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The biosynthesis of gibberellic acids by the transformants of orchid-associated Fusarium oxysporum

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Abstract

The genus Fusarium, including multiple strains in the Gibberella fujikuroi species complex (GFC), is well known for its production of diverse secondary metabolites. F. fujikuroi, associated with the “bakanae” disease of rice, is an active producer of gibberellins (GAs), a wide class of plant hormones. In addition to some members of the GFC, the GA biosynthetic gene cluster, or parts of it, occurs also in some isolates of the closely related species of F. oxysporum, which does not belong to the GFC. However, production of GAs has never been observed in any F. oxysporum strain. In this study, we report on the GA biosynthetic activity in an orchid-associated F. oxysporum strain by transforming a cosmid with the entire F. fujikuroi GA gene cluster. Southern and Northern blot analyses confirmed not only the integration of the entire gene cluster into the genome but also the active expression of the seven GA biosynthetic genes under nitrogen-limiting conditions. The transformants produced GAs at levels similar to those of F. fujikuroi. These data show that the regulatory network for expression of GA genes is fully active in the F. oxysporum background.

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Acknowledgments

The author is grateful to Prof. Dr. Bettina Tudzynski (University of Münster, Germany) for supervising the study. I cordially acknowledge Dr. Christiane Bömke and Sabine Huber for technical assistance, and thank the Moscow State University-DAAD “Vladimir Vernadsky” program [fellowship number A/13/80977] for supporting this project.

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  1. Elena A. Tsavkelova

    Present address: Department of Microbiology, Faculty of Biology, Lomonosov Moscow State University, Leninskie Gory, 1-12, 119234, Moscow, Russia

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  1. Institut für Biologie und Biotechnologie der Pflanzen, Westfälische Wilhelms-Universität Münster, Schlossplatz 8, 48143, Münster, Germany

    Elena A. Tsavkelova

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Correspondence to Elena A. Tsavkelova.

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Tsavkelova, E.A. The biosynthesis of gibberellic acids by the transformants of orchid-associated Fusarium oxysporum . Mycol Progress 15, 12 (2016). https://doi.org/10.1007/s11557-015-1156-6

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  • DOI: https://doi.org/10.1007/s11557-015-1156-6

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