Lignification of Lesion Borders inRhizoctonia-Infected Bean Hypocotyls

Publisher Website
Google Scholar
Abstract
Lesions formed on bean (Phaseolus vulgaris L., ''Red Kidney'') hypocotyls infected with Rhizoctonia solani are surrounded by autofluorescent cell walls resistant to maceration by cell wall-degrading enzymes. These lesion border cell walls stained positively for lignin and phenols. Lesion border walls were macerated by a mixture of cellulase and macerase after delignification, but not after extraction of calcium or fats and waxes. Peroxidase and polyphenoloxidase were active in young lesions in advance of fungal hyphae. Results suggest that lignification of cell walls may be an important factor in limiting lesion expansion in stem canker of beans.