Abstract
In the young stem of Pterocarpus marsupium and Azadirachta indica gum cavaties are associated with the gum formation. The gum in a cavity is formed as a result of breakdown of cells lining the cavity. During their degradation, a number of histological and histochemical changes are obseryed in these cells before they contribute to the gum formation. In Pterocarpus marsupium the cells lining the cavity appear radially elongated and show increased stainability, deposition of tannin granules and presence of fungal hyphae. In Azadirachta indica these cells show dense stainability, deposition of tannin granules and lignification of their walls which swell to great extent before degradation. Bacteria have also been located in the cavity in Azadirachta indica . The probable roles of fungal and bacterial pathogens in relation to cell degradation have been discussed.
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