Fig. 4 | Scientific Reports

Fig. 4

From: Effects of nitrogen addition on the growth and photosynthetic physiology of Gleditsia sinensis Lam. seedlings under shading conditions

Fig. 4

Effects of nitrogen addition on Pro and SS contents of G. sinensis under shading treatment. S0, S1, S2 and S3 represent 100% light, 70% light, 40% light and 10% light, respectively. N0, N1, N2 and N3 denote the nitrogen levels of 0 g/plant, 1 g/plant, 3 g/plant and 5 g/plant, respectively. Different capital letters indicate statistically significant differences for nitrogen addition treatments at the same shade level (p < 0.05). Separate lowercase letters indicate significant changes between shade treatments at the same level of nitrogen addition (p < 0.05). A single asterisk (*) denotes a significant difference at the 0.05 probability level, whereas two asterisks (**) signifies a significant difference at the 0.01 probability level. NS indicates that no noteworthy difference was discovered. The reported values are shown as means ± standard error.

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