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Fig. 2. Photomicrographs of zone I showing the effect of jasmonic acid on cell expansion and differentiation. First tuberization stage (A and B) and second tuberization stage (C and D). Control (A and C). Treated with jasmonic acid (B, D and E). te, Tracheal elements. Bars = 10 µm (A, B and E) and 25 µm (C and D).
