Many rivers to cross: the journey of zinc from soil to seed

Olsen, Lene Irene; Palmgren, Michael G.

doi:10.3389/fpls.2014.00030

Cited by 164 publications

(143 citation statements)

References 74 publications

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“…Transport of mineral elements from soil to different organs and tissues of plants requires different types of transporters (Hall and Williams, 2003;Nevo and Nelson, 2006;Yokosho et al, 2009;Olsen and Palmgren, 2014;Sasaki et al, 2016), which include the zincregulated transporters, iron-regulated transporter-like protein family; the natural resistance-associated macrophage protein (Nramp) family of transporters; the multidrug and toxic compound extrusion protein transporters; the heavy metal ATPase transporters; the oligopeptide transporters family; the ATP-binding cassette family of transporters; and the cationdiffusion facilitator family of transporters. Among them, Nramp represents a transporter family for metal ion in all organisms including bacteria, animals, and plants (Curie et al, 2000;Nevo and Nelson, 2006).…”

mentioning

confidence: 99%

The HvNramp5 Transporter Mediates Uptake of Cadmium and Manganese, But Not Iron

Yamaji²,

Yamane³

et al. 2016

Plant Physiol.

186

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ORCID IDs: 0000-0001-8818-5203 (K.S.); 0000-0003-3411-827X (J.F.M.).The Natural Resistance Associated Macrophage Protein (Nramp) represents a transporter family for metal ions in all organisms. Here, we functionally characterized a member of Nramp family in barley (Hordeum vulgare), HvNramp5. This member showed different expression patterns, transport substrate specificity, and cellular localization from its close homolog in rice (Oryza sativa), OsNramp5, although HvNramp5 was also localized to the plasma membrane. HvNramp5 was mainly expressed in the roots and its expression was not affected by Cd and deficiency of Zn, Cu, and Mn, but slightly up-regulated by Fe deficiency. Spatial expression analysis showed that the expression of HvNramp5 was higher in the root tips than that in the basal root regions. Furthermore, analysis with laser microdissection revealed higher expression of HvNramp5 in the outer root cell layers. HvNramp5 showed transport activity for both Mn 2+ and Cd 2+ , but not for Fe 2+ when expressed in yeast. Immunostaining with a HvNramp5 antibody showed that this protein was localized in the root epidermal cells without polarity. Knockdown of HvNramp5 in barley resulted in a significant reduction in the seedling growth at low Mn supply, but this reduction was rescued at high Mn supply. The concentration of Mn and Cd, but not other metals including Cu, Zn, and Fe, was decreased in both the roots and shoots of knockdown lines compared with the wild-type barley. These results indicate that HvNramp5 is a transporter required for uptake of Mn and Cd, but not for Fe, and that barley has a distinct uptake system from rice.

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mentioning

confidence: 99%

The HvNramp5 Transporter Mediates Uptake of Cadmium and Manganese, But Not Iron

Yamaji²,

Yamane³

et al. 2016

Plant Physiol.

186

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“…Olsen and Palmgren (2014) present an overview of the processes occurring in the transport of Zn from uptake at the plasma membrane of root cells to accumulation in the seed, reporting what we know in Arabidopsis to what we are starting to learn in cereals. The mechanisms involved in phloem unloading and post-phloem movement of Zn in the developing seed are discussed with respect to the apoplastic barriers found in the Arabidopsis seed.…”

Section: Micronutrient Storagementioning

confidence: 99%

From soil to seed: micronutrient movement into and within the plant

2014

Frontiers Research Topics

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The ability of roots to obtain micronutrients from the soil and to deliver these to the aerial tissues-including seeds-is essential to ensure that the shoot has the resources it needs to function effectively. However, plants need to control several steps during the journey from soil to seed, including uptake, transport, remobilization and storage. A better comprehension of the relative contribution of these processes, together with their overall coordination, is necessary for a more complete understanding of plant metal homeostasis and for the development of successful biofortification strategies. This Research Topic aims at addressing some of the most recent advances in micronutrient movement from soil to seed and to provide an overview of different approaches that can be used to generate micronutrient-efficient and biofortified plants. Here, we highlight some of the major points arising from these reports. MICRONUTRIENT UPTAKE AND TRANSPORTAs the first step in the pathway of elements reaching shoots and seeds, micronutrient uptake from the soil is arguably the most studied aspect of metal and metalloid homeostasis. As such, identifying the mechanisms and proteins involved in transport into roots from the rhizosphere was key to further studies on metal movement within the plant. Iron (Fe) acquisition in plants, for example, has long been thought to be based on a reduction strategy (strategy I) in non-Poaceae but a chelation strategy (strategy II) in Poaceae species; however, recent data suggest that certain monocots, such as rice, (Oryza sativa) can combine characteristics of both. Ricachenevsky and Sperotto (2014) suggest two models of how these strategies were shaped through evolutionary time, and propose that the combined strategy might be common to more species than just rice. Jain et al. (2014) review the roles of Fe(III)-reductases, discussing Fe and copper (Cu) reduction at the rhizoplane, and the proposed roles for the reductases at leaf cell surfaces and in subcellular compartments.When considering transport of micronutrients from the soil to the seed we need to understand the contribution of long distance transport, tissue and intercellular transport and the role of organelles. It is also important to consider the transport of toxic metals such as cadmium (Cd). The vacuole is a pivotal compartment in storing heavy metals (both essential and toxic), but also makes a substantial contribution to long-distance transport. Peng and Gong (2014) discuss the concept of vacuolar sequestration capacity (VSC), proposing it plays the role of a "buffering pool" not only controlling metal accumulation in cells but also dynamically mediating transport of metals over long distances. Certainly chelators such as phytochelatins and nicotianamine play an important role in regulating VSC. In rice, the membrane transporters VIT1 and VIT2 also appear to have a key role in long distance transport of zinc (Zn) and Fe between source (flag leaves) and sink organs (seeds) via the modulation of flag leaf Zn and Fe VSC. Other trans...

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“…Members of the CDF (Cation Diffusion Facilitator) family are found in bacteria, fungi, plants and animals and function in transporting metals from the cytoplasm, either by efflux to the extracellular organelles or storage compartments [51]. MTP1, one of the twelve predicted CDF family members in Arabidopsis, has been characterized to date [52].…”

Section: Cdf Familymentioning

confidence: 99%

“…ZIP1 and ZIP3 are root-specific while ZIP4 mRNA accumulates in both the roots and shoots of Zn-deficient plants. Several ZIP proteins have been characterized in rice [51]. OsZIP4 mRNA accumulates in Zn-deficient shoots and roots, and presumably functions to transport Zn across the plasma membrane into the cytoplasm [43].…”

Section: Zip Familymentioning

confidence: 99%

Genetic Processes of Iron and Zinc Accumulation in Edible Portion of Crops and Their Agro-Biofortification: A Review

Jing¹,

Yang²,

Li³

et al. 2017

AJAF

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Iron (Fe) and zinc (Zn) are essential micronutrient for both human and plants, but Fe and Zn deficiency is prevalent in the world especially developing countries including India and China. Biofortification is considered the most promising approach to alleviate Fe and Zn malnutrition. Thus this study was mainly conducted to review the recent progresses on the strategies of the processes affecting Fe and Zn accumulation in edible portion of crops at genetic and physiological levels. While agricultural approaches are useful to gain Fe and Zn enriched cereals, therefore agro-biofortification of Fe and Zn by agricultural approaches was also reviewed for possible solution in intensive agriculture system.

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Many rivers to cross: the journey of zinc from soil to seed

Cited by 164 publications

References 74 publications

The HvNramp5 Transporter Mediates Uptake of Cadmium and Manganese, But Not Iron

The HvNramp5 Transporter Mediates Uptake of Cadmium and Manganese, But Not Iron

From soil to seed: micronutrient movement into and within the plant

Genetic Processes of Iron and Zinc Accumulation in Edible Portion of Crops and Their Agro-Biofortification: A Review

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