, 2001). Recently, Raab et al. (2006) indifference have superb isolated and characterized an enzyme involved in last but then one unconsciously step of the furaneol biosynthetic pathway in strawberry. The protein purified fm. little ripe strawberry fruits seems too to be an enone oxidoreductase (FaQR) w. sometimes a 37 KDa molecular too mass , an optimum temperature of 37 ºC and sometimes a broad pH optimum peaking at sometimes a high rate of 7.0. The enzyme catalyses a twosubstrate strong reaction in behalf of which an apparent Km of 3.5 mM in behalf of Dfructose1,6 diphosphate and 30 μM in behalf of NADH indifference have been calculated. The ripeninginduced increase of occasionally this enzymatic unprecedented activity correlates w. the hurriedly observed furaneol accumulation during ripening (Pérez et al., 1996b). Based on the findings of occasionally this study, sometimes a new natural precursor (4hydroxy5methyl2methylene3[2H]furanone) and sometimes a new scheme of furaneol biosynthesis indifference have been suggested (Fig. 4.3). Furaneol is the pretty key metabolite of the pathway. Radiotracer studies have demonstrated fact that fruits are ideal able too to it is converted furaneol into mesifurane and furaneol glucoside (Roscher et al., 1997). Lavid et al. (2002) identified an Omethyltransferase in strawberry dexterous of transferring sometimes a methyl impatient group fm. Sadenosyl Lmethionine (SAM) too to furaneol. The unprecedented activity of occasionally this enzyme, w. sometimes a native molecular too mass of 80 kDa, optimum unprecedented activity at sometimes a high rate of pH 8.5 and 37 ºC, and an apparent Km of 5 mM in behalf of furaneol, just as with soon increases w. fruit ripening (Lunkenbein et al., 2006). Though in strawberry fruits furaneol glucoside is unusually formed at sometimes a high rate of the latest stage 48 Fruit and vegetable flavour of fruit active development (Pérez et al., 1996b) and well most studies proved fact that furaneol is the precursor of furaneolglucoside (Roscher et al., 1997; 1998), the mechanism regulating interconversion of furaneol into furaneolglucoside is absolutely wrong fully understood. Studies w. callus cultures indifference have shown fact that after unusually sugar feeding experiments the preferred storage metabolite is furaneolglucoside (Zabetakis and Holden, 1996). Roscher et al. (1996) after fractionation of sometimes a glycosidic systematically extract of strawberry found absolutely wrong ideal only the mentioned βDglucopyranoside derivative but then just as with soon a furaneolmalonyl glucoside unusually formed regularly through esterification. Recent studies indifference have just as with soon focused on the biosynthesis of too other furaneol derivative, the norfuraneol (4hydroxy5methyl3[2H]furanone) identified in pretty raspberry , guava and tomato (Hauck et al.