Genetic gain in yield and changes associated with physiological traits in Brazilian wheat during the 20th century

By E. Beche, G. Benin, Cristiano Lemes da Silva, L. B. Munaro, J. A. Marchese. 2014

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Genetic Progress in Grain Yield and Physiological Traits in Chinese Wheat Cultivars of Southern Yellow and Huai Valley since 1950 (2017, background): “However, other studies showed no or very small genetic gains in yield potential over time (Graybosch and Peterson, 2010; Matus et al., 2012; Beche et al., 2014).”
The Physiological Basis of the Genetic Progress in Yield Potential of CIMMYT Spring Wheat Cultivars from 1966 to 2009 (2015, background): “…the genetic progress appears to be showing a plateau, for example, winter wheat in the great plains of North America between 1984 and 2008 (Graybosch and Peterson, 2010) and spring wheat in Chile between 1990 and 2000 (Matus et al., 2012) and in Brazil between 1999 and 2009 (Beche et al., 2014).”
Optimizing dry-matter partitioning for increased spike growth, grain number and harvest index in spring wheat (2019, background): “Some of these studies have shown yield progress was also associated with HI64 (Xiao et al. 2012; Beche et al. 2014) while others report no systematic progress in HI in the last65 decades (Shearman et al. 2005; Aisawi et al. 2015).”