Iron in the soil solution In aerobic soils Fe2+ is oxide to Fe3+ and formation of Fe(oH)3 precipitation In water-saturated soils(anaerobic) Fe3+ is converted into fe2+ which increase Fe solubility Fe(oH)3 +e +3H*Fe2++3H2O
In aerobic soils , Fe2+ is oxide to Fe3+ , and formation of Fe(OH)3 precipitation. In water-saturated soils (anaerobic), Fe3+ is converted into Fe2+, which increase Fe solubility. Fe(OH)3 +e-+3H+ Fe2+ +3H2O Iron in the soil solution
Siderophores and phytosiderophores Siderophores are a kinds of organic substance(such as nicotinamide(烟酰胺), mugineic acid麦 根酸 and aveni acid etc) produced by the bacteria, fungi and plant), which can form organic complexes or chelates with Fe3+ and increase the movement of iron in soil
Siderophores and phytosiderophores Siderophores are a kinds of organic substance (such as nicotinamine (烟酰胺), mugineic acid麦 根酸 and avenic acid etc) produced by the bacteria, fungi and plant), which can form organic complexes or chelates with Fe3+, and increase the movement of iron in soil
Characteristics of siderophores they are molecules with a high affinity for Fe3+, and removes the Fe from minerals and contributes their dissolution these Fe-chelates are highly soluble and are stable over a wide ph range they are of crucial importance for the Fe transport in soils and the Fe supply of plants
Characteristics of siderophores they are molecules with a high affinity for Fe3+, and removes the Fe from minerals and contributes their dissolution. these Fe-chelates are highly soluble and are stable over a wide pH range. they are of crucial importance for the Fe transport in soils and the Fe supply of plants
Plant uptake of Fe 1. Plants can take up both Fez+ and Fe3+ In general, Fezt pass through a species channel of pm. fe3+ is reduced to fe2+ before absorption occurs. Fe3+ uptake is important for grasses Phytosiderophores molecular is take up by specific transporters located in PM of graminaceous禾本科 monocots root, and Fe is reduced in cells
Plant uptake of Fe 1. Plants can take up both Fe2+ and Fe3+ . In general, Fe2+ pass through a species channel of PM. Fe3+ is reduced to Fe2+ before absorption occurs. Fe3+ uptake is important for grasses Phytosiderophores molecular is take up by specific transporters located in PM of graminaceous禾本科 monocots root, and Fe is reduced in cells
Factors that affect Fe uptake 1. Plants have different abilities to take up Fe from the soil solution Not only different species(wheat VS bean) but even different genotypes 2. pH Fe3+ reduction requires a pH of about 5 at the apoplastic site of the reductase The fe uptake of general plant is affected by the pH, but Fe uptake of graminaceous monocots is little affected by pH 3. Ability of Fe3+ reduction in the root
Factors that affect Fe uptake 1. Plants have different abilities to take up Fe from the soil solution Not only different species (wheat vs. bean) but even different genotypes. 2. pH Fe3+ reduction requires a pH of about 5 at the apoplastic site of the reductase. The Fe uptake of general plant is affected by the pH, but Fe uptake of graminaceous monocots is little affected by pH. 3. Ability of Fe3+ reduction in the root