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The control of root-knot nematodes (Meloidogyne spp.) by Pseudomonas oryzihabitans and its immunological detection on tomato roots

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For more content, see Nematologica.

Pseudomonas oryzihabitans, a bacterium associated with the entomopathogenic nematode Steinernema abbasi, was evaluated for its potential to colonise roots and thereby control a field population of root-knot nematodes. Immunological techniques were developed to detect root colonisation of P. oryzihabitans on tomato roots using a specific polyclonal antibody raised against vegetative bacterial cells. In vitro, bacterial cell filtrates were also shown significantly to inhibit juveniles hatching. In a glasshouse pot experiment, there were 22 and 82% fewer females in roots of plants treated with suspensions containing 103 and 106 cells ml−1 of P. oryzihabitans, respectively. In addition, there were significantly fewer egg masses produced; however, the numbers of eggs per egg mass did not differ significantly. The relationship between root colonisation and nematode control is discussed.

Affiliations: 1: Department of Plant Production, Technological Education Institution of Larissa, 41110 Larissa, Greece; 2: School of Agriculture, Policy and Development, The University of Reading, Earley Gate, P.O. Box 237, Reading RG6 6AR, UK; 3: Nematode Interactions Unit, Plant Pathogen Interactions Division, Rothamsted Research, Harpenden AL5 2JQ, UK


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