Microscopic and Histochemical Changes in Douglas-Fir Bark Accompanying Fungal Invasion
Keywords:<i>Pseudotsuga menziesii</i>, lignin, condensed tannin, <i>Bispora betulina</i>, decay
AbstractDouglas-fir bark in the process of biological deterioration contained two types of tissue "bleaching." Sclereid walls were "bleached" as wall lignin was removed in tissues infested with Bispora betulina, and parenchyma and sclereids were "bleached" as a result of the selective removal of condensed tannins from wall surfaces and lumina in tissues consistently infeted with an unidentified fungus resembling Isaria. Bleached tissue symptoms were not produced in bark tissues inoculated with B. Betulina or the fungus resembling Isaria, but both fungi significantly altered specific bark components.
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