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Relative salicylic acid (SA) levels in phloem and honeydew. Honeydew (a) and phloem sap (b) were collected, treated with and without β-glucosidase, and analyzed by LC-MS/MS for SA and sugar (hexose + dihexose) content. N = 4; * indicates a significant difference (Student’s T-test, P < 0.05); error bars represent standard errors
