Cell Necrosis and Fungus Content in Fusiform Rust-Infected Loblolly, Longleaf, and Slash Pine Seedlings

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Abstract
Galled seedlings of loblolly [Pinus taeda], longleaf [P. palustris] and slash pine [P. elliottii var. elliottii] contained necrotic areas that were positive for tannin. These areas contained rust hyphae that exhibited peroxidase activity. Cell necrosis and deposition of tannin in infected tissues of slash pine appeared to be a normal host reaction to the pathogen [Cronartium quercuum f. sp. fusiforme]. Tannin accumulation does not seem to be responsible for fusiform rust resistance since it normally occurs in actively growing galls.

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