Abstract:The use of mixed nitrate and ammonium supply (mixed-N) as a nitrogen source can improve plant growth. Phytohormones in the xylem sap are involved in root-shoot signaling and regulation of plant growth and development. However, the role of xylem sap phytohormones in the shoot growth with mixed-N supply is poorly understood. Here, pot-grown maize seedlings fed with different nitrogen forms (NO 3 −, NH 4 +, and mixed-N) at 50, 100, 200, and 400 mg N kg −1 soil (N 50, N 100, N 200, and N 400, respectively) were us… Show more
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