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REGULAR ARTICLE
GGE biplot analysis of genotype-by-environment interaction and grain yield stability of bread wheat genotypes in South Tigray, Ethiopia
Muez Mehari, Mizan Tesfay, Haddis Yirga, Adhiena Mesele, Teklay Abebe, Assefa Workineh, Birhanu Amare
Commun. Biometry Crop Sci. (2015) 10 (1), 17-26.
ABSTRACT
Studying genotype-by-environment interaction and determining representative testing environments are
important for releasing new varieties. Nineteen bread wheat varieties were thus evaluated to study
their adaptability and stability in seven environments of south Tigray. The experiment was carried
out in a randomized complete block design with two replicates in three locations in 2011 and two
locations in 2012 and 2013. Genotype, environment and genotype-by-environment interaction had
significant effects on grain yield. The environment accounted for 78.3%, while the genotype-by-environment
interaction for 14.7% of the variation in grain yield. Based on the polygon view of the GGE biplot,
three mega-environments were detected with different winning genotypes (paven-76, Mada-Walabu and ET-13A2),
which are therefore to be regarded as specifically adapted. Considering simultaneously mean yield and stability,
the best genotypes were Dinkinesh, Gasay, Alidoro, Kakaba and Dand’a, which therefore can be regarded as adapted
to a wide range of environments
Key Words: GGE; genotype; environment; genotype-by-environment interaction.
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