Response of soybean cultivars to infection by Meloidogyne incognita and Rhizobium japonicum alone and in combination


  • I. Y. Trabulsi
  • M. A. Ali
  • M. E. Abd-Elsamea


Several plant parasitic nematodes have been reported in association with soybean, Glycine max L. (Rebois and Golden, 1978). Root-knot nematodes, Meloidogyne spp., are regarded as a major pest wherever the crop is grown. Nitrogen-fixing bacteria are important in relation to the growth and yield of soybean (Longeri and Herrera, 1972; Saxena and Tilak, 1975). Bacterial root nodulation can be suppressed by the invasion of plant parasitic nematodes. Studies involving Meloidogyne and H eterodera spp. have shown that their invasion of the roots of leguminous hosts can completely prevent nodulation with subsequent reduction in plant growth (Robinson, 1960; Malek and Jenkins, 1964; Taha and Raski, 1969; Barker and Huisingh, 1970; Wescott and Barker, 1976). The response of three soybean cultivars to the root-knot nematode, Meloidogyne incognita (Kofoid et White) Chitwood and the influence of nematode invasion on nodulation by Rhizobium japonicum were investigated in the experiments described here.