To investigate insertional mutagenesis in Magnaporthe grisea, we tested the transformation of protoplasts produced after protocol optimization, and analyzed the integration efficiency of pAN7-1 into the M. grisea genome mediated by the restriction endonuclease Hind III. The I-22 protoplasts were readily transformed for hygromycin resistance. When pAN7-1 was linearized with Hind III and used to transform fungal protoplasts in the presence of the corresponding enzyme, the transformation efficiency was increased 1.1 to 8.1-fold. The optimal Hind III concentration for enhanced transformation corresponded to 5 unit/transformation mix. This concentration led to average frequency of 332 transformants/µg de pAN7-1/10(7) protoplasts. The presence of selection gene hph in the 18 transformant genome was confirmed by PCR.
Pyricularia grisea; P. oryzae; brusone; fungi transformation; restriction enzyme-mediated integration; REMI
