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@INPROCEEDINGS{Agyei:1050716,
      author       = {Agyei, Kwabena and Metzner, Ralf and Pflugfelder, Daniel
                      and Mahlein, Anne-Katrin and Koller, Robert and Huber,
                      Gregor},
      title        = {{I}n vivo quantification of temporal transport velocities
                      and allocation of photoassimilates within sugar beet taproot
                      by tomographic imaging},
      reportid     = {FZJ-2026-00461},
      year         = {2025},
      abstract     = {Sugar beet is the second largest sugar-producing crop,
                      accounting for about $40\%$ of global sugar output. However,
                      there is limited information regarding the phloem transport
                      dynamics of photoassimilates during taproot development,
                      which is a critical process in sugar accumulation. This gap
                      is due to the hidden nature and limited availability of
                      technologies to measure phloem dynamics. To address this,
                      the storage organs of growing sugar beets were assessed
                      using Magnetic Resonance Imaging (MRI) and Positron Emission
                      Tomography (PET). Additionally, plants affected by the
                      rapidly spreading syndrome “basses richesses” (SBR)
                      disease, which leads to an occlusion of the vascular tissues
                      and significant yield losses, were analyzed.We found that
                      generally, flow velocity was highest around 49 and 54 days
                      after planting and substantially decreased until the last
                      measurement at 84 days. Tracer flow velocities, ranging from
                      1.4 to 15.2 mm/min, were fastest in the taproot's inner
                      section. Interestingly, SBR disease did not alter transport
                      velocities. However, PET analysis revealed a heterogeneous
                      distribution of labeled photoassimilates in diseased plants,
                      with SBR-symptomatic taproot sectors showing very low tracer
                      signals. This heterogeneity most probably originates from
                      partial leaf inoculation, leading to an uneven pathogen
                      distribution within the taproot.These results indicate that
                      photoassimilate transport is dynamic, varying by organ,
                      section, and developmental stage. The MRI-PET
                      co-registration further suggests that biotic stressors like
                      SBR impair photoassimilate sink capacity early in taproot
                      development. Combining MRI and PET offers a powerful tool
                      for understanding critical plant processes under
                      developmental or environmental stress.},
      month         = {Oct},
      date          = {2025-10-27},
      organization  = {3rd Workshop Carbon Allocation in
                       Plants, Versailles (France), 27 Oct
                       2025 - 29 Oct 2025},
      subtyp        = {After Call},
      cin          = {IBG-2},
      cid          = {I:(DE-Juel1)IBG-2-20101118},
      pnm          = {2171 - Biological and environmental resources for
                      sustainable use (POF4-217) / DFG project G:(GEPRIS)390732324
                      - EXC 2070: PhenoRob - Robotik und Phänotypisierung für
                      Nachhaltige Nutzpflanzenproduktion (390732324)},
      pid          = {G:(DE-HGF)POF4-2171 / G:(GEPRIS)390732324},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://juser.fz-juelich.de/record/1050716},
}