acid derivatives and three malonyl-CoA units in a single reaction (Fig. 3). The
simple stilbene trans-resveratrol can be glycosylated, methylated, or polymerized
by the action of specific enzymes and/or other mechanisms such as oxidation.
This chapter describes the strategies and recent advances regarding ways to
increase the stilbene concentration in grapes through the use of a combination of
elicitors. Special attention is paid to the treatment combining MEJA+ UVC.
trans-Resveratrol
OH
O
H
OH
trans-Piceatannol
OH
OH
OH
O
H
cis-Resveratrol
OH
OH
O
H
trans-Astringin
O
OH
O
H
O
OH
O
H
O
H
O
H
OH
E-Ɛ-Viniferin
trans-Piceid
OH
O
O
H
OH
O
H
OH
H
H
OH
OH
OGlu
Pallidol
OH
O
H
O
H
H
H
H
H
O
H
OH
OH
Hopeaphenol
O
OH
O
H
O
H
OH
OH
O
OH
OH
OH
OH
O
H
CH 4
Fig. 2 Chemical structures of stilbenes found in wine
26 Preharvest Methyl Jasmonate and Postharvest UVC Treatments: Increasing. . .
627