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dc.contributor.authorRajab, Reeja-
dc.contributor.authorRajan, S Sajitha-
dc.contributor.authorSatheesh, L Shilpa-
dc.contributor.authorHarish, S R-
dc.contributor.authorSunukumar, S S-
dc.contributor.authorSandeep, B S-
dc.contributor.authorMohan, T C Kishor-
dc.contributor.authorMurugan, K-
dc.identifier.issn0975-1009 (Online); 0019-5189 (Print)-
dc.description.abstractAim of this study was to investigate the intensity and timing of the ROS formation, lipid peroxidation and expression of antioxidant enzymes as initial responses of calli of Sesamum prostratum (SP) against Fusarium oxysporum f. sesame crude toxin metabolite of varying concentrations. 2,4 dichlorophenoxy acetic acid (2,4-D) / coconut milk combinations were found to be more efficient among different hormonal regimes (2,4 -D, 2,4-D/casein hydrosylate and 2,4-D/ coconut milk). The concentration of hydrogen peroxide and lipid peroxidation were higher (13.2 and 5.7-folds, respectively) after 6 h in the treated callus confirmed the oxidative stress. An increase in total phenolics was also detected in inoculated callus. Increased activity of antioxidative enzymes viz., NADPH oxidase and superoxide dismutase (SOD) corroborate with the high level of ROSs, such as O2.- and H2O2. The poor activity of catalase confirmed the oxidative burst in the callus leading to necrosis. Activity of peroxidase was at par with total phenolics. Similarly, phenylalanine ammonia lyase (PAL) also showed high activity revealing the active phase in the synthesis of secondary metabolites in the plant. The oxidative burst generated in the interaction between Sesamum and F. oxysporum f. sesame toxin might be the first line of defense by the host mounted against the invading necrotrophic pathogen. The results suggested that the rapid production of reactive oxygen species in the callus in response to fungal toxin had been proposed to orchestrate the establishment of different defensive barriers against the pathogens.en_US
dc.sourceIJEB Vol.47(10) [October 2009]en_US
dc.subjectAntioxidant enzymesen_US
dc.subjectFusarium oxysporum f. sesameen_US
dc.subjectHypersensitive responseen_US
dc.subjectOxidative bursten_US
dc.subjectReactive oxygen speciesen_US
dc.subjectSesamum prostratumen_US
dc.titleHypersensitive response of Sesamum prostratum Retz. elicitated by Fusarium oxysporum f. sesame (Schelt) Jacz Butler.en_US
Appears in Collections:IJEB Vol.47(10) [October 2009]

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