Zinc Phytotoxicity

Chaney, Rufus L.

doi:10.1007/978-94-011-0878-2_10

Cited by 199 publications

(172 citation statements)

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“…Zinc toxicity in crops is far less widespread than Zn deficiency (Broadley et al 2007). Toxicity symptoms usually become visible at [Zn] leaf > 300 mg Zn kg −1 leaf DW, although some crops show toxicity symptoms at [Zn] leaf < 100 mg Zn kg −1 DW (Chaney 1993;Marschner 1995). However, Zn toxicity occurs in soils contaminated by mining and smelting activities, in agricultural soils treated with sewage sludge, and in urban and peri-urban soils enriched by anthropogenic inputs of Zn, especially in low-pH soils (Chaney 1993).…”

Section: Introductionmentioning

confidence: 99%

“…Toxicity symptoms usually become visible at [Zn] leaf > 300 mg Zn kg −1 leaf DW, although some crops show toxicity symptoms at [Zn] leaf < 100 mg Zn kg −1 DW (Chaney 1993;Marschner 1995). However, Zn toxicity occurs in soils contaminated by mining and smelting activities, in agricultural soils treated with sewage sludge, and in urban and peri-urban soils enriched by anthropogenic inputs of Zn, especially in low-pH soils (Chaney 1993). Silicon was recorded as an effective element for alleviation of Zn toxicity in some plant species (Cunha & Nascimento 2009;Kaya et al 2009;Song et al 2011).…”

Section: Introductionmentioning

confidence: 99%

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Effect of silicon application on Sorghum bicolor exposed to toxic concentration of zinc

et al. 2012

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The aim of this study was to determine the effect of exogenously applied Si on the growth and physiological parameters of sorghum [Sorghum bicolor (L.) Moench] cultivated in hydroponics with elevated zinc concentrations (75 µM and 150 µM Zn). Increased concentrations of Zn inhibited root growth and biomass production of roots and shoots. Application of Si individually showed a positive effect on root growth but negatively affected production of fresh and dry biomass of roots and shoots. On the other hand, silicon in combination with Zn significantly reduced the inhibitory effect of Zn on root growth but did not positively affect biomass production of roots and shoots. Accumulation of Zn in plant tissues increased with increasing Zn concentration in nutrient solution, but application of Si in combination with Zn did not significantly influence Zn accumulation in roots. Completely opposite results were found in Si accumulation in roots treated with Si in combination with Zn. Interaction of these ions resulted in considerable increase of Si accumulation in roots which almost doubled in comparison to individal Si treatment. Impact of Zn on the activity of some antioxidant enzymes was equivocal and differences were observed also between two Zn concentrations. Individual application of Si resulted in significant increase in the activity of all studied antioxidant enzymes but Si in combination with Zn mostly negatively affected their activity except the activity of catalase (CAT) which was the highest in roots grown in solution containing both Si and Zn ions. Comparing all obtained data we can assume that Si applied in combination with Zn did not significantly alleviate Zn toxicity in young sorghum except the growth of primary seminal root and further experiments are required for better understanding of their interaction.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of silicon application on Sorghum bicolor exposed to toxic concentration of zinc

et al. 2012

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“…9 O acúmulo de Zn em solo tratado com LE é preocupante, devido à toxicidade por este elemento ser mais frequente que com outros EPT's. 10 As maiores preocupações, com a toxicidade por EPT's, dizem respeito à redução da produtividade agrícola, devido aos efeitos fitotóxicos para as plantas, à entrada na cadeia alimentar com efeitos fitotóxicos para animais e seres humanos, alteração da atividade microbiana e contaminação de recursos hídricos. 6,11,12 A fitodisponibilidade do Zn no solo é controlada pelo teor total e, fundamentalmente, pelas formas químicas, que dependem de condições químicas, químico-físicas e físicas do solo, como pH, teor de nutrientes, capacidade de troca iônica, condutividade elétrica, potencial óxido-redutor, MO, textura, estrutura, densidade, porosidade, permeabilidade, fluxo de água, ar e temperatura.…”

Section: Introductionunclassified

Mudanças químicas e fitodisponibilidade de zinco estimada por método isotópico, em solo tratado com lodo de esgoto

et al. 2012

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Recebido em 15/9/11; aceito em 25/2/12; publicado na web em 15/6/12 CHEMICAL CHANGES AND ZINC PHYTOAVAILABILITY IN SEWAGE SLUDGE-AMENDED SOIL ESTIMATED BY THE ISOTOPIC METHOD. Zn availability in Red Latossol (Rhodic Ferralsol) of different pH amended with different rates of sewage sludge was studied by the isotopic 65 Zn L value method. Soil chemical properties were found to be altered by SS addition. Zn concentration and Zn derived from SS (ZnpfSS) in plant, and Zn phytoavailability (L value), were increased with increasing SS rates. The linear correlation coefficient of plant Zn with SS rates and with L value was significant at 1% probability. The L value proved an efficient method for predicting Zn phytoavailability in sewage sludge-amended soil with different pH under the soil conditions studied.Keywords: L value; 65 Zn; soil chemical properties. INTRODUÇÃOO tratamento de esgoto urbano produz o resíduo sólido chamado lodo de esgoto (LE), que, por sua riqueza em material orgânico (MO) e nutrientes, é um produto de interesse agrícola utilizado como fonte de nitrogênio e fósforo para as plantas.1,2 Quando as águas de esgoto domiciliares são também compostas por águas provenientes de área industrial, o lodo é mais rico em elementos potencialmente tóxicos (EPT), em particular o Zn, elemento essencial às plantas e animais, por estar presente em maior concentração no LE. 1,[3][4][5][6][7] O uso de LE na agricultura é restringido em normas específicas do Conselho Nacional do Meio Ambiente (CONAMA), a fim de se evitar a transferência de EPT para a cadeia alimentar.8 A aplicação repetida de lodo de esgoto para melhorar a estrutura do solo, os níveis de MO e de nutrientes no solo e o estado nutricional das plantas pode elevar os níveis de zinco no decorrer dos anos, o que requer atenção especial em relação ao ambiente.9 O acúmulo de Zn em solo tratado com LE é preocupante, devido à toxicidade por este elemento ser mais frequente que com outros EPT's.10 As maiores preocupações, com a toxicidade por EPT's, dizem respeito à redução da produtividade agrícola, devido aos efeitos fitotóxicos para as plantas, à entrada na cadeia alimentar com efeitos fitotóxicos para animais e seres humanos, alteração da atividade microbiana e contaminação de recursos hídricos. 6,11,12 A fitodisponibilidade do Zn no solo é controlada pelo teor total e, fundamentalmente, pelas formas químicas, que dependem de condições químicas, químico-físicas e físicas do solo, como pH, teor de nutrientes, capacidade de troca iônica, condutividade elétrica, potencial óxido-redutor, MO, textura, estrutura, densidade, porosidade, permeabilidade, fluxo de água, ar e temperatura. 13,14 A composição e as características dos LE variam em função da origem da água de esgoto e da tecnologia utilizada em sua obtenção. 1,3 Por outro lado, as propriedades químicas e químico-físicas dos solos são alteradas pela incorporação de LE e, consequentemente, podem alterar a disponibilidade e a fitodisponibilidade de nutrientes e EPT. 4,14 Os procedimentos convencionais utilizad...

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“…Zinc is an essential plant nutrient and is one of the most ubiquitous trace metals in soils. When it is present in excessive concentrations it is toxic to plants and it is therefore often regarded as a potentially toxic element (Chaney, 1994).…”

Section: Introductionmentioning

confidence: 99%

Arbuscular mycorrhiza can depress translocation of zinc to shoots of host plants in soils moderately polluted with zinc

Christie¹,

Li²,

Chen³

2004

Plant and Soil

200

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Zinc Phytotoxicity

Cited by 199 publications

References 59 publications

Effect of silicon application on Sorghum bicolor exposed to toxic concentration of zinc

Effect of silicon application on Sorghum bicolor exposed to toxic concentration of zinc

Mudanças químicas e fitodisponibilidade de zinco estimada por método isotópico, em solo tratado com lodo de esgoto

Arbuscular mycorrhiza can depress translocation of zinc to shoots of host plants in soils moderately polluted with zinc

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