RADIOISOTOPES
Online ISSN : 1884-4111
Print ISSN : 0033-8303
ISSN-L : 0033-8303
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Article
  • Time-course Analysis of Leaf Position-dependent Phosphorus Allocation in Poplar Using 32P Radioisotope Imaging
    Aoi Hirata, Ryohei Sugita, Kimitsune Ishizaki, Natsuko I Kobayashi, Ke ...
    2026Volume 75Issue 1 Pages 1-11
    Published: March 15, 2026
    Released on J-STAGE: December 10, 2025
    DOIhttps://doi.org/10.3769/radioisotopes.750102
    JOURNAL OPEN ACCESS
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    Phosphorus (P) is preferentially allocated to the young leaves and the shoot apex for efficient utilization in plants, however, the mechanisms underlying this P allocation remain unclear. In this study, we performed nondestructive sequential imaging and autoradiography to observe and quantify the dynamics of P transport from roots to individual leaves in a model tree, poplar. Within 1 h after 32P application, the 32P activity per unit leaf area was nearly uniform across all leaf positions. By 3 h after 32P application, the ratio of 32P activity per unit leaf area in the upper leaves gradually increased. These results suggest that preferential allocation of P absorbed through the roots to upper leaves may occur through the following process: first, xylem-mediated transport after absorption, and second, subsequent phloem-mediated translocation.

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