Interaction of Meloidogyne incognita and Coal-Smoke Pollutants on Tomato


  • Mujeebur Rahman Khan
  • M. Wajid Khan


Leaf Stomata, Nematode Reproduction, Plant Growth, Root-Knot Disease, Thermal Power Station, Tomato


Seedlings of tomato cv. Pusa Ruba were placed in clay pots at 3 sites, 1 (K1) and 2 (K2) km from a coal-fired thermal power station and at a control site at the Department of Botany, Aligarh Muslim University, Aligarh, India in 1988 and 1989. Twenty pots were placed at each site and 10 were inoculated each with 2000 juveniles of Meloidogyne incognita race 1. Mean concentrations of SO , NO , and suspended particulate matter were very low at the control site but at K1 were 145, 89 and 563 g/m in 1988 and 135, 83 and 553 g/m in 1989, respectively. The corresponding concentrations at K2 were 193, 107 and 329 g/m in 1988 and 181, 98 and 363 g/m in 1989, respectively. Chlorosis and browning developed on the leaves of tomatoes grown at the polluted sites, particularly at K2. Foliar injury was invariably greater on nematode-infected plants. The coal-smoke pollutants (except at K1 in 1989) and the nematodes singly caused suppressions in shoot and root growth, leaf pigments and yield. The