Abstract
The antinematodal properties of microbially synthesized iron nanoparticles (MSFeNPs) using Pseudomonas stutzeri BB19 against root-knot nematode (RKN), Meloidogyne incognita at different concentrations (10, 20 and 50 ppm) were tested. Results proved, for the first time, the ability of P. stutzeri to synthesize FeNPs. Under lab conditions; FeNPs showed weak nematicidal effect towards second stage juveniles (J2s) and only the concentration 50 ppm was achieved 8% and 12% mortality of after four and five days of exposure, respectively. Greenhouse experiments revealed an adverse effects of FeNPs towards RKN infecting tomato plants, which drenched to soil (SD) or sparing on plants (FS) and applied either as pre or post nematode inoculation (PrI& PoI) compared to untreated plants, negative control, and nematicide Ethoprophos as a positive control. In general, PoI treatment was more effective than PrI addition in reducing nematode criteria. The best treatment was FeNPs 50 ppm which add PoI as SD. Plant growth was positively reacted with FeNPs addition; the highest increment in plant biomass was recorded by PoI at 50 ppm. Additionally, the MSFeNPs obviously improved carotenoid content, chlorophyll and enzyme activity. Based on the results, MSFeNPs can be used as an ecofriendly and inexpensive tool to combat RKN in tomato plants.
Published Version
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