This mannan structure can also be phosphomannosylated, and in fact, the
phosphosugar attached to O-linked mannans represents about 20% of total cell wall phosphomannan content [21].
Phosphorus is necessary for the innumerable biochemical reactions in which phosphates serve as substrates or products such as ATP and as an integral part of phospholipids, phosphoproteins and
phosphosugars. Magnesium, like P is widely distributed in soft tissues and in the skeleton, and is involved in a numerous metabolic processes [6].
Phosphorus (P) is of equal importance to plant physiology, being a necessary constituent of ATP, nucleic acids, phospholipids,
phosphosugars, and many other important biochemical compounds (Tisdale et al., 1985).