Abstract
The root rot disease caused by Pythium myriotylum is responsible for about 70% of cocoyam production loss in Cameroon. The potential of benzo-(1,2,3)-thiadiazole-7-carbothioic S-methyl ester (BTH) to trigger resistance in cocoyam (Xanthosoma sagittifolium) plants against P. myriotylum was investigated. Under controlled conditions, BTH was an efficient elicitor of some defense reactions in cocoyam. Application of 0.2 mg ml−1 of BTH on leaves 7 days before inoculation of roots with P. myriotylum enhanced the activities of peroxidase (Pox) and polyphenoloxidase (PPO) as well as the total phenolic content. This resistance was noted as a decrease in disease incidence and severity in BTH-treated plants. This increase in Pox activities was correlated with two new isoforms in a white (sensitive) cultivar inoculated after stimulation. In a yellow (resistant) cultivar, stimulation was characterized by the appearance of one isoform. Qualitative analysis of phenolic compounds by HPLC showed an increase of hydroxycinnamic and flavonoid derivatives after inoculation. We also observed the appearance of a new caffeoylshikimic acid derivative after stimulation followed by inoculation of both cultivars. The findings indicated that the pattern of induction is different and depends on the variety.
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