Properties of a Volatile Fraction from Uredospores of Puccinia graminis var. tritici Affecting Their Germination and Development. I. Biological Activity.

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Abstract
A volatile fraction stimu-lating uredospore germination and inducing formation of infection structures was obtained by distillation from the substances released into water by uredospores. This material counteracted the self-inhibition and the inhibitory effect of the original spore extract on germination, and caused the differentiation of appressoria, sub-stomatal vesicles, and infection hypae from spores floating on water or dilute phosphate buffers. Up to 80% of the spores produced infection structures when the volatile material was administered directly or by diffusion through the gas phase in Conway vessels, under conditions which allowed only germ tube growth in its absence.