Document Detail

Influence of carbon source on growth and mycotoxin production by isolates of Pyrenophora tritici-repentis from wheat.
MedLine Citation:
PMID:  20962911     Owner:  NLM     Status:  MEDLINE    
The fungus Pyrenophora tritici-repentis can infect wheat kernels, causing red smudge, and has been shown to produce the anthraquinone mycotoxins emodin, catenarin, and islandicin. The growth of 8 fungal isolates from diverse regions was evaluated on various culture media and was found to be generally slowest on the semisynthetic Fries medium. The choice of carbon source had a significant effect on mycotoxin production, as assessed by high-performance liquid chromatography. The highest emodin concentration (194.18 ± 16.26 µg/g medium) was observed for isolate Alg 3-24 on Fries medium supplemented with fructose, while the highest catenarin concentration (302.54 ±13.92 µg/g medium) was observed for TS93-71B on Fries medium supplemented with starch. Islandicin was not produced by any isolate under the conditions tested. Evaluation of the dynamics of mycotoxin production by isolate 331-2 on V8-potato dextrose agar medium revealed a rapid accumulation of emodin and catenarin during the first week of incubation, followed by a large decline by 14 days. Differences in the growth of and mycotoxin production by isolates of P. tritici-repentis likely resulted from the differential composition of the media and (or) intraspecies variability. Accordingly, the optimization of growth medium should be considered when evaluating the potential of specific isolates for mycotoxin production.
Noureddine Bouras; Stephen E Strelkov
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Canadian journal of microbiology     Volume:  56     ISSN:  1480-3275     ISO Abbreviation:  Can. J. Microbiol.     Publication Date:  2010 Oct 
Date Detail:
Created Date:  2010-10-21     Completed Date:  2010-12-17     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0372707     Medline TA:  Can J Microbiol     Country:  Canada    
Other Details:
Languages:  eng     Pagination:  874-84     Citation Subset:  IM    
Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, AB, Canada.
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MeSH Terms
Anthraquinones / metabolism
Ascomycota / growth & development*,  metabolism*
Carbohydrate Metabolism
Carbon / metabolism*
Emodin / metabolism
Food Handling
Food Microbiology
Fungal Proteins / biosynthesis
Mycotoxins / biosynthesis*,  pharmacology
Plant Diseases / microbiology
Triticum / microbiology*
Reg. No./Substance:
0/Anthraquinones; 0/Fungal Proteins; 0/Mycotoxins; 476-56-2/funiculosin (anthraquinone); 518-82-1/Emodin; 7440-44-0/Carbon; 7732-18-5/Water

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