Meta–analysis using Genstat
In a sugarcane breeding program, multi-environment trials (METs) are conducted across different testing sites, seasons (years) and ratoon crops. Genotype-by-environment interactions (GEI) are therefore complex interactions between genotype and site, year, and ratoon – that limit the identification of superior genotypes. Selecting the best genotype is a key to success in most breeding programs, breeders should consider and use an effective tool to handle such complex data to get better results. Genstat was used in the study of Ramburan (2014) to explore the nature of GEI and illustrate the confounding crop-year effects in sugarcane. In this study, variance components analysis was done by fitting mixed model using REML. AMMI model was use to analyze the GEI and AMMI biplots were used to visualize and interpret the GEI patterns.
Ramburan S. 2014. A multivariate illustration and interpretation of non-repeatable genotype x environment interactions in sugarcane. Field Crops Research. 157: 57-64.