Foliar Application of Chitosan Accelerates Wound Periderm Formation with an Intensified Deposition of Suberin Polyphenolic and Lignin in the Wounds of Potato Tubers

Potato tubers are susceptible to wounding during post-harvest processes, leading quality decline, perishability and large economic losses. In this study, the potato cultivar, ‘Longshu No.7′, was foliar-sprayed with 3% chitosan (w/v) three times pre-harvest period after flowering evaluate effect of foliar spraying on suberization processing in wounds harvested tubers. Our results demonstrated that sprayed significantly reduced wound-induced fresh weight loss dry rot disease index by 37.34% 41.60% day 28 wounding, respectively. Foliar accelerated deposition suberin polyphenolic lignin at wound sites formation thicker cell layers. This occurred increased localized activities key enzymes pathways, including phenylalanine ammonia lyase, 4-coumaryl-coenzyme A ligase, cinnamyl alcohol dehydrogenase peroxidase (33.90–64.32%), as well contents cinnamic acid, sinapic flavonoids, lignins total phenolics (19.70–23.46%) wounded 7 wounding. indicated application could mitigate product damages.