Spraying KHPO Alleviates the Damage of Spring Low-Temperature Stress by Improving the Physiological Characteristics of Wheat Flag Leaves.

The low-temperature stress (LTS) in spring results in tremendous yield loss in wheat production, and the application of potassium dihydrogen phosphate (KHPO) can alleviate stress-induced damage. However, the underlying effect of spraying KHPO on the physiological characteristics of wheat flag leaves under spring LTS remains unclear. In this study, we investigated the effect of spraying KHPO on flag leaf physiological traits and yield under spring LTS, including treatments at 15 °C and spraying HO (CK), treatment at -4 °C and spraying HO (LT1), and treatment at -4 °C and spraying KHPO (LT2).