Exogenous phytosulfokine ? (PSK?) application delays senescence and relieves decay in strawberry fruit during cold storage by triggering extracellular ATP signaling and improving ROS scavenging system activity

Abstract During postharvest life, strawberry fruit as a perishable commodity exhibiting short shelf life suffers from fungal decay that severely limits its marketability and nutritional value. Herein, we investigated the mechanisms activated by exogenous phytosulfokine ? (PSK?) application at 150 nM to delay senescence relieve in during storage 4 °C for 18 days. Our results showed higher extracellular adenosine triphosphate (ATP) accumulation arising lower apyrase 1 (APY1) gene expression treated with PSK? 6 days may serve signaling molecule promote NADPH oxidase activity trigger H2O2 giving rise SUMO E3 ligase (SIZ1) of °C. Also, superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APX), glutathione reductase (GR) genes enzymes associated methionine sulfoxide (MSR) peroxiredoxin (Prx) be ascribed ATP signaling. As result, promoting ROS scavenging systems triggering responsible maintenance membrane integrity shown malondialdehyde (MDA) Besides, fruits exhibited weight loss, total soluble solids, chroma value concurrent firmness, titrable acidity, L* value, hue angle quality attributes, which indicated delayed senescence. Based on our findings, unveils potential used promising biopeptide alleviation life.