Genetic transformation of filamentous fungi is an essential tool in many areas such as biotechnology, medicine, phytopathology and genetics. However, available protocols to transform fungi are inefficient, laborious and have low reproducibility. We report the use of underwater shock waves as a novel method to transform filamentous fungi. An experimental piezoelectric shock wave generator was designed to expose fungal conidia to heterologous DNA. The device was successfully tested in Aspergillus niger, Fusarium oxysporum, Trichoderma reesei and Phanerochaete chrysosporium. The transformation frequency per number of conidia was between two and four orders of magnitude higher in comparison to previously published methods. For example, the frequency of transformation in A. niger was improved up to 5400-fold as compared with Agrobacterium protocols. Transformation was verified by expression of the green fluorescent protein, PCR and Southern blot. Our method offers new possibilities for fast, easy and efficient genetic manipulation of diverse fungal species.
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