Generation of benomyl resistant Beauveria bassiana strains and their infectivity against Helicoverpa armigera

SS Sandhu, Sheila Eileen Unkles, RC Rajak, James Robertson Kinghorn

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)


Beauveria bassiana transformants were obtained by conventional protoplasting and transformed by eletroporation and polyethylene glycol (PEG) treatment. These displayed mitotic stability in Beauveria bassiana. Strains transformed with pSV50 harbouring the beta -tubulin gene of Neurospora crassa grew well on benomyl concentrations of 10 mug ml(-1) unlike the recipient strain. The transformants were mitotically stable on either selective or non-selective medium. The efficiency of transformation by linear and circular pSV50 cosmid was 8 and 10 transformants per mug DNA per ml viable protoplast by electroporation, respectively, and 4 and 6 by the protoplast PEG method, respectively. Southern blot and hybridization of undigested fungal DNA of wild type and four transformants, probed with beta -tubulin sequence of pSV50, showed hybridization at high Mr region of genomic DNA in four transformants, whereas in wild type genomic DNA, no homology of the sequence was observed. Digested genomic DNA, of four transformants gave a complex hybridization pattern. Virulence tests of the transformants showed that there was no significant loss in the pathogenicity toward Helicoverpa armigera third instar larvae. This method of transformation should prove useful with entomopathogenic fungal species in which a genetic transformation system has not yet been established.

Original languageEnglish
Pages (from-to)245-250
Number of pages6
JournalBiocontrol Science and Technology
Publication statusPublished - Apr 2001


  • entomopathogenic fungus
  • Beauveria bassiana
  • biological control
  • transformation system
  • GENE


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