68 research outputs found
Anthocyanin concentration and antioxidant activity in light-emitting diode (LED)-treated apples in a greenhouse environmental control system
Introduction. Anthocyanins are a group of flavonoids, and their synthesis is
influenced by external and internal factors such as light, temperature, phytohormones and
sugar concentration. A high anthocyanin concentration, which is related to redder
coloration, is one of the factors of high-quality fruit. The effects of LED irradiation on
the anthocyanin concentration and enzymatic and antioxidant activities in apple skin were
studied. Materials and methods. Nine 8-year-old ‘Tsugaru’ apple trees
(Malus domestica Borkh.) grafted onto Malling26 (M.26 EMLA) rootstocks
planted in 45-L plastic pots covered with polyvinyl film (90% transmittance) and grown in
a greenhouse were used. The effects of red or blue light-emitting diode (LED) irradiation
on anthocyanin accumulation, the expression of MdMYB10 and
UDP-glucose-flavonoid 3-O-glucosyltransferase (MdUFGT) and
superoxide anion radical (O\hbox{} scavenging activity in the skin of ‘Tsugaru’ apples
were investigated under early heating cultivation in a greenhouse. Results and
discussion. The anthocyanin concentrations in red LEDtreated apples were
increased compared with those of the blue LEDtreated apples and the untreated control at
130 days after full bloom (DAFB). The relative expression of MdMYB10 and
MdUFGT genes at 130 DAFB was also highest in the skin of apples treated
with red LED light. The skin of apple fruits treated with red or blue LED light showed
significantly low EC50values. Conclusion. These results suggest
that red LED irradiation may be used in a controlled environment such as a greenhouse to
increase the anthocyanin synthesis and antioxidant activity in apple skin
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