Enzymatic activator, especially synthetases, oxidoreductases, dehydrogenases, transferases, kinases and aldolases.
It is involved in protein synthesis: plants with low potassium content have low protein content, with accumulation of low molecular weight compounds such as amino acids, amides, amines and nitrates. It acts on metabolism (activation of starch synthetase, sucrose phosphate synthetase and other enzymes) and carbohydrate transport.
Deficiency – Initially the old leaves present reddening of the edges that progresses towards the center of the leaf. At this stage, leaf tips often dry out.