Abstract:

Potassium, a quality element, is one of the essential nutrient elements in the process of plant growth. Too high or too low content of potassium in the environment will affect the normal growth of plants, reduce the yield and quality of plants in a way, even may lead to the death of plants. In order to solve the problem of potassium deficiency in soil and potassium nutrient stress in plants, this paper summarizes the general situation of potassium nutrient stress, the morphological characteristics of potassium nutrient stress, the influence of potassium nutrient stress on plants, the physiological and biochemical changes of potassium nutrient stress as well as the study of potassium nutrient stress in molecular level. The general situation of potassium nutrient stress is summarized from potassium, potassium nutrient stress and symptoms of potassium nutrient stress. The effects of potassium nutrient stress on plants are analyzed from growth and morphological changes, photosynthesis, nutrient absorption, osmotic adjustment and balance of reactive oxygen, yield and quality. It is concluded that the research on potassium nutrient stress in plants mainly focuses on the physiological and biochemical aspect as well as the mechanism of action, while the research on the molecular level is relatively little. The research progress of potassium nutrient stress on molecular level is emphasized, and the paper also clarifies that the research of potassium nutrient stress is important and significant. Three points of view are put forward, namely, future research should focus on the molecular physical and chemical properties of plants coping with plant potassium nutrient stress, suitable fertilizing methods and modes (according to local conditions and plant conditions), and research and development of fertilization tools.

Key words: potassium, potassium nutrition, potassium deficiency symptoms, potassium nutrient stress, fertilizing method