The breeder’s equation (Lush, 1937) is a statistical summation of the evolution of quantitative traits. It measures the change in the mean of a population over a single generation as a function of the selection differential (a measure of the difference in mean trait values between selected individuals and the entire population; Falconer and Mackay, 1996). The complexity of multi-locus inheritance (quantitative variation involving many genes) is distilled into the narrow sense heritability h2, the proportion of variation attributed to additive genetic effects. Breeding is targeted at increasing the rate of genetic gain via the components of the equation. This encompasses increasing the selection intensity (the number of individuals selected), the selection accuracy (the precision by which individuals are selected), genetic variation and reducing the years per breeding cycle. All methods of wheat breeding operate within the parameters of the breeder’s equation and new technology must be assessed within the context of increasing the rate of genetic gain.
|Title of host publication||Achieving sustainable cultivation of wheat|
|Subtitle of host publication||Breeding, quality traits, pests and diseases|
|Place of Publication||London|
|Publisher||Burleigh Dodds Science Publishing|
|Number of pages||24|
|Publication status||First published - 31 Oct 2017|
- plant breeding