Iron Acquisition by Phytosiderophores Contributes to Cadmium Tolerance

Meda, Anderson Rotter; Scheuermann, Enrico B.; Prechsl, Ulrich E.; Erenoğlu, B.; Schaaf, Gabriel; Hayen, Heiko; Weber, G.; Wirén, Nicolaus von

doi:10.1104/pp.106.094474

Cited by 125 publications

(98 citation statements)

References 48 publications

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“…With regard to toxic concentrations of metals, an enhanced release of phytosiderophores has also been reported for many plants that were grown in the presence of Cd, and the inhibition of Cd uptake via phytosiderophore chelation has been suggested as a mechanism to protect plant roots from Cd toxicity (Hill et al 2002;Murata et al 2006;Aoyama et al 2009). Nevertheless, Meda et al (2007) suggested that phytosiderophores did not interfere with Cd uptake but improved Fe absorbency of plant cells during Cd stress by bypassing Cd inhibition with Fe uptake. Thus, the lowest Cd accumulation in HA63 cultivar could be explained accordingly.…”

Section: Discussionmentioning

confidence: 99%

“…(Murata et al 2006;Aoyama et al 2009). Furthermore, Meda et al (2007) suggested that phytosiderophoremediated Fe acquisition could improve Fe uptake in the presence of Cd and thereby provide an advantage under the Cd stress. Regulation of phytochelatins, ABC transporters and phytosiderophores were therefore investigated here in four rice cultivars.…”

Section: Introductionmentioning

confidence: 99%

“…Recent researches indicated that the transcript levels of PCS (phytochelatin synthase), ABC (ATPbinding cassette), and YS (iron-phytosiderophore transporter) genes correlate with the levels of plant resistance to heavy metals (Cobbett 2000;Metwally et al 2003;Eichhorn et al 2006;Murata et al 2006;Meda et al 2007;Mendoza-Cozatl et al 2008;Aoyama et al 2009). Previous studies revealed that the synthesis of phytochelatins (PCs), glutathione derived metalbinding peptides, represents a major detoxification mechanism for Cd ions in various species (Cobbett 2000;Zhang et al 2010a).…”

Section: Introductionmentioning

confidence: 99%

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Comparative study of four rice cultivars with different levels of cadmium tolerance

Xiao

Zhang

et al. 2012

Biologia

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Cadmium (Cd) has been identified as a significant pollutant due to its high solubility in water and soil and high toxicity to plants and animals. Rice, as one of the most important food crops, is grown in soils with variable levels of Cd and therefore, is important to discriminate the Cd tolerance of different rice cultivars to determine their suitability for cultivation in Cd-contaminated soils. This study investigates the primary mechanisms employed by four rice cultivars in attaining Cd tolerance. HA63 cultivar reduces Cd uptake by increasing Fe absorption through activation of phytosiderophores. T3028 cultivar accumulates the highest level of Cd in leaves while also activating its reactive oxygen species (ROS) scavenging system, including antioxidant enzymes and phytochelatins. In some rice cultivars (such as HA63), a cyanide-resistant respiration mechanism, important in Cd detoxification, was also promoted under the Cd stress. In conclusion, different rice cultivars may adopt different biochemical strategies and respond with different efficiency to Cd stress.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Comparative study of four rice cultivars with different levels of cadmium tolerance

Xiao

Zhang

et al. 2012

Biologia

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“…Cadmium exposure also induced the formation of numerous root hairs in both Arabidopsis and tobacco control plants, as well as in the tga3-2 mutant line, whereas the formation of root hairs in BjCdR15-expressing plants was comparable with that of cadmium-untreated plants. As cadmium has inhibitory effects on water and mineral nutrient uptake (Deckert, 2005;Meda et al, 2007), the normal development of roots in plants overexpressing BjCdR15 may represent an adaptive response, in part accounting for the observed increase in cadmium tolerance, maximizing the ability of the root system to uptake water and mineral nutrients even in the presence of cadmium. Conversely, the root structural changes shown by control and tga3-2 plants exposed to cadmium may be interpreted as a symptom of cadmium toxicity.…”

Section: Researchmentioning

confidence: 99%

The Brassica juncea BjCdR15, an ortholog of Arabidopsis TGA3, is a regulator of cadmium uptake, transport and accumulation in shoots and confers cadmium tolerance in transgenic plants

et al. 2009

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Summary• A bZIP transcription factor from Brassica juncea (BjCdR15) was isolated by the cDNA-amplified fragment length polymorphism technique after cadmium treatment. Sequence analysis indicated high similarity between BjCdR15 and Arabidopsis TGA3. In Arabidopsis, TGA3 transcription is also induced by cadmium; hence, we investigated whether BjCdR15 is involved in cadmium tolerance and whether it can functionally replace TGA3 protein in Arabidopsis tga3-2 mutant plants.• BjCdR15 expression was detected mainly in the epidermis and vascular system of cadmium-treated plants, and increased in roots and leaves after cadmium treatment. The overexpression of BjCdR15 in Arabidopsis and tobacco enhanced cadmium tolerance: overexpressing plants showed high cadmium accumulation in shoots. Conversely, Arabidopsis tga3-2 mutant plants showed high cadmium content in roots and inhibition of its transport to the shoot.• We demonstrated that BjCdR15 can functionally replace TGA3: in 35S:: BjCdR15-tga3-2 plants, the long-distance transport of cadmium from root to shoot was restored and these plants showed an increased cadmium content in shoots compared with all other assays. In addition, BjCdR15 ⁄ TGA3 regulated the synthesis of phytochelatin synthase and the expression of several metal transporters.• The results indicate that BjCdR15 ⁄ TGA3 transcription factors play a crucial role in the regulation of cadmium uptake by roots and in its long-distance root to shoot transport. BjCdR15 ⁄ TGA3 may thus be considered as useful candidates for potential biotechnological applications in the phytoextraction of cadmium from polluted soils.

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“…Plant tolerance and/or resistance to metallic stress can be associated with one or more mechanisms, such as: (i) the excretion of chelating compounds that reduce the availability of the metal in the soil or water; (ii) the exclusion of the metal through selective absorption of elements; (iii) the retention of the metal in roots, preventing its translocation to the aerial part; (iv) the chelation or sequestration of heavy metals by ligands, compartmentalization, biotransformation and mechanisms of cellular repair; (v) the development of enzymes tolerant to the metal (Hall, 2002;Cobbett and Goldsbrough, 2002;Patra et al, 2004); (vi) the increase of production of intracellular compounds linked to the metal (Sharma and Dietz, 2006); (vii) the immobilization of the metal in the cellular wall (Cosio et al, 2005); (viii) homeostatic cellular mechanisms to regulate the concentration of metal ions inside the cell (Benavides et al, 2005); (ix) induction of heat-shock proteins (Heckathorn et al, 2004); (x) release of phenols from roots (Jung et al, 2003); (xi) the increase of tolerance to mineral deficiency or the decrease of nutritional requirements; (xii) the increase in absorption of certain macronutrients; and (xiii) the development of the capacity to absorb and to use minerals in the presence of heavy metals (Meda et al, 2007). As a result of these tolerance and/or resistance mechanisms (alone or in combination), some plants can grow in environments contaminated with metals where other species do not survive (Hall, 2002).…”

Section: Mechanisms Of Resistance or Tolerance To Metals In Plantsmentioning

confidence: 99%

Tolerance and prospection of phytoremediator woody species of Cd, Pb, Cu and Cr

Almeida

Valle

Mielke

et al. 2007

Braz. J. Plant Physiol.

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High concentrations of Cd, Pb, Cu and Cr can cause harmful effects to the environment. These highly toxic pollutants constitute a risk for aquatic and terrestrial life. They are associated with diverse bioavailable geochemical fractions, like the water-soluble fraction and the exchangeable fraction, and non-available fractions like those associated with the crystalline net of clays and silica minerals. Depending upon their chemical and physical properties we can distinguish different mechanisms of metal toxicity in plants, such as production of reactive oxygen species from auto-oxidation, blocking and/or displacement of essential functional groups or metallic ions of biomolecules, changes in the permeability of cellular membranes, reactions of sulphydryl groups with cations, affinity for reactions with phosphate groups and active groups of ADP or ATP, substitution of essential ions, induction of chromosomal anomalies and decrease of the cellular division rate. However, some plant species have developed tolerance or resistance to these metals naturally. Such evolution of ecotypes is a classic example of local adaptation and microevolution, restricted to species with appropriate genetic variability. Phytoremediator woody species, with (i) high biomass production, (ii) a deep root system, (iii) high growth rate, (iv) high capacity to grow in impoverished soils, and (v) high capacity to allocate metals in the trunk, can be an alternative for the recovery of degraded soils due to excess of metallic elements. Phytoremediation using woody species presents advantageous characteristics as an economic and ecologically viable system, making it an appropriate, practical and successful technology. Key-words: decontamination, heavy metals, hyperaccumulation, phytodegradation, phytostabilization, phytotoxicity Tolerância e prospecção de espécies lenhosas fitorremediadoras de Cd, Pb, Cu e Cr: Altas concentrações de Cd, Pb, Cu e Cr podem provocar efeitos danosos ao ambiente. Esses poluentes altamente tóxicos constituem um risco para a vida aquática e terrestre. Encontram-se associados às diversas frações geoquímicas biodisponíveis, a exemplo da fração solúvel em água e da fração trocável, e as não disponíveis como a fração associada à rede cristalina de argilas e de minerais silicatados. Conforme as suas propriedades químicas e físicas podem-se distinguir mecanismos diferentes de toxicidade de metais em plantas, tais como produção de espécies reativas de oxigênio pela auto-oxidação, bloqueio e, ou, deslocamento de grupos funcionais ou de íons metálicos essenciais de biomoléculas, mudanças na permeabilidade de membranas celulares, reações de grupos sulfidrílicos com cátions, afinidade para reações com grupos fosfatos e grupos ativos de ADP ou ATP, substituição de íons essenciais, indução de anomalias cromossomais e decréscimo da taxa de divisão celular. Várias espécies vegetais desenvolveram, naturalmente, tolerância ou resistência a esses metais. Essa evolução de ecótipos é exemplo clássico de adaptação local e de microevolução,...

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Iron Acquisition by Phytosiderophores Contributes to Cadmium Tolerance

Cited by 125 publications

References 48 publications

Comparative study of four rice cultivars with different levels of cadmium tolerance

Comparative study of four rice cultivars with different levels of cadmium tolerance

The Brassica juncea BjCdR15, an ortholog of Arabidopsis TGA3, is a regulator of cadmium uptake, transport and accumulation in shoots and confers cadmium tolerance in transgenic plants

Tolerance and prospection of phytoremediator woody species of Cd, Pb, Cu and Cr

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