Skip to main content
release_alert
Welcome to the new Scholars 3.0! Read about new features and let us know what you think.
cancel

Radial-axial transport coordination enhances sugar translocation in the phloem vasculature of plants.

Publication ,  Journal Article
Nakad, M; Domec, J-C; Sevanto, S; Katul, G
Published in: Plant Physiology
August 2022

Understanding mass transport of photosynthates in the phloem of plants is necessary for predicting plant carbon allocation, productivity, and responses to water and thermal stress. Several hypotheses about optimization of phloem structure and function and limitations of phloem transport under drought have been proposed and tested with models and anatomical data. However, the true impact of radial water exchange of phloem conduits with their surroundings on mass transport of photosynthates has not been addressed. Here, the physics of the Munch mechanism of sugar transport is re-evaluated to include local variations in viscosity resulting from the radial water exchange in two dimensions (axial and radial) using transient flow simulations. Model results show an increase in radial water exchange due to a decrease in sap viscosity leading to increased sugar front speed and axial mass transport across a wide range of phloem conduit lengths. This increase is around 40% for active loaders (e.g. crops) and around 20% for passive loaders (e.g. trees). Thus, sugar transport operates more efficiently than predicted by previous models that ignore these two effects. A faster front speed leads to higher phloem resiliency under drought because more sugar can be transported with a smaller pressure gradient.

Duke Scholars

Altmetric Attention Stats
Dimensions Citation Stats

Published In

Plant Physiology

DOI

EISSN

1532-2548

ISSN

0032-0889

Publication Date

August 2022

Volume

189

Issue

4

Start / End Page

2061 / 2071

Related Subject Headings

  • Water
  • Sugars
  • Plants
  • Plant Biology & Botany
  • Phloem
  • Carbohydrates
  • Biological Transport
  • 07 Agricultural and Veterinary Sciences
  • 06 Biological Sciences
 

Citation

APA
Chicago
ICMJE
MLA
NLM
Nakad, M., Domec, J.-C., Sevanto, S., & Katul, G. (2022). Radial-axial transport coordination enhances sugar translocation in the phloem vasculature of plants. Plant Physiology, 189(4), 2061–2071. https://doi.org/10.1093/plphys/kiac231
Nakad, Mazen, Jean-Christophe Domec, Sanna Sevanto, and Gabriel Katul. “Radial-axial transport coordination enhances sugar translocation in the phloem vasculature of plants.Plant Physiology 189, no. 4 (August 2022): 2061–71. https://doi.org/10.1093/plphys/kiac231.
Nakad M, Domec J-C, Sevanto S, Katul G. Radial-axial transport coordination enhances sugar translocation in the phloem vasculature of plants. Plant Physiology. 2022 Aug;189(4):2061–71.
Nakad, Mazen, et al. “Radial-axial transport coordination enhances sugar translocation in the phloem vasculature of plants.Plant Physiology, vol. 189, no. 4, Aug. 2022, pp. 2061–71. Epmc, doi:10.1093/plphys/kiac231.
Nakad M, Domec J-C, Sevanto S, Katul G. Radial-axial transport coordination enhances sugar translocation in the phloem vasculature of plants. Plant Physiology. 2022 Aug;189(4):2061–2071.

Published In

Plant Physiology

DOI

EISSN

1532-2548

ISSN

0032-0889

Publication Date

August 2022

Volume

189

Issue

4

Start / End Page

2061 / 2071

Related Subject Headings

  • Water
  • Sugars
  • Plants
  • Plant Biology & Botany
  • Phloem
  • Carbohydrates
  • Biological Transport
  • 07 Agricultural and Veterinary Sciences
  • 06 Biological Sciences