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The objectives of this work were to evaluate the efficacy of  Eucalyptus camaldulensis  green branches (GB) and  Origanum majorana  whole plant (WP) essential oils (EOs) on  Tri4  gene expression and  Fusarium oxysporum  strains growth  In vitro . Five strains of  Fusarium oxysporum  were identified molecularly through polymerase chain reaction (PCR) amplification of the internal transcript spacer (ITS) region. The efficacy of the EOs from  Eucalyptus camaldulensis  GB and  Origanum majorana  WP on  Tri4  gene expression and  F. oxysporum  strains growth were evaluated  In vitro . GC-MS analysis of the EOs referred that 1,8-cineole, and spathulenol were presented in  E. camaldulensis  GB, while in  O. majorana  WP were tricyclene, and  p -cymene as abundant compounds.  E. camaldulensis  and  O. majorana  EOs showed MIC of 32–64 µg/mL and 32 µg/mL, respectively.  E. camaldulensis  EO was more suppressive against all the  F. oxysporum  strains. Both EOs reduced  Tri4  gene expression significantly compared with control. qRT-PCR results revealed a down-regulation in  Tri4  gene expression of all of  F. oxysporum  strains exposed to both EOs at the MIC values. The results suggest that both EOs can be used as safe and green bio-pesticide.

archives of phytopathology and plant protection

Down-regulatory effect of essential oils on fungal growth and  Tri4  gene expression for some  Fusarium oxysporum  strains: GC-MS analysis of essential oils