Comparison between volatile emissions from transgenic apples and from two representative classically bred apple cultivars |
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Authors: | Ute Vogler Anja S Rott Cesare Gessler Silvia Dorn |
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Institution: | 1.ETH Zurich,Institute of Plant Sciences/Applied Entomology,Zurich,Switzerland;2.ETH Zurich,Institute of Integrative Biology/Plant Pathology,Zurich,Switzerland;3.School of Pharmacy and Biomolecular Sciences,University of Brighton,Moulsecoomb, Brighton,UK |
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Abstract: | While most risk assessments contrast a transgenic resistant to its isogenic line, an additional comparison between the transgenic
line and a classically bred cultivar with the same resistance gene would be highly desirable. Our approach was to compare
headspace volatiles of transgenic scab resistant apple plants with two representative cultivars (the isogenic ‘Gala’ and the
scab resistance gene-containing ‘Florina’). As modifications in volatile profiles have been shown to alter plant relationships
with non-target insects, we analysed headspace volatiles from apple plants subjected to different infection types by gas chromatography-mass
spectrometry. Marked differences were found between healthy and leafminer (Phyllonorycter blancardella) infested genotypes, where emissions between the transgenic scab resistant line and the two cultivars differed quantitatively
in four terpenes and an aromatic compound. However, these modified odour emissions were in the range of variability of the
emissions recorded for the two standard cultivars that proved to be crucial references. |
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