Visualizing real time [11C]methionine translocation in Fe-sufficient and Fe-deficient barley using a Positron Emitting Tracer Imaging System (PETIS)

Nakanishi, Hiromi; Bughio, N.; Matsuhashi, Sachiko; Ishioka, Noriko‐Shigeta; Uchida, Hiroshi; Tsuji, Atsunori; Osa, A.; Sekine, T.; Kume, Tamikazu; Mori, Satoshi

doi:10.1093/jxb/50.334.637

Cited by 37 publications

(19 citation statements)

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“…This conclusion is supported by results of Nakanishi et al (1999) who demonstrated that methionine from the upper part of the plant is not used to synthesise mugineic acid in roots.…”

Section: Discussionmentioning

confidence: 52%

Influence of iron nutrition on sulphur uptake and metabolism in maize (Zea maysL.) roots

Astolfi

Zuchi

Cesco

et al. 2004

Soil Science and Plant Nutrition

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“…This conclusion is supported by results of Nakanishi et al (1999) who demonstrated that methionine from the upper part of the plant is not used to synthesise mugineic acid in roots.…”

Section: Discussionmentioning

confidence: 52%

Influence of iron nutrition on sulphur uptake and metabolism in maize (Zea maysL.) roots

Astolfi

Zuchi

Cesco

et al. 2004

Soil Science and Plant Nutrition

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“…In fact, data from the total sugars analysis show that sugar concentrations are mainly affected in the shoot tissues. In contrast, sugar levels were almost unaffected by both S and Fe deficiency in roots where PSs are effectively produced (Nakanishi et al 1999). This might be explained considering that Fe deficiency reduced the shoot to root ratio.…”

Section: Discussionmentioning

confidence: 99%

Sulfur starvation reduces phytosiderophores release by iron-deficient barley plants

Astolfi

Cesco

Zuchi

et al. 2006

Soil Science and Plant Nutrition

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The aim of the present study was to examine the effect of sulfur (S) supply on the response to iron (Fe) deficiency in graminaceous plants. Barley seedlings (Hordeum vulgare L. cv. Europa) were cultured hydroponically for 10 days at three S levels (0, 60 and 1200 µmol L −1 sulfate) with (+Fe) or without (−Fe) 100 µmol L Fe uptake that was as high as the level of S supply. The results support the view that S availability can influence either the release of phytosiderophores or the ability to take up Fe from an external solution.

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“…In the last few years, several studies were carried out on the formation of phytosiderophores (Higuchi et al, 1999;Nakanishi et al, 1999;Higuchi et al, 2001;), on their exudation (Singh et al, 2000;Negishi et al, 2002;Ma et al, 2003), and on the uptake mechanism of iron-siderophore complexes. Other studies focused on the effects of phytosiderophores on iron oxide solubility and dissolution.…”

Section: Introductionmentioning

confidence: 99%

Goethite Dissolution in the Presence of Phytosiderophores: Rates, Mechanisms, and the Synergistic Effect of Oxalate

et al. 2005

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The purpose of this study was the elucidation of the chemical mechanism of an important process in iron acquisition by graminaceous plants: the dissolution of iron oxides in the presence of phytosiderophores. We were particularly interested in the effects of diurnal root exudation of phytosiderophores and of the presence of other organic ligands in the rhizosphere of graminaceous plants on the dissolution mechanism. Phytosiderophores of the type 2¢-deoxymugineic acid (DMA) were purified from the root exudates of wheat plants (Triticum aestivum L. cv. Tamaro). DMA-promoted dissolution of goethite under steady-state and non-steady-state conditions and its dependence on pH, adsorbed DMA concentration, and the presence of the organic ligand oxalate were studied. We show that dissolution of goethite by phytosiderophores follows a surface controlled ligand promoted dissolution mechanism. We also found that oxalate, an organic ligand commonly found in rhizosphere soils, has a synergistic effect on the steady-state dissolution of goethite by DMA. Under non-steady-state addition of the phytosiderophore, mimicking the diurnal exudation pattern of phytosiderophore release, a fast dissolution of iron is triggered in the presence of oxalate. To investigate the efficiency of these mechanisms in plant iron acquisition, wheat plants were grown on a substrate amended with goethite as only iron source. The chlorophyll status of these plants was similar to ironfertilized plants and significantly higher than in plants grown in iron free nutrient solutions. This demonstrates that wheat can efficiently mobilize iron, even from well crystalline goethite that is usually considered unavailable for plant nutrition.

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Visualizing real time [11C]methionine translocation in Fe-sufficient and Fe-deficient barley using a Positron Emitting Tracer Imaging System (PETIS)

Cited by 37 publications

References 0 publications

Influence of iron nutrition on sulphur uptake and metabolism in maize (Zea maysL.) roots

Influence of iron nutrition on sulphur uptake and metabolism in maize (Zea maysL.) roots

Sulfur starvation reduces phytosiderophores release by iron-deficient barley plants

Goethite Dissolution in the Presence of Phytosiderophores: Rates, Mechanisms, and the Synergistic Effect of Oxalate

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