Abstract
In this work, we studied the ecological interactions between grape berry microorganisms and Drosophila sp. flies involved in sour rot disease during grape ripening. After veráison the total microbial counts of grape berries affected by sour rot increased from about 2 log CFU/g of berries to more than 7 log CFU/g. Berry damage provoked a clear shift in yeast diversity from basidiomycetes to ascomycetous fermentative species. The latter were mostly Pichia terricola, Hanseniaspora uvarum, Candida zemplinina, and Zygoascus hellenicus. However, these species were not able to produce the metabolites characteristic of sour rot (gluconic and acetic acids) in inoculated berries. On the contrary, the acetic acid bacteria Gluconacetobacter saccharivorans produced high levels of these acids, mainly when berries were incubated in the presence of the insect Drosophila sp. Sour rot was not observed when grape bunches were physically separated from insects, even when berries were artificially injured. The wounds made in berry skin healed in the absence of insects, thus preventing the development of sour rot. Therefore, in the vineyard, the induction of sour rot depends on the contamination of wounded berries by a microbial consortium—yeasts and acetic acid bacteria—transported by drosophilid insects which disseminate sour rot among damaged berries. In the absence of these insects, plant defense mechanisms are effective and lead to skin healing, preventing disease spread. Thus, we showed that Drosophila sp. act as a vector for microorganisms associated with grape sour rot disease.
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Acknowledgments
This work was partially funded by Portuguese Science and Technology Foundation (FCT) and by POCI 2010, participated by the European fund FEDER under the projects POCI/AGR/56771/2004 and PTDC/AGR-ALI/101393/2008. The authors gratefully thank the Analytical Services of Adega Cooperativa de Borba winery for the grape musts FTIR analyses. A. Barata was the recipient of a PhD grant (Ref. SFRH/BD/28451/2006) from the FCT.
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Barata, A., Santos, S.C., Malfeito-Ferreira, M. et al. New Insights into the Ecological Interaction Between Grape Berry Microorganisms and Drosophila Flies During the Development of Sour Rot. Microb Ecol 64, 416–430 (2012). https://doi.org/10.1007/s00248-012-0041-y
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DOI: https://doi.org/10.1007/s00248-012-0041-y