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. 2018 Jan 26;8:1641. doi: 10.1038/s41598-018-19735-x

Figure 2.

Figure 2

Copper (Cu) concentration and partition ratio of Cu (PRCu) in Swingle citrumelo seedlings grown in nutrient solution with different levels of nitrogen (N; Experiment 1) or calcium (Ca; Experiment 2), followed by 15 days in various Cu concentrations. Legend: high-N: 16.4 mM N; control: 9.4 mM N and 5.7 mM Ca; low-Ca: 1.0 mM Ca; Means of Cu levels followed by different lowercase letters are significantly different by Tukey’s test (p < 0.05). Copper levels between High-N and Control or between Low-Ca and Control followed by an asterisk (*) are significantly different by Tukey’s test (p < 0.05).