Vol. 11, Special Issue 8 (2022)

Author(s):
Manaswini Mahapatra and Dhirendra Kumar Nayak

Abstract:
Seventeen bitter gourd varieties were collected and screened under greenhouse condition for both susceptibility and biochemical reactions to root-knot nematode (RKN) Meloidogyne incognita. Only one variety was resistant with 7-10 number of galls per plant while others were moderately resistant to highly susceptible with > 10 numbers of galls per plant. In order to understand the basis of nematode resistance six varieties namely Sundargarh local-1, Amatalla Beejghar Karala long green, Ankur hybrid (Moderately resistant) and Nakhara local, Indojapane hybrid, Rajsunakhala local-1 (Highly susceptible) were sown in earthen pots in the greenhouse maintaining four replications in Completely Randomized Design. This experiment was terminated at 45 days after sowing of seeds or 30 days after inoculation of nematodes. The Nitrogen content (%) in shoot was significantly lower by 11.628 to 81.819 in the resistant varieties as compared to that of susceptible varieties but increased by 5.54 per cent in root system of resistant variety in contrast to susceptible one (37.107%). The infected plants had decreased per cent of phosphorus content in shoots and increased per cent of roots in highly susceptible and moderately resistant varieties. Significant increase of potassium content of both susceptible and resistant infected plants which increase was more pronounced in both shoots and roots of resistant varieties as compared to the susceptible varieties.