Contribution of Active Defense Responses in the Limitation of Fungal Spread in the Sapwood of Living Sugi (Cryptomeria japonica) Tree

概要

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The participation of active defense responses in the limitation of fungal spread in the sapwood of living sugi tree was determined. Isolates of Guignardia cryptomeriae were inoculated to living trees, fresh logs, frozen and thawed logs and autoclaved logs, and the spread of wood discoloration and fungal hyphae was assessed. In autoclaved logs and freeze-treated logs, wood discoloration and reaction zone formation were not observed, and fungal hyphae of both of virulent and avirulent isolates grew rapidly in the wood. In fresh logs, wood discoloration and the formation of a pale reaction zone and transition zone were observed_ Virulent isolates spread rapidly, but the spread of avirulent isolates was inhibited. In living trees, wood discoloration was observed and reaction zones were formed at lesion margins. These results indicated that constitutive defense mechanisms had no effect on the spread of both of virulent and avirulent isolates, and that active defense responses were important in the limitation of spread of fungal hyphae, hence in the limitation of wood discoloration. Further, it appeared that avirulent, but not virulent, races of G. cryptomeriae were easily inhibited even by weak host responses.
一般社団法人日本森林学会の論文
1998-05-16