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Am. J. Enol. Vitic. 42:2:141-144 (1991)
Copyright © 1991 by the American Society for Enology and Viticulture.
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Effect of Climatic Conditions on Yeast Diversity in Grape Musts from Northwest Spain

E. Longo 1, J. Cansado 1, D. Agrelo 1, and T. G. Villa 1

1 Department of Microbiology. Faculty of Pharmacy. University of Santiago de Compostela. Spain.

Two hundred sixty-two yeast strains were isolated from six wineries, all located in two wine regions of northwest Spain. These regions have differences in the grape varieties, type of culture, and level of maritime influence. The two vintages considered here differed in rainfall and temperature. The most remarkable difference concerning yeast microflora between both regions corresponded to the category of species with mainly oxidative behavior. Four species, Cr. albidus, C. stellata, H. anomala, and H. silvicola, only appeared in the Atlantic region, whereas six species, C. vini, H. canadensis, H. jadinii, P. carsoni, D. intermedia, and Sp. roseus, corresponded exclusively to the interior region. A significant increment in the number of species with mainly oxidative metabolism took place during the 1986 vintage, when an important fungal proliferation was observed in both wine regions. The species C. lusitaneae, C. rugosa, C. stellata, C. vini, D. intermedia, and P. carsoni were isolated in this vintage but not in 1987 vintage. Vineyard infestation by Botrytis cinerea could affect the diversity of this group of species.

Key words: yeast

Submitted on January 19, 1990






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Copyright © 1991 by the American Society for Enology and Viticulture.