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Mean aboveground DW production per plant (g) of sunflower mutants tested in 2013 and 2014. Error bars are SEs (n = 10). IBL04 is the mother line of all mutants. Stars represent significant differences at the level of p < 0.05 (∗), p < 0.01 (∗∗) and p < 0.001 (∗∗∗) between clones within a year (ANOVA, Tukey-HSD). Significant differences between the years for each clone are denoted with the letter a (p < 0.01, t-test).
