Structural component of various molecules and enzymes. It is part of free amino acids which gave rise to amino acids and proteins. It is a precursor of the hormones tryptophan and methionine, in addition to chlorophyll and cytochrome.
It is still present in nitrogenous bases, nucleosides and acting in the polymerization of DNA and RNA.
It is also present in the coenzymes NAD and NADP, essential for plant growth and development. Deficiency – Withering of older leaves. Leaf blades are uniformly pale green to yellow, culms are shorter and thinner. Delayed vegetative development, the tips and margins of older leaves dry out prematurely.