Effects of exogenous γ-aminobutyric acid concentrations on growth and nutrient uptake in trifoliate orange (<i>Poncirus trifoliata</i>) seedlings under boron-deficient and -sufficient conditions.

When the GABA concentration was higher than 0.5 mM, most mineral element concentrations in the roots showed a decreasing trend. 3.4 Mineral element concentrations in stem Compared with the control, the concentrations of P, K, Fe, Cu, and B in the stems of B-deficient seedlings were significantly reduced, while the concentrations of other mineral elements showed no significant differences ( Figure 4 ).

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