EVALUATION OF GENOTYPE BY ENVIRONMENT INTERACTION AND ADAPTABILITY FOR GRAIN YIELD IN RICE (ORYZA SATIVA L.)

Rice is a major world staple food crop, and therefore breeding improved varieties is of ultimate importance.Genotype-by-environment analyses are essential to understand the potential performance of the lines over environments.It is essential that a breeder should have an insight on the critical comparison of different stability models.Twenty-three advanced cultures of rice were tested for three consecutive years for yield and its attributes.To study the genotype x environment interactions, the models given by Eberhart and Russell (1966), Finlay and Wilkinson (1963) and Shukla (1972), Wrickes (1962) ecovalance method, sustainability index and AMMI models were used to determine the correlation between different environments and also to partition the sum of squares caused due to genotype x environment.The results revealed that the genotypes viz., NLR 3542, NLR 3573 and NLR 3585 were found to be stable according to Eberhart and Russell whereas NLR 3587 and NLR 3580 were found to be stable as per Wrickes method.