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Multi-location trialsin breeding program of any crop are important to find the genotype × environment interaction and selection
of supreme genotypes across different environments. Present study was conducted to determine the stability and adaptability
of 12onion genotypes in six distinct environments. The experiments were laid out in triplicate randomized complete block
design at six locations in 2018-19 viz., Faisalabad-1, Bahawalpur-1, Multan, Faisalabad- 2, Bahawalpur-2 and Raiwind. The
combined analysis of variance revealed significant differences among the genotypes, environments, and genotype ×
environment interaction. The scores of principal component 1 (PC1) and principal component 2 (PC2) cumulatively explained
97.13 % of the total variation due to genotype and genotype × environment interaction which were used to draw GGE biplot.
Genotypes with score near to zero on both PCs considered as stable one while genotypes with large scores are catagorized as
less stable. Phulkara and VRIO-1 were best genotypes in terms of high average yield and stability across multi-location testing.
Dark red was the ideal genotype followed by VRIO-1 and Phulkara. The polygon view of GGE biplot exhibits that genotypes:
Dark red, Desi red, Early red, Husri and VRIO-2 are highly diverse. Due to more representativeness Bahawalpur-2 was
identified as best location among the tested environments for general cultivation of these genotypes. One mega-environment
was identified comprised of all tested locations for onion cultivation and all the tested locations are significantly correlated
with each other. Thus, GGE biplot technique with graphical display gives an overview of mean performance and stability
which is useful for identifying locations with good genotype performance and for efficient use of available resources for the
testing program
Mehvish Tahir, Saba Aleem, Muneeb Munawar, Nusrat Parveen, Etlas Amin , Rasheda Aslam , Akhter Saeed , Muhammad Najeebullah. (2020) GGE BIPLOT AN EFFECTIVE TOOL TO STUDY GENOTYPE AND GENOTYPE × ENVIRONMENT INTERACTION; A CASE STUDY IN ONION (Allium cepa. L), Pakistan Journal of Agricultural Sciences, Volume 57, Issue 6.
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