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. 2018 Jan 5;69(3):603–617. doi: 10.1093/jxb/erx441

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Fig. 3. — Effects of P availability on the APase activity of soybean roots. (A) Internal APase activity in soybean roots subjected to +P (250 μM KH₂PO₄) or –P (5 μM KH₂PO₄) conditions. Data are means of four replicates ±SE. Asterisks indicate significant differences between the two P treatments: *P<0.05. (B) APase activity on root surfaces of +P and –P soybean plants detected by BCIP staining. Scale bars are 2 cm.