Synthesis of trans-resveratrol and rotting control in apples with use of elicitors in post‑harvest

Abstract

The objective of this study was evaluate the effect of the application of abiotic elicitors of resveratrol in 'Gala' and 'Fuji' apples, and rotting control. The treatment was with ultraviolet irradiation, phosphite and
acibenzolar-S‑methyl, applied before controlled atmosphere storage and ozone, applied so intermittently during storage. The storage conditions were: 'Gala' (1.5 kPa O2 and 2.5 kPa CO2, at 0.5±0.1°C by eight months) and 'Fuji' (1.0 kPa O2 and <0.5 kPa CO2, at ‑0.5±0.1°C for seven months). The experimental design was a completely randomized with eight repetitions of 25 fruits. In the skin of fruit trans-resveratrol were analyzed by high performance liquid chromatography; total polyphenols and anthocyanins by spectrophotometry and diameter of injury after inoculation by Penicillium sp. Firmness, acidity, total soluble solids, and reducing and non‑reducing sugars were analyzed in the flesh. The elicitores do not change the concentration of phenols
and anthocyanins, with the exception of the loss of total anthocyanins with acibenzolar-S‑methyl in 'Gala' apple. The elicitors induce in 'Fuji' apples the synthesis of trans-resveratrol in the sequence: acibenzolar-
S‑methyl>phosphite≥UV‑C irradiation≥ozone. There isn’t correlation between synthesis of trans-resveratrol and rotting control, but the phosphite controlled rot in 'Gala'.