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of chitinases and thaumatin-like proteins between 20 and 30 kDa. Concerning the protein composition, minor differences became obvious only between vintages but not between the stressed and watered samples. In-solution digest of proteins from Riesling grapes 2008 followed by LC-MS n and database research identified 15 proteins originating from grapes and 10 from the yeast Saccharomyces cerevisiae. In conclusion, our study demonstrates the importance to develop new strategies to prevent increased haze formation in wine under the predicted conditions of climate change. Prevention of drought stress by drip irrigation can be considered as one strategy to decrease protein amounts in wines.

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