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Significance Low availability of nitrogen (N), mainly nitrate in aerobic soils, is a primary limiting factor for crop production. Most terrestrial plants live in symbiosis with arbuscular mycorrhizal (AM) fungi to increase nutrient uptake, including N, from soil. Research on the AM symbiosis field has focused almost exclusively on ammonium as the form of N transferred to the plants, and there has been no direct evidence of N transfer as nitrate thus far. Here, we report that mycorrhizal rice could receive more than 40% of its N via the mycorrhizal pathway and that the AM-specific nitrate transporter OsNPF4.5 accounted for approximately 45% of the mycorrhizal nitrate uptake. Our work suggests the presence of a mycorrhizal route for nitrate uptake in plants.

Functional analysis of the OsNPF4.5 nitrate transporter reveals a conserved mycorrhizal pathway of nitrogen acquisition in plants