Species composition of and fumonisin production by the Fusarium fujikuroi species complex isolated from Korean cereals
- Authors
- Choi, Jung-Hye; Lee, Seolhee; Nah, Ju-Young; Kim, Hee-Kyoung; Paek, Ji-Seon; Lee, Soohyung; Ham, Hyeonheui; Hong, Sung Kee; Yun, Sung-Hwan; Lee, Theresa
- Issue Date
- 21-Feb-2018
- Publisher
- Elsevier BV
- Keywords
- Fusarium fujikuroi species complex; Fumonisin; Cereal; F. fujikuroi
- Citation
- International Journal of Food Microbiology, v.267, pp 62 - 69
- Pages
- 8
- Journal Title
- International Journal of Food Microbiology
- Volume
- 267
- Start Page
- 62
- End Page
- 69
- URI
- https://scholarworks.bwise.kr/sch/handle/2021.sw.sch/6207
- DOI
- 10.1016/j.ijfoodmicro.2017.12.006
- ISSN
- 0168-1605
1879-3460
- Abstract
- To assess the risk of fumonisin contamination in Korean cereals, we isolated colonies of the Fusarium fujikuroi species complex (FFSC) from barley, maize, rice and soybean samples from 2011 to 2015. A total of 878 FFSC strains were isolated mostly from maize and rice, and species identity of the isolates were determined using the DNA sequence of the translation elongation factor 1-alpha (TEF-1 alpha) and RNA polymerase II (RPB2) genes. Fusaria recovered from Korean cereals included F. fujikuroi (317 isolates and a frequency of 36%), F. proliferatum (212 isolates and 24.1%), F. verticillioides (170 isolates and 19.4%), F. concentricum (86 strains and 9.8%), F. andiyazi (56 isolates and 6.4%), F. subglutinans (28 isolates and 3.2%), F. thapsinum (5 isolates and 0.6%), and F. circinatum (2 isolates and 0.2%). The rice samples were dominated by F. fujikuroi (47.4%), F. proliferatum (27.3%), and F. concentricum (15.1%), whereas maize samples were dominated by F. verticillioides (33.9%), F. fujikuroi (25.3%), and F. proliferatum (21.1%). A phylogenetic analysis of 70 representative isolates demonstrated that each species was resolved as genealogically exclusive in the ML tree. Fumonisin production potential was evaluated using a PCR assay for the fumonisin biosynthesis gene, FUM1 in all of the isolates. Most of the isolates tested (94%) were positive for FUM1. All of the isolates assigned to F. fujikuroi, F. proliferatum, F. verticillioides and F. thapsinum were positive for FUM1 irrespective of their host origin. Seventy-seven representative isolates positive for FUM1 were examined for fumonisin production in rice medium. The majority of F. proliferatum (26/27, 96.3%), F. verticillioides (16/17, 94.1%) and F. fujikuroi (19/25, 76.0%) produced both FB1 and FB2. Notably, 16 of 19 fumonisin-producing F. fujikuroi produced > 1000 mu g/g of fumonisins (FB1 + FB2) in rice medium, which is higher than that in previous reports. These results suggest that F. fujikuroi can produce high levels of fumonisins similar to F. verticillioides and F. protiferatum.
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