Biochemical and physiochemical changes in susceptible and resistant bitter gourd cultivars/varieties as influenced by root knot nematode, Meloidogyne incognita
Manaswini Mahapatra and Dhirendra Kumar Nayak
Seventeen gourd seeds were collected and examined under greenhouse conditions to determine the susceptibility and biochemical nematode galling reactions (RKN), Meloidogyne incognita. Of the seventeen tested genotypes, only one variety was resistant, four varieties were moderately resistant, five varieties were susceptible, and seven varieties were classified as susceptible / resistant to nematode infections based on the number of root galls and galls. Only one variety showed a resistant reaction with an average of 7-67 galls per plant, while others were moderately resistant to very susceptible. The maximum reduction of chlorophyll 'a', 'b' and all was observed in local Nakhara (6.97%) and lowest in SundargarhLocal-1 (0.371%) on their control. The same trend was observed in the two varieties in the content of chlorophyll "b" with a maximum of 3.281% and the lowest as 1.631% and a total content of chlorophyll with a maximum of 1.278% and the lowest with a 0.236% respectively. The total content of phenolic and Proline compounds (average shoot and root) increased significantly in most of the infected plants compared to uninfected plants and maximum was observed in the roots with 42.48% compared to the control in the Sundargarh local-1 variety and the lowest was 5.15% Rajsunakhala local-1. The same tendency was achieved in the infected outbreaks of both varieties. A similar trend was also observed in the roots and shoots, both the variety of Proline content as 25.00% and 2.44% in the roots and 47.06% of 8.077% and the leaves respectively.