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International Journal of Food Microbiology Mycotoxins Produced by Fusarium Proliferatum and F. Pseudonygamai on Maize, Sorghum A

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International Journal of Food Microbiology Mycotoxins Produced by Fusarium Proliferatum and F. Pseudonygamai on Maize, Sorghum A International Journal of Food Microbiology 296 (2019) 31–36 Contents lists available at ScienceDirect International Journal of Food Microbiology journal homepage: www.elsevier.com/locate/ijfoodmicro Short communication Mycotoxins produced by Fusarium proliferatum and F. pseudonygamai on maize, sorghum and pearl millet grains in vitro T ⁎ Hester F. Vismera, Gordon S. Shepharda, , Liana van der Westhuizenb, Pamella Mngqawaa, Vuyiswa Bushula-Njahc, John F. Leslied a Mycotoxicology and Chemoprevention Research Group, Institute of Biomedical and Microbial Biotechnology, Cape Peninsula University of Technology, PO Box 1906, Bellville 7535, South Africa b Oxidative Stress Research Centre, Institute of Biomedical and Microbial Biotechnology, Cape Peninsula University of Technology, PO Box 1906, Bellville 7535, South Africa c Forestry and Agricultural Biotechnology Institute, University of Pretoria, Private Bag X20, Hatfield 0028, South Africa d Kansas State University, 4024 Throckmorton Plant Sciences Center, 1712 Claflin Avenue, Manhattan, KS 66506-5502, USA ARTICLE INFO ABSTRACT Keywords: Maize (Zea mays), sorghum (Sorghum bicolor) and pearl millet (Pennisetum glaucum) are basic staple foods for Fumonisin many rural or poorer communities. These crops are susceptible to plant diseases caused by multiple species of Moniliformin Fusarium, some of which also produce mycotoxins, including fumonisins and moniliformin that are detrimental Fusarium to both humans and domesticated animals. Eighteen potentially toxigenic Fusarium strains were isolated from Subsistence farming maize (n = 10), sorghum (n = 7) and pearl millet (n = 1) growing in the same field in Nigeria. The 17 strains from maize and sorghum were all F. proliferatum and the one strain from pearl millet was F. pseudonygamai. Under conducive conditions, the 17 F. proliferatum strains produced fumonisins, 11 in relatively large quantities (700–17,000 mg total fumonisins, i.e.,FB1 +FB2 +FB3/kg culture material), and six at < 45 mg/kg. Ten F. proliferatum strains produced > 100 mg of moniliformin per kg culture material with a maximum of 8900 mg/kg culture material. All strains could use all grains for growth and toxin production, regardless of the host from which they were isolated. Isolates varied in the amount of toxin produced on each substrate, with toxin pro- duction a property of the strain and not the host from which the strain was recovered. However, the extent to which a toxin-producing phenotype could be altered by the grain on which the fungus was grown is consistent with subtle genetic × environment interactions that require a larger data set than the one presented here to rigorously identify. In conclusion, there is significant variation in the ability of strains of F. proliferatum to produce fumonisins and moniliformin on maize, sorghum and millet. If the amount of toxin produced on the various grains in this study reflects real-world settings, e.g., poor storage, then the consumers of these con- taminated grains could be exposed to mycotoxin levels that greatly exceed the tolerable daily intakes. 1. Introduction animal feeds worldwide, with one of these grains often serving as the primary calorie source for subsistence farmers in Africa, South Asia or The occurrence of Fusarium species on staple cereal crops and their Central and South America. ability to produce mycotoxins that have detrimental health effects for These crops are subject to fungal diseases such as stalk rots, ear rots both humans and animals make it important to evaluate their potential and grain mold, which may cause great economic losses (Frederiksen toxin production on diverse crops intended for human and animal and Odvody, 2000; Jidda, 2017; Leslie, 2003; Munkvold and White, consumption (Cendoya et al., 2017; Marasas et al., 2012; Vismer et al., 2016). Multiple species in the genus Fusarium can cause grain mold and 2004). Maize (Zea mays), sorghum (Sorghum bicolor) and pearl millet ear rots of maize, sorghum and millet. The most important species as- (Pennisetum glaucum) are staple cereal crops grown as human foods and sociated with maize are Fusarium verticillioides and F. proliferatum, Abbreviations: FB, fumonisin B mycotoxins; FB1, fumonisin B1;FB2, fumonisin B2;FB3, fumonisin B3; HPLC, high-performance liquid chromatography; MON, moniliformin; PMTDI, provisional maximum tolerable daily intake ⁎ Corresponding author. E-mail addresses: [email protected] (H.F. Vismer), [email protected] (G.S. Shephard), [email protected] (L. van der Westhuizen), [email protected] (P. Mngqawa), [email protected] (V. Bushula-Njah), jfl@ksu.edu (J.F. Leslie). https://doi.org/10.1016/j.ijfoodmicro.2019.02.016 Received 10 December 2018; Received in revised form 11 February 2019; Accepted 19 February 2019 Available online 20 February 2019 0168-1605/ © 2019 Elsevier B.V. All rights reserved. H.F. Vismer, et al. International Journal of Food Microbiology 296 (2019) 31–36 Table 1 Fumonisin production (mg/kg) by Fusarium proliferatum and F. pseudonygamai strains isolated from Nigerian grain and grown on maize, white sorghum, red sorghum and pearl millet patties. Results given as fumonisin B1, total fumonisins, and the relative amounts of fumonisins B1,B2 and B3. MRC no.a Maize White sorghum Red sorghum Pearl millet FB1 Total FB1:FB2:FB3 FB1 Total FB1:FB2:FB3 FB1 Total FB1:FB2:FB3 FB1 Total FB1:FB2:FB3 F. proliferatum isolated from maize (n = 10) 8737 16 26 100:44:19 37 46 100:14:11 7 10 100:29:14 4 5 100:25:0 8738 3 3 100:0:0 4 4 100:0:0 1 1 100:0:0 2 2 100:0:0 8739 2 2 100:0:0 2 2 100:0:0 3 3 100:0:0 nd nd 0:0:0 8740 1 1 100:0:0 ndb nd 0:0:0 1 1 100:0:0 nd nd 0:0:0 8741 1 1 100:0:0 1 1 100:0:0 1 1 100:0:0 1 1 100:0:0 8742 13,600 17,400 100:25:3 4630 6110 100:27:5 2210 2860 100:23:6 2900 3800 100:27:3 8743 1910 2580 100:28:8 1480 2170 100:32:14 2040 2880 100:32:9 1630 2200 100:27:10 8744 1310 1690 100:12:17 2440 3160 100:11:18 1690 2130 100:14:12 1800 2420 100:13:21 8745 508 694 100:31:5 1410 1760 100:20:5 1060 1350 100:22:6 1810 2300 100:23:4 8746 3060 3600 100:14:5 2510 2970 100:13:5 2470 2910 100:12:6 2750 3250 100:14:4 F. proliferatum isolated from sorghum (n =7) 8726 4040 6480 100:56:4 3450 5480 100:55:4 2850 4370 100:49:5 4000 6470 100:58:4 8727 1540 2100 100:30:6 1790 2260 100:16:10 2280 3010 100:23:8 2410 3140 100:24:7 8728 2080 3370 100:59:3 1830 2910 100:53:6 4290 6480 100:46:5 1660 2600 100:53:4 8729 2780 4020 100:42:3 3210 5070 100:55:3 3460 4840 100:36:3 4040 6100 100:48:3 8730 1530 2140 100:36:4 1880 2760 100:43:4 2560 3520 100:34:4 1890 2600 100:33:5 8731 6110 8390 100:21:16 5680 7890 100:21:18 3990 5740 100:21:23 3120 4390 100:22:19 8732 24 41 100:67:4 22 33 100:41:9 24 34 100:33:8 21 31 100:38:10 F. pseudonygamai isolated from pearl millet (n =1) 8723 2 3 100:50:0 19 27 100:32:5 29 43 100:41:7 3 5 100:33:33 F. verticillioides positive control (n =1) 826 10,300 13,600 100:25:7 5600 8100 100:32:12 5220 7550 100:31:13 6600 9090 100:29:9 a Medical Research Council (MRC) culture collection number. b nd = not detected (detection limit < 1 mg/kg). whereas with sorghum and millet diseases the most important species health threat in Europe given levels in normal diets there (Peltonen are F. thapsinum, F. proliferatum, F. andiyazi and F. pseudonygamai, and, et al., 2010), but human exposure to the toxin in subsistence diets could to a lesser extent, F. verticillioides, F. nygamai and F. napiforme (Leslie be much higher. For this reason, investigation into its production by et al., 2005; Leslie and Summerell, 2006). Fusarium species produce fungal strains isolated from African crops is important. numerous mycotoxins, including fumonisins and moniliformin that The equivalence of strains recovered from different hosts in terms of have negative health effects on both humans and domesticated animals toxin production is usually assumed. This assumption is difficult to test that consume the agricultural crops infected with these fungi (Marasas because there are other variables that can confound the comparisons et al., 2008; Nagaraj et al., 1996; Peltonen et al., 2010). such as geographic and climate differences. The group of strains in this Fumonisins have been widely studied since their discovery in 1988 study was isolated from three different hosts growing in adjacent rows (Gelderblom et al., 1988). In humans, fumonisins are considered pos- on the same farm in Nigeria (Vismer et al., 2015). Thus, neither geo- sibly carcinogenic to humans (a Group 2B carcinogen) by IARC (Ostry graphic nor climate variables are present for the origins of the strains et al., 2017), and are associated with neural tube defects in newborns used in our comparisons. Similarly, there are known differences in the (Gelineau-van Waes et al., 2009). Toxin production is subject to both amount of toxin that can be recovered from individual contaminated genetic (Proctor et al., 2004) and environmental (Marín et al., 2004) grains. There are two possible hypotheses regarding the differences. controls, with most of these studies conducted with F. verticillioides.
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