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Table 2 Kinetic parameters for P uptake of P deficient poplar

From: Phosphate uptake kinetics and tissue-specific transporter expression profiles in poplar (Populus × canescens) at different phosphorus availabilities





vmax [nmol min−1 g−1]

0.689 (±0.164)a

11.140 (±1.065)b

9.311 (±0.908)b

Km [μM]


25.87 (±9.87)ns

19.85 (±8.11)ns

Cmin [μM]


1.08 (±0.91)ns

1.41 (±1.19)ns

  1. Kinetic parameters (estimate ± standard error) for the uptake of P in plants grown with one of three different P concentrations in the nutrient solution in sand (HP: 641 μM, MP: 6.4 μM, LP: 0.064 μM). Model calculated with data from 6 different plants per treatment. Different letters in rows indicate significant differences at p ≤ 0.05. vmax: maximum uptake rate, Km: Michaelis-Menten constant, Cmin: minimal concentration needed for uptake, n.d.: not determined