Yield stability analysis of gum guar genotypes in North Eastern Karnataka

Abstract

Stability analysis studies for seed yield of ten gum guar genotypes was carried out at five locations during Kharif / Rainy season, 2013-14 using randomized block design. Regression of the mean yield of the individual genotypes on the environmental index and deviations of the regression co-efficient from the unity was used to calculate stability of the trait for each genotype. Pooled analysis of variance for seed yield displayed significant differences among environments, genotypes and environments × genotype interactions advocating the adequacy of stability analysis. Genotype GAUG-13 recorded highest (718.33 Kg/Ha) average mean yield followed by RGC-986(647.40 Kg/Ha), RGC-936-1-5 (646.70 Kg/Ha), HG-884 (635.00 Kg/Ha), HGS-563 (623.83 Kg/Ha) and HG-365 (619.07 Kg/Ha) across locations. Based on stability parameters, genotypes RG-936-1-5-1 (646.70 Kg/Ha) and HG-884 (635.00 Kg/Ha) recorded mean yield above the overall mean along with regression value nearer to unity (bi= 1.07) and (bi= 1.06) and non-significant deviation from regression (S2di = -2277.91) and (S2di = - 4651.56), respectively, indicating the high stability and wider adaptability across the environments