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Tree Genetics & Genomes

, 14:56 | Cite as

Seasonal bulk xylem pressure in temperate broadleaf eudicot trees: a case study for sugar long-distance transport and signaling

  • Ross Young
  • Root Gorelick
  • Tim Xing
Opinion Paper
  • 88 Downloads
Part of the following topical collections:
  1. Genome Biology

Abstract

Sugars regulate growth, development, and defense in trees. Sugars are also important signaling molecules and are transported over long distances via xylem and phloem. Sucrose loading to tracheids and vessels is associated with bulk xylem pressure and occurs seasonally in temperate broadleaf eudicot trees. Following restoration of xylem hydraulic conductivity in spring, sugars are unloaded from xylem sap at apical branches and deposited as starch before growth of shoot apical meristems. Growth of cambia and shoot apical meristems leads to starch catabolism that yields hexose-phosphates to fuel cell growth and regulate other signal networks. The contrast between cell molecular biology of Arabidopsis and physiology of temperate broadleaf eudicot trees indicates the importance of phosphorylation in long-distance sugar signaling. Hexokinase, acting as a hub for signal and hormone networks, is likely an important regulator of sugar signaling in response to stimuli such as energy status, sugar status, and environmental conditions. The comparative analysis suggested here could help bridge physiology and detailed molecular mechanisms regarding physiology of trees.

Keywords

Sugar signaling Hexokinase Long-distance transport Tree 

Supplementary material

11295_2018_1272_MOESM1_ESM.docx (68 kb)
ESM 1 (DOCX 67 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Biology and Institute of BiochemistryCarleton UniversityOttawaCanada

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