Genotype × Environment Interaction and Stability Analysis of Kharif Potato in Koraput Region of Odisha, India

Information about phenotypic stability is useful for the selection of crop varieties as well as for future breeding programs. The phenotypic performance of a genotype is not same under diverse agro-ecological conditions (Ali et al., 2003). Some genotypes may perform well in certain environments, but, fail in several others. Genotypeenvironment (GE) interactions are extremely important in the development and evaluation of plant genotypes because they reduce the genotypic-stability values under diverse environments (Hebert et al., 1995). The concept of stability has been defined in different ways and several biometrical methods including univariate and multivariate ones have been developed to assess stability (Lin et al., 1986; Becker and Leon, 1988). The most widely used one is the regression method which is based on regressing the mean value of each genotype on the environmental index or marginal means of environments (Tesemma et al., 1998; Nagraja et al., 2017).

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