ATPase, peroxidase and lipoxygenase activity during post-harvest deterioration of cassava (Manihot esculenta Crantz) root tubers

Alterations in the activity of ATPases, peroxidases and lipoxygenases were studied during early stages of post-harvest deterioration of cassava (Manihot esculenta Crantz cv. Oyolu) root tubers. The peak activities of Ca²⁺-ATPase, (Ca²⁺+Mg²⁺)-ATPase, Na⁺+K⁺-ATPase, Mg²⁺-ATPase and peroxidases were observed after the first 24 h and thereafter decreased. The activity of lipoxygenase was biphasic, probably depicting two distinct isoforms expressed during deterioration. The results indicate that ATPases and peroxidases have a role in the post-harvest deterioration of cassava tuber, but the participation of lipoxygenases seems unlikely.