Leaf extract of Rhizophora apiculata as a potential bio-inducer of early blight disease resistance in tomato plant
Mahalakshmi, G.; Vengadeshkumar, L.; Rajamohan, K.; Sanjaygandhi, S.; Sharmila, A.M.
Journal Title:Novel Research in Microbiology Journal
Tomato (Lycopersicon esculentum Mill.) is one of the most remunerative and widely grown vegetables in the
world. Tomato has ranks second next to potato in world acreage, but it has rank first among processing crops. In
the present study, tomato plants treated with Rhizophora apiculata as seed treatment at 15% and as foliar spray at
30 and 45 days after treatment (DAT), co-inoculated with the Alternaria solani pathogen, recorded maximum
activity of the defense related enzymes and PR proteins including; peroxidase (PO), polyphenol oxidase (PPO),
phenylalanine ammonia lyase (PAL), catalse, chitinase and β- 1,3 glucanses. Induction of these defense enzymes
was studied in vivo in treated tomato plants grown in the greenhouse. Moreover, the healthy control tomato plants
also showed slight increase in activities of all these defense enzymes up to four days, and thereafter showed
gradual decline. The aim of the present investigation was to access the induction of the defense enzymes and PRproteins
in tomato plants infested with A. solani, through the application of R. apiculata extract. Accordingly, we
can reduce the incidence of early blight disease in these tomato plants. Current findings recorded the earlier and
higher accumulation of the defense enzymes and PR-proteins mainly; PO, PPO, PAL, β- 1, 3 glucanse and
chitinase in tomato plants, resulting in significant reduction in early blight infection.