author(s)
Devaraja KP, Pankaj and Anil Sirohi

abstract
The present study was carried out in Net house of the Division of Nematology, ICAR-Indian Agricultural Research Institute (ICAR-IARI) during the month of June-August, 2017. The seeds of different 15 DSR cvs./landraces were pre-soaked in petri dish overnight and then sown in 2.5 inch’s plastic pots, to determine the changes in growth responses of rice (Oryza sativa L.) and the varietal reaction upon root-knot nematode (M. graminicola) infection. Out of the total 15 rice cvs., six (BL-13, CO1A51, Hazari Dhan, SGW 70, Khandagari, GB-2, FP-9) had less than 10 galls/plant and of these, BL-13 exhibited a strong resistance response with least number of galls (1 galls/plant). With increase in infection of M. graminicola at 7 and 21 DAI in resistant (BL-13) and susceptible (PB1121) DSR cultivars, there was a progressive reduction growth parameters viz., fresh root weight(4.21, 0.43), root length(15.5, 6) and shoot length (28.4, 10.8) of plant and also fecundity of the nematode were suppressed in the resistant cultivars as compare to susceptible.