Fig. 2From: Biomass traits and candidate genes for bioenergy revealed through association genetics in coppiced European Populus nigra (L.)Histograms illustrate trait frequency distribution following Box-Cox transformation for a Estimated biomass yield 2013 (EB-13); b Epidermal cell number per leaf (CNPL-13) and c Saccharification potential (glucose yield) 2012 (SP-12)Back to article page