ACCORDING TO THE INVENTION, THERE IS PROVIDED BARLEY WITH TOTAL LOSS OF FUNCTIONAL LIPOXYGENASE (LOX)-1 AND LOX-2 ENZYMES, AND PLANT PRODUCTS PRODUCED THEREOF, SUCH AS MALT MANUFACTURED BY USING BARLEY KERNELS DEFECTIVE IN THE SYNTHESIS OF THE FATTY ACID-DIOXYGENATING ENZYMES LOX-1 AND LOX-2. SAID ENZYMES ACCOUNT FOR THE PRINCIPAL ACTIVITIES RELATED TO DIOXYGENATION OF LINOLEIC ACID INTO 9- AND 13-HYDROPEROXY OCTADECADIENOIC ACID, RESPECTIVELY, 9-HYDROPEROXY OCTADECADIENOIC ACID REPRESENTS A LOX PATHWAY METABOLITE, WHICH - THROUGH FURTHER ENZYMATIC OR SPONTANEOUS REACTIONS - MAY LEAD TO THE APPEARANCE OF TRANS-2-NONENAL (T2N), THE INVENTION ENABLES BREWERS TO PRODUCE A BEER HAVING INSIGNIFICANT LEVELS OF STALE, T2N-SPECIFIC OFF-FLAVORS, EVEN AFTER PROLONGED STORAGE OF THE BEVERAGE. NO SUITABLE FIGURE.
