Application of antagonistic Metschnikowia strains against Botrytis cinerea in vineyards
Less and less chemical plant protection products are approved by the E U. Plant pathogenic fungi become increasingly resistant to the active ingredients that have been around for a long time. Besides, there is a valid demand for effective products that can be applied in organic cultivation.
We examined Metschnikowia strains under laboratory conditions in order to find effective strains against B. cinerea. The antimicrobial mechanism of these yeasts is based on the competition for the ferric ions from the environment. Metschnikowia cells release the pulcherriminic acid which chelates with Fe3+, forming the pigment pulcherrimin. The ability of M. pulcherrima of depleting Fe from the growth media is correlated with it’s ability to inhibit the growth of many microorganism. We compared the strains’ ability to produce pulcherrimin and their ability to inhibit different pathogenic fungi in laboratory conditions. Pulcherrimin production was also reported in the case of other yeast species. Krause et al. (2018) described four genes (PUL1-4) forming a PULcherrimin (PUL) gene cluster present in Kluyveromyces. lactis, K. aestuarii, M. fructicola and Zygotorulaspora mraki. We have also identified the four PULgenes in our effective M. pulcherrima strains.
We conducted field studies in three vintages using a specific M. pulcherrima strains. Based on our results, we can state that we have found an effective method to protect grape against B cinerea, which can be applied both in organic cultivation and also before harvest in conventional technology.
Acknowledgements: The authors would like to thank Anita Kovács, Ilona Szilágyi and Szilvia Struba for the profession technical assistance. This research was financed by the grant 2020-1.1.2-PIACI-KFI-2020-00130
1) Krause D.J., Kominek J., Opulente D.A., Shen X.X., Zhou X., Langdon Q.K., DeVirgiliof J., Hulfachora A.B., Kurtzmanf C.P., Hittinger C.T. 2018. Functional and evolutionary characterization of a secondary metabolite gene cluster in budding yeasts. Proc. Natl. Acad. Sci. 115, 11030-11035. DOI: 10.1073/pnas. 1806268115
Issue: ICGWS 2023
1Department of Genetics and Applied Microbiology, Faculty of Science and Technology, University of Debrecen, H-4032 Debrecen, Hungary
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crop protection, bioprotection, antagonism, Metschnikowia, Botrytis cinerea