求翻译：The fact that the mutant, but not the wild-type, was able to produce the toxin when ammonium is replaced by nitrate is in agreement with this hypothesis (result not shown). However, alleviating a possible nitrogen repression by transferring the mycelium of the FgDPac1 strain cultured in BMS6.5 medium to a BMS6.5 medium depleted of nitrogen(starvation condition) did not allow trichothecenes production (result not shown). Additional experiments are necessary in order to identify the factor blocking Tri genes expression under neutral to是什么意思？

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