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 .
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 .
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).