Biochemical and physiological changes in jack bean under mycorrhizal symbiosis growing in soil with increasing Cu concentrations

Andrade, Sara Adrián López de; Gratão, Priscila Lupino; Azevedo, Ricardo Antunes; Silveira, Adriana Parada Dias da; Schiavinato, Marlene Aparecida; Mazzafera, Paulo

doi:10.1016/j.envexpbot.2009.11.009

Cited by 118 publications

(74 citation statements)

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“…para os tratamentos de Cu na solução nutritiva (Figura 3). Andrade et al (2010), trabalhando com a mesma espécie em solo que recebeu quantidades crescentes de Cu, também verificaram potencial fitoextrator. De acordo com os autores, a habilidade do feijão-de-porco em acumular o Cu foi relacionada à produção de fitoquelatinas no tecido foliar, que reduzem a concentração de metal livre no citosol, limitando sua solubilidade e reatividade (Lasat, 2002;Oliva et al, 2010).…”

Section: Resultsunclassified

Fitoextração de cobre por espécies de plantas cultivadas em solução nutritiva

et al. 2011

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ResumoDentre as tecnologias para remediação de solos contaminados, destaca-se a fitoextração. Uma etapa importante nesta estratégia é a seleção de plantas adequadas para áreas que necessitam de recuperação. O objetivo deste trabalho foi avaliar o potencial fitoextrator de cobre (Cu) por plantas de sorgo (Sorghum bicolor), milheto (Pennisetum glaucum), crotalária (Crotalaria juncea) e feijão-de-porco (Canavalia ensiformis). O delineamento experimental foi em blocos ao acaso e os tratamentos foram constituídos de quatro concentrações de Cu (0,8; 3,9; 19,7 e 98,4 µmol L -1 ) na solução nutritiva. Após 30 dias do início dos tratamentos, foram realizadas medidas de trocas gasosas em folhas completamente expandidas. Em seguida, as plantas foram coletadas, separadas em parte aérea e sistema radicular para avaliação de crescimento e acúmulo de Cu. O tratamento com 98,4 µmol L -1 de Cu na solução nutritiva inibiu marcadamente o acúmulo de massa seca da parte aérea das raízes das plantas. A condutância estomática, transpiração e assimilação de CO 2 não foram alteradas até o tratamento com 19,7 µmol L -1 de Cu. O teor e acúmulo de Cu nas plantas foram proporcionais à adição do metal na solução nutritiva, porém, foram muito mais elevados no sistema radicular do que na parte aérea. O acúmulo preferencial de Cu nas raízes, embora diminua o transporte para a parte aérea e contribua para a tolerância das plantas ao metal, é limitante para o emprego da fitoextração. O feijão-de-porco teve maior concentração, acúmulo e transporte de Cu para a parte aérea, sendo uma espécie com potencial para ser utilizada em programas de fitorremediação de Cu.Palavras-chave: descontaminação do solo, Canavalia ensiformis, Pennisetum glaucum, Sorghum bicolor, Crotalaria juncea. Copper phytoextraction by different plant species grown in nutrient solution AbstractAmong the technologies for remediation of contaminated soils, the phytoremediation is a feasible approach. The first step towards to the implementation of this strategy is the selection of plants with potential to be used in areas that need remediation. The aim of this study was to evaluate the potential for phytoextraction of copper (Cu) by sorghum (Sorghum bicolor), pearl millet (Pennisetum glaucum), crotalaria (Crotalaria juncea) and jack beans (Canavalia ensiformis). The experimental design was in randomized blocks, and treatments consisted of 0.8, 3.9, 19.7 and 98.4 µmol L -1 of Cu in the nutrient solution. Thirty days after the beginning of the treatments, the leaf gas exchange was measured in mature leaves. Then, the plants were harvested, separated into shoot and root system for determining dry matter and Cu accumulation. The treatment with 98.4 µmol L -1 of Cu markedly impaired shoot and root growth. Stomatal conductance, leaf transpiration rate and net CO 2 assimilation were not affected until the treatment with 19.7 µmol L -1 of Cu in the nutrient solution. Cu content and accumulation in plant tissues were well related to the metal concentration in the nutrient solution, with high...

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Section: Resultsunclassified

Fitoextração de cobre por espécies de plantas cultivadas em solução nutritiva

et al. 2011

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“…Nemours study reported that one of the important heavy metal accumulation mechanisms could be the GSH-phytochelatins-mediated metal resistance [22]. Glutathione (GSH) plays several roles in cell metabolism such as redox state regulation, oxidative stress control, and protection against xenobiotics and heavy metals.…”

Section: Glutathione and Phytochelatinsmentioning

confidence: 99%

“…In this experiment, under Cu and Cd stress, GSH increased sharply in the first several days after exposure in the nonaccumulator, but the PC content changed slowly. Mendoza-Cózatl and Moreno-Sánchez [22] observed that the rate of GSH synthesis under unstressed conditions is mainly controlled by the demand for GSH. Under Cd stress, another GSH-consuming branch, the PC was activated, thus increasing GSH demand.…”

Section: Glutathione and Phytochelatinsmentioning

confidence: 99%

Cu and Cd induced Cytotoxicity Involving Lipid Peroxidation and Sulfhydryl Compounds in the Hyperaccumulator and Nonaccumulator Varieties of Commelina Communis

Hai-ou¹

2013

IJESD

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Abstract-The ability to accumulate Cu and Cd was investigated in Cu hyperaccumulator and nonaccumulator varieties of Commelina communis. Furthermore, the role of malondialdehyde (MDA), glutathione (GSH), and phytochelatin (PC) in the detoxification mechanisms used by the hyperaccumulator C. communis to cope with heavy metals were investigated. Results showed that Cu and Cd contents of both leaves and roots in the hyperaccumulator were higher than those in the nonaccumulator. However, the hyperaccumulator variety could have a more powerful ability to transport Cu and Cd from roots to shoots, thus decreasing the toxicity risk. Meanwhile, the MDA, GSH, and PC contents in the hyperaccumulator were significantly lower than those in the nonaccumulator under Cu and Cd stress, indicating that the former can utilize these sulfhydryl compounds to reduce toxicity caused by metal ions. Thus, the hyperaccumulator can tolerate heavy metal-induced toxicity better than the nonaccumulator.Index Terms-Heavy metals, malondialdehyde, glutathione, phytochelatin. I. INTRODUCTIONCu is an essential micronutrient for plants, a component of several electron transport enzymes, and is involved in catalyzing redox reactions in mitochondria and chloroplasts [1]. However, Cu also induces toxicity at tissue concentrations slightly above its optimal levels [2]. It can produce a mass of reactive oxygen species, damage cell membranes, and accumulate peroxide [3]. Glutathione (GSH) plays an important role in the heavy metal detoxification mechanism of plants [4]. GSH is a ubiquitous molecule with several roles in cell metabolism, including reactive oxygen species processing, redox state regulation, transport of amino acids, and sulfur storage [5], [6]. A function of GSH could be the chelation of toxic Cd (II) ions during their transport through the cytoplasm [7]. GSH is also used to synthesize phytochelatin (PC) [8]- [10]. Numerous physiological studies have indicated that the roles of PC include heavy metal detoxification [11] and maintenance of the homeostasis of intracellular levels of essential metal ions [12]. Malondialdehyde (MDA) is often used as an indicator of Manuscript received January 14, 2013; revised March 14, 2013 Commelina communis is commonly known in China as an annual multibranched herb with erect stems in its upper part and creeping stems in its lower part. Many studies have been performed to illustrate the hyperaccumulating mechanism of the hyperaccumulator variety of C. communis. Reports that describe the reaction of MDA, GSH, and PC to Cu, however, number much less. Moreover, scholars widely hypothesize that the hyperaccumulator can accumulate more than one kind of heavy metal. As such, two of varieties of C. communis were studied in our experiment as to whether or not they could also accumulate Cd in addition to Cu. The movement of MDA, GSH, and PC in the two varieties was further investigated under Cu-and Cd-induced stress. The study is an attempt to understand the mechanism by which the hyperaccumulator variety can tolera...

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“…This latter effect results in a decrease in the transfer of potentially toxic elements from roots to shoots (JONER et al, 2000;CHRISTIE et al, 2004). AMF may also reduce heavy metal uptake by promoting the precipitation or chelation of elements in the rhizosphere (KALDORF et al, 1999) and by promoting morphological, physiological and molecular changes in host plants (ANDRADE et al, 2010). …”

Section: Agronomic Practices To Reduce the Toxicity Of Heavy Metals Imentioning

confidence: 99%

Heavy Metals in Vineyards and Orchard Soils

et al. 2017

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-The application of foliar fungicides in vineyards and orchards can increase soil concentration of heavy metals such as copper (Cu) and zinc (Zn), up to the toxicity threshold for fruit trees and cover crops. However, some agronomic practices, such as liming, addition of organic fertilizers, cultivation of soil cover crops and inoculation of young plants with arbuscular mycorrhizal fungi can decrease the availability and the potential of heavy metal toxicity to fruit trees. This review aims to compile and present information about the effects of increasing concentrations of heavy metals, especially Cu and Zn, on soils cultivated with fruit trees and provides some agronomic practices of remediation. Information about the sources of heavy metals found in soils cultivated with fruit trees are presented; mechanisms of absorption, transport, accumulation and potential toxicity to plants are described. Index terms: Trace element, phytotoxicity, growth, fruit trees. METAIS PESADOS EM SOLOS DE VINHEDOS E POMARESRESUMO -A aplicação de fungicidas foliares em vinhedos e pomares pode incrementar os teores de metais pesados, como o cobre (Cu) e o zinco (Zn), em solos e, quando em excesso, podem causar toxidez às frutíferas ou plantas de cobertura. Porém, algumas práticas agronômicas, como a calagem, adição de resíduos orgânicos, cultivo de plantas de cobertura do solo e inoculação de plantas jovens com fungos micorrízicos arbusculares (FMA) podem diminuir a disponibilidade e o potencial de toxidez de metais pesados às frutíferas. A presente revisão objetivou compilar e apresentar informações sobre os efeitos do aumento dos teores de metais pesados, especialmente, Cu e Zn, em solos cultivados com frutíferas e algumas práticas agronômicas de remediação. Ao longo do texto são apresentadas informações sobre as fontes de metais pesados, com enfase no Cu e Zn, em solos cultivados com frutíferas; mecanismos de absorção, transporte, acúmulo e potencial de toxidez às plantas. Além disso, são relatadas algumas práticas agronômicas viáveis para remediar o potencial de toxidez de metais pesados em solos cultivados com frutíferas. Com a adoção destas práticas se espera menor disponibilidade de metais pesados no solo, o que reduziria o potencial de toxidez às plantas, especialmente, em frutíferas jovens transplantadas em solos com alto teor de metais pesados, como o Cu e Zn, permitindo satisfatório crescimento, produção e composição de frutos. Termos para indexação: Elemento traço, fitotoxidez, crescimento, frutíferas.1 (Paper 226-15).

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Biochemical and physiological changes in jack bean under mycorrhizal symbiosis growing in soil with increasing Cu concentrations

Cited by 118 publications

References 46 publications

Fitoextração de cobre por espécies de plantas cultivadas em solução nutritiva

Fitoextração de cobre por espécies de plantas cultivadas em solução nutritiva

Cu and Cd induced Cytotoxicity Involving Lipid Peroxidation and Sulfhydryl Compounds in the Hyperaccumulator and Nonaccumulator Varieties of Commelina Communis

Heavy Metals in Vineyards and Orchard Soils

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