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Brettanomyces bruxellensis  is considered the most significant contaminant yeast in the wine industry since it causes a deterioration in the organoleptic properties of the wine and significant economic losses. This deterioration is due to the production of volatile phenols from hydroxycinnamic acids. These compounds possess antimicrobial properties; however,  B. bruxellensis  can resist this effect because it metabolizes them into less toxic ones. Recent studies have reported that  B. bruxellensis  grows under different stress conditions, including  p -coumaric acid ( p CA) but effective methods for its control have not been found yet. Since that in other yeasts, such as  Saccharomyces cerevisiae , it has been described that light affects its growth, and we evaluated whether the light would have a similar effect on  B. bruxellensis . The results show that at light intensities of 2,500 and 4,000 lux in the absence of  p CA,  B. bruxellensis  LAMAP2480 does not grow in the culture medium; however, when the medium contains this acid, the yeast adapts to both factors of stress managing to grow. The expression of genes related to oxidative stress in  B. bruxellensis  LAMAP2480, such as  SOD1 ,  GCN4 , and  ESBP6 , showed a higher relative expression when the yeast was exposed to 2,500 lux compared to 4,000 lux, agreeing with the growth curves. This suggests that a higher expression of the genes studied would be related to stress-protective effects by  p CA.

Effect of Light and p-Coumaric Acid on the Growth and Expression of Genes Related to Oxidative Stress in Brettanomyces bruxellensis LAMAP2480