ABSTRACT Fusarium species cause yield losses in wheat production through fusarium head blight (FHB) and the associated contamination of regulated mycotoxins, such as trichothecenes and zearalenone. Despite the widespread use of PCR‐based molecular approaches for Fusarium detection, quantification, and chemotyping, most primers were developed prior to both modern phylogenetic reclassification and the availability of high‐quality genome assemblies, leaving their specificity and robustness largely untested. Existing PCR‐ and qPCR‐based assays for Fusarium detection in wheat were reviewed and re‐evaluated in silico using a curated genome panel. Of 53 species‐specific primer pairs, 14 (26.4%) achieved high‐specificity grades (A–B), whereas 25 (47.2%) were lower performing (D–E), mainly due to cross‐reactivity or inconsistent target amplification. Chemotype assays targeting TRI and ZEN genes showed stronger agreement with reported chemotypes, especially for informative TRI loci such as Tri3, Tri7, and Tri12. To support improved qPCR assay design and reporting, we propose FusaMIQE, a Fusarium‐adapted framework based on MIQE 2.0 guidelines, tailored to the specific challenges of Fusarium diagnostics in wheat. Together, this manuscript provides the first in silico assessment of PCR/qPCR primers as diagnostic tools for FHB pathogens and associated recommendations for good practice (FusaMIQE) of Fusarium diagnostics in wheat.
Kavitha Vijeandran, Alexey Larionov, C. Cervini et al.· Comprehensive Reviews in Foo...· 0 citations
With increased mycotoxin contamination, the search for eco-friendly biocontrol strategies has become increasingly important. This study aimed to evaluate the efficiency of stilbenoid-enriched Merlot (Me) and Tannat (Ta) vine root extracts, and their major active molecule, vitisin B (VIT), against Aspergillus carbonarius growth and its ochratoxin A (OTA) production using in vitro liquid and solid, and ex vivo grape-berry assays. In liquid assay, Me and Ta (125 mg/L) and VIT (36 mg/L) significantly inhibited extracellular OTA. Additionally, VIT temporarily reduced both fungal growth and total OTA. Transcriptomics showed that VIT and Me slightly induced OTA biosynthesis genes. In solid and ex vivo assays, doses above 1 g/L decreased OTA production by up to 48% without impacting fungal growth. This lack of correlation suggested a distinct regulatory response to extract-induced stress. Importantly, the fungicide tebuconazole showed method-dependent effects. On in vitro solid medium, it significantly inhibited the fungal growth without affecting OTA yield, whereas in ex vivo berry assays, it significantly inhibited both. Our findings emphasize the potential of stilbenoid-enriched extracts as biocontrol agents targeting OTA production, highlighting the value of multi-assay evaluations. Future studies should elucidate their modes of action and optimize their efficacy.
Trang Tran-Minh, M. Corio-Costet, Marie Laurens et al.· Toxins· 0 citations
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