Improvement of grape phenolic content and antioxidant activity by pre-harvest application of methyl jasmonate

In this study the effect of pre-harvest methyl jasmonate (MJ) treatment, as a safe chemical elicitor in different concentrations (0, 1, 5, and 10 mM), of flavonoid (TFC), total tannin (TTC), and antioxidant activity were evaluated throughout 6 days storage.
Although, MJ treatment stimulated an increase in TPC, TFC, and antioxidant activity during storage time, at the end of storage a reduction in their amounts was found.
The interaction between MJ treatment and storage time was significant only for antioxidant activity measured by DPPH (2,2-diphenyl-1-picrylhydrazyl) assay so that MJ treated-samples had higher radical scavenging ability on day 4 of storage.
However, pre-harvest MJ treatment had no effect on TTC of skin samples during storage.
These results suggested that pre-harvest treatment of MJ can be used as an environmentally friendly approach to enhance phenolic content and antioxidant capacity of ‘Thompson Seedless’ grape for a limited storage time.

XXX International Horticultural Congress IHC2018: International Symposium on Fruit and Vegetables for Processing, International Symposium on Quality and Safety of Horticultural Products and VII International Symposium on Human Health Effects of Fruits and Vegetables

E. Ranjbaran, M. Gholami, M. Jensen

Vitis vinifera, preharvest treatment, bioactive compounds, phytochemicals, flavonoid, free radical scavenging

https://doi.org/10.17660/ActaHortic.2020.1292.54