By contrast, NRT2.1 S28 was phosphorylated under nitrate starvation and low nitrate supply, and showed a trend for dephosphorylation at high nitrate concentrations (5 mM) ( Fig. 5B ).
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Phosphoregulation in the N-terminus of NRT2.1 affects nitrate uptake by controlling the interaction of NRT2.1 with NAR2.1 and kinase HPCAL1 in Arabidopsis.
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