiforme) were initiated from basidiospores, aeciospores, and uredospores. The morphology, cytology, and nuclear condition of the mycelium from the three spore stages are described and illustrated. Cultures derived from aeciospores and uredospores of C. fusiforme are reported for the first time. An improved culture medium is described. Inoculation of slash pine (Pinus elliottii var. elliottii) seedlings with suspensions of mycelium from basidiospores induced some typical galls which produced pycnial exudates and aeciospores. On synthetic medium, cultures from basidiospores were monokaryotic. Mostly dikaryotic mycelium was produced from aeciospores and uredospores, but some monokaryotic hyphae were observed.

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