Effect of probenazole on the activities of enzymes related to the resistant reaction in rice plant.

Abstract

The activities of enzymes including peroxidase, polyphenoloxidase, phenylalanine ammonia lyase, tyrosine ammonia-lyase or catechol-O-methyltransferase in rice leaves were surveyed to elucidate the mechanism of action of probenazole in connection with the resistant reac tion of host plant against rice blast fungus. The activities of enzymes were increased evidently in the treated-inoculated rice leaves with probenazole and rice blast fungus conidia than in the leaves of treated-noninoculated, nontreated-inoculated or nontreated-noninoculated one. The above results seem to be closely correlated with the facilitated formation of a physical barrier in and around the invaded cell, which was observed microscopically.

Efficacy of probenazole for control of southern corn leaf blight

“…In addition, a low dose of Oryzemate (1.8 kg a.i./ha) was applied to control SCLB and did not contact the pathogen directly by a soil-surface application. In accordance with previous studies, 10,11,13,14,18,19,20,26) it is suggested that the effect of Oryzemate to control SCLB could be attributed to the activation of systemic resistance in maize.…”

“…26,27) The persistent activity of Oryzemate was attributed to the host-mediated defense action. [11][12][13][14][15][16][17][18] Despite extensive use of Oryzemate over many years, development of resistance in the target fungus has not been observed 26) ; thus, using Oryzemate to control SCLB may reduce the outbreak of C. heterostrophus due to the development of resistant strains.…”

A benzothiadiazole derivative induces systemic acquired resistance in tobacco

“…Presently, two compounds, SA and INA, have been clearly demonstrated to induce SAR. Other compounds have been shown to induce either PR-1 gene expression or resistance against one or two pathogens, but they have not been shown to induce all of the characteristics of SAR (Asselin et al, 1985;Cohen, 1994;Iwata et al, 1980). While both SA and INA are potent inducers, both have problems with crop tolerance (e.g.…”

Effects of Chlobenthiazone on the Infection Process by <i>Pyricularia oryzae</i>

“…inhibit appearance of infection pegs from appressoria without the suppression of other processes. The second includes the compounds, WL-28325117) and probenazole, [18][19][20][21] which are reported to induce resistance in the host plant by either eliciting fungitoxic components such as momilactons A and B, a-linolenic acid, 13-hydroxy-cis-9, trans-11, cis -l 5-octadecatrienoic acid, or accentuating several enzyme activities such as peroxidase, phenylalanine ammonia lyase and catechol-o-methyltransferase, contributing to the formation of lignoid barriers around the infection site. Although the blast fungus has the ability to penetrate into host tissues in the presence of the second group of compounds, subsequent spreading of the developing hyphae to adjacent epidermal cells is halted.…”