求翻译：constructed in F. graminearum which showed a reduced development under neutral and alkaline pH,increased sensitivity to H 2 O 2 and an earlier Tri gene induction and toxin accumulation at acidic pH. A strain expressing the FgPac1 c constitutively active form of Pac1 exhibited a strongly repressed Tri gene expression and reduced toxin accumulation at acidic pH. These results demonstrate that Pac1 negativelyregulates Tri gene expression and toxin production in F. graminearum.是什么意思？

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