Wound induces sequential synthesis and conductance of different phytohormones in apple wounds

Phytohormones synthesis involved in wound stress in fruit and vegetables has been reported, whether wound induces the phytohormones synthesis and conduction in fruit, and the responses the time sequence has not been reported. In this study, the apples were used as the experimental material, transcriptomic profiling indicated that differentially expressed genes (DEGs) mainly enriched in salicylic acid (SA), ethylene (ET), abscisic acid (ABA) and jasmonic acid (JA) synthesis and signaling at wounds of apple fruit. Wound significantly up-regulates the expression of the above phytohormone synthesis-related genes, and promotes the biosynthesis of SA, ABA, ET and JA at fruit wounds. There are temporal differences in the production of these hormones. SA was synthesized earliest, followed by ABA and ET, and finally JA. Wound also up-regulated the expression of the above-mentioned gene related to hormone transduction and promoted the signal transduction of SA, ABA, ET and JA. In conclusion, wound can induce the sequential synthesis and conductance of different phytohormones in apple wounds. This study reveals the sequential synthesis and signaling of key phytohormones in apple fruit in response to wounding, providing valuable insights for improving postharvest quality and stress resistance strategies.