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Putrescine (A), spermidine (B), and spermine (C) were extracted from shoots of R goosegrass (black bar) and S goosegrass (white bar) seedlings 0, 30, 60, 90, 120, and 180 min after spraying with paraquat and then quantified by HPLC. Different lowercase letters indicate significant differences at P<0.05 (t-test).
