Caoutchorc in teak wood(Tectona grandis L.f): formation, location, influence on sunlight irradiation, hydrophobicity and decay resistance

摘要

The formation of caoutchouc in teak sapwood and heart- wood was examined in an increment borer core using light microscopy after staining with osmium tetroxide. The distribution of the polyisoprenoid in untreated and ex- tracted heartwood, its influence on surface chemistry, contact angle with water and formation of radicals before and after irradiation with sunlight, and also on decay re- sistance were determined. Caoutchouc was not observed in the cambial zone and outer sapwood, but occurred from the middle of sapwood as black globule. In sapwood, if available, it was mainly found in the lumen of parenchy- ma. In heartwood the globule were also detected in fibers and vessel elements.