Investigations on <i>Alternaria solani</i> Infections: Detection of Alternaric Acid and a Susceptibility‐Inducing Factor in the Spore‐germination Fluid of <i>A. solani</i>

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<jats:p><jats:bold>Abstract</jats:bold> The spore‐germination fluid of <jats:italic>Alternaria solani</jats:italic> was examined for factors which are important in the early stages of infection and probably explain the selectivity of <jats:italic>A. solani</jats:italic> to tomato and potato as host plants. The following activities of the spore‐germination fluid were found: 1. Host‐selective toxicity at low concentrations. 2. Infection promotion and enhancement of <jats:italic>A. solani</jats:italic> infections on host plants when spore‐germination fluid was added to the inoculum. 3. An induction of susceptibility which enabled a non‐pathogenic <jats:italic>A. alternata</jats:italic> isolate to cause necrotic spots on the leaves of the host plants of <jats:italic>A. solani</jats:italic> when its inoculum contained spore‐germination fluid of <jats:italic>A. solani.</jats:italic> Properties 1 and 2 seemed to, be attributed to alternaric acid. This phytotoxin was detectable in effective concentrations in the spore‐germination fluid. A factor, responsible for the susceptibility‐induction for <jats:italic>A. alternata</jats:italic> on the host plants of <jats:italic>A. solani</jats:italic> was characterized as a water‐soluble fraction of the spore‐germination fluid which was free of alternaric acid and not toxic.</jats:p>

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