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Background <p>Phloem is the long-distance transport tissue of vascular plants in which photoassimilates are distributed from sources (e.g., leaves) to sinks (e.g., roots, fruits). Phloem transport occurs under pressure, making it very sensitive to manipulation and almost experimentally inaccessible. Therefore, functional data on phloem speed and dynamic distribution of photoassimilates along the transport pathway are still scarce, both in trees and herbaceous plants. This study presents a methodological pipeline to image phloem transport in very thin shoots of the model plant Arabidopsis using photosynthetic uptake of <sup>11</sup>CO<sub>2</sub> and state-of-the-art positron emission tomography (PET).</p> Results <p>Successful application of the latest generation preclinical PET scanners allowed <i>in vivo</i> visualization of internal movement of <sup>11</sup>C-labelled photoassimilates inside primary and secondary shoots of 1 to 2&#xa0;mm diameter every 5&#xa0;min. Using this data as input in a compartmental model enabled estimation of (i) phloem front speed, and (ii) radial carbon partitioning between leakage-retrieval phloem, carbon storage and respiratory efflux. The methodology shows that the phloem front speed of recently fixed carbon in primary shoots was almost two-fold the speed in secondary shoots (128 <i>vs.</i> 70&#xa0;µm&#xa0;s<sup>−1</sup>). Furthermore, it was estimated that the fraction of recently fixed <sup>11</sup>CO<sub>2</sub> that was unloaded from the phloem to the surrounding storage cells and retrieved back into the phloem was higher in primary shoots than in secondary shoots, and that allocation to the storage compartment was higher in secondary shoots. Within the primary shoot, the fraction of unloading and retrieval of the <sup>11</sup>C-labelled photosynthates increased towards the inflorescence.</p> Conclusion <p>Here, we demonstrate the synergistic application of high-resolution PET scanning and compartmental modelling as a promising approach to advance our understanding of phloem dynamics in small-dimension plants, such as the model plant Arabidopsis. With this, an opportunity is created to explore the genetic basis of phloem dynamics.</p>

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Investigating phloem transport dynamics in Arabidopsis through compartmental modelling of positron emission tomography data

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年3月30日

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  • Jens Mincke,
  • Karen J. Kloth,
  • Sarah Verbeke,
  • Ken Kersemans,
  • Stefaan Vandenberghe,
  • Christian Vanhove,
  • Kathy Steppe

摘要

Background

Phloem is the long-distance transport tissue of vascular plants in which photoassimilates are distributed from sources (e.g., leaves) to sinks (e.g., roots, fruits). Phloem transport occurs under pressure, making it very sensitive to manipulation and almost experimentally inaccessible. Therefore, functional data on phloem speed and dynamic distribution of photoassimilates along the transport pathway are still scarce, both in trees and herbaceous plants. This study presents a methodological pipeline to image phloem transport in very thin shoots of the model plant Arabidopsis using photosynthetic uptake of 11CO2 and state-of-the-art positron emission tomography (PET).

Results

Successful application of the latest generation preclinical PET scanners allowed in vivo visualization of internal movement of 11C-labelled photoassimilates inside primary and secondary shoots of 1 to 2 mm diameter every 5 min. Using this data as input in a compartmental model enabled estimation of (i) phloem front speed, and (ii) radial carbon partitioning between leakage-retrieval phloem, carbon storage and respiratory efflux. The methodology shows that the phloem front speed of recently fixed carbon in primary shoots was almost two-fold the speed in secondary shoots (128 vs. 70 µm s−1). Furthermore, it was estimated that the fraction of recently fixed 11CO2 that was unloaded from the phloem to the surrounding storage cells and retrieved back into the phloem was higher in primary shoots than in secondary shoots, and that allocation to the storage compartment was higher in secondary shoots. Within the primary shoot, the fraction of unloading and retrieval of the 11C-labelled photosynthates increased towards the inflorescence.

Conclusion

Here, we demonstrate the synergistic application of high-resolution PET scanning and compartmental modelling as a promising approach to advance our understanding of phloem dynamics in small-dimension plants, such as the model plant Arabidopsis. With this, an opportunity is created to explore the genetic basis of phloem dynamics.