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Relative intensity of the isolated NMR regions annotated to 4-aminobutyrate (GABA) (1.882–1.856 ppm) and glutamine (Gln) (2.470–2.440 ppm) at the early growth stage, Gln at the root enlargement stage, and Fru (4.316–4.290 ppm) at the disease development stage. S: susceptible group; and R: resistant group.
