Absorption and Xylem Transport of 33 P-Labeled Phosphorus in Nodulated Soybean Plants

Yoshiaki Yamamura, Seiya Nara, 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
Seiya Nara: 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 7, 1-14

Abstract: Phosphorus (P) is an essential macro-element for plants, and understanding the characteristics of the absorption and transport of P in crops is essential. The low availability of P restricts the growth, nitrogen fixation, and yield of soybean plants. In this research, the radioisotope 33 P was supplied to the culture solution to trace the absorption and transport of P in nodulated soybean plants monitored using an imaging plate. The absorption rate of 33 P was almost the same under the light and dark conditions. The absorption rate of 33 P in the decapitated roots was near to that of the intact plants under light. These results indicate that the P absorption is not affected by evapotranspiration over a short time period. Conversely, the 33 P transport from the roots to the shoot was significantly lower under dark conditions than it was under light conditions, although some 33 P reached the top of the shoots under both the light and dark conditions. The transport of P to the shoots depends on the transpiration supplemented by the root pressure. The multiplication value of the 33 P concentration in the xylem sap and transpiration rate was almost equivalent to the transport rate of 33 P in the intact shoots. This value may be adaptable and used to estimate the transport rate of P for the diagnosis.

Keywords: 33 P; soybean; roots; nodules; shoots; imaging plate; xylem sap; transpiration; diagnosis (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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