Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.485401
Title: Impact of anti-microbial GM plants on soil microbial populations
Author: Gilliam, Lucy
ISNI:       0000 0001 3500 1415
Awarding Body: University of Reading
Current Institution: University of Reading
Date of Award: 2005
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Abstract:
The environmental risk assessment of GM plants is a fast moving area of science. Much research has focused on developing methods to evaluate potential effects on a range of organisms. Microorganisms play an essential role in many soil processes, with the rhizosphere as the prominent site of microbial activity. There is a general need for protocols to assess the effect of anthropogenic influences, the use of different crops and crop rotation an.d as well as GM plants, on the microbial community within the soil. The rhizosp~eres of three crop plants Brassica napus (Oilseed rape), Triticum aestivum (Wheat) and Solanum tuberosum (Potato) were compared using both genetic and functional diversity methods. The rhizospheres of four cultivars of potato were compared; GM potato (variety Kardal) modified with an anti-fungal transgene, GM potato (variety Kardal) with no transgene inserted (empty vector), parental .- line of potato (variety Kardal) and a different cultivar (variety Russet-Burbank). Genetic diversity of bacterial populations isolated from the rhizosphere were compared using PCR amplified DNA of 168 rRNA with denaturing gradient gel electrophoresis (DGGE) to obtain community fingerprints. Activity of the microbial populations was assessed using Biolog G.N MicroPlate™ community substrate utilisation and enzyme activity using a microplate method based on substrates linked to the fluorescent compounds methylumbelliferone (MUB) and 7-amino-4-methyl coumarin (AMC). By comparing the ~M plants to non-GM plants and other crops, observed differences are placed in context. This work shows that the GM line examined.appears to have little effect on soil microbial populations. Detected effects of1he GM potato line were minor compared with other sources of variation observed between plants cultivar or crop species, management practices and sampling time. To date, there has been little evidence that cultivation of GM plants leads to significant changes in microbial popUlations.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.485401  DOI: Not available
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