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Embryo production in Experiments I (A), II (B), III (C), and IV (D). 1x PGR, 0.5x PGR, and 0.1x PGR stand for the concentrations of plant growth regulators 2,4-D and BA in suspension cultures. In Experiments I–III, embryos per plate were counted, and in Experiment IV, it was standardized per g of ET put to maturation plates. Mean values are presented with the SEM. Significant differences between treatments within lines or overall (Total) are marked with different letters.
