Abstract
This study was conducted to evaluate the comparison between the histological and histochemical changes in leaves of tomato due to tomato leaf curl virus (ToLCV) with or without plant growth-promoting rhizobacteria (PGPR) and chitosan treatments. The combined treatment of chitosan and Pseudomonas sp. induced a significant (P=0.05) increase in the activities of polyphenoloxidase (PPO), peroxidase (POD), chitinase, phenylammonialyase (PAL) and enhanced the content of phenolic compounds in tomato leaves. Furthermore, the combined application reduced the disease severity (%) of ToLCV in tomato plants. Although, the histopathological and histochemical studies revealed more destruction in the diseased plants, these changes could be reduced to the level of the healthy plants due to combined treatment of chitosan and Pseudomonas sp. Key words: Pseudomonas sp., Tomato leaf curl virus (ToLCV), induced systemic resistance, chitosan, biocontrol, Bemisia tabaci, histopathology.
Highlights
Histological and a his stoche emical chang ges ind duced by the e amend a ment of o chitosan a and ino oculation of
Histopathological studies were conducted to study the changes occurring due to ToLCV infection as well as to study to what extent these changes are reduced by inoculation with biocontrol agents
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), Tobacco mosaic virus (TMV)
Summary
Histological and a his stoche emical chang ges ind duced by the e amend a ment of o chitosan a and ino oculation of. This study was condu ucted to eva aluate the co omparison b between the e histologica al and histo ochemical changes in n leaves of tomato due e to tomato leaf curl viirus The comb bined treatm ment of chito osan and Pseudomon nas sp. The e combined application reduced the disease sev verity (%). The histtopathologic cal and histo ochemical sttudies revea aled more destruction n in the diseased plants,, these chan nges could b be reduced tto the level of the health hy plants due to combined treatm ment of chitos san and Pse eudomonas s sp
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