Enhanced radiation use efficiency and grain filling rate as the main drivers of grain yield genetic gains in the CIMMYT elite spring wheat yield trial.

4 f) and PM revealed a negative trend over the years, there was significant variation within lines in each year.

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All the traits included in the stepwise regression model showed a highly significant liner increases over the year, while DH was the only one where the quadratic model resulted significant as well (Table 1 ).

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The annual genetic gain for GY was estimated at 0.96% (65 kg ha −1 year −1 ) accompanied by a positive trend in genotype stability over time.

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