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A, Effects of a series of GA4/7 concentrations on tuber formation. Data are based on 20 single-node cuttings. B, Tuberization frequency on medium with 3.7 μm ABA supplemented with a series of Suc concentrations. C, Tuberization frequencies on media with 8% Suc plus 3.7 μm ABA (closed symbols) and on media with 8% Suc without ABA (open symbols), supplemented with various concentrations of GA4/7.
