Genome-Wide Identification and Expression Analysis of <i>AMT</i> and <i>NRT</i> Gene Family in Pecan (<i>Carya illinoinensis</i>) Seedlings Revealed a Preference for NH₄⁺-N.

In this study, the uptake rates of NH 4 + and NO 3 − gradually saturated with increasing substrate concentrations under a single N source, while they remained on an increasing trend under mixed N source treatments, with the T4 treatment being the most obvious, indicating that NH 4 + and NO 3 − promoted each other’s intake in this study, as evidenced by the magnitude of Vmax values of pecan.

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Previous studies have shown that peach ( Prunus persica ) PpeAMT3;4 was primarily expressed in roots [ 46 ], and the expression pattern of CiAMT2s was similar to that of CiAMT1s , being expressed mostly in roots and almost significantly upregulated at all timepoints under T4.

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