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Metabolite fingerprinting in transgenic lettuce
Lee C Garratt1, Robert Linforth, Andrew J Taylor
1Plant Sciences Division, School of Biosciences, University of Nottingham, Sutton Bonington Campus, Loughborough, UK.
Plant Biotechnology Journal
|December 19, 2006
Summary
Transgenic lettuce with a senescence-specific IPT gene showed delayed aging and increased volatile compounds like acetaldehyde and dimethyl sulfide. This highlights metabolic fingerprinting
Area of Science:
- Plant Biotechnology
- Metabolomics
- Molecular Biology
Background:
- Genetic modification of plants can alter metabolic pathways and physiological responses.
- Understanding gene function in crop plants is crucial for improving agricultural traits.
- Senescence is a complex process influenced by genetic and environmental factors.
Purpose of the Study:
- To investigate the effects of expressing the IPT gene under the SAG12 promoter in lettuce.
- To assess changes in metabolite profiles and senescence in transgenic lettuce.
- To apply metabolic fingerprinting for elucidating transgene-induced pleiotropic effects.
Main Methods:
- Generation of transgenic lettuce (Lactuca sativa L. cv. Evola) expressing P(SAG12)-IPT.
- Metabolite fingerprinting using direct atmospheric pressure chemical ionization-mass spectrometry (APCI-MS) and gas chromatography (GC-APCI/EI-MS).
- Comparative analysis of volatile organic compounds (VOCs) and reactive oxygen species (ROS) in transgenic and azygous lettuce.
Main Results:
- Transgenic lettuce exhibited delayed senescence compared to azygous controls.
- Significant increases (up to threefold) in acetaldehyde (m/z 45), ethanol (m/z 47), and dimethyl sulphide (m/z 63) were observed in transgenic plants.
- Increased dimethyl sulphide levels correlated with higher reactive oxygen species (ROS) accumulation in transgenic lettuce heads.
Conclusions:
- Metabolic fingerprinting is effective in identifying physiological changes due to transgene expression.
- The P(SAG12)-IPT construct influences senescence and volatile organic compound production in lettuce.
- Pleiotropic effects of transgene expression can be elucidated through comprehensive metabolic analysis.
