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Effects of exogenous spermidine and D-arg on the free Spd (a), Spm (b), Put (c) and Total free polyamines (d) contents of lettuce under high-temperature stress. Vertical bars represent standard deviations of the mean (n = 3). Values above each vertical bar followed by different letters show significant differences (p < 0.05). CK, 22 °C/17 °C, deionized water; H, 35 °C/30 °C, deionized water; HD, 35 °C/30 °C, 1 mM D-arg; HDS, 1 mM D-arg+ 1 mM Spd.
