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Kayvan Agahi, Jafar Ahmadi, Hassan Amiri Oghan, Mohammad Hossein Fotokian and Sedigheh Fabriki Orang

Abstract: In order to assess the genotype by environment interaction (GE) and
select genotypes to exploit narrow and broad adaptations, twenty-two spring
oilseed rape genotypes were subjected to field surveys at five experimental
sites in the 2015-16 and 2016-17 growing seasons. Plant materials were sown
in the form of a randomized complete block design with three replicates. The
additive main effects and multiplicative interaction (AMMI) model was used to
determine the genotype, environment, and GE effects. The sum of squares (SS)
for the first three interaction principal components was very close to the SS for
the GE signal; therefore, AMMI3 was diagnosed as the most accurate model
to optimize predictive accuracy. Hyola 401 had the highest broad adaptability.
In total, the chances of increasing yield were 55.80% from broad adaptations,
26.73% from narrow adaptations with 4 mega-environments, and an additional
17.47% from narrow adaptations with 5 mega-environments.

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