Statistical methods for analyzing genotype x environmental interaction effects.

摘要

The ability of genotypes to produce stable and high yield in diverse environments is restricted due to genotype x environmental interaction (GEI) effects. This study presents user friendly graphical methods to perform stability analysis of GEI, and to select genotypes evaluated under multiple environments using TAI's stability analysis, Additive Main Effects and Multiplicative Interaction (AMMI) model, EXPLORGE analysis, and mixed model analyses.;This practical approach integrates statistical and graphical analysis tools available in SASRTM systems. Using the SAS MACRO applications developed for EXPLORGE, TAI and AMMI analyses, horticulturists and plant breeders can effectively and quickly perform genotype selection for wide adaptability and for high yielding under specific environments. The steps involved in downloading the necessary MACRO-CALL files from Fernandez's home page http://www.ag.unr.edu/gf and the instructions for running the SAS MACRO are presented in this thesis. The nature and the distinctive features of the graphics produced by these applications are illustrated using published data.