Transport and detoxification of manganese and copper in plants

Dučić, Tanja; Polle, Andrea

doi:10.1590/s1677-04202005000100009

Cited by 285 publications

(106 citation statements)

References 88 publications

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“…Furthermore, according to the anatomical changes and timing of appearance of the symptoms of Mn deficiency and toxicity observed here, we believe there are various mechanisms that act together to maintain the biochemical processes and structural plant apparatuses, resulting in different degrees of tissue organization. We also suggest that Mn detoxification of cells by activation of the antioxidant defense system (enzymatic or not), binding of Mn to complexing agents in the root system (phytochelatins, metallothioneins, histidine and nicotianamine) and subsequent deposition of Mn in the apoplast, reduction in long-distance transport of the metal-ligand complex (e.g., citrate or malate), and finally, storage inside the vacuoles (Ducic and Polle, 2005;Haydon and Cobbett, 2007), may all be more effective in the tolerant genotype, IACFoscarin 31, as pointed out by Lavres Jr. et al (2008.…”

Section: Resultsmentioning

confidence: 88%

Changes in the ultrastructure of soybean cultivars in response to manganese supply in solution culture

Lavres

Reis

Rossi

et al. 2010

Sci. agric. (Piracicaba, Braz.)

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The deleterious effects of Mn stress on many species have been studied, mainly concerning biochemical, physiological and growth parameters of plants. However, there are few studies relating the anatomical and ultrastructural changes in response to manganese (Mn) nutritional disorders, This study examined the leaf ultrastructure of Mn-inefficient (IAC-15, Santa Rosa) and Mn-efficient (IAC-Foscarin 31) soybean (Glycine max L.) genotypes in response to three rates of Mn (0.5, 2 and 200 μmol L -1 ) in the nutrient solution. Symptoms of Mn deficiency developed 12 days after transplanting in IAC-15 and Santa Rosa, followed by IAC-Foscarin 31 on the 15 th day. Only IAC-15 and Santa Rosa leaves showed symptoms of Mn toxicity. The Mn concentration in leaves ranged from 8.6 (deficiency) to 886.3 mg kg -1 d.w. (toxicity). There were no changes either in stomata length or stomata number per unit of leaf surface. Cytoplasm disorganization was observed in IAC-15 under Mn-excess. In this case, the cytoplasm was amorphous, densely stained and extensively disorganized, with increased vacuolation. Mn effects were not found in mitochondria and nucleus in any of the genotypes tested. Under all Mn concentrations, many lipid globules were observed in the IAC-15 chloroplasts. There was an increase in the number of plastids as well as in the size of starch grains within IAC-Foscarin 31 chloroplasts as Mn concentration in the nutrient solution increased. Genotypes had marked differences in the ultrastructure organization, mainly in leaf chloroplasts grown under conditions of both Mn deficiency and toxicity (the most sensitive genotype was IAC-15).

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Section: Resultsmentioning

confidence: 88%

Changes in the ultrastructure of soybean cultivars in response to manganese supply in solution culture

Lavres

Reis

Rossi

et al. 2010

Sci. agric. (Piracicaba, Braz.)

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“…Copper excess also interferes in the activity of several enzymes (Lombardi and Sebastiani, 2005) and in some aspects associated with photosynthesis, pigment synthesis, fatty acid and protein metabolism, respiration, N fixation processes and membrane integrity, among others (Ducić and Polle, 2005). Some chloroplast proteins and the enzymes glutamine synthase (GS) and ferredoxin-dependent glutamate synthase (Fd-GOGAT), involved in the assimilation of NH 4 + , are very susceptible to heavy metal toxicity, especially Fd-GOGAT to Cu excess (Demirevska-Kepova et al, 2004).…”

Section: Coppermentioning

confidence: 99%

“…Some chloroplast proteins and the enzymes glutamine synthase (GS) and ferredoxin-dependent glutamate synthase (Fd-GOGAT), involved in the assimilation of NH 4 + , are very susceptible to heavy metal toxicity, especially Fd-GOGAT to Cu excess (Demirevska-Kepova et al, 2004). Probably its most important effect is associated with the impairment of the photosynthetic electron transport system, promoting the production of radicals that initiate the reactions of the peroxidative chain, involving membrane lipids (Ducić and Polle, 2005). In addition, Cu excess can cause alterations in the source: sink relationship, diminishing the requirements for photosynthetic products and for products that regulate Calvin cycle enzymes (Maksymiec, 1997).…”

Section: Coppermentioning

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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“…Although not clear, it is also assumed that Mn acts as scavenger of O ÁÀ 2 and H 2 O 2 (Ducic and Polle 2005). Several studies also revealed that supplemental Mn plays an important role in the adaptive responses of plants under various environmental stresses.…”

Section: Introductionmentioning

confidence: 99%

Manganese-induced salt stress tolerance in rice seedlings: regulation of ion homeostasis, antioxidant defense and glyoxalase systems

Rahman

Hossain

Mahmud

et al. 2016

Physiol Mol Biol Plants

128

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Hydroponically grown 12-day-old rice (Oryza sativa L. cv. BRRI dhan47) seedlings were exposed to 150 mM NaCl alone and combined with 0.5 mM MnSO 4 . Salt stress resulted in disruption of ion homeostasis by Na ? influx and K ? efflux. Higher accumulation of Na ? and water imbalance under salinity caused osmotic stress, chlorosis, and growth inhibition. Salt-induced ionic toxicity and osmotic stress consequently resulted in oxidative stress by disrupting the antioxidant defense and glyoxalase systems through overproduction of reactive oxygen species (ROS) and methylglyoxal (MG), respectively. The saltinduced damage increased with the increasing duration of stress. However, exogenous application of manganese (Mn) helped the plants to partially recover from the inhibited growth and chlorosis by improving ionic and osmotic homeostasis through decreasing Na ? influx and increasing water status, respectively. Exogenous application of Mn increased ROS detoxification by increasing the content of the phenolic compounds, flavonoids, and ascorbate (AsA), and increasing the activities of monodehydroascorbate reductase (MDHAR), dehydroascorbate reductase (DHAR), superoxide dismutase (SOD), and catalase (CAT) in the salt-treated seedlings. Supplemental Mn also reinforced MG detoxification by increasing the activities of glyoxalase I (Gly I) and glyoxalase II (Gly II) in the salt-affected seedlings. Thus, exogenous application of Mn conferred salt-stress tolerance through the coordinated action of ion homeostasis and the antioxidant defense and glyoxalase systems in the salt-affected seedlings.

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Transport and detoxification of manganese and copper in plants

Cited by 285 publications

References 88 publications

Changes in the ultrastructure of soybean cultivars in response to manganese supply in solution culture

Changes in the ultrastructure of soybean cultivars in response to manganese supply in solution culture

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

Manganese-induced salt stress tolerance in rice seedlings: regulation of ion homeostasis, antioxidant defense and glyoxalase systems

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