Interacting climate change environmental factors effects on Fusarium langsethiae growth, expression of Tri genes and T-2/HT-2 mycotoxin production on oat-based media and in stored oats

被引:31
作者
Verheecke-Vaessen, Carol [1 ]
Diez-Gutierrez, Lucia [1 ,3 ]
Renaud, Justin [2 ]
Sumarah, Mark [2 ]
Medina, Angel [1 ]
Magan, Naresh [1 ]
机构
[1] Cranfield Univ, Appl Mycol Grp, Environm & AgriFood Theme, Cranfield MK43 0AL, Beds, England
[2] Agr & Agri Food Canada, London Res & Dev Ctr, London, ON N5V 4T3, Canada
[3] TECNALIA Res & Innovat, Hlth Div, Hlth & Food Area, Minano, Alava, Spain
基金
英国生物技术与生命科学研究理事会;
关键词
Biosynthetic genes; Carbon dioxide; Mycotoxins; Small grain cereals; Temperature; Type A trichothecenes; HT-2; TOXIN; OCHRATOXIN; DEOXYNIVALENOL; CONTAMINATION; BIOSYNTHESIS; T-2;
D O I
10.1016/j.funbio.2019.04.008
中图分类号
Q93 [微生物学];
学科分类号
071005 ; 100705 ;
摘要
This study examined the effect of climate change (CC) abiotic factors of temperature (20, 25, 30 degrees C), water activity (a(w); 0.995, 0.98) and CO2 exposure (400, 1000 ppm) may have on (a) growth, (b) gene expression of biosynthetic toxin genes (Tri5, Tri6, Tril6), and (c) T-2/HT-2 toxins and associated metabolites by Fusarium langsethiae on oat-based media and in stored oats. Lag phases and growth were optimum at 25 degrees C with freely available water. This was significantly reduced at 30 degrees C, at 0.98 a(w) and 1000 ppm CO2 exposure. In oat-based media and stored oats, Tri5 gene expression was reduced in all conditions except 30 degrees C, 0.98 a(w), elevated CO2 where there was a significant (5.3-fold) increase. The Tri6 and Tril6 genes were upregulated, especially in elevated CO2 conditions. Toxin production was higher at 25 degrees C than 30 degrees C. In stored oats, at 0.98 a(w), elevated CO2 led to a significant increase (73-fold) increase in T2/HT-2 toxin, especially at 30 degrees C. Nine T-2 and HT-2 related metabolites were detected, including a new dehydro T-2 toxin (which correlated with T-2 production) and the conjugate, HT-2 toxin, glucuronide. This shows that CC factors may have a significant impact on growth and mycotoxin production by E langsethiae. (C) 2019 Published by Elsevier Ltd on behalf of British Mycological Society.
引用
收藏
页码:618 / 624
页数:7
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