Fig. 2.

Frequency distribution of seed yield (SY) and SY-related traits in the BnaTNDH population grown at an optimal (left) and a low (right) N supplies in three field trials. Tri.1, field trial conducted during 2008–2009; Tri.2, field trial conducted during 2009–2010; Tri.3, field trial conducted during 2010–2011. The dashed and solid arrows indicated the position of phenotypic values of cultivars Tapidor and Ningyou7, respectively. The orange, blue, and red arrows indicated trial 1, trial 2, and trial 3, respectively