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Title: Factors affecting mycotoxin production by Fusarium species
Author: Muller-Plácintá, C. M.
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 2000
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Abstract:
Studies were undertaken to investigate the factors affecting mycotoxin production in Fusarium phytopathogens. The conclusions of this work are divided into the following categories. Substantive findings: 1) Contamination of cereal grains with Fusarium mycotoxins is a global and continuing issue and is likely to remain so until a systematic elucidation of controlling factors has been accomplished. 2) An important observation at the commencement of the research programme examined the validity of using direct TLC analysis of agar culture plugs to establish mycotoxin profiles in Fusarium species. The results in this thesis indicate that this method only detected a limited number of mycotoxins and this was not consistent between surfaces of the plugs tested or between experiments in the preliminary series. 3) A noteworthy observation was that HT-2 toxin production from T-2 toxin was not time-related as claimed by other workers. There may be a real species differences in this respect between F.sporotrichioides and F. poae. 4) Mixtures of carbendazim and propiconazole or carbendazim plus maneb or carbendazim plus maneb plus tridemorph all enhanced T-2 toxin formation. 5) The fungicide-induced enhancement of mycotoxin production has now been extended for the first time to HT-2 toxin and NEO. 6) A substantive finding, not previously noted, is that difenoconazole failed to stimulate T-2 toxin formation at 25°C but was capable of transforming it to HT-2 toxin and then stimulating the production of the latter product. 7) Difenoconazole appears to be a fungicide in a class of its own in that DAS and NEO production are consistently higher than for a large majority of other fungicides tested. 8) NEO production was not substantially affected by fungal exposure to Bavistin, whereas carbendazim acted in a stimulatory manner. It is suggested that this discrepancy is due to fungicide form, an effect not previously reported.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.659738  DOI: Not available
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