Abstract
Screening of 50 rice varieties along with LALAT as local check, which showed evidence of damaging potential of Meloidogyne graminicola in terms of plant growth parameters and disease incidence. Disease intensity grade was classified on the basis of root knot index. Out of fifty varieties, 45 were moderately resistant to Meloidogyne graminicola while three varieties Ciherang Sub 1, IR 64 Sub 1and PSBRC 18 were susceptible with maximum number of egg mass per galls (6) while the rest 2 varieties, IRIOF 571 and IRIOF 602 showed resistant reactions. Observations were recorded in the biochemical modifications relating to various parameters like total chlorophyll, total sugar and starch contents, protein, phenol, nutrients (N, P, K, Ca, Mg, Fe) and proline content during post infection periods. The variation in total chlorophyll, total protein, proline and total sugar content in five cultivars i.e. IRIOF 571 and IRIOF 602 (Resistant), Ciherang Sub 1, IR 64 Sub 1and PSBRC 18 (susceptible) were studied 45 days after inoculation. Reduced percentage of total chlorophyll contents were observed in inoculated samples than the healthy counterparts. However, an increase in amount of total protein, phenol, proline and total sugar contents was observed in the diseased tissues.
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