Abstract
Mugineic acid (MA; (2S, 2′S, 3′S, 3″S)-N-[3-carboxy-3-(3-carboxy-3-hydroxypropylamino)-2-hydroxypropyl]-azetidine-2-carboxylic acid), a multidentate complexing agent, is exuded by the roots of graminaceous plants (e.g. barley) growing under Fe-deficient conditions. The nature of the interactions of MA with Fe (hydr)oxide minerals in soils is thus of considerable practical importance. To examine the availability of MA in dissolving Fe (hydr) oxides, we investigated the amounts of Fe dissolved from 24 samples of Fe (hydr)oxides by 100 μM MA (FeMA) and 200 mM NH4-oxalate (Feo). The Feo values were much larger than the FeMA ones, though the crystallinity of the Fe (hydr)oxides was a significant factor. For Fe (hydr)oxides consisting of goethite, hematite, ferrihydrite, and their mixture, FeMA increased with the increase of Feo, indicating that FeMA would be correlated with FeD, that is the amount of short-range ordered Fe minerals including ferrihydrite. For goethite, hematite, magnetite, maghemite, and lepidocrocite with a high crystallinity, MA was relatively ineffective in dissolving Fe, although a part of crystalline magnetite, maghemite, and lepidocrocite could be dissolved by NH4-oxalate. For soils containing significant amounts of magnetite, maghemite, lepidocrocite, it is unlikely therefore that Feo would be a useful indicator of plant-available Fe.
| Original language | English |
|---|---|
| Pages (from-to) | 305-313 |
| Number of pages | 9 |
| Journal | Soil Science and Plant Nutrition |
| Volume | 44 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - Jan 1 1998 |
| Externally published | Yes |
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All Science Journal Classification (ASJC) codes
- Soil Science
- Plant Science
Cite this
Dissolution of iron from iron (Hydr)Oxides by mugineic acid. / Hiradate, Syuntaro; Inoue, Katsuhiro.
In: Soil Science and Plant Nutrition, Vol. 44, No. 3, 01.01.1998, p. 305-313.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Dissolution of iron from iron (Hydr)Oxides by mugineic acid
AU - Hiradate, Syuntaro
AU - Inoue, Katsuhiro
PY - 1998/1/1
Y1 - 1998/1/1
N2 - Mugineic acid (MA; (2S, 2′S, 3′S, 3″S)-N-[3-carboxy-3-(3-carboxy-3-hydroxypropylamino)-2-hydroxypropyl]-azetidine-2-carboxylic acid), a multidentate complexing agent, is exuded by the roots of graminaceous plants (e.g. barley) growing under Fe-deficient conditions. The nature of the interactions of MA with Fe (hydr)oxide minerals in soils is thus of considerable practical importance. To examine the availability of MA in dissolving Fe (hydr) oxides, we investigated the amounts of Fe dissolved from 24 samples of Fe (hydr)oxides by 100 μM MA (FeMA) and 200 mM NH4-oxalate (Feo). The Feo values were much larger than the FeMA ones, though the crystallinity of the Fe (hydr)oxides was a significant factor. For Fe (hydr)oxides consisting of goethite, hematite, ferrihydrite, and their mixture, FeMA increased with the increase of Feo, indicating that FeMA would be correlated with FeD, that is the amount of short-range ordered Fe minerals including ferrihydrite. For goethite, hematite, magnetite, maghemite, and lepidocrocite with a high crystallinity, MA was relatively ineffective in dissolving Fe, although a part of crystalline magnetite, maghemite, and lepidocrocite could be dissolved by NH4-oxalate. For soils containing significant amounts of magnetite, maghemite, lepidocrocite, it is unlikely therefore that Feo would be a useful indicator of plant-available Fe.
AB - Mugineic acid (MA; (2S, 2′S, 3′S, 3″S)-N-[3-carboxy-3-(3-carboxy-3-hydroxypropylamino)-2-hydroxypropyl]-azetidine-2-carboxylic acid), a multidentate complexing agent, is exuded by the roots of graminaceous plants (e.g. barley) growing under Fe-deficient conditions. The nature of the interactions of MA with Fe (hydr)oxide minerals in soils is thus of considerable practical importance. To examine the availability of MA in dissolving Fe (hydr) oxides, we investigated the amounts of Fe dissolved from 24 samples of Fe (hydr)oxides by 100 μM MA (FeMA) and 200 mM NH4-oxalate (Feo). The Feo values were much larger than the FeMA ones, though the crystallinity of the Fe (hydr)oxides was a significant factor. For Fe (hydr)oxides consisting of goethite, hematite, ferrihydrite, and their mixture, FeMA increased with the increase of Feo, indicating that FeMA would be correlated with FeD, that is the amount of short-range ordered Fe minerals including ferrihydrite. For goethite, hematite, magnetite, maghemite, and lepidocrocite with a high crystallinity, MA was relatively ineffective in dissolving Fe, although a part of crystalline magnetite, maghemite, and lepidocrocite could be dissolved by NH4-oxalate. For soils containing significant amounts of magnetite, maghemite, lepidocrocite, it is unlikely therefore that Feo would be a useful indicator of plant-available Fe.
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UR - http://www.scopus.com/inward/citedby.url?scp=0031715290&partnerID=8YFLogxK
U2 - 10.1080/00380768.1998.10414453
DO - 10.1080/00380768.1998.10414453
M3 - Article
AN - SCOPUS:0031715290
VL - 44
SP - 305
EP - 313
JO - Soil Science and Plant Nutrition
JF - Soil Science and Plant Nutrition
SN - 0038-0768
IS - 3
ER -