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Updated: Jul 15, 2026

Rapid One-step Enzymatic Synthesis and All-aqueous Purification of Trehalose Analogues
Published on: February 17, 2017
Improved drought tolerance without undesired side effects in transgenic plants producing trehalose
Sazzad Karim1, Henrik Aronsson, Henrik Ericson
1School of Life Sciences, University of Skövde, Box 408, 541 28, Skövde, Sweden.
Transgenic plants engineered for trehalose (a sugar) production show enhanced drought tolerance. This study presents three strategies to improve stress tolerance in plants without causing growth defects, by optimizing trehalose-6-phosphate synthase (TPS) and trehalose-6-phosphate phosphatase (TPP) gene expression.
Area of Science:
- Plant Biotechnology
- Molecular Biology
- Biochemistry
Background:
- Trehalose accumulation in organisms is a stress response mediated by trehalose-6-phosphate synthase (TPS) and trehalose-6-phosphate phosphatase (TPP).
- Overexpression of TPS in plants enhances drought tolerance but can cause growth defects.
- The protective role of trehalose accumulation is debated due to low levels observed in some transgenic plants.
Purpose of the Study:
- To develop strategies for enhancing plant drought tolerance via trehalose biosynthesis without inducing growth abnormalities.
- To investigate the efficacy of constitutive, stress-inducible, and targeted expression of trehalose biosynthesis genes.
Main Methods:
- Constructed transgenic tobacco plants with dual TPS and TPP genes from Saccharomyces cerevisiae under a constitutive Arabidopsis RuBisCO promoter.
- Utilized a drought-inducible Arabidopsis promoter (AtRAB18) to control ScTPS1 expression, alone or with ScTPS2.
- Directed ScTPS1 to chloroplasts using an Arabidopsis RuBisCO promoter and a transit peptide.
Main Results:
- Successfully engineered plants with enhanced drought tolerance using three distinct expression strategies.
- Demonstrated that trehalose biosynthesis can be modulated for stress tolerance without detrimental growth effects.
- Observed that enhanced drought tolerance is linked to improved water retention, not initial water status.
Conclusions:
- Optimized expression strategies for trehalose biosynthesis genes can confer drought tolerance in plants.
- Targeted and regulated gene expression are key to avoiding pleiotropic growth defects.
- Trehalose accumulation influences plant water retention and root development, offering a promising avenue for crop improvement.
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