Abstract
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. SAN48 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.
Highlights
Oilseed rape (Brassica napus L.) is an important crop that is grown worldwide for oil extraction
Plant materials of this study consisted of 22 genotypes of spring oilseed rape that were the object of field surveys at five experimental sites over two growing seasons (2015-16 and 2016-17), resulting in 10 environments
Each genotype was cultivated on a 5 × 1.2 m plot consisting of four rows spaced at 30 centimeters
Summary
Oilseed rape (Brassica napus L.) is an important crop that is grown worldwide for oil extraction. In Iran, due to a lack of local production, a considerable portion of edible oil needs is met through imports. The Iranian government has recently considered oilseed rape as the leading prospect for increasing oil production and reducing dependence on imports. Agricultural data show that, in 2017, 12,8567 t of oilseed rape was harvested in Iran from an area of about 70,444 ha, for an average mean yield of about 1825 kg ha–1 (FAO 2018). There is a serious need to increase domestic oilseed production. Several breeding programs have been designed to increase oilseed rape performance
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