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Establishing Fungal Entomopathogens as Endophytes: Towards Endophytic Biological Control
Published on: April 11, 2013
A beauvericin hot spot in the genus Isaria
J Jennifer Luangsa-Ard1, Pitchapa Berkaew, Rungpet Ridkaew
1Phylogenetics Laboratory, BIOTEC, NSTDA Science Park, 113 Paholyothin Road, Klong 1, Klong Luang, Pathum Thani 12120, Thailand. jajen@biotec.or.th
Abstract:
Beauvericin is a naturally occurring cyclohexadepsipeptide originally described from Beauveria bassiana but also reported from several Fusarium species as well as members of the genus Isaria. Twenty-six isolates of Isaria species and its Cordyceps teleomorph, and ten taxonomically close strains including Beauveria, Nomuraea and Paecilomyces species were sequenced and tested for beauvericin production. Trees using ITS rDNA and beta-tubulin sequence data were constructed and used to infer the phylogenetic distribution of beauvericin production. A group comprising Isaria tenuipes and its known teleomorph Cordyceps takaomontana, Isaria cicadae and its Cordyceps teleomorph, Isaria japonica and Isaria fumosorosea, showed positive beauvericin production which correlated well with combined ITS rDNA and beta-tubulin phylogenies. The results suggested that beauvericin can serve as a chemotaxonomic marker for these limited species of the I. tenuipes complex.
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