Evaluation of the adaptation of some olive genotypes and cultivars under climatic conditions of tarom using multivariate statistical methods

This research was conducted to study the interaction between genotype × environment and to determine the adaptation of some olive genotypes using multivariate GGEBiplot and AMMI methods. To conduct this research, ninety-two genotypes were collected from all regions of Iran, along with eight Local and Foreign cultivars including: Konservolia, Manzanilla, Koroneiki, Arbequin, Roghani, Tokhm-kabki, Zard and Shenghe cultivars, and were compared in a Randomized Complete Block Design (RCBD) for six years from 2011 to 2016 in Tarom conditions. After collecting the yield per year, in order to eliminate the genetic fluctuations caused by the "Alternate bearing" phenomenon, the "Alternate bearing index" for each genotype in a two-year period was evaluated and was used as a Covariate variable. In combined analysis of data, genotype and environment effects and their interaction effects were significant at 1% level. Among them, the highest justification of variance was done by interaction. Koroneiki cultivar was found to have the highest overall stability, considering the two parameters of performance and stability, Also, the genotypes 'Bn7', 'Bn6' and 'No10' in unfavorable conditions also had an acceptable performance.