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Increases in peroxidase and poly phenol oxidase activities and production of anti fungal substances in mulberry shoots following wounding or infection by pathogenic fungi



Increases in peroxidase and poly phenol oxidase activities and production of anti fungal substances in mulberry shoots following wounding or infection by pathogenic fungi



Annals of the Phytopathological Society of Japan 44(2): 127-136



Peroxidase activity in cut surface tissue in the bark of mulberry shoots increased within 1 min after cutting, accompanied by a decrease in activity in tissues next to the cut surface. This sudden change in peroxidase activity was due to peroxidase contained in latex which flowed out from laticifers in the tissue next to the cut surface. Later increase in peroxidase activity in the tissue neighboring wound, however, was due to de novo synthesis of protein since blasticidin S (Bc S), an inhibitor of protein synthesis, inhibited the increase. Browning of the bark segments cut from the shoots was also inhibited by Bc S treatment. The pattern of increase in peroxidase activity in the tissue neighboring wound of shoots was altered when they were infected with Stigmina mori and Diaporthe nomurai. The highest peaks of peroxidase and polyphenoloxidase activities were then formed in the border part of the disease lesion. Four bands, A-1, A-2, A-3 and A-4, were found by the gel isoelectric focusing on peroxidase activities of extracts obtained from mulberry shoots infected by Fusarium solani and D. nomurai. With latex secreted from wound, the bands, A-2, A-3 and A-4, were formed. In the case of the healthy tissue 2 bands, A-2 and A-3, were distinct. Phytoalexin-like substances were found in the bark tissue infected by S. mori, D. nomurai and F. solani.

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Accession: 005666022

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