Environmental factors modify carbon nutritional patterns and niche overlap between Aspergillus flavus and Fusarium verticillioides strains from maize.

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dc.contributor.authorGiorni, Paola
dc.contributor.authorMagan, Naresh
dc.contributor.authorBattilani, Paola
dc.date.accessioned2009-04-24T13:28:00Z
dc.date.available2009-04-24T13:28:00Z
dc.date.issued2009-04-15
dc.description.abstractThis study examined the utilization patterns of key carbon sources (CS, 24: including key sugars, amino acids and fatty acids) in maize by strains of Aspergillus flavus and Fusarium verticillioides under different water activity (aw, 0.87–0.98 aw) and temperature (20–35 °C) values and compared the niche overlap indices (NOI) that estimate the in vitro CS utilization profiles [Wilson, M., Lindow, S.E., 1994. Coexistence among epiphytic bacterial populations mediated through nutritional resource partitioning. Applied and Environmental Microbiology 60, 4468–4477.]. The ability to grow in these key CS in minimal media was studied for 120 h in 12 h steps. The NOI was calculated for inter-species (F. verticillioides–A. flavus) and for intra-species (A. flavus–A. flavus) using CS utilization patterns over the range of interacting environmental conditions. 30 °C, over the whole aw range examined, was found to be optimal for utilization of the maximum number of CS by A. flavus. In contrast, for F. verticillioides this was more so at 20 °C; 25 °C allowed a suboptimal usage of CS for both species. NOIs confirmed the nutritional dominance of A. flavus at 30 °C, especially at lower aw levels and that of F. verticillioides at 20 °C, mainly at 0.95 aw. In other conditions of aw, based on CS utilization patterns, the data indicated that A. flavus and F. verticillioides occupied different ecological niches. The variability in nutritional sources utilization between A. flavus strains was not related to their ability to produce aflatoxins (AFs). This type of data helps to explain the nutritional dominance of fungal species and strains under different environmental conditions. This could be useful in trying to find appropriate natural biocontrol microorganisms to compete with these mycotoxigenic species.en_UK
dc.identifier.citationPaola Giorni, Naresh Magan, Paola Battilani, Environmental factors modify carbon nutritional patterns and niche overlap between Aspergillus flavus and Fusarium verticillioides strains from maize, International Journal of Food Microbiology, Volume 130, Issue 3, 15 April 2009, Pages 213-218en_UK
dc.identifier.issn0168-1605
dc.identifier.urihttp://dx.doi.org/10.1016/j.ijfoodmicro.2009.01.032
dc.identifier.urihttp://hdl.handle.net/1826/3347
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.subjectAspergillus flavusen_UK
dc.subjectFusarium verticillioidesen_UK
dc.subjectWater activityen_UK
dc.subjectTemperatureen_UK
dc.subjectCarbon sourcesen_UK
dc.titleEnvironmental factors modify carbon nutritional patterns and niche overlap between Aspergillus flavus and Fusarium verticillioides strains from maize.en_UK
dc.typePostprinten_UK

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