Effect of different salt stresses on agro-morphological traits and utilization of salt stress indices for reproductive stage salt tolerance in rice

Abstract

Salinity is known to reduce rice yield in ecosystems prone to salt stress. Seasonal variations in rainfalland temperature require development of rice varieties with differential salinity tolerance. Evaluationof breeding lines under varying salinity levels will help to identify appropriate genotypes for similarsalt affected areas. A set of 34 genetically and geographically diverse, representative rice genotypes wasevaluated in non-stress moderate sodic (pH ∼ 9.5), high sodic (pH ∼ 9.9) and high saline (EC ∼ 10 dS/m)stress environments with three replications in controlled micro-plots/lysimeters for two wet seasonsof 2011 and 2012. The stress intensity (SI) for grain yield under moderate sodic, high sodic and highsaline environments as compared to non-stress was 0.28, 0.77 and 0.56, respectively. Compared to thenon-stress, the per cent grain yield reduction under moderate sodicity ranged from 7 (IR78806-B-B-16-1-2-2-AJY1) to 76% (Pusa 44), while under high sodicity and high salinity, it ranged from 44 (CSR 27) to 97%(PR 120) and 28 (CSR-RIL-50) to 91% (Pusa 44) respectively. Amongst the genotypes evaluated, higheststress tolerance indices (STI) were noticed in genotype CSR 36 (2.17, 1.27 and 1.15 in moderate sodicity,high sodicity and high salinity, respectively), whereas the lowest STI was recorded in genotype NDR 359(0.27 and 0.05 in moderate sodicity, high sodicity) and TR-2000-008 (0.18 in high salinity). Similarly,genotype CSR 36 registered the highest geometric mean productivity (GMP) and mean productivity (MP)in all stress conditions. The biplot analysis of grain yield showed that the stress tolerance attributes MP,GMP, STI and grain yield favored salt tolerant genotypes CSR 23, CSR 27, CSR 36, CSR-RIL-197, HKR 127and IR60997-16-2-3-2-2R. The sensitive genotypes PR 113, PR 114, PR 118, PR 120, Pusa 44, TR-2000-008and VSR 156 were favored by other indices TOL and SSI. Thus, a combination of salt stress indices helpsin selection of stable rice genotypes for reproductive stage salt tolerance. Selection based on salt stressindices coupled with trait correlation resulted in the identification of high yielding reproductive stagesalt tolerant genotypes viz. CSR 36, CSR 23, CSR 27 and CSR-RIL-197.