It is responsible for the stomatal movement, the k ion acts directly on the opening and closing of the stomata. This control over stomatal opening is directly linked to water absorption, due to the difference in water potential that is caused by water loss.
Participates in photosynthesis and translocation of Synthesizers. Potassium in photosynthesis is linked to the influence on the synthesis of rubisco, the main enzyme responsible for carbon fixation. It is activator of more than 60 enzymes. It also participates in nitrogen metabolism by participating in carbohydrate metabolism. It acts on meristematic growth.
Deficiency – It manifests itself through thin culms and less resistant to overturning, its leaves are yellowish, with necrosis.