Phytosiderophores biosynthesis

S. Shojima, N. Nishizawa, S. Fushiya, S. Nozoe, T. Irifune, and S. Mori, Biosynthesis of phytosiderophores in vitro biosynthesis of 2 -deoxymugineic acid from L-methionine and nicotianamine. Plant Phy.siol. 93 1491 (1990). 

K. Higuchi, K. Suzuki, H. Nakanishi, H. Yamaguchi, N. K. Nishizawa, and S. Mori, Cloning of nicotianamine synthase genes, novel genes involved in the biosynthesis of phytosiderophores. Plant Physiol. 779 474 (1999). 

Using the PETIS, real-time [ CJmethionine translocation was studied for barley. For the mechanism of Fe uptake in an Fe-delicient barley, it was found that leaf methionine does not participate in the reaction of mugineic acid synthesis, but the methionine produced in barley roots is used in the biosynthesis of mugineic acid phytosiderophores [131,132]. 

Sempos CT, Looker AG, Gillum RF and Makug DM (1994) Body iron stores and the risk of coronary heart disease. N Fngl J Med 330 1119-1124. Shojima S, Nishizawa NK, Fushiya S, Nozoe S, Ieieune T and Mori S (1990) Biosynthesis of phytosiderophores in vitro biosynthesis of 2-deoxy-mugineic acid from L-methionine and nicotinamine. Plant Physiol 93 1497-1503. 

Iron deficiency is a serious nutritional disorder in many crops on neutral and alkaline aerobic soils because of the low availability of iron. However, some gramineous plants such as barley and wheat have developed a specific strategy to acquire sparingly soluble iron in soil they produce MAs which, as already mentioned, are involved in the iron acquisition process as phytosiderophores. The process of iron acquisition by plants has been divided into four steps, namely Fe-deficiency-induced biosynthesis of MAs inside the roots, secretion of MAs to the rhizosphere, solubilization of sparingly soluble inorganic Fe(III) in soils by chelation with MAs, and specific uptake of MA-Fe(III) complexes by the roots [32],... 

---