THE MECHANISM OF ACTION OF THE YAM NEMATODE, SCUTELLONEMA BRADYS BY S. O. ADESIYAN Phytopathology Unit, Department of Agricultural Biology, University of Ibadan, Ibadan, Nigeria Chromatographic analysis of the incubation solution of S. bradys showed that five amino acids--- aspartic acid, phenylalanine, hydroxyinol acetic acid, leucine and isoleucine were discharged by this nematode. Pectinase and amylase activities were detected in homogenates of S. bradys. The absence of the steroid group of compounds in the nematode-infected yam tubers revealed by spectro- metric analysis might be disease-related as evidenced by its appearance in the healthy yam tubers. The dry rot disease of yam tubers (Dioscorea sp.) is closely associated with the yam nematode Scutello?aem? bradys, which predisposes yam tubers to infection by secondary organisms like fungi and bacteria that cause wet rot (Adesiyan et al. 1975; Bridge, 1973). To date, very little is reported about the role of S. bradys in the dry rot disease of yam tubers. Experiments were therefore designed to study the substances discharged by S. brad ys that might cause dry rot in yam tubers. The amino acids discharged by S. brad ys were investigated by methods described by Myers & Krusberg ( 1965 ) .
Nematologica – Brill
Published: Jan 1, 1976
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