GS activity showed a trend of increasing initially and then decreasing with DKT ( Figure 8A ).
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Potassium deficiency causes more nitrate nitrogen to be stored in leaves for low-K sensitive sweet potato genotypes.
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With DKT, the soluble protein content in sweet potato leaves showed a single peak curve, and the peak value appeared at 5 DKT, while the root soluble protein content showed a decreasing trend ( Figures 4C, D ).