The invasion channels of damage fungi in bamboo lumber
Xingxia Ma, Mingliang Jiang, Daochun Qin
The micro-agents on bamboo lumber damage are mould, stain, and decay fungi. This research is about invasion channels of bamboo lumber damage fungi by scanning electron microscope (SEM). The results showed that the conidia of mould were only accumulated on the surface of bamboo and no hyphae detected in bamboo vascular bundle, and hyphae of stain penetrated into bamboo and grew in metaxylem vessel, then expanded from cell to cell through the pits. The brown-rot hyphae extended in cell to cell of bamboo via pits of cell wall, like stain fungi. But branches of brown-rot hyphae were gradually increased and thicker. Hyphae formed nicks (bore holes) on lumen wall contact and then rapidly penetrated. The bore holes later enlarged uniformly. Vertical section showed that bamboo decay firstly on metaxylem vessel wall, then parenchyma cells, finally fibre.