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P-efficient P-inefficient P-efficient P-inefficient

Low P High P. HN89 HN92 HN112 HN113. HN89 HN92 HN112 HN113. P-efficient P-inefficient P-efficient P-inefficient.

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P-efficient P-inefficient P-efficient P-inefficient

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  1. Low P High P HN89 HN92 HN112 HN113 HN89 HN92 HN112 HN113 P-efficient P-inefficient P-efficient P-inefficient Supplemental Figure 1. P accumulation for the four soybean genotypes in the field experiment under low-P and high-P soil fertilization conditions.

  2. A) Tap root region > 6cm from the root tip, including lateral roots 0-1.5cm of tap root 1.5-6 cm of tap root 2.0 1.5 1.0 0.5 0 LP, LP+Al B) LP, LP-Al C) Malate exudation (nmol/root tip.hr) 2.0 1.5 1.0 0.5 0 HP, LP+Al D) HP, LP-Al HN89 HN92 HN112 HN113 HN89 HN92 HN112 HN113 HN89 HN92 HN112 HN113 HN89 HN92 HN112 HN113 HN89 HN92 HN112 HN113 HN89 HN92 HN112 HN113 HN89 HN92 HN112 HN113 HN89 HN92 HN112 HN113 6 24 48 72 6 24 48 72 Collection time (hrs after treatment) Supplemental Figure 2. Malate exudation from soybean roots in the divided root chamber experiment. There were 4 treatments that combined 2 P levels (0 or 320 M P as KH2PO4; LP and HP) in the upper compartment, and 2 Al activities (0 or 38 M Al3+ as AlCl3; +/-Al) in the lower compartment. Malate exudation was collected from the 3 compartments and measured by capillary electrophoresis (see Materials and Methods for details).

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