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AGPPase activities and starch content at different developmental stages of sink organs. (a) Barley seeds. (b) Potato tubers. Pretuberized stolon samples, represented by zero tuber diameters, were collected by removing the terminal 3-cm section from their apical end. As tuberization occurred, tubers were removed, washed, and grated according to their diameter. Data are represented as mean ± SD (n = 4).
