Properties of a Volatile Fraction from Uredospores of Puccinia graminis var. tritici Affecting Their Germinaton and Development. II. Some Physical and Chemical Properties.

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Abstract
Extracts which accelerate markedly the germination of rust uredospores were prepared from resting spores. The active material is relatively volatile and is soluble in water and various organic solvents. Although it has not yet been isolated or identified, evidence from inactivation tests with various chemical reagents suggests that there may be two active substances, one possessing a carbonyl group and the other a hydroxyl group. The stimulator promotes germination by overcoming the self-inhibition due to an endogenous germination inhibitor. Under suitable environmental conditions crude preparations of the germination stimulator also induce differentiation of the germ tubes into structures resembling appres-soria, infection hyphae, infection pegs, and substomatal vesicles.