Comparison of major biocontrol strains of non-aflatoxigenic<i>Aspergillus flavus</i>for the reduction of aflatoxins and cyclopiazonic acid in maize

Abbas, Hamed K.; Zablotowicz, Robert M.; Horn, Bruce W.; Phillips, Nicholas; Johnson, Bobbie; Jin, Xixuan; Abel, Craig A.

doi:10.1080/19440049.2010.544680

Cited by 101 publications

(87 citation statements)

References 40 publications

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“…Aflatoxin and fumonisins are responsible for illnesses in humans and animals, and cause deterioration of the product resulting in economic losses to growers [8,[22][23][24][25]. Thus, control of aflatoxin and fumonisins is a worldwide priority [26][27][28]. The United States Food and Drug Administration (FDA) has issued "action levels" for mycotoxins in foods and feeds in the US, which mandate the maximum level of aflatoxin at 20 ppb in foods for direct human consumption, but lower levels for some animal feed applications, whereas the action level of fumonisins is set at 2 ppm and is advisory [23,29,30].…”

Section: Introductionmentioning

confidence: 99%

Effect of Planting Density, Irrigation Regimes, and Maize Hybrids with Varying Ear Size on Yield, and Aflatoxin and Fumonisin Contamination Levels

Abbas¹,

Mascagni²,

Bruns³

et al. 2012

AJPS

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Corn (maize, Zea mays L.) hybrids expressing the flexibility trait in ear size (number of kernels per ear) are marketed for ability to give higher yields under adverse conditions. Altered kernel number is associated with altered number of silk, a major route for infection of kernels by aflatoxin-producing fungi such as Aspergillus flavus. The effect of plant density and irrigation level on yield and accumulation of aflatoxins and fumonisins in harvested grain was compared in a fixed-ear hybrid (Pioneer 33K81), a semi-flexible ear hybrid (Pioneer 3223) and a flexible ear hybrid (Golden Acres 8460) over a range of seeding densities (49,400, 61,750, 74,700, 86,450, and 98,800 seeds·ha -1 ) in non-irrigated, moderately-irrigated (6.4 cm soil water deficit) and well-irrigated plots (3.8 cm soil water deficit), during three years with variable rainfall. Irrigation increased yields in all hybrids, but in the absence of irrigation, yields were highest with the semi-flexible ear trait hybrid. In general, the hybrid with the flexible ear trait had lower optimal seeding densities than the other hybrids for each soil water regime. In general, kernel number was least affected by seeding density in the hybrid with fixed-ear trait compared to the semi-and flexible ear hybrids. The lowest levels of aflatoxin and of fumonisin contamination in harvested grain were associated with the flexible ear trait at all rainfall and irrigation levels, but there was no evidence that reducing stress by lowering seeding density reduced mycotoxin contamination. Inoculation with A. flavus resulted in much higher levels of aflatoxin and significantly higher levels of fumonisin contamination in grain of all hybrids under most conditions of rainfall and irrigation, suggesting that factors that promote A. flavus infection can affect production of both mycotoxins.

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Section: Introductionmentioning

confidence: 99%

Effect of Planting Density, Irrigation Regimes, and Maize Hybrids with Varying Ear Size on Yield, and Aflatoxin and Fumonisin Contamination Levels

Abbas¹,

Mascagni²,

Bruns³

et al. 2012

AJPS

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“…This is because a non-aflatoxigenic strain is not always atoxigenic, such as the AF36 biocontrol strain which is non-aflatoxigenic but produces CPA (Abbas et al, 2011).…”

Section: Selection Of Competitor Strainsmentioning

confidence: 99%

A strain ofAspergillus flavusfrom China shows potential as a biocontrol agent for aflatoxin contamination

Zhou

Wei

Selvaraj

et al. 2015

Biocontrol Science and Technology

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A c c e p t e d M a n u s c r i p t 2 Aflatoxins are toxic and carcinogenic secondary metabolites produced by Aspergillus flavus and A. parasiticus. Strains of A. flavus that are non-aflatoxigenic (i.e., incapable of secreting aflatoxins) have proven effective in controlling contamination by these aflatoxin producing species in the field. In the present study, a non-aflatoxigenic A. flavus strain, GD-3, was isolated from a peanut field in Guangdong Province, China. PCR analysis showed that twelve aflatoxin biosynthesis genes (aflT, pksA, nor-1, fas-2, fas-1, aflR, aflJ, adhA, estA, norA, ver-1 and verA) were deleted in GD-3. Co-inoculation with a toxigenic strain, GD-15, at the ratio of 1:10, 1:1, or 10:1 (GD-3:GD-15), showed that GD-3 was capable of reducing detectable aflatoxin levels on three different substrates. This reduction ranged from 33% to 99% and correlated with competitor ratio. These results demonstrated that GD-3 was successful at reducing aflatoxin contamination and showed promise as a potential agent of biocontrol for local farmers.

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“…Others report aflatoxin reduction by up to 66% when atoxigenic strain NRRL 21882 (Afla-Guard) -Syngenta was applied to the soil [23]. It appears that touching or close physical interaction is necessary for atoxigenic strains to outcompete toxigenic strains [24,25].…”

Section: Pre-harvest Agricultural Management Of Aflatoxins a Biologimentioning

confidence: 99%

A review of agricultural aflatoxin management strategies and emerging innovations in sub-Saharan Africa

Monda¹,

Alakonya²

2016

AJFAND

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Aflatoxins are highly carcinogenic secondary metabolites produced by Aspergillus flavus, A. parasiticus and A. nomius. Aflatoxin contamination of food and animal feeds is, therefore, a major food security, food safety, trade, human and domestic animal health concern. Researchers worldwide have suggested various agriculture-based strategies to manage aflatoxigenic Aspergillus species and reduce contamination to safe levels. This paper reviews various agricultural strategies that could be employed to reduce contamination of aflatoxins in food crops and animal feeds, as well as the challenges faced by these reduction strategies. Among these strategies are innovations like Aflasafe TM and solar grain driers. It is hoped that this critique will stimulate refinement of the existing aflatoxin control approaches and innovations to maximize their efficacy.

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Comparison of major biocontrol strains of non-aflatoxigenicAspergillus flavusfor the reduction of aflatoxins and cyclopiazonic acid in maize

Cited by 101 publications

References 40 publications

Effect of Planting Density, Irrigation Regimes, and Maize Hybrids with Varying Ear Size on Yield, and Aflatoxin and Fumonisin Contamination Levels

Effect of Planting Density, Irrigation Regimes, and Maize Hybrids with Varying Ear Size on Yield, and Aflatoxin and Fumonisin Contamination Levels

A strain ofAspergillus flavusfrom China shows potential as a biocontrol agent for aflatoxin contamination

A review of agricultural aflatoxin management strategies and emerging innovations in sub-Saharan Africa

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