Bioactive compounds in fruits are affected by light quality

Abstract

The effects of blue and red light irradiation at night on anthocyanin synthesis and abscisic
acid (ABA) metabolism were investigated in grape berries. Endogenous ABA were highest
in red light-emitting diode (LED)-treated skin. In contrast, anthocyanin concentrations
were highest in blue LED-treated skin, followed by red LED treatment. However, the
expressions of VlMYBA1-2 and UDP-glucose-flavonoid 3-O-glucosyltransferase(VvUFGT)
did not necessarily coincide with anthocyanin concentrations. The results suggest that blue
LED irradiation at night may be effective in increasing anthocyanin in grape berries. The
effect of UV-C irradiation on jasmonate, polyamines (putrescine) and antioxidant activities
was investigated in apple plants. The EC50 values of O2
- -scavenging activity in the UV-C
treated leaves were lower than those in the untreated control. The endogenous jasmonic
acid and putrescine concentrations in the UV-C treated plants were higher than those in the
untreated control. These facts suggest that the increase of jasmonates and polyamines may
be associated with UV-C stimulation, and UV-C irradiation may be effective for increasing
antioxidant activity in apple plants.