Multivariate linear mixed model enhanced the power of identifying genome-wide association to poplar tree heights in a randomized complete block design.

Such a medium number of extremely significant SNPs each explaining a small fraction of the phenotypic variance (0.26%–2.64%) is in accord with the infinitesimal model, assuming that a quantitative trait is typically controlled by an infinite number of genes each with a tiny effect ( Fisher 1919 ; Bulmer 1971 ).

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