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Related Experiment Videos

Fructan biosynthesis in transgenic plants.

Andrew J Cairns1

  • 1Plant Breeding Department, Institute of Grassland and Environmental Research, Plas Gogerddan, Aberystwyth SY23 3EB, Wales, UK. andy.cairns@bbsrc.ac.uk

Journal of Experimental Botany
|January 1, 2003
PubMed
Summary

Transgenic plants accumulate fructans, but at low levels compared to natural carbohydrate fluxes. This minor accumulation suggests a leakage rather than a major shift in plant carbon partitioning, with potential causes including gene expression and enzyme activity issues.

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Area of Science:

  • Plant Biotechnology
  • Metabolic Engineering
  • Carbohydrate Metabolism

Background:

  • Fructans are important reserve carbohydrates in many plants.
  • Genetic engineering aims to enhance fructan accumulation in crops for improved storage or altered metabolism.

Purpose of the Study:

  • To assess fructan accumulation in transgenic plants in relation to natural carbohydrate metabolism.
  • To investigate the efficiency of carbon partitioning into novel fructan products.

Main Methods:

  • Analysis of fructan concentrations in transformed plants.
  • Calculation of carbon flux into transgenic fructan products.
  • Comparison of transgenic flux with natural carbohydrate flux in plants.

Main Results:

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  • Transgenic fructan accumulation was generally low (<20 mg g(-1) fresh mass), representing a minor fraction (0.00005-0.08%) of primary carbohydrate flux.
  • Observed low accumulation is attributed to factors like rare codon usage, low transgene expression, enzyme activity, and product hydrolysis.
  • Transgenic plants exhibited aberrant phenotypes, including stunting, bleaching, necrosis, and reduced starch accumulation.

Conclusions:

  • Transgenic fructan accumulation represents a minor leakage, not a radical modification of carbon partitioning.
  • Aberrant phenotypes suggest metabolic disruptions caused by fructan synthesis pathways.
  • Subcellular mislocalization of transgene products and altered in planta enzyme activity were observed.