Vol. 10, Issue 12 (2021)

Author(s):
B Raghavender, P Rajanikanth, NRG Varma, Vanisree S, Vidyasagar B and D Neethu Roy

Abstract:
Seven genotypes along with two resistant checks (PTB33 and BM71) and one susceptible check (TN 1) were evaluated under greenhouse conditions for tolerance studies against brown planthopper (BPH, Nilaparvata lugens Stål). Perusal of the results showed significant differences in days to wilting that ranged from 12.21 to 33.21 days across the rice genotypes tested. The susceptible check TN1 succumbed to BPH feeding within 12.21 days and was found to show significantly lowest tolerance level compared to any other test entry. The resistant checks PTB33 and BM71 tolerated to BPH for 33 and 32 days respectively. Among the test entries RNR-28370 recorded significantly highest tolerance level with 30.33 days taken for wilting. The test entry Magic-289 that took 29.45 days for wilting was on par with genotype RNR-28370. The other test genotypes viz., IRUE 45, IRUE 52, and Magic-88 exhibited moderate level of tolerance with 28.67, 27.45 and 26.53 days for wilting and were found to be on par with one another and close to Magic-289 and RNR-28370. Among the test entries relatively low level of tolerance was exhibited by RNR 29325 and Magic-179 which took relatively less number of days (23.78 and 22.25 respectively) to wilt. These results helped in relative quantification of BPH resistance levels in the genotypes. RNR 28370 and Magic 289 was an effective source of BPH resistance, can be used in resistance breeding programme.