Abstract
The stem of Ailanthus excelsa Roxb. (Simaroubaceae) may develop vascular occlusions and gum-resin cavities in the xylem as a response to injury and infection. Fungal hyphae are observed in the vessel lumen and in the adjacent parenchyma cells. The occlusions appeared in various forms and showed varying chemical composition. The chemical nature of the occluding material differed from that of the exudate formed in the cavities. The majority of occlusions contained lipids, protein, polysaccharides, phenolics, lignin and probably pectin, whereas, the exudate contained lipids, protein and four soluble sugars. All the components of the occlusion except lignin and pectin appear to have been formed in the parenchyma cells adjacent to the vessel and migrated to vessel lumen through the vessel wall pits. The different constituents migrate into the vessel lumen independently where they mix to form occlusions.
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