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OLIgo Mass Profiling OLIMP of Extracellular Polysaccharides
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Deficient sucrose synthase activity in developing wood does not specifically affect cellulose biosynthesis, but

Lorenz Gerber1, Bo Zhang2, Melissa Roach1

  • 1Umeå Plant Science Centre, Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, SE 901 83, Umeå, Sweden.

The New Phytologist
|June 13, 2014
PubMed
Summary
This summary is machine-generated.

Sucrose synthase (SUS) is not essential for cellulose synthesis in aspen wood. However, reducing SUS activity impacts wood density and cell wall structure, affecting carbon incorporation.

Keywords:
Populusaspencell wallcellulosesucrose synthase (SUS)wood

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Area of Science:

  • Plant Biology
  • Biochemistry
  • Wood Science

Background:

  • Wood biosynthesis in aspen relies on sucrose metabolism.
  • Cellulose, the primary wood component, is synthesized from UDP-glucose.
  • Sucrose synthase (SUS) was hypothesized to directly supply UDP-glucose for cellulose synthesis.

Purpose of the Study:

  • To investigate the role of SUS in wood biosynthesis.
  • To characterize transgenic aspen with reduced SUS activity in developing wood.

Main Methods:

  • Generation of transgenic hybrid aspen with reduced SUS activity.
  • Glasshouse growth trials.
  • Chemical fingerprinting using pyrolysis-GC/MS.
  • Micromechanical analysis.
  • Wet chemical analysis of wood polymers.
  • Assessment of cell wall structure and density.

Main Results:

  • Transgenic aspen showed no dramatic growth phenotypes.
  • Wood chemistry and ultrastructure were altered in transgenic lines.
  • Wood density decreased, leading to reduced lignin, hemicellulose, and cellulose content per volume.
  • Fibre cell walls exhibited a looser structure, indicated by increased shrinkage upon drying.

Conclusions:

  • SUS is not essential for cellulose biosynthesis in aspen wood.
  • SUS plays a role in determining the total carbon incorporated into wood cell walls.
  • Reduced SUS activity affects wood density and cell wall organization.