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. 2014 Oct 23;9(10):e110855. doi: 10.1371/journal.pone.0110855

Figure 2. Effects of exogenous spermidine on chlorophyll fluorescence parameters in tomato seedlings under salinity-alkalinity stress.

Figure 2

Data were measured in the second expanded leaves (numbered basipetally) after salinity-alkalinity treatment for 4 days. Each histogram represents the mean ± standard error of four independent experiments (n = 4). Different letters indicate significant differences between treatments (P<0.05).