Peroxidase Activity During Susceptible and Resistant Interactions Between Cassava (Manihot esculenta) and Xanthomonas axonopodis pv. manihotis and Xanthomonas cassavae

Phenolic compounds have been implicated in the resist! ance of cassava "Manihot esculenta# to xanthomonads[ Cassava cultivars MCOL 11 and CM 412 6 were inocu! lated with Xanthomonas axonopodis pv[ manihotis and Xanthomonas cassavae[ CM412 6 was susceptible to both pathogens\ whereas MCOL 11 was susceptible to X[ a[ pv[ manihotis and resistant to X[ cassavae[ In the resistant interaction\ no disease symptoms were observed in the leaf\ bacterial growth was greatly reduced\ and there was a twofold increase in cell wall!bound peroxidase activitywhich may be related to lignin deposition