To obtain the phlACBD gene cluster responsible for 2,4-DAPG synthesis from strain J12, primers pF322 (5′-AAGGATCCAATGGAGCTCCGAG-3′) and phl2a (5′-GAGGACGTCGAAGACCACCA-3′) were designed based on the conserved amino acid sequences of the 2,4-DAPG gene cluster from P. fluorescens 2P24 (DQ083928) ( Zhou 2005). The PCR product was cloned into the vector pMD19-T and transferred to E. coli DH5α for sequencing and BLAST analysis.