The occurrence of killer, sensitive, and neutral yeasts in Brazilian Riesling Italico grape must and the effect of neutral strains on killing behaviour

Applied Microbiology and Biotechnology
G A da Silva

Abstract

The occurrence of killer toxins amongst yeast in Brazilian Riesling Italico grape must was investigated by using the sensitive strain EMBRAPA-26B as a reference strain at 18 degrees C and 28 degrees C. From a total of 85 previously isolated yeasts, 21 strains showed ability to kill the sensitive strain on unbuffered grape must/agar (MA-MB) and 0.1 M citrate/phosphate-buffered yeast extract/peptone/dextrose/agar (YEPD-MB) media both supplemented with 30 mg/l methylene blue. The killer activity of only four yeasts depended on the incubation temperature rather than the medium used. At 28 degrees C, the strains 11B and 53B were not able to show killer action. On the other hand, strains 49B and 84B did not kill the sensitive yeast at 18 degrees C. The killer strain EMBRAPA-91B and a commercial wine killer yeast K-1 were employed to examine the sensitivity of the isolated yeasts on YEPD-MB and MA-MB at 18 degrees C. The sensitivity and neutral characteristics of yeasts were shown to be dependent on the medium and the killer strain. Interactions, including K-R-, K-R+ and K+R+ strains, simultaneously, have revealed that some K-R+ strains appear to protect the K-R- strain against the killer toxin. Sensitive dead cells, although to a les...Continue Reading

Citations

May 11, 2005·Folia Microbiologica·B ZarowskaJ Chrzanowska
Jul 19, 2012·World Journal of Microbiology & Biotechnology·Yolanda Paola MaturanoFabio Vazquez
Aug 1, 2012·Proceedings of the National Academy of Sciences of the United States of America·Irene StefaniniDuccio Cavalieri
Apr 2, 2014·Applied Microbiology and Biotechnology·Bruna Carla AgustiniGildo Almeida da Silva
May 29, 2007·International Journal of Food Microbiology·Marcela Paula SangorrínAdriana Catalina Caballero
Mar 12, 2019·PloS One·Susana RodriguesLuis M T Jesus
Dec 3, 1998·Applied and Environmental Microbiology·M RamirezJ A Regodon

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