Histopathological changes in microbially infected forest tree seeds
2007
Dayan, M.dP., Department of Environment and Natural Resources, Cordillera Administrative Region (Philippines). Ecosystems Research and Development Service
Histopathological study of microbially infected forest tree seeds was conducted to determine the effect of different fungi on the cellular structures of artificially and naturally infected seeds. The mode of infection of Colletotrichum gloeosporioides, Fusarium moniliforme, and Phoma sp. on artificially inoculated seeds of Pterocarpus indicus Willd (Narra), Lasiodiplodia theobromae (Ldt), F. moniliforme, and F.solani on Swietenia macrophylla King (mahogany); and F.solani on Samanea saman (Jacq.) Merr. (raintree) was decribed. Ramification of the hyphal structures from the seed coat to the subepidermal layer and some parts of the cotyledon of narra and endosperm of mahogany was observed. Hyphal growth of F.solani was concentrated mainly on seed coat and less penetration was observed beyond the epidermal layer of raintree seeds. Cellular structures of naturally infected seeds of Anisoptera thurifera Blume (dagang), Parashorea malaanonan (Blanco) Merr. (bagtikan), Gliricidia sepium (Jacq.) Steud. (kakawate), and Instia bijuga (Coleobr) O.Ktze (ipil), particularly embryos, were greatly damaged by various fungi. Intercellular and intracellular penetration of hyphal structures caused destruction on the cellular membrane in and outside the embryo leading to non-germinability of the seeds.
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