supported by the National Natural Science Foundation of China(31972389);the earmarked fund for the China Agriculture Research System(CARS-27);the Key S&T Special Projects of Shaanxi Province(2020zdzx03-01-02);Tang Scholar.The authors are grateful to Dr.Zhihong Zhang of Shenyang Agricultural University for donating the‘Gala'apple(M.domestica cv.Gala)plants.
Melatonin is involved in plant responses to various environmental stresses.Although many studies have demonstrated that the tolerance of plants to stress is improved by exogenous melatonin,the role of endogenous melat...