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Quantity of phenolic acids in the root exudates of watermelon on day 15 (A) and day 25 (B), and total phenolic acids (C) after FON inoculation. P-HA, p-hydroxybenzoic acid; PA, phthalic acid; SyA, syringic acid; FA, ferulic acid; SA, salicylic acid; CA, cinnamic acid. All values are presented as mean ± SE. The different letters on the mean values of the same phenolic acid and the same day indicate significant differences among the treatments (P < 0.05, Tukey’s test).
