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Updating on the fungal composition in Sardinian sheep's milk by culture-independent methods

Published online by Cambridge University Press:  26 March 2014

Simona Panelli ,
Eva Brambati ,
Cesare Bonacina  and
Maria Feligini
Simona Panelli
Affiliation:
Laboratorio Qualità dei Prodotti, Istituto Sperimentale Italiano ‘Lazzaro Spallanzani’, Località La Quercia, 26027 Rivolta d'Adda (Cremona), Italy
Eva Brambati
Affiliation:
Laboratorio Qualità dei Prodotti, Istituto Sperimentale Italiano ‘Lazzaro Spallanzani’, Località La Quercia, 26027 Rivolta d'Adda (Cremona), Italy
Cesare Bonacina
Affiliation:
Laboratorio Qualità dei Prodotti, Istituto Sperimentale Italiano ‘Lazzaro Spallanzani’, Località La Quercia, 26027 Rivolta d'Adda (Cremona), Italy
Maria Feligini*
Affiliation:
Laboratorio Qualità dei Prodotti, Istituto Sperimentale Italiano ‘Lazzaro Spallanzani’, Località La Quercia, 26027 Rivolta d'Adda (Cremona), Italy
*
*For correspondence; e-mail: [email protected]
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Abstract

This work applies culture-independent methods for the characterization of fungal populations (yeasts and moulds) naturally occurring in Sardinian ewe's milk sampled in the Italian areas with the largest dairy production (Sardinia and Lazio regions). Sequences of the D1/D2 variable domains at the 5′ end of the 26S rRNA gene were obtained by amplification of DNA directly isolated from milk, and this allowed identification of a total of 6 genera and 15 species of fungi. Among the 6 identified genera Geotrichum spp., Candida spp., Phaeosphaeriopsis spp., Pestalotiopsis spp. and Cladosporium spp. belong to the phylum of Ascomycota, while Cryptococcus spp. is part of the phylum of Basidiomycota. In particular, two genera (Pestalotiopsis and Phaeosphaeriopsis) and two species (Plectosphaerella cucumerina and Pryceomyces carsonii) have never been reported in dairy ecosystems before. Results provide evidence that several moulds and yeasts, previously described only in ovine cheeses, are transferred directly from raw milk. The knowledge of fungal consortia inhabiting sheep raw milk is a particularly relevant issue because several species are directly involved in cheese making and ripening, determining the typical aroma. On the other hand, spoilage yeasts and moulds are involved in anomalous fermentation of cheese and may be responsible for considerable economic losses and serious risks for consumers' health.

Keywords

Fungiyeastsmouldsmilk26S rRNA
Type
Research Article
Information
Journal of Dairy Research , Volume 81 , Issue 2 , May 2014 , pp. 233 - 237
Copyright
Copyright © Proprietors of Journal of Dairy Research 2014 

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