Abstract
A lignin-like substance (LS) has been found in roots of Japanese radish infected by Peronospora parasitica. From infrared and ultraviolet absorption spectra, methoxyl content, and paper chromatograms of the degradation products, it was confirmed that LS from infected roots is different from wood lignin. This substance was not found in healthy parenchyma. Living tissues alone were capable of forming this substance. Histochemical reactions by phloroglucinol-HCl and Loele's reagents revealed that high peroxidase activity was located around the lignified cell walls. All cells in the sections were alive judging from plasmolysis except those on the cut surface. However, we could not determine exactly whether the lignification of cell walls had taken place before or after the fungal attack. Lignification in cell walls of parenchyma was incomplete even when the cells were infected.
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