Even in same vineyard, different microbes may create variations in wine grapes

Yeast species may cause differences in otherwise identical grapes from the same vineyard

2012-12-27

(Press-News.org) Choosing the perfect wine may soon involve more than just knowing the perfect vintage and chateau. Differences in the microbes present on grapes even in different parts of the same vineyard may contribute to flavor fluctuations in samples of grapes from different tanks, according to research published December 26 in the open access journal PLOS ONE by Mathabatha Setati and colleagues from Stellenbosch University, South Africa.

"In the wine industry, the fungal communities on grapes are especially important. The microbial species present on the berry may contribute to the fermentation process, and therefore the aromatic properties of the resulting wine", the authors explain. For this study, the researchers sampled grapes from different vines in three well-established commercial vineyards, each of which used a different farming system - organic, traditional or biodynamic- to cultivate the grapes.

Across the three cultivation practices, they found that the same yeast species dominated in all vineyards, but the least treated vineyard had more variety of fungal species than the other two. They also found that within a single vineyard, small differences between vines, such as in temperature or sun exposure, could significantly alter the composition of the fungal community on grape surfaces. Setati adds, "Our findings could help viticulturalists and winemakers plan microharvest better, and implement better wine blending strategies to ensure consistency."

### Citation: Setati ME, Jacobson D, Andong U-C, Bauer F (2012) The Vineyard Yeast Microbiome, a Mixed Model Microbial Map. PLoS ONE 7(12): e52609.doi:10.1371/journal.pone.0052609

Financial Disclosure: This work was supported by Stellenbosch University (Subcom- B fund), WineTech and the National Research Foundation (THRIP programme). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

Competing Interest Statement: The authors have declared that no competing interests exist.

PLEASE LINK TO THE SCIENTIFIC ARTICLE IN ONLINE VERSIONS OF YOUR REPORT (URL goes live after the embargo ends): http://dx.plos.org/10.1371/journal.pone.0052609

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Even in same vineyard, different microbes may create variations in wine grapes

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