Absorption and Transport of Phosphorus in Nodulated Soybean Plants and Diagnosis of Phosphorus Status Using Xylem Sap Analysis

Yoshiaki Yamamura, Kyoko Higuchi, Akihiro Saito and Takuji Ohyama ()
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Yoshiaki Yamamura: Department of Agricultural Chemistry, Faculty of Applied Biosciences, Tokyo University of Agriculture, Tokyo 156-8502, Japan
Kyoko Higuchi: Department of Agricultural Chemistry, Faculty of Applied Biosciences, Tokyo University of Agriculture, Tokyo 156-8502, Japan
Akihiro Saito: Department of Agricultural Chemistry, Faculty of Applied Biosciences, Tokyo University of Agriculture, Tokyo 156-8502, Japan
Takuji Ohyama: Department of Agricultural Chemistry, Faculty of Applied Biosciences, Tokyo University of Agriculture, Tokyo 156-8502, Japan

Agriculture, 2024, vol. 14, issue 3, 1-18

Abstract: Phosphorus (P) is an essential major element for plants. The absorption and transport of P are important for soybean growth and yield, including nodule growth and N 2 fixation. Through an analysis of xylem sap, we investigated how nodulated soybean plants absorb PO 4 via the roots and transport it to the shoot. The nodulated soybean plants were treated with 0, 50, and 250 μM PO 4 concentrations for 1, 3, 7, and 15 days. The PO 4 concentration in the xylem sap significantly decreased after 1 day of P deprivation, and then it gradually decreased for 15 days. The high-concentration (250 μM PO 4 ) treatment increased the PO 4 concentrations in the xylem sap at 7- and 15-day timepoints but not at the 1- or 3-day timepoints. The soybean plants were treated with 0, 25, 50, 100, 150, 250, and 500 μM PO 4 for 3 days. The PO 4 absorption rate increased consistently in conjunction with the increase in the PO 4 concentration; however, the PO 4 concentrations in the xylem sap increased only from 0 to 50 μM PO 4 but were constant under higher P concentrations. The soybean plants accumulated extra PO 4 in the roots. The PO 4 concentration in the xylem sap immediately reflected the P deficiency conditions; thus, this index may be used as an indicator for the diagnosis of P deficiency.

Keywords: phosphate; absorption; transport; soybean; xylem sap; ureides; amides (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2024
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