Diurnal rhythm of release of phytosiderophores and uptake rate of zinc in iron-deficient wheat

Zhang, Fusuo; Römheld, Volker; Marschner, H.

doi:10.1080/00380768.1991.10416935

Cited by 129 publications

(67 citation statements)

References 23 publications

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“…This is attributed to the high secretion of PS during that period (Takagi et al, 1984;Marschner et al 1986). The same diurna1 rhythm of PS release by Fe-deficient or Zn-deficient plants has been reported for wheat (Zhang et al, 1991). When FeDMA was provided as an Fe source to corn plants, the translocation rate was equal in the morning and in the evening.…”

Section: Discussionmentioning

confidence: 48%

“…The most common PS are MA, DMA, and epi-hydroxymugineic acid (Kawai et al, 1988). The secretion of PS from Fe-deficient barley and wheat roots was found to occur within a specific period of 4 to 6 h, which usually begins about 2 h after the onset of light (Takagi et al, 1984;Marschner et al, 1986;Zhang et al, 1991). It was later suggested that temperature, rather than a light signal, is the trigger for the initiation of MA release ; however, it has not been clarified yet whether other plant species share the same diurnal rhythm of PS release.…”

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confidence: 99%

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The Role of Ligand Exchange in the Uptake of Iron from Microbial Siderophores by Gramineous Plants

et al. 1996

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Section: Discussionmentioning

confidence: 48%

mentioning

confidence: 99%

The Role of Ligand Exchange in the Uptake of Iron from Microbial Siderophores by Gramineous Plants

et al. 1996

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“…Grasses can absorb Fe via a nondissociated Fe(II1)-phytosiderophore complex (Romheld and Marschner, 1986), whereas Zn is believed to enter plant roots only as a nonchelated divalent cation (Halvorson and Lindsay, 1977), which has been confirmed by numerous observations showing that Zn uptake is highly dependent on its free ion activity (Bell et al, 1991;Norvell and Welch, 1993). The beneficia1 effect of chelators in Zn acquisition, therefore, has been restricted to Zn mobilization, whereas Zn uptake is actually inhibited by high chelator concentrations (Laurie et al, 1991;Zhang et al, 1991).…”

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confidence: 62%

Roots of Iron-Efficient Maize also Absorb Phytosiderophore-Chelated Zinc

1996

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To investigate the recognition of Zn-phytosiderophores by the putative Fe-phytosiderophore transporter in maize (Zea mays L.) roots, short-term uptake of 65Zn-labeled phytosiderophores was compared in the Fe-efficient maize cultivar Alice and the maize mutant ys1 carrying a defect in Fe-phytosiderophore uptake. In ys1, uptake and translocation rates of Zn from Zn-phytosiderophores were one-half of those in Alice, but no genotypical difference was found in Zn uptake and translocation from other Zn-binding forms. In ys1 and in tendency also in Alice, Zn uptake decreased with increasing stability constant of the chelate in the order: ZnSO4 [greater than or equal to] Zn-desferrioxamine > Zn-phytosiderophores > Zn-EDTA. Adding a 500-fold excess of free phytosiderophores over Zn to the uptake solution depressed Zn uptake in ys1 almost completely. In uptake studies with double-labeled 65Zn-14C-phytosiderophores, ys1 absorbed the phytosiderophore at similar rates when supplied as a Zn-chelate or the free ligand. By contrast, in Alice 14C-phytosiderophore uptake from the Zn-chelate was 2.8-fold higher than from the free ligand, suggesting that Alice absorbed the complete Zn-phytosiderophore complex via the putative plasma membrane transporter for Fe-phytosiderophores. We propose two pathways for the uptake of Zn from Zn-phytosiderophores in grasses, one via the transport of the free Zn cation and the other via the uptake of nondissociated Zn-phytosiderophores.

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“…Release of phytosiderophores is a well-known phenomenon occurring not only under Fe de®ciency, but also under Zn de®ciency (Zhang et al, 1989;Cakmak et al, 1994) and is involved in mobilization of Zn both in the rhizosphere (Treeby et al, 1989) and from the root cell walls (Zhang et al, 1991). Under Fe de®ciency, the release rate of phytosiderophores was closely associated with the differences in sensitivity to Fe de®ciency among and within cereal species (Takagi et al, 1984;Marschner et al, 1986;Jolley and Brown, 1989).…”

Section: Phytosiderophore Releasementioning

confidence: 99%

“…Recently, von Wiren et al (1996) reported that release rate of phytosiderophores from roots did not differ among maize, but the lines greatly differed in their capacity to take up Zn-chelated phytosiderophore and translocate it from roots into shoots. Phytosiderophores are also effective in mobilizing Zn from cell walls (Zhang et al, 1991) where a substantial proportion of total Zn in plants is located (Schmid et al, 1965). Possibly, Zn can also be translocated within plants as phytosiderophore complexes to sites having high demand for Zn (Welch, 1995).…”

Section: Phytosiderophore Releasementioning

confidence: 99%

Zinc deficiency as a practical problem in plant and human nutrition in Turkey: A NATO-science for stability project

Çakmak¹,

Kalaycı²,

Ekiz³

et al. 1999

Field Crops Research

277

152

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Zinc (Zn) de®ciency is a critical nutritional problem for plants and humans in Turkey. About 14 Mha of cropped land in Turkey are known to be Zn de®cient, particularly cereal growing areas of Anatolia. In 1993, a joint research project was started in Turkey with the ®nancial support of the NATO-Science for Stability Programme to select and characterize cereal genotypes with high yield and/or high Zn accumulation in grain under de®cient supply of Zn.Field, greenhouse and growth chamber experiments were carried to study morphological, physiological and genetic factors determining the bases of genotypical differences in Zn ef®ciency among cereal species and within cultivars of wheat. Among the cereals, rye had particularly high Zn ef®ciency (high yield under Zn de®ciency). There were large genotypical differences among wheat lines. High Zn ef®ciency was closely associated with enhanced capacity of some lines to take up Zn from soils, but not with increased Zn accumulation per unit dry weight of shoot or grain. Measurement of Zn-containing superoxide dismutase activity in leaves revealed that an ef®cient utilization of Zn at the tissue or cellular level is an additional major factor involved in Zn ef®ciency of cereals.Zinc present in grains from Anatolia seems to be not bioavailable. Phytate : Zn molar ratios in grains, a widely accepted predictor of Zn bioavailability, were extremely high and ranged between 95 and 216 for crops grown severely on Zn-de®cient soils of Central Anatolia. In the studies concerning determination of Zn nutritional status of school children in Southeastern Anatolia, most children were found to be of shorter stature and had very low levels of Zn (<100 mg kg À1 ) in hair. #

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Diurnal rhythm of release of phytosiderophores and uptake rate of zinc in iron-deficient wheat

Cited by 129 publications

References 23 publications

The Role of Ligand Exchange in the Uptake of Iron from Microbial Siderophores by Gramineous Plants

The Role of Ligand Exchange in the Uptake of Iron from Microbial Siderophores by Gramineous Plants

Roots of Iron-Efficient Maize also Absorb Phytosiderophore-Chelated Zinc

Zinc deficiency as a practical problem in plant and human nutrition in Turkey: A NATO-science for stability project

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