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Numerous allelopathic plant secondary metabolites impact plant–microorganism interactions by injuring plant-associated beneficial bacteria and fungi. Fungi belonging to the genus  Trichoderma  positively influence crops, including benzoxazinone-containing maize. However, benzoxazinones and their downstream metabolites such as benzoxazolinone and phenoxazinones are often fungitoxic. Specimen  Trichoderma viride  F-00612 was found to be insensitive to 100-µM phenoxazinone and 500-µM benzoxazolinone. Screening of 46 additional specimens of ascomycetes revealed insensitivity to phenoxazinones among fungi that cause disease in benzoxazinone-producing cereal crops, whereas many other ascomycetes were highly sensitive. In contrast, most of the screened fungi were insensitive to benzoxazolinone.  T. viride  F-00612 was associated with bacteria and, thus, existed as a consortium. By contrast,  Enterobacter  species and  Acinetobacter calcoaceticus  were prominent in the original specimen, and  Bacillus  species predominated after antibiotic application. Prolonged cultivation of  T. viride  F-00612 in liquid medium and on Czapek agar in the presence of &lt; 100 µM phenoxazinone and &lt; 500 µM benzoxazolinone resulted in a massive loss of bacteria accompanied by impacted fungal growth in the presence of phenoxazinone. The original consortium was actively involved in implementing metabolic sequences for the degradation and detoxification of nitrated benzoxazolinone derivatives. The 2-aminophenol was rapidly converted into acetamidophenol, but benzoxazolinone, methoxylated benzoxazolinone, and picolinic acid remained unchanged. Excluding phenoxazinone, none of the tested compounds markedly impaired fungal growth in liquid culture. In conclusion, members of the  T. viride  F-00612 consortium may contribute to the ability to manage benzoxazinone downstream products and facilitate BOA-6-OH degradation via nitration.

The Trichoderma viride F-00612 consortium tolerates 2-amino-3H-phenoxazin-3-one and degrades nitrated benzo[d]oxazol-2(3H)-one