Genotype x environment interaction of near isogenic introgression lines (NIILs) under drought stress and non-stress environments in upland rice (Oryza sativa L.)

N. G. Hanamaratti; P. M. Salimath; C. H. M. Vijayakumar; R. L. Ravikumar; S. T. Kajjidoni

N. G. Hanamaratti University of Agricultural Sciences, Dharwad 580 005
P. M. Salimath University of Agricultural Sciences, Dharwad 580 005
C. H. M. Vijayakumar University of Agricultural Sciences, Dharwad 580 005
R. L. Ravikumar University of Agricultural Sciences, Dharwad 580 005
S. T. Kajjidoni University of Agricultural Sciences, Dharwad 580 005

Keywords: AMMI, ASTABi, drought tolerance, upland rice

Abstract

The superior NIILs selected for productivity under artificial drought condition were evaluated over three drought stress and three non-stress environments. AMMI based stability parameter; ASTABi and Rao’s Index of stability were utilized to interpret the stability among the NIILs under stress and non-stress environments. The grain yield was much sensitive and highly influenced by environment resulting in higher G x E interaction under stress environments. Pooled deviation was highly significant indicating the presence of non-predictable components for grain yield and yield related traits. Based on ASTABi, RF-55-254 was most stable genotype which was also the best for grain yield (6613 kg/ha) in non-stress environments, while it was unstable under stress environments. The genotype, RF-55-198 was superior for yield as well as stability in stress environments and for overall adaptability.