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High level fructan accumulation in a transgenic sugar beet
R Sévenier1, R D Hall, I M van der Meer
1Department of Cell Biology, Centre for Plant Breeding and Reproduction Research, Agricultural Research Department (CPRO-DLO), Wageningen, The Netherlands.
Nature Biotechnology
|September 22, 1998
Summary
Transgenic sugar beet now produces fructans due to the introduction of the 1-sucrose:sucrose fructosyl transferase (1-SST) gene from Jerusalem artichoke. This genetic modification successfully converted sucrose into fructans in the taproot without impacting growth.
Area of Science:
- Plant Biotechnology
- Molecular Biology
- Biochemistry
Background:
- Sugar beet (Beta vulgaris) is a major crop primarily grown for sucrose production.
- Fructans are non-structural carbohydrates with potential applications in food and feed industries.
- Genetic engineering offers a pathway to modify crop carbohydrate composition.
Purpose of the Study:
- To engineer sugar beet to synthesize fructans by introducing the 1-sucrose:sucrose fructosyl transferase (1-SST) gene.
- To investigate the efficacy of 1-SST expression in altering carbohydrate profiles in sugar beet taproots and leaves.
- To assess the impact of fructan synthesis on sugar beet phenotype and growth.
Main Methods:
- Isolation of the 1-sucrose:sucrose fructosyl transferase (1-SST) gene from Helianthus tuberosus (Jerusalem artichoke).
- Agrobacterium-mediated transformation of sugar beet with the 1-SST gene.
- Analysis of carbohydrate content (sucrose and fructans) in different plant tissues (taproot and leaves).
- Phenotypic and growth rate assessments under greenhouse conditions.
Main Results:
- Successful transformation of sugar beet with the 1-SST gene resulted in fructan production.
- In the taproot, stored sucrose was almost completely converted into low molecular weight fructans (GF2, GF3, GF4).
- 1-SST expression in leaves led to only minor fructan accumulation.
- No visible phenotypic changes or alterations in taproot growth rate were observed in the modified sugar beet.
Conclusions:
- The 1-SST gene effectively redirects carbon flow from sucrose to fructan synthesis in sugar beet taproots.
- Fructan accumulation in the taproot can be achieved without compromising plant growth or overall phenotype under controlled conditions.
- This study demonstrates the potential for engineering novel carbohydrate storage in crops for industrial applications.