Effect of Temperature and Host:Parasite Combination on the Latent Period ofPuccinia reconditain Seedling Wheat Plants

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Abstract
Increasing the ambient temperature from minimum (10.degree. C) to optimum (26.5.degree. C) decreased the latent period, while raising the temperature from optimum to maximum (32.2.degree. C) increased the latent period. Temperature developmental curves for latent period were skewed to the left, with an optimum at 80% of the temperature range (10.0-32.2.degree. C). Significant differences were measured in the effects of temperature, host:parasite combination, and their interactions on latent period. Presence of a gene or genes for resistance in the host line generally was associated with significant differences in the host line effects and host line interaction with temperature and parasite culture. Latent period means for the various culture:temperature combinations show that significant differences occur at temperatures near the minimum for fungal development, but no significant differences in latent period occur near optimum temperatures.

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