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Polyamine content in the arrested embryos segregated in F2 from the cross between spds2-1 and SPDS1 RNAi lines (nos. 1–3). A, Free polyamines; B, polyamines conjugated in the PCA-soluble fraction. Polyamines were extracted from dry seeds of each plant line and quantified by HPLC. Bars indicate ± se (n = 3).
