Changes in the Peroxidase and Catalase Enzyme Activity of Papaya Leaves infected with Papaya leaf reduction virus

Histological and histochemical changes induced by the amendment of chitosan and inoculation of Pseudomonas sp. against Tomato leaf curl virus (ToLCV) in tomato (Lycopersicon esculentum Mill.)

“…The reduction in size of leaf tissues and their destruction may be due to metabolic changes in tissues causing hypotrophy in palisade and spongy parenchyma cells. Similar observations were recorded in infected papaya leaves (Singh, 1971), Cucumber mosaic virus (CMV) affected chilli leaves (Mishra and Singh, 1973), CMV infected tobacco leaves (Ehara and Mishawa, 1975), TMV infected tomato (Alok et al, 1986) and in pigeonpea infected by sterlity mosaic virus (Singh and Rathi, 1996a).…”

“…There was reduction in the amount of reducing sugars, non-reducing sugars, total sugars, starch and total chlorophyll in the plants infected with yellow mosaic virus as compared to healthy plants (Thind et al, 1996). In case of papaya leaves infected with the Papaya ring spot virus (PRSV), the palisade layers and spongy cells became smaller, and the leaves have been shown with broad inter cellular spaces (Singh, 1971).…”