Environmental factors related to fungal infection and fumonisin accumulation during the development and drying of white maize kernels
Reid, Lana M.
MetadataShow full item record
In Southern Europe where whole maize kernels are ground and used for making bread and other food products, infection of the kernels by Fusarium verticillioides and subsequent fumonisin contamination pose a serious safety issue. The influence of environmental factors on this fungal infection and mycotoxin
accumulation as the kernel develops has not been fully determined, especially in such food grade maize. The objectives of the present study were to determine which environmental factors may contribute to kernel invasion by F. verticillioides and fumonisin accumulation as kernels develop and dry in naturally infected white maize. Three maize hybrids were planted at two different sowing dates and kernel samples were collected 20, 40, 60, 80 and 100 days after silking. The percentage of kernels infected, and ergosterol and fumonisin contents were recorded for each sampling. F. verticillioides was the most prevalent species identified as the kernels developed. Temperature and moisture conditions during the first 80 days after silking favored natural kernel infection by F. verticillioides rather than by Aspergillus or Penicillium species. Fumonisin was found in kernels as early as 20 days after silking however significant fumonisin accumulation above levels acceptable in the EU did not occur until after physiological maturity of the kernel indicating that kernel drying in the field poses a high risk. Our results suggest that this could be due to increasing kernel damage by insects that favor fungal development, such as the damage by the moth Sitotroga cerealella, and to the occurrence of stress conditions for F. verticillioides growth that could trigger fumonisin biosynthesis, such as exposure to suboptimal temperatures for growth simultaneously with low water activity.
Is part ofInternational Journal of Food Microbiology, 2013, vol. 164, núm. 1 p. 15-22
European research projects
Showing items related by title, author, creator and subject.
Critical environmental and genotypic factors for Fusarium verticillioides infection, fungal growth and fumonisin contamination in maize grown in northwestern Spain Cao, Ana; Santiago, Rogelio; Ramos Girona, Antonio J.; Souto, Carlos; Aguín, Olga; Malvar, Rosa Ana; Brutón, Ana (Elsevier B.V., 2014)In northwestern Spain, where weather is rainy and mild throughout the year, Fusarium verticillioides is the most prevalent fungus in kernels and a significant risk of fumonisin contamination has been exposed. In this study, ...
Cao, Ana; Butrón, Ana; Ramos Girona, Antonio J.; Marín Sillué, Sònia; Souto, Carlos; Santiago, Rogelio (Springer, 2013)Genetic improvement is an emerging method to reduce the levels of fumonisin (FB) contamination in maize, but breeding advances depend on the development of suitable methods to accurately assess the performance of different ...
The effect of enhanced carotenoid content of transgenic maize grain on fungal colonization and mycotoxin content Díaz Gómez, Joana; Marín Sillué, Sònia; Nogareda, Carmina; Sanchis, Daniel; Ramos Girona, Antonio J. (Springer Verlag, 2016)Novel strategies that address vitamin A deficiency have been developed, such as high-carotenoid maize, a biofortified transgenic maize line rich in carotenoids generated by genetic transformation. The South African white ...