The invention provides an
entomopathogenic fungi transgenic strain which contains a homologous or
heterologous acidic
trehalase constitutive exogenous
gene. The preparation method of the
entomopathogenic fungi transgenic strain comprises the following steps: firstly building an acidic
trehalase full-length cDNA
gene constitutive
expression vector; establishing a submerged conidia transformation
system; and finally selectively screening to obtain the
entomopathogenic fungi transgenic strain. The invention also provides application of
Entomopathogenic fungi acidic
trehalase transgenic strain in preparing fungal
pesticide. The entomopathogenic fungi transgenic strain has high efficiency of expressing trehalase; and the preparation method has the advantages of easy operation, good
repeatability and good reproducibility. The entomopathogenic fungi transgenic strain can be applied to preparing the fungal
pesticide. When the fungal
pesticide acts on insects, through the overexpression of the acidic trehalase
gene via the transgenic strain, the activity of acidic trehalase in an
insect host is improved, utilization of the trehalase is accelerated and growth of entomopathogenic fungi in the
insect host is promoted, thus effectively improving the insecticidal activity of the fungal pesticide such as
metarhizium anisopliae,
beauveria bassiana and the like.