DEVELOPMENT OF MICROORGANISMS IN THE OAK HEARTWOOD (QUERCUS-PETRAEA LIEBL) DURING AIR-DRYING IN OPEN-AIR CONDITIONS

Development of microorganisms in the oak heartwood (Quercus petraea Li ebl) during air drying in open air conditions. Different samples of oa k heartwood Quercus petraea Liebl species were observed by scanning el ectron microscopy and transmission electron microscopy. We studied fou r durations of air drying (6, 12, 18 and 24 months) and different dept hs (0, 3, 5 and 10 mm). The photographs show a large colonisation of t he wood surface by different spores during the first 6 months, but onl y a few of them are able to sprout and produce a mycelium. The myceliu m is able to penetrate inside the wood by a fissure. After 12 months w e note the presence of mycelium, in very limited numbers, in the sprin g vessels. From this point, the fungi are able to penetrate into the h eartwood cell wall.