The effect of ozonated water treatment on the metabolic profile and resistance of vines to Downy and powdery mildew
Ozone is a potent oxidizing compound that quickly decomposes into oxygen without residues. Previous works reported that ozone is not only a disinfectant that directly harms the pathogens of the vine but also activates systemic defense systems in the plant by activating oxidative stress. We assume these systemic defense mechanisms are essential to the vines’ resistance to downy and powdery mildew (Plasmopara viticola & Erysiphe necator, respectively). The goals of the research are to examine the effect of spraying with ozone water on the plant’s resistance against the mentioned pathogens as well as to characterize the metabolic profile of the plants treated with ozone as well as physiological characteristics in the vines such as the level of Photosynthesis and crop yield. Vines in the vineyard sprayed with ozone water at concentrations of 2 and 4 PPM weekly and biweekly, untreated control & conventional spray. Leaves were taken from vines 2,4,7,9 and 11 days after exposure to ozone and inoculated with the pathogens. It was found that vines treated with ozone showed a reduction in infection of up to 50% relative to untreated control plants and infection levels similar to conventional spraying treatment. This resistance was maintained for 9-11 days after ozone treatment. furthermore, the leaves metabolites were extracted and analyzed in LCMSMS. It was found that vines exposed to ozone have increased levels of flavonoids and other compounds with protective activity on the plant. Also, it was found that photosynthesis levels and the crop yield weren’t affected by ozone exposure.
We found a direct relationship between ozone treatment in vines and the induction of resistance in plants by activating metabolic defense mechanisms. In addition, spraying treatment with ozonated water in the mentioned concentrations does not harm the physiology of the plant and the crop.
Issue: ICGWS 2023
1 Tel Hai Academic College, Israel
2 Northern Agriculture Research & Development, MIGAL – Galilee Research Institute, Israel
3 Extension Service, Kiryat Shemona 10200, Israel