Interaction ofPhytophthora cinnamomiand a Resistant Host,Acacia pulchella

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Abstract
On the lateritic soils of Western Australia, the jarrah forest may be managed to encourage an understory of A. pulchella as a means of reducing the inoculum potential of P. cinnamomi. The cytology and ultrastructure of the interaction between P. cinnamomi and the legume A. pulchella were studied to determine whether the acacia is inherently resistant to attack by this root-infecting fungus. Penetration and attempted establishment of P. cinnamomi in the acacia roots suggested that the interaction was incompatible, because the host cells apparently responded hypersensitively to infection. Darkly staining material, which was autofluorescent and presumably phenolic, accumulated in the necrotic cells, and wall appositions formed close to invading hyphae. This study reports the 1st resistant host reaction to infection with P. cinnamomi.