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Concentrations of the auxin indole-3-acetic acid (IAA, A), abscisic acid (ABA) and ABA-glucose ester (ABA-GE) (B) in isogenic embryonal mass (EM) and non-embryogenic callus (NEC) of three genotypes (SD4-8, TD15-1, TD17-1) of Douglas-fir in the proliferation phase of somatic embryogenesis. All data are means ± standard errors for 3–4 replicates. Different letters indicate significant differences according to the multiple comparisons of means (P < 0.05).
