Antagonistic Interaction BetweenMeloidogyne incognitaandRhizobium leguminosarumon Cowpea

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Abstract
Greenhouse experiments and histologic investigations were done to determine interactions between cowpea root-knot nematodes (M. incognita) and root-nodule bacteria (R. leguminosarum). Cowpea plants inoculated with both rhizobia and nematodes showed more severe N deficiency and retarded growth than plants inoculated with nematodes only or uninoculated plants. Nematode invasion reduced the numbers of nodules and inhibited N fixation by about 63% in nodular tissue. Infected nodules contained the different developmental stages of the nematode. Histologic studies indicated that nematodes developed in nodular tissue and they were found inside vascular bundles. Many giant cells with thickened walls were produced and exhibited the morphologic characteristics of transfer cells. The nematodes did not alter the structure of nodules but bacteroides did not develop adjacent to nematodes. Infected nodules deteriorated earlier than uninfected ones.

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