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Tan S, Ma F, Wu Y, Xu Y, Niu A, Chen Y, Wang G, Qiu W. The biodiversity of Aspergillus flavus in stored rice grain leads to a decrease in the overall aflatoxin B 1 production in these species. Int J Food Microbiol 2023; 406:110416. [PMID: 37769398 DOI: 10.1016/j.ijfoodmicro.2023.110416] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2023] [Revised: 09/11/2023] [Accepted: 09/22/2023] [Indexed: 09/30/2023]
Abstract
Aspergillus flavus is a significant fungus that poses a threat to food safety by producing mycotoxins in various crops. In this study, A. flavus isolates were obtained from storage rice collected from seven provinces in southern China, and their AFB1 production, biosynthesis genes presence, and diversity were detected. Results showed that 56 out of the 81 A. flavus isolates produced detectable levels of AFB1, and 71 isolates (87.6 %) possessed aflR gene in their AF synthesis gene cluster, while only 41 isolates (50.6 %) had the ver-1 gene present. Genetic diversity analysis using inter-simple sequence repeats (ISSR) markers revealed seven main clusters among the isolates and the genetic similarity coefficients of 81 A. flavus isolates ranged from 0.53 to 1.00. Additionally, coculture assays were conducted using two toxigenic and two atoxigenic isolates from the same grain depot to investigate the effect of intraspecific inhibition on AFB1 production and to assess the AFB1 contamination risk of storage rice. The in situ results demonstrated that the atoxigenic isolates effectively inhibited the AFB1 contamination of toxigenic isolates. These findings provide insight into the genetic diversity of A. flavus isolates populations and highlight the potential food safety hazards of them in stored rice grain in China.
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Affiliation(s)
- Song Tan
- College of Food Science and Engineering, Nanjing University of Finance and Economics, Nanjing 210023, China; Collaborative Innovation Center for Modern Grain Circulation and Safety, Nanjing University of Finance and Economics, Nanjing 210023, China; Key Laboratory of Grains and Oils Quality Control and Processing, Nanjing University of Finance and Economics, Nanjing 210023, China
| | - Fang Ma
- Institute of Veterinary Immunology & Engineering, National Research Center of Engineering and Technology for Veterinary Biologicals, Jiangsu Key Laboratory for Food Quality and Safety-State Key Laboratory Cultivation Base, Ministry of Science and Technology, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
| | - Yajie Wu
- College of Food Science and Engineering, Nanjing University of Finance and Economics, Nanjing 210023, China; Collaborative Innovation Center for Modern Grain Circulation and Safety, Nanjing University of Finance and Economics, Nanjing 210023, China; Key Laboratory of Grains and Oils Quality Control and Processing, Nanjing University of Finance and Economics, Nanjing 210023, China
| | - Yuancheng Xu
- College of Food Science and Engineering, Nanjing University of Finance and Economics, Nanjing 210023, China; Collaborative Innovation Center for Modern Grain Circulation and Safety, Nanjing University of Finance and Economics, Nanjing 210023, China; Key Laboratory of Grains and Oils Quality Control and Processing, Nanjing University of Finance and Economics, Nanjing 210023, China
| | - Ajuan Niu
- College of Food Science and Engineering, Nanjing University of Finance and Economics, Nanjing 210023, China; Collaborative Innovation Center for Modern Grain Circulation and Safety, Nanjing University of Finance and Economics, Nanjing 210023, China; Key Laboratory of Grains and Oils Quality Control and Processing, Nanjing University of Finance and Economics, Nanjing 210023, China
| | - Yuping Chen
- College of Food Science and Engineering, Nanjing University of Finance and Economics, Nanjing 210023, China; Collaborative Innovation Center for Modern Grain Circulation and Safety, Nanjing University of Finance and Economics, Nanjing 210023, China; Key Laboratory of Grains and Oils Quality Control and Processing, Nanjing University of Finance and Economics, Nanjing 210023, China
| | - Guangyu Wang
- College of Food Science and Engineering, Nanjing University of Finance and Economics, Nanjing 210023, China; Collaborative Innovation Center for Modern Grain Circulation and Safety, Nanjing University of Finance and Economics, Nanjing 210023, China; Key Laboratory of Grains and Oils Quality Control and Processing, Nanjing University of Finance and Economics, Nanjing 210023, China.
| | - Weifen Qiu
- College of Food Science and Engineering, Nanjing University of Finance and Economics, Nanjing 210023, China; Collaborative Innovation Center for Modern Grain Circulation and Safety, Nanjing University of Finance and Economics, Nanjing 210023, China; Key Laboratory of Grains and Oils Quality Control and Processing, Nanjing University of Finance and Economics, Nanjing 210023, China
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Wang X, Wang D, Zhang S, Zhu M, Yang Q, Dong J, Zhang Q, Feng P. Research Progress Related to Aflatoxin Contamination and Prevention and Control of Soils. Toxins (Basel) 2023; 15:475. [PMID: 37624232 PMCID: PMC10467090 DOI: 10.3390/toxins15080475] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2023] [Revised: 07/20/2023] [Accepted: 07/21/2023] [Indexed: 08/26/2023] Open
Abstract
Aflatoxins are potent carcinogenic compounds, mainly produced by fungi species of the genus Aspergillus in the soil. Because of their stability, they are difficult to remove completely, even under extreme conditions. Aflatoxin contamination is one of the main causes of safety in peanuts, maize, wheat and other agricultural products. Aflatoxin contamination originates from the soil. Through the investigation of soil properties and soil microbial distribution, the sources of aflatoxin are identified, aflatoxin contamination is classified and analysed, and post-harvest crop detoxification and corresponding contamination prevention measures are identified. This includes the team's recent development of the biofungicide ARC-BBBE (Aflatoxin Rhizobia Couple-B. amyloliquefaciens, B. laterosporu, B. mucilaginosus, E. ludwiggi) for field application and nanomaterials for post-production detoxification of cereals and oilseed crops, providing an effective and feasible approach for the prevention and control of aflatoxin contamination. Finally, it is hoped that effective preventive and control measures can be applied to a large number of cereal and oilseed crops.
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Affiliation(s)
- Xue Wang
- Xiangyang Academy of Agricultural Sciences, Xiangyang 441057, China; (X.W.); (M.Z.); (Q.Y.); (J.D.); (P.F.)
- Oil Crops Research Institute, Chinese Academy of Agricultural Sciences, Wuhan 430062, China;
- Hubei Hongshan Laboratory, Wuhan 430061, China
| | - Dun Wang
- Xiangyang Academy of Agricultural Sciences, Xiangyang 441057, China; (X.W.); (M.Z.); (Q.Y.); (J.D.); (P.F.)
- Oil Crops Research Institute, Chinese Academy of Agricultural Sciences, Wuhan 430062, China;
- Hubei Hongshan Laboratory, Wuhan 430061, China
| | - Shujuan Zhang
- Zhejiang Mariculture Research Institution, Wenzhou 325000, China;
| | - Mengjie Zhu
- Xiangyang Academy of Agricultural Sciences, Xiangyang 441057, China; (X.W.); (M.Z.); (Q.Y.); (J.D.); (P.F.)
| | - Qing Yang
- Xiangyang Academy of Agricultural Sciences, Xiangyang 441057, China; (X.W.); (M.Z.); (Q.Y.); (J.D.); (P.F.)
| | - Jing Dong
- Xiangyang Academy of Agricultural Sciences, Xiangyang 441057, China; (X.W.); (M.Z.); (Q.Y.); (J.D.); (P.F.)
| | - Qi Zhang
- Oil Crops Research Institute, Chinese Academy of Agricultural Sciences, Wuhan 430062, China;
- Hubei Hongshan Laboratory, Wuhan 430061, China
| | - Peng Feng
- Xiangyang Academy of Agricultural Sciences, Xiangyang 441057, China; (X.W.); (M.Z.); (Q.Y.); (J.D.); (P.F.)
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Trinh LL, Le Nguyen AM, Nguyen HH. Root-associated bacteria Bacillus albus and Bacillus proteolyticus promote the growth of peanut seedlings and protect them from the aflatoxigenic Aspergillus flavus CDP2. BIOCATALYSIS AND AGRICULTURAL BIOTECHNOLOGY 2023. [DOI: 10.1016/j.bcab.2022.102582] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Zhang S, Wang X, Wang D, Chu Q, Zhang Q, Yue X, Zhu M, Dong J, Li L, Jiang X, Yang Q, Zhang Q. Discovery of the Relationship between Distribution and Aflatoxin Production Capacity of Aspergillusspecies and Soil Types in Peanut Planting Areas. Toxins (Basel) 2022; 14:toxins14070425. [PMID: 35878163 PMCID: PMC9322012 DOI: 10.3390/toxins14070425] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2022] [Revised: 06/16/2022] [Accepted: 06/17/2022] [Indexed: 11/16/2022] Open
Abstract
In order to study the relationship between the distribution and aflatoxin production capacity of Aspergillus species and soil types, 35 soil samples were collected from the main peanut planting areas in Xiangyang, which has 19.7 thousand square kilometers and is located in a special area with different soil types. The soil types of peanut planting areas in Xiangyang are mainly sandy loam and clay loam, and most of the soil is acidic, providing unique nature conditions for this study. The results showed that the Aspergillus sp. population in clay loam (9050 cfu/g) was significantly larger than that in sandy loam (3080 cfu/g). The percentage of atoxigenic Aspergillus strains isolated from sandy loam samples was higher than that from clay loam samples, reaching 58.5%. Meanwhile the proportion of high toxin-producing strains from clay loam (39.7%) was much higher than that from sandy loam (7.3%). Under suitable culture conditions, the average aflatoxin production capacity of Aspergillus isolates from clay loam samples (236.97 μg/L) was higher than that of strains from sandy loam samples (80.01 μg/L). The results inferred that under the same regional climate conditions, the density and aflatoxin production capacity of Aspergillus sp. in clay loam soil were significantly higher than that in sandy loam soil. Therefore, peanuts from these planting areas are at a relatively higher risk of contamination by Aspergillus sp. and aflatoxins.
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Affiliation(s)
- Shujuan Zhang
- Xiangyang Academy of Agricultural Sciences, Xiangyang 441057, China; (S.Z.); (X.W.); (Q.C.); (Q.Z.); (M.Z.); (J.D.); (L.L.); (X.J.); (Q.Y.)
- Key Laboratory of Detection for Biotoxins and Key Laboratory of Biology and Genetic Improvement of Oil Crops, Ministry of Agriculture and Rural Affairs, Oil Crops Research Institute, Chinese Academy of Agricultural Sciences, Wuhan 430062, China;
- Zhejiang Mariculture Research Institution, Wenzhou 325000, China
| | - Xue Wang
- Xiangyang Academy of Agricultural Sciences, Xiangyang 441057, China; (S.Z.); (X.W.); (Q.C.); (Q.Z.); (M.Z.); (J.D.); (L.L.); (X.J.); (Q.Y.)
| | - Dun Wang
- Xiangyang Academy of Agricultural Sciences, Xiangyang 441057, China; (S.Z.); (X.W.); (Q.C.); (Q.Z.); (M.Z.); (J.D.); (L.L.); (X.J.); (Q.Y.)
- Key Laboratory of Detection for Biotoxins and Key Laboratory of Biology and Genetic Improvement of Oil Crops, Ministry of Agriculture and Rural Affairs, Oil Crops Research Institute, Chinese Academy of Agricultural Sciences, Wuhan 430062, China;
- Hubei Hongshan Laboratory, Wuhan 430061, China
- Correspondence: (D.W.); (Q.Z.)
| | - Qianmei Chu
- Xiangyang Academy of Agricultural Sciences, Xiangyang 441057, China; (S.Z.); (X.W.); (Q.C.); (Q.Z.); (M.Z.); (J.D.); (L.L.); (X.J.); (Q.Y.)
| | - Qian Zhang
- Xiangyang Academy of Agricultural Sciences, Xiangyang 441057, China; (S.Z.); (X.W.); (Q.C.); (Q.Z.); (M.Z.); (J.D.); (L.L.); (X.J.); (Q.Y.)
| | - Xiaofeng Yue
- Key Laboratory of Detection for Biotoxins and Key Laboratory of Biology and Genetic Improvement of Oil Crops, Ministry of Agriculture and Rural Affairs, Oil Crops Research Institute, Chinese Academy of Agricultural Sciences, Wuhan 430062, China;
- Hubei Hongshan Laboratory, Wuhan 430061, China
| | - Mengjie Zhu
- Xiangyang Academy of Agricultural Sciences, Xiangyang 441057, China; (S.Z.); (X.W.); (Q.C.); (Q.Z.); (M.Z.); (J.D.); (L.L.); (X.J.); (Q.Y.)
| | - Jing Dong
- Xiangyang Academy of Agricultural Sciences, Xiangyang 441057, China; (S.Z.); (X.W.); (Q.C.); (Q.Z.); (M.Z.); (J.D.); (L.L.); (X.J.); (Q.Y.)
| | - Li Li
- Xiangyang Academy of Agricultural Sciences, Xiangyang 441057, China; (S.Z.); (X.W.); (Q.C.); (Q.Z.); (M.Z.); (J.D.); (L.L.); (X.J.); (Q.Y.)
| | - Xiangguo Jiang
- Xiangyang Academy of Agricultural Sciences, Xiangyang 441057, China; (S.Z.); (X.W.); (Q.C.); (Q.Z.); (M.Z.); (J.D.); (L.L.); (X.J.); (Q.Y.)
| | - Qing Yang
- Xiangyang Academy of Agricultural Sciences, Xiangyang 441057, China; (S.Z.); (X.W.); (Q.C.); (Q.Z.); (M.Z.); (J.D.); (L.L.); (X.J.); (Q.Y.)
| | - Qi Zhang
- Key Laboratory of Detection for Biotoxins and Key Laboratory of Biology and Genetic Improvement of Oil Crops, Ministry of Agriculture and Rural Affairs, Oil Crops Research Institute, Chinese Academy of Agricultural Sciences, Wuhan 430062, China;
- Hubei Hongshan Laboratory, Wuhan 430061, China
- Correspondence: (D.W.); (Q.Z.)
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Mohammed A, Faustinelli PC, Chala A, Dejene M, Fininsa C, Ayalew A, Ojiewo CO, Hoisington DA, Sobolev VS, Martínez-Castillo J, Arias RS. Genetic fingerprinting and aflatoxin production of Aspergillus section Flavi associated with groundnut in eastern Ethiopia. BMC Microbiol 2021; 21:239. [PMID: 34454439 PMCID: PMC8403416 DOI: 10.1186/s12866-021-02290-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2021] [Accepted: 07/25/2021] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Aspergillus species cause aflatoxin contamination in groundnut kernels, being a health threat in agricultural products and leading to commodity rejection by domestic and international markets. Presence of Aspergillus flavus and A. parasiticus colonizing groundnut in eastern Ethiopia, as well as presence of aflatoxins have been reported, though in this region, no genetic studies have been done of these species in relation to their aflatoxin production. RESULTS In this study, 145 Aspergillus isolates obtained from groundnut kernels in eastern Ethiopia were genetically fingerprinted using 23 Insertion/Deletion (InDel) markers within the aflatoxin-biosynthesis gene cluster (ABC), identifying 133 ABC genotypes. Eighty-four isolates were analyzed by Ultra-Performance Liquid Chromatography (UPLC) for in vitro aflatoxin production. Analysis of genetic distances based on the approximately 85 kb-ABC by Neighbor Joining (NJ), 3D-Principal Coordinate Analysis (3D-PCoA), and Structure software, clustered the isolates into three main groups as a gradient in their aflatoxin production. Group I, contained 98% A. flavus, including L- and non-producers of sclerotia (NPS), producers of B1 and B2 aflatoxins, and most of them collected from the lowland-dry Babile area. Group II was a genetic admixture population of A. flavus (NPS) and A. flavus S morphotype, both low producers of aflatoxins. Group III was primarily represented by A. parasiticus and A. flavus S morphotype isolates both producers of B1, B2 and G1, G2 aflatoxins, and originated from the regions of Darolabu and Gursum. The highest in vitro producer of aflatoxin B1 was A. flavus NPS N1436 (77.98 μg/mL), and the highest producer of aflatoxin G1 was A. parasiticus N1348 (50.33 μg/mL), these isolates were from Gursum and Darolabu, respectively. CONCLUSIONS To the best of our knowledge, this is the first study that combined the use of InDel fingerprinting of the ABC and corresponding aflatoxin production capability to describe the genetic diversity of Aspergillus isolates from groundnut in eastern Ethiopia. Three InDel markers, AFLC04, AFLC08 and AFLC19, accounted for the main assignment of individuals to the three Groups; their loci corresponded to aflC (pksA), hypC, and aflW (moxY) genes, respectively. Despite InDels within the ABC being often associated to loss of aflatoxin production, the vast InDel polymorphism observed in the Aspergillus isolates did not completely impaired their aflatoxin production in vitro.
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Affiliation(s)
- Abdi Mohammed
- School of Plant Science, College of Agriculture and Environmental Sciences, Haramaya University, P.O. Box 138, Dire Dawa, Ethiopia
| | - Paola C Faustinelli
- United States Department of Agriculture-Agricultural Research Service-National Peanut Research Laboratory, Dawson, GA, 39842-0509, USA
| | - Alemayehu Chala
- College of Agriculture, Hawassa University, P.O. Box 5, Hawassa, Ethiopia
| | - Mashilla Dejene
- School of Plant Science, College of Agriculture and Environmental Sciences, Haramaya University, P.O. Box 138, Dire Dawa, Ethiopia
| | - Chemeda Fininsa
- School of Plant Science, College of Agriculture and Environmental Sciences, Haramaya University, P.O. Box 138, Dire Dawa, Ethiopia
| | - Amare Ayalew
- Partnership for Aflatoxin Control in Africa (PACA), African Union Commission, Addis Ababa, Ethiopia
| | - Chris O Ojiewo
- ICRISAT - Nairobi, UN-Avenue, Box 39063-00623, Nairobi, Kenya
| | - David A Hoisington
- College of Agriculture and Environmental Sciences, Peanut and Mycotoxin Innovation Lab, University of Georgia, Athens, GA, 30602-4356, USA
| | - Victor S Sobolev
- United States Department of Agriculture-Agricultural Research Service-National Peanut Research Laboratory, Dawson, GA, 39842-0509, USA
| | - Jaime Martínez-Castillo
- Centro de Investigación Científica de Yucatán A.C., Unidad de Recursos Naturales, Calle 43 No. 130, Colonia Chuburná de Hidalgo CP 97200, Mérida, Mexico
| | - Renee S Arias
- United States Department of Agriculture-Agricultural Research Service-National Peanut Research Laboratory, Dawson, GA, 39842-0509, USA.
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Islam M, Callicott KA, Mutegi C, Bandyopadhyay R, Cotty PJ. Distribution of active ingredients of a commercial aflatoxin biocontrol product in naturally occurring fungal communities across Kenya. Microb Biotechnol 2021; 14:1331-1342. [PMID: 33336897 PMCID: PMC8313261 DOI: 10.1111/1751-7915.13708] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2020] [Revised: 10/27/2020] [Accepted: 10/28/2020] [Indexed: 11/28/2022] Open
Abstract
Human populations in Kenya are repeatedly exposed to dangerous aflatoxin levels through consumption of contaminated crops. Biocontrol with atoxigenic Aspergillus flavus is an effective method for preventing aflatoxin in crops. Although four atoxigenic A. flavus isolates (C6E, E63I, R7H and R7K) recovered from maize produced in Kenya are registered as active ingredients for a biocontrol product (Aflasafe KE01) directed at preventing contamination, natural distributions of these four genotypes prior to initiation of commercial use have not been reported. Distributions of the active ingredients of KE01 based on haplotypes at 17 SSR loci are reported. Incidences of the active ingredients and closely related haplotypes were determined in soil collected from 629 maize fields in consecutive long and short rains seasons of 2012. The four KE01 haplotypes were among the top ten most frequent. Haplotype H-1467 of active ingredient R7K was the most frequent and widespread haplotype in both seasons and was detected in the most soils (3.8%). The four KE01 haplotypes each belonged to large clonal groups containing 27-46 unique haplotypes distributed across multiple areas and in 21% of soils. Each of the KE01 haplotypes belonged to a distinct vegetative compatibility group (VCG), and all A. flavus with haplotypes matching a KE01 active ingredient belonged to the same VCG as the matching active ingredient as did all A. flavus haplotypes differing at only one SSR locus. Persistence of the KE01 active ingredients in Kenyan agroecosystems is demonstrated by detection of identical SSR haplotypes six years after initial isolation. The data provide baselines for assessing long-term influences of biocontrol applications in highly vulnerable production areas of Kenya.
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Affiliation(s)
- Md‐Sajedul Islam
- School of Plant SciencesUSDA‐ARSThe University of ArizonaTucsonAZ85721USA
| | | | - Charity Mutegi
- International Institute of Tropical AgricultureNairobiKenya
| | | | - Peter J. Cotty
- School of Plant SciencesUSDA‐ARSThe University of ArizonaTucsonAZ85721USA
- College of Food Science and EngineeringOcean University of ChinaQingdaoShandong266003China
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Khan R, Ghazali FM, Mahyudin NA, Samsudin NIP. Biocontrol of Aflatoxins Using Non-Aflatoxigenic Aspergillus flavus: A Literature Review. J Fungi (Basel) 2021; 7:jof7050381. [PMID: 34066260 PMCID: PMC8151999 DOI: 10.3390/jof7050381] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2021] [Revised: 05/07/2021] [Accepted: 05/08/2021] [Indexed: 02/06/2023] Open
Abstract
Aflatoxins (AFs) are mycotoxins, predominantly produced by Aspergillus flavus, A. parasiticus, A. nomius, and A. pseudotamarii. AFs are carcinogenic compounds causing liver cancer in humans and animals. Physical and biological factors significantly affect AF production during the pre-and post-harvest time. Several methodologies have been developed to control AF contamination, yet; they are usually expensive and unfriendly to the environment. Consequently, interest in using biocontrol agents has increased, as they are convenient, advanced, and friendly to the environment. Using non-aflatoxigenic strains of A. flavus (AF−) as biocontrol agents is the most promising method to control AFs’ contamination in cereal crops. AF− strains cannot produce AFs due to the absence of polyketide synthase genes or genetic mutation. AF− strains competitively exclude the AF+ strains in the field, giving an extra advantage to the stored grains. Several microbiological, molecular, and field-based approaches have been used to select a suitable biocontrol agent. The effectiveness of biocontrol agents in controlling AF contamination could reach up to 99.3%. Optimal inoculum rate and a perfect time of application are critical factors influencing the efficacy of biocontrol agents.
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Affiliation(s)
- Rahim Khan
- Department of Food Science, Faculty of Food Science and Technology, Universiti Putra Malaysia, Serdang 43400, Malaysia; (R.K.); (N.I.P.S.)
| | - Farinazleen Mohamad Ghazali
- Department of Food Science, Faculty of Food Science and Technology, Universiti Putra Malaysia, Serdang 43400, Malaysia; (R.K.); (N.I.P.S.)
- Correspondence: ; Tel.: +60-12219-8912
| | - Nor Ainy Mahyudin
- Department of Food Service and Management, Faculty of Food Science and Technology, Universiti Putra Malaysia, Serdang 43400, Malaysia;
- Laboratory of Halal Science Research, Halal Products Research Institute, Universiti Putra Malaysia, Serdang 43400, Malaysia
| | - Nik Iskandar Putra Samsudin
- Department of Food Science, Faculty of Food Science and Technology, Universiti Putra Malaysia, Serdang 43400, Malaysia; (R.K.); (N.I.P.S.)
- Laboratory of Food Safety and Food Integrity, Institute of Tropical Agriculture and Food Security, Universiti Putra Malaysia, Serdang 43400, Malaysia
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Tran MT, Ameye M, Thi-Kim Phan L, Devlieghere F, De Saeger S, Eeckhout M, Audenaert K. Impact of ethnic pre-harvest practices on the occurrence of Fusarium verticillioides and fumonisin B1 in maize fields from Vietnam. Food Control 2021. [DOI: 10.1016/j.foodcont.2020.107567] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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9
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Anal AK, Perpetuini G, Petchkongkaew A, Tan R, Avallone S, Tofalo R, Nguyen HV, Chu-Ky S, Ho PH, Phan TT, Waché Y. Food safety risks in traditional fermented food from South-East Asia. Food Control 2020. [DOI: 10.1016/j.foodcont.2019.106922] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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10
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Drott MT, Fessler LM, Milgroom MG. Population Subdivision and the Frequency of Aflatoxigenic Isolates in Aspergillus flavus in the United States. PHYTOPATHOLOGY 2019; 109:878-886. [PMID: 30480472 DOI: 10.1094/phyto-07-18-0263-r] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Consumption of food contaminated with aflatoxin, from crops infected by Aspergillus flavus, is associated with acute toxicosis, cancer, and stunted growth. Although such contamination is more common in the lower latitudes of the United States, it is unclear whether this pattern is associated with differences in the relative frequencies of aflatoxigenic individuals of A. flavus. To determine whether the frequency of the aflatoxin-producing ability of A. flavus increases as latitude decreases, we sampled 281 isolates from field soils in two north-south transects in the United States and tested them for aflatoxin production. We also genotyped 161 isolates using 10 microsatellite markers to assess population structure. Although the population density of A. flavus was highest at lower latitudes, there was no difference in the frequency of aflatoxigenic A. flavus isolates in relation to latitude. We found that the U.S. population of A. flavus is subdivided into two genetically differentiated subpopulations that are not associated with the chemotype or geographic origin of the isolates. The two populations differ markedly in allelic and genotypic diversity. The less diverse population is more abundant and may represent a clonal lineage derived from the more diverse population. Overall, increased aflatoxin contamination in lower latitudes may be explained partially by differences in the population density of A. flavus, not genetic population structure.
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Affiliation(s)
- Milton T Drott
- Plant Pathology and Plant-Microbe Biology Section, School of Integrative Plant Science, Cornell University, Ithaca, NY 14853
| | - Lauren M Fessler
- Plant Pathology and Plant-Microbe Biology Section, School of Integrative Plant Science, Cornell University, Ithaca, NY 14853
| | - Michael G Milgroom
- Plant Pathology and Plant-Microbe Biology Section, School of Integrative Plant Science, Cornell University, Ithaca, NY 14853
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Borg B, Mihrshahi S, Griffin M, Sok D, Chhoun C, Laillou A, Berger J, Wieringa FT. Randomised controlled trial to test the effectiveness of a locally-produced ready-to-use supplementary food (RUSF) in preventing growth faltering and improving micronutrient status for children under two years in Cambodia: a study protocol. Nutr J 2018; 17:39. [PMID: 29548287 PMCID: PMC5857085 DOI: 10.1186/s12937-018-0346-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2017] [Accepted: 03/01/2018] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Existing ready-to-use supplementary and therapeutic foods (RUSFs and RUTFs) have had limited acceptance and effectiveness in Cambodia. This has hampered the treatment and prevention of child malnutrition. An innovative, locally produced, multiple micronutrient fortified lipid-based nutrient supplement (LNS) has been developed for use as an RUSF. Unlike most RUSFs, which contain milk, this product contains fish as the animal protein. Few RUSFs have been formulated using non-milk animal-source foods and they have not been widely tested. An acceptability trial that was conducted on this novel RUSF in June 2015 demonstrated that children will eat the RUSF and that caregivers will feed it to their children. The current trial aims to evaluate the effectiveness of the RUSF in preventing growth faltering and improving micronutrient status in Cambodian children. METHODS AND ANALYSIS This trial is a six-month, prospective, cluster randomised, non-blinded controlled trial among infants in peri-urban Phnom Penh. The trial aims to establish the superiority of the novel RUSF, compared to three alternatives (Corn-Soy Blend Plus Plus (CSB++) and Sprinkles micronutrient powders as active comparators, and the unimproved diet as a control). The allocation ratio is 1:1. Healthy children (N = 540) aged six to eleven months will be recruited. Data will be collected at baseline, and monthly thereafter for a period of six months. Participants will be provided with a monthly supply of the food to which their village has been allocated. DISCUSSION There is an urgent need to develop locally produced and culturally acceptable RUSFs, and to compare these with existing options in terms of their potential for preventing malnutrition, in Cambodia and elsewhere. This trial will contribute much-needed data on the effectiveness of supplementary foods with an animal-source food other than milk, by comparing a novel RUSF based on fish to one that uses milk (CSB++). Moreover, it will deepen the understanding of the impact of multiple micronutrients provided with or without macronutrients, by comparing the novel RUSF and CSB++, which combine macronutrients with multiple micronutrients, to Sprinkles, which contains no macronutrients. In addition, it will augment the body of evidence from Asia. TRIAL REGISTRATION ClinicalTrials.gov, Identifier: LNS-CAMB-INFANTS-EFF; NCT02257762 .
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Affiliation(s)
- Bindi Borg
- School of Public Health, Faculty of Medicine, University of Sydney, Sydney, Australia. .,c/o Pascal Marino, European Union Delegation in Cameroon, BP, 847, Yaoundé, Cameroon.
| | - Seema Mihrshahi
- School of Public Health, Faculty of Medicine, University of Sydney, Sydney, Australia
| | - Mark Griffin
- School of Public Health, University of Queensland, Brisbane, Australia
| | - Daream Sok
- Department of Nutrition, Exercise and Sports, Faculty of Science, University of Copenhagen, Copenhagen, Denmark.,Department of Fisheries Post-Harvest Technologies and Quality Control, Fisheries Administration, Ministry of Agriculture, Forestry and Fisheries, Phnom Penh, Cambodia
| | - Chamnan Chhoun
- Department of Fisheries Post-Harvest Technologies and Quality Control, Fisheries Administration, Ministry of Agriculture, Forestry and Fisheries, Phnom Penh, Cambodia
| | - Arnaud Laillou
- Child Survival and Development Section, UNICEF, Phnom Penh, Cambodia
| | - Jacques Berger
- UMR Nutripass, Institut de Recherche pour le Développement, IRD/UM/SupAgro, Montpellier, France
| | - Frank T Wieringa
- UMR Nutripass, Institut de Recherche pour le Développement, IRD/UM/SupAgro, Montpellier, France
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Distribution and incidence of atoxigenic Aspergillus flavus VCG in tree crop orchards in California: A strategy for identifying potential antagonists, the example of almonds. Int J Food Microbiol 2017; 265:55-64. [PMID: 29127811 DOI: 10.1016/j.ijfoodmicro.2017.10.023] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2017] [Revised: 09/15/2017] [Accepted: 10/20/2017] [Indexed: 11/21/2022]
Abstract
To identify predominant isolates for potential use as biocontrol agents, Aspergillus flavus isolates collected from soils of almond, pistachio and fig orchard in the Central Valley of California were tested for their membership to 16 atoxigenic vegetative compatibility groups (VCGs), including YV36, the VCG to which AF36, an atoxigenic isolate commercialized in the United States as biopesticide, belongs. A surprisingly large proportion of isolates belonged to YV36 (13.3%, 7.2% and 6.6% of the total almond, pistachio and fig populations, respectively), while the percentage of isolates belonging to the other 15 VCGs ranged from 0% to 2.3%. In order to gain a better insight into the structure and diversity of atoxigenic A. flavus populations and to further identify predominant isolates, seventeen SSR markers were then used to genetically characterize AF36, the 15 type-isolates of the VCGs and 342 atoxigenic isolates of the almond population. There was considerable genetic diversity among isolates with a lack of differentiation among micro-geographical regions or years. Since isolates sharing identical SSR profiles from distinct orchards were rare, we separated them into groups of at least 3 closely-related isolates from distinct orchards that shared identical alleles for at least 15 out of the 17 loci. This led to the identification of 15 groups comprising up to 24 closely-related isolates. The group which contained the largest number of isolates were members of YV36 while five groups were also found to be members of our studied atoxigenic VCGs. These results suggest that these 15 groups, and AF36 in particular, are well adapted to various environmental conditions in California and to tree crops and, as such, are good candidates for use as biocontrol agents.
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Borg B, Mihrshahi S, Griffin M, Chamnan C, Laillou A, Wieringa FT. Crossover trial to test the acceptability of a locally produced lipid-based nutrient supplement (LNS) for children under 2 years in Cambodia: a study protocol. BMJ Open 2017; 7:e015958. [PMID: 28882910 PMCID: PMC5588973 DOI: 10.1136/bmjopen-2017-015958] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Abstract
INTRODUCTION The acceptability and efficacy of existing ready-to-use supplementary and therapeutic foods has been low in Cambodia, thus limiting success in preventing and treating malnutrition among Cambodian children. In that context, UNICEF and IRD have developed a locally produced, multiple micronutrient fortified lipid-based nutrient supplement. This food is innovative, in that it uses fish instead of milk as the animal source food. Very few supplementary foods have non-milk animal source foods, and in addition they have not been widely tested. This trial will assess the novel food's acceptability to children and caregivers. METHODS AND ANALYSIS This is a cluster-randomised, incomplete block, 4×4 crossover design with no blinding. It will take place in four sites in a community setting in periurban Phnom Penh. Healthy children aged 9-23 months (n=100) will eat each of four foods for 3 days at a time. The amount they consume will be measured, and at the end of each 3-day set, caregivers will assess how well their child liked the food. After 12 days, caregivers themselves will do a sensory test of the 4 foods and will rank them in terms of preference. ETHICS AND DISSEMINATION Ethical clearance was received from the University of Queensland Medical Research Ethics Committee (2014001070) and from Cambodia's National Ethics Committee for Health Research (03/8 NECHR). REGISTRATION ClinicalTrials.gov, identifier: LNS-CAMB-INFANTS; NCT02257437. Pre-results.
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Affiliation(s)
- Bindi Borg
- School of Public Health, University of Sydney, Sydney, New South Wales, Australia
| | - Seema Mihrshahi
- School of Public Health, University of Sydney, Sydney, New South Wales, Australia
| | - Mark Griffin
- School of Public Health, University of Queensland, Brisbane, Queensland, Australia
| | - Chhoun Chamnan
- DFPTQ, Fisheries Administration, Ministry of Agriculture, Forestry and Fisheries, Phnom Penh, Cambodia
| | | | - Frank T Wieringa
- UMR-204 Nutripass, Institut de Recherche pour le Développement, IRD/UM/SupAgro, Montpellier, France
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Zhang C, Selvaraj JN, Yang Q, Liu Y. A Survey of Aflatoxin-Producing Aspergillus sp. from Peanut Field Soils in Four Agroecological Zones of China. Toxins (Basel) 2017; 9:E40. [PMID: 28117685 PMCID: PMC5308272 DOI: 10.3390/toxins9010040] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2016] [Revised: 01/05/2017] [Accepted: 01/06/2017] [Indexed: 11/20/2022] Open
Abstract
Peanut pods are easily infected by aflatoxin-producing Aspergillus sp.ecies from field soil. To assess the aflatoxin-producing Aspergillus sp. in different peanut field soils, 344 aflatoxin-producing Aspergillus strains were isolated from 600 soil samples of four agroecological zones in China (the Southeast coastal zone (SEC), the Yangtze River zone (YZR), the Yellow River zone (YR) and the Northeast zone (NE)). Nearly 94.2% (324/344) of strains were A. flavus and 5.8% (20/344) of strains were A. parasiticus. YZR had the highest population density of Aspergillus sp. and positive rate of aflatoxin production in isolated strains (1039.3 cfu·g-1, 80.7%), the second was SEC (191.5 cfu·g-1, 48.7%), the third was YR (26.5 cfu·g-1, 22.7%), and the last was NE (2.4 cfu·g-1, 6.6%). The highest risk of AFB₁ contamination on peanut was in YZR which had the largest number of AFB₁ producing isolates in 1g soil, followed by SEC and YR, and the lowest was NE. The potential risk of AFB₁ contamination in peanuts can increase with increasing population density and a positive rate of aflatoxin-producing Aspergillus sp. in field soils, suggesting that reducing aflatoxigenic Aspergillus sp. in field soils could prevent AFB₁ contamination in peanuts.
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Affiliation(s)
- Chushu Zhang
- Institute of Food Science and Technology, Chinese Academy of Agricultural Sciences/Key Laboratory of Agro-Products Processing, Ministry of Agriculture, Beijing 100193, China.
- Shandong Peanut Research Institute, Qingdao 266100, China.
| | - Jonathan Nimal Selvaraj
- Institute of Food Science and Technology, Chinese Academy of Agricultural Sciences/Key Laboratory of Agro-Products Processing, Ministry of Agriculture, Beijing 100193, China.
| | - Qingli Yang
- Qingdao Agricultural University, Qingdao 266109, China.
| | - Yang Liu
- Institute of Food Science and Technology, Chinese Academy of Agricultural Sciences/Key Laboratory of Agro-Products Processing, Ministry of Agriculture, Beijing 100193, China.
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Isolation and identification of toxigenic fungi from infected peanuts and efficacy of silver nanoparticles against them. Food Control 2017. [DOI: 10.1016/j.foodcont.2016.06.036] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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16
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Bui VN, Nguyen TTH, Mai CT, Bettarel Y, Hoang TY, Trinh TTL, Truong NH, Chu HH, Nguyen VTT, Nguyen HD, Wölfl S. Procarcinogens - Determination and Evaluation by Yeast-Based Biosensor Transformed with Plasmids Incorporating RAD54 Reporter Construct and Cytochrome P450 Genes. PLoS One 2016; 11:e0168721. [PMID: 28006013 PMCID: PMC5179006 DOI: 10.1371/journal.pone.0168721] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2016] [Accepted: 12/01/2016] [Indexed: 12/31/2022] Open
Abstract
In Vietnam, a great number of toxic substances, including carcinogens and procarcinogens, from industrial and agricultural activities, food production, and healthcare services are daily released into the environment. In the present study, we report the development of novel yeast-based biosensor systems to determine both genotoxic carcinogens and procarcinogens by cotransformation with two plasmids. One plasmid is carrying human CPR and CYP (CYP3A4, CYP2B6, or CYP2D6) genes, while the other contains the RAD54-GFP reporter construct. The three resulting coexpression systems bearing both CPR-CYP and RAD54-GFP expression cassettes were designated as CYP3A4/CYP2B6/CYP2D6 + RAD54 systems, respectively and used to detect and evaluate the genotoxic potential of carcinogens and procarcinogens by selective activation and induction of both CPR-CYP and RAD54-GFP expression cassettes in response to DNA damage. Procarcinogens were shown to be predominantly, moderately or not bioactivated by one of the CYP enzymes and thus selectively detected by the specific coexpression system. Aflatoxin B1 and benzo(a)pyrene were predominantly detected by the CYP3A4 + RAD54 system, while N-nitrosodimethylamine only moderately activated the CYP2B6 + RAD54 reporter system and none of them was identified by the CYP2D6 + RAD54 system. In contrast, the genotoxic carcinogen, methyl methanesulfonate, was detected by all systems. Our yeast-reporter system can be performed in 384-well microplates to provide efficient genotoxicity testing to identify various carcinogenic compounds and reduce chemical consumption to about 53% as compared with existing 96-well genotoxicity bioassays. In association with a liquid handling robot, this platform enables rapid, cost-effective, and high-throughput screening of numerous analytes in a fully automated and continuous manner without the need for user interaction.
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Affiliation(s)
- Van Ngoc Bui
- National Key Laboratory of Gene Technology, Institute of Biotechnology (IBT), Vietnam Academy of Science and Technology (VAST), Hanoi, Vietnam
- Institute of Pharmacy and Molecular Biotechnology (IPMB), Heidelberg University, Heidelberg, Germany
| | - Thi Thu Huyen Nguyen
- Thai Nguyen University of Sciences, Thai Nguyen University, Thai Nguyen, Vietnam
| | - Chi Thanh Mai
- National Key Laboratory of Gene Technology, Institute of Biotechnology (IBT), Vietnam Academy of Science and Technology (VAST), Hanoi, Vietnam
| | - Yvan Bettarel
- Institute of Research for Development (IRD), UMR MARBEC, Montpellier, France
| | - Thi Yen Hoang
- National Key Laboratory of Gene Technology, Institute of Biotechnology (IBT), Vietnam Academy of Science and Technology (VAST), Hanoi, Vietnam
| | - Thi Thuy Linh Trinh
- National Key Laboratory of Gene Technology, Institute of Biotechnology (IBT), Vietnam Academy of Science and Technology (VAST), Hanoi, Vietnam
| | - Nam Hai Truong
- National Key Laboratory of Gene Technology, Institute of Biotechnology (IBT), Vietnam Academy of Science and Technology (VAST), Hanoi, Vietnam
| | - Hoang Ha Chu
- National Key Laboratory of Gene Technology, Institute of Biotechnology (IBT), Vietnam Academy of Science and Technology (VAST), Hanoi, Vietnam
| | | | - Huu Duc Nguyen
- Vietnam National University of Agriculture, Hanoi, Vietnam
| | - Stefan Wölfl
- Institute of Pharmacy and Molecular Biotechnology (IPMB), Heidelberg University, Heidelberg, Germany
- * E-mail:
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Alruqaie I, Al-Ghamidi F. Sensory and nutritional attributes of samh flour and dates powder supplemented cookies. QUALITY ASSURANCE AND SAFETY OF CROPS & FOODS 2015. [DOI: 10.3920/qas2013.0350] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Affiliation(s)
- I.M. Alruqaie
- King Abdul-Aziz City for Science and Technology (KACST), National Center for Agriculture Technology (NCAT), P.O. Box 6086, Riyadh 11442, Saudi Arabia
| | - F.A. Al-Ghamidi
- Nutrition and Food Science Department, Faculty of Home Economics, Princess Nora bint Abdul-Rahman University, Riyadh, Saudi Arabia
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Trinh H, Anh D, Thong P, Hue N. A simple PCR for detection of Aspergillus flavus in infected food. QUALITY ASSURANCE AND SAFETY OF CROPS & FOODS 2015. [DOI: 10.3920/qas2013.0308] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Affiliation(s)
- H.L.T. Trinh
- School of Biotechnology, International University - Vietnam National University in HCMC, block 6, Linh Trung Ward, Thu Duc District, 70000 Ho Chi Minh, Vietnam
| | - D.T. Anh
- School of Biotechnology, International University - Vietnam National University in HCMC, block 6, Linh Trung Ward, Thu Duc District, 70000 Ho Chi Minh, Vietnam
| | - P.M. Thong
- School of Biotechnology, International University - Vietnam National University in HCMC, block 6, Linh Trung Ward, Thu Duc District, 70000 Ho Chi Minh, Vietnam
| | - N.T. Hue
- School of Biotechnology, International University - Vietnam National University in HCMC, block 6, Linh Trung Ward, Thu Duc District, 70000 Ho Chi Minh, Vietnam
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Dehghan P, Bui T, Campbell LT, Lai YW, Tran-Dinh N, Zaini F, Carter DA. Multilocus variable-number tandem-repeat analysis of clinical isolates of Aspergillus flavus from Iran reveals the first cases of Aspergillus minisclerotigenes associated with human infection. BMC Infect Dis 2014; 14:358. [PMID: 24986045 PMCID: PMC4099206 DOI: 10.1186/1471-2334-14-358] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2013] [Accepted: 06/18/2014] [Indexed: 11/10/2022] Open
Abstract
Background Aspergillus flavus is intensively studied for its role in infecting crop plants and contaminating produce with aflatoxin, but its role as a human pathogen is less well understood. In parts of the Middle East and India, A. flavus surpasses A. fumigatus as a cause of invasive aspergillosis and is a significant cause of cutaneous, sinus, nasal and nail infections. Methods A collection of 45 clinical and 10 environmental A. flavus isolates from Iran were analysed using Variable-Number Tandem-Repeat (VNTR) markers with MICROSAT and goeBURST to determine their genetic diversity and their relatedness to clinical and environmental A. flavus isolates from Australia. Phylogeny was assessed using partial β-tubulin and calmodulin gene sequencing, and mating type was determined by PCR. Antifungal susceptibility testing was performed on selected isolates using a reference microbroth dilution method. Results There was considerable diversity in the A. flavus collection, with no segregation on goeBURST networks according to source or geographic location. Three Iranian isolates, two from sinus infections and one from a paranasal infection grouped with Aspergillus minisclerotigenes, and all produced B and G aflatoxin. Phylogenic analysis using partial β-tubulin and calmodulin sequencing confirmed two of these as A. minisclerotigenes, while the third could not be differentiated from A. flavus and related species within Aspergillus section flavi. Based on epidemiological cut-off values, the A. minisclerotigens and A. flavus isolates tested were susceptible to commonly used antifungal drugs. Conclusions This is the first report of human infection due to A. minisclerotigenes, and it raises the possiblity that other species within Aspergillus section flavi may also cause clinical disease. Clinical isolates of A. flavus from Iran are not distinct from Australian isolates, indicating local environmental, climatic or host features, rather than fungal features, govern the high incidence of A. flavus infection in this region. The results of this study have important implications for biological control strategies that aim to reduce aflatoxin by the introduction of non-toxigenic strains, as potentially any strain of A. flavus, and closely related species like A. minisclerotigenes, might be capable of human infection.
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Affiliation(s)
| | | | | | | | | | | | - Dee A Carter
- School of Molecular Bioscience, The University of Sydney, Sydney, NSW, Australia.
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Garber NP, Cotty PJ. Aspergillus parasiticus communities associated with sugarcane in the Rio Grande Valley of Texas: implications of global transport and host association within Aspergillus section Flavi. PHYTOPATHOLOGY 2014; 104:462-471. [PMID: 24224872 DOI: 10.1094/phyto-04-13-0108-r] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
In the Rio Grande Valley of Texas (RGV), values of maize and cottonseed crops are significantly reduced by aflatoxin contamination. Aflatoxin contamination of susceptible crops is the product of communities of aflatoxin producers and the average aflatoxin-producing potentials of these communities influence aflatoxin contamination risk. Cropping pattern influences community composition and, thereby, the epidemiology of aflatoxin contamination. In 2004, Aspergillus parasiticus was isolated from two fields previously cropped to sugarcane but not from 23 fields without recent history of sugarcane cultivation. In 2004 and 2005, A. parasiticus composed 18 to 36% of Aspergillus section Flavi resident in agricultural soils within sugarcane-producing counties. A. parasiticus was not detected in counties that do not produce sugarcane. Aspergillus section Flavi soil communities within sugarcane-producing counties differed significantly dependent on sugarcane cropping history. Fields cropped to sugarcane within the previous 5 years had greater quantities of A. parasiticus (mean = 16 CFU/g) than fields not cropped to sugarcane (mean = 0.1 CFU/g). The percentage of Aspergillus section Flavi composed of A. parasiticus increased to 65% under continuous sugarcane cultivation and remained high the first season of rotation out of sugarcane. Section Flavi communities in fields rotated to non-sugarcane crops for 3 to 5 years were composed of <5% A. parasiticus, and fields with no sugarcane history averaged only 0.2% A. parasiticus. The section Flavi community infecting RGV sugarcane stems ranged from 95% A. parasiticus in billets prepared for commercial planting to 52% A. parasiticus in hand-collected sugarcane stems. Vegetative compatibility assays and multilocus phylogenies verified that aflatoxin contamination of raw sugar was previously attributed to similar A. parasiticus in Japan. Association of closely related A. parasiticus genotypes with sugarcane produced in Japan and RGV, frequent infection of billets by these genotypes, and the ephemeral nature of A. parasiticus in RGV soils suggests global transport with sugarcane planting material.
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Optimising the number of isolates to be used to estimate growth parameters of mycotoxigenic species. Food Microbiol 2012; 32:235-42. [DOI: 10.1016/j.fm.2012.06.005] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2012] [Revised: 06/17/2012] [Accepted: 06/19/2012] [Indexed: 11/20/2022]
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Amani S, Shams-Ghahfarokhi M, Banasaz M, Razzaghi-Abyaneh M. Mycotoxin-producing ability and chemotype diversity of Aspergillus section flavi from soils of peanut-growing regions in iran. Indian J Microbiol 2012; 52:551-6. [PMID: 24293709 DOI: 10.1007/s12088-012-0275-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2012] [Accepted: 05/05/2012] [Indexed: 10/28/2022] Open
Abstract
Invasion of crops with Aspergillus flavus may result in contamination of food and feed with carcinogenic mycotoxins such as aflatoxins (AF) and cyclopiazonic acid (CPA). In the present study, distribution and toxigenicity of Aspergillus flavus and A. parasiticus in soils of five peanut fields located in Guilan province, Northern Iran was investigated. From a total of 30 soil samples, 53 strains were isolated which all of them were finally identified as A. flavus by a combination of colony morphology, microscopic criteria and mycotoxin profiles. Chromatographic analysis of fungal cultures on yeast extract sucrose broth by tip culture method showed that 45 of the 53 A. flavus isolates (84.9 %) were able to produce either CPA or AFB1, while eight of the isolates (15.1 %) were non-toxigenic. The amounts of CPA and AFB1 produced by the isolates were reported in the range of 18.2-403.8 μg/g and 53.3-7446.3 μg/g fungal dry weights, respectively. Chemotype classification of A. flavus isolates based on the ability for producing mycotoxins and sclerotia showed that 43.4 % were producers of CPA, AFB1 and sclerotia (group I), 13.2 % of CPA and AFB1 (group II), 9.4 % of AFB1 and sclerotia (group III), 13.2 % of AFB1 (group IV), 5.7 % of CPA and sclerotia (group V) and 15.1 % were non-toxigenic with no sclerotia (group VI). No strain was found as producer of only CPA or sclerotia. These results indicate different populations of mycotoxigenic A. flavus strains enable to produce hazardous amounts of AFB1 and CPA are present in peanuts field soils which can be quite important regard to their potential to contaminate peanuts as a main crop consumed in human and animal nutrition.
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Affiliation(s)
- S Amani
- Department of Mycology, Faculty of Medical Sciences, Tarbiat Modares University, 14115-331 Tehran, Iran
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Reis GM, Rocha LDO, Atayde DD, Batatinha MM, Corrêa B. Molecular characterization by amplified fragment length polymorphism and aflatoxin production of Aspergillus flavus isolated from freshly harvested peanut in Brazil. WORLD MYCOTOXIN J 2012. [DOI: 10.3920/wmj2011.1350] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Brazil contributes substantially to the global peanut production, and the state of São Paulo is the largest producer in the country. Peanut crops can be contaminated by Aspergillus flavus strains producing aflatoxins, which are highly toxic and carcinogenic. Thus, the production of high-quality peanuts is crucial both for the commercial peanut industry and as a matter of public health. In this study, we used amplified fragment length polymorphism analysis (AFLP) to investigate the genetic variability among A. flavus strains isolated from fresh peanuts harvested in four different regions in the state of São Paulo, and to determine whether the molecular genetic profiles correlated with aflatoxin production or sclerotia formation. AFLP analysis generated 78 fragments ranging from 27 to 365 base pairs in length. Thirteen percent were not polymorphic. Genotyping identified twelve groups of A. flavus. On the basis of the polymorphisms identified, similarity between the isolates ranged from 37% to 100%. Of all isolates collected, 91.7% produced aflatoxins and 83.9% produced small sclerotia. Statistical analysis failed to suggest any relationship between the presence of sclerotia and mean levels of aflatoxins B1 and B2. Furthermore, a dendrogram based on AFLP data revealed substantial genetic variability among the A. flavus strains, but showed no correlation between dendrogram groups separated by molecular genetic features and production of aflatoxins B1 or B2 or the formation of sclerotia.
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Affiliation(s)
- G. Martins Reis
- Department of Microbiology, Biomedical Sciences Institute, University of São Paulo, Av. Prof. Lineu Prestes 1374, lab. 249, Cidade Universitária, 05508-000 São Paulo, Brazil
| | - L. de Oliveira Rocha
- Department of Microbiology, Biomedical Sciences Institute, University of São Paulo, Av. Prof. Lineu Prestes 1374, lab. 249, Cidade Universitária, 05508-000 São Paulo, Brazil
| | - D. Diniz Atayde
- Department of Microbiology, Biomedical Sciences Institute, University of São Paulo, Av. Prof. Lineu Prestes 1374, lab. 249, Cidade Universitária, 05508-000 São Paulo, Brazil
| | - M.J. Moreira Batatinha
- Department of Pathology, School of Veterinary Medicine, Federal University of Bahia, Salvador, Av. Ademar de Barros, n. 500, 40110-170 Ondina, Ba, Brazil
| | - B. Corrêa
- Department of Microbiology, Biomedical Sciences Institute, University of São Paulo, Av. Prof. Lineu Prestes 1374, lab. 249, Cidade Universitária, 05508-000 São Paulo, Brazil
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Barberis CL, Dalcero AM, Magnoli CE. Evaluation of aflatoxin B1 and ochratoxin A in interacting mixed cultures of Aspergillus sections Flavi and Nigri on peanut grains. Mycotoxin Res 2012; 28:149-56. [DOI: 10.1007/s12550-012-0126-y] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2011] [Revised: 02/08/2012] [Accepted: 02/09/2012] [Indexed: 11/29/2022]
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25
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An insight into the distribution, genetic diversity, and mycotoxin production of Aspergillus section Flavi in soils of pistachio orchards. Folia Microbiol (Praha) 2011; 57:27-36. [DOI: 10.1007/s12223-011-0090-5] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2011] [Accepted: 11/23/2011] [Indexed: 10/14/2022]
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26
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A survey on distribution and toxigenicity of Aspergillus flavus from indoor and outdoor hospital environments. Folia Microbiol (Praha) 2011; 56:527-34. [DOI: 10.1007/s12223-011-0078-1] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2011] [Accepted: 10/13/2011] [Indexed: 10/15/2022]
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