Abstract

Twenty rainfed low land rice genotypes were evaluated for their stability to grain yield and its component traits under three predictable environments created by changing the method of sowing and date of transplanting viz. direct sowing, normal transplanting and delayed transplanting. The pooled analysis of variance indicated that the mean differences, due to genotypes and genotype x environment interaction were significant indicating that the genotypes differ in their adaptability and stability. The pooled deviations were also significant for all the characters studied, suggested that these genotypes differed in their deviation from linearity. Most of the characters were influenced by non-linear components of G x E interaction, but magnitude of linear components were greater than non-linear types. On the basis of linear components characters, the genotypes RAU 1401-12-2, Satyam, Kishori expressed average response and relative stability under different environment for yield and yield components. Stability for grain yield and its components were also exhibited by the genotypes TTB 517-16-SBIR 70149- 33 and Satyam under favourable environment whereas, genotypes RAU 1305-6-3-2-3 had higher stability under poor environmental condition. The genotypes RAU 1401-12-2 and RAU 1314-3-3-3 were found to be stable under average environment for grain yield per plant. These genotypes are suitable for the rainfed low land condition which will also serve as good parents for the development of high yielding stable lines.

Keywords: Rice, Stability, Rainfed, Lowland, Yield.