Fig. 2

Analysis of xanthine and uric acid in apple leaves under salt stress. a. MdNAT7 expression during salt stress in Malus domestica cv. ‘Roya Gala’ plants. b–c. The concentrations of xanthine and uric acid in response to salt stress in ‘Roya Gala’ plants at 0, 3, 6, 9, and 12 days. Data are the means and SDs of three replicates. Different letters indicate significant differences between treatments, according to Tukey’s multiple range tests (P < 0.05)