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Comparison of polyamine contents under drought and salinity stress. Put, Spd, and Spm contents are shown for drought- and salt-tolerant (52, 4, 1) (A) and drought- (22, 2, 50) and salt-sensitive cultivars (22, 2, 50) (B) under control and stress conditions. Each value represents the mean (±s.e.m.) of three cultivars with five replicate plants each. Significance levels are indicated as: p < 0.001 (***), 0.001 < p < 0.01 (**), 0.01 < p < 0.05 (*) in comparison to the respective control.
