Abstract
The potency of the some chemicals from different groups known as inducersof systemic acquired resistance (SAR) viz., acetylsalicylic acid (ASA), DL-3-aminobutyric acid (BABA), 2,6-dichloroisonicotinic acid (INA), 5-chlorosalicylic acid(CSA), nitrosalicylic acid (NSA),salicylic acid (SA),ascorbic acid (AS), and selenium(SE) in reducing reproduction Meloidogyne incognita in tomato plants cv. Castelrock was investigated under greenhouse conditions. Supplying chemicals threedays-before nematode inoculation showed maximum efficacy in reducing nematodegalls, egg-masses and eggs numbers followed by synchronized addition withinoculation, while post-inoculation treatment was less effective. Reiterative dosespost-inoculation were improved the efficacy of single dose, also three doses usedwere more effective than one or two, while, differences between two or three doseswere insignificant. On the other hand, plant fitness was slightly impaired with thirddose than second one. INA and SE showed pronounced effect in inhibitionnematode population after third dose compared with the rest chemicals, whichshowed mild increase in their efficacy from second to third doses. Unfortunately,three doses of SE were reduced plant fitness after enhanced by double doses,while INA was showed obvious phytotoxicity gradually increased by repeatingdoses. Gathering between the most effective application time (before inoculation)and the proper activated dose after inoculation was studies for emphasized theiraction and comparing with pre-inoculation only in suppressing M. incognitapopulation. Chemical activators showed enhancing in peroxidase andpolyphenoloxidase activities. In conclusion, CSA, NSA, BABA and SA were showedhighest efficacy as resistance inducers. This collectively showed reduction of totalpopulation with pre-inoculation time application and pre plus post-inoculationapplication, 57.6&83.8%, 56.5&81.6%, 55.4&79.2% and 54.5&78.1%, respectively.Also the fecundity of nematode was taking similar trend as total population. Theresults suggest that tested chemicals especially CSA, NSA, BABA and SA havepotential to suppress root-knot nematode infection in tomato plants through inducedsystemic resistance.
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