Boron toxicity

Nable, Ross O.; Bañuelos, Gary S.; Paull, J. G.

doi:10.1007/978-94-011-5580-9_12

Cited by 156 publications

(259 citation statements)

References 100 publications

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“…Junto com a coalescência surgiu uma clorose nas folhas, que evoluiu rapidamente para necrose e queda delas. A localização desses sintomas reflete a distribuição de B na maioria das espécies, com seu acúmulo ocorrendo nas partes da planta onde tem lugar o fluxo final da transpiração (Nable et al, 1997;Roessner et al, 2006). Manchas isoladas no limbo foliar também apareceram, principalmente com a aplicação de 16 mg kg -1 de B.…”

Section: Resultados and Discussãounclassified

“…Essa localização dos sintomas reflete a distribuição do B na maioria das plantas, uma vez que esse elemento tende a se acumular nas folhas em razão do fluxo transpiratório (Nable et al, 1997;Roessner et al, 2006). A concentração do B nos tecidos das partes necrosadas é elevada em comparação à sua concentração nos tecidos vizinhos (Salvador et al, 2003).…”

Section: Produção E Qualidade De Rosas Em Razão De Doses De Boro Apliunclassified

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Produção e qualidade de rosas em razão de doses de boro aplicadas no substrato

Júnior

Carvalho-Zanão

Fontes

et al. 2014

Rev. Bras. Ciênc. Solo

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RESUMOMuitos trabalhos têm demonstrado os efeitos da aplicação do boro (B) em variadas culturas; entretanto, poucos registros demonstram seus efeitos na produção de rosas. Objetivou-se com este experimento avaliar os efeitos de doses de B na produção e qualidade de rosas (Rosa hybrida cv. Shiny Terrazza ® ) em vaso. Os tratamentos foram cinco doses de B (0, 1, 4, 8 e 16 mg kg -1 ), aplicadas no substrato, em delineamento de blocos casualizados, com cinco repetições. Foram avaliados: número de flores por planta; número de folhas por haste floral; produção de matéria seca de raízes, folhas e flores; altura da planta; número de dias para o florescimento; comprimento do botão floral; e diâmetro e longevidade floral. Além disso, foram determinados os teores foliares de clorofila total e B e os sintomas de toxidez desse elemento. Verificou-se efeito significativo das doses de B na maioria das variáveis avaliadas, excetuando-se a altura das plantas, o número de flores por planta, a longevidade floral e a produção de matéria seca de raízes. O teor foliar de B aumentou linearmente em função das doses desse elemento. Houve incremento na produção e qualidade das flores com a aplicação do B, com redução do número de dias para o florescimento. Foram verificados sintomas de toxidez causado pelo B a partir da dose de 4 mg kg -1 . Esses sintomas foram caracterizados por manchas do tipo encharcamento, iniciando nas margens do limbo foliar, com essas evoluindo para clorose e posterior necrose; na maior dose ocorreu queda de folhas. Essa queda foi responsável pela diminuição do número de folhas por haste no final do ciclo, a partir da dose de 8 mg kg -1 de B. As plantas com sintomas de toxidez apresentaram teores foliares de B acima de 200 mg kg -1 , enquanto as sadias (controle), de 65 a 89 mg kg -1 .Termos de indexação: Rosa hybrida, micronutriente, ácido bórico, floricultura.

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Section: Resultados and Discussãounclassified

Section: Produção E Qualidade De Rosas Em Razão De Doses De Boro Apliunclassified

Produção e qualidade de rosas em razão de doses de boro aplicadas no substrato

Júnior

Carvalho-Zanão

Fontes

et al. 2014

Rev. Bras. Ciênc. Solo

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“…Boron is a semi-metallic element and also a pollutant commonly present in wastewater (EPA, 2012;WHO, 2006a). Besides its toxicity to human and plants (Nable et al, 1997;Parks and Edwards, 2005), B may also affect microbial communities, although the reported effects due to its excess in soils are scarce in literature and commonly associated with effects of soil salinity. Nevertheless, B has been shown to reduce bacterial diversity and dehydrogenase activity of soils (Ibekwe et al, 2010;Khan et al, 2012;Nelson and Mele, 2007).…”

Section: Contaminantsmentioning

confidence: 99%

Wastewater reuse in irrigation: A microbiological perspective on implications in soil fertility and human and environmental health

Becerra-Castro

Lopes

Vaz‐Moreira

et al. 2015

Environment International

418

211

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The reuse of treated wastewater, in particular for irrigation, is an increasingly common practice, encouraged by governments and official entities worldwide. Irrigation with wastewater may have implications at two different levels: alter the physicochemical and microbiological properties of the soil and/or introduce and contribute to the accumulation of chemical and biological contaminants in soil. The first may affect soil productivity and fertility; the second may pose serious risks to the human and environmental health. The sustainable wastewater reuse in agriculture should prevent both types of effects, requiring a holistic and integrated risk assessment. In this article we critically review possible effects of irrigation with treated wastewater, with special emphasis on soil microbiota. The maintenance of a rich and diversified autochthonous soil microbiota and the use of treated wastewater with minimal levels of potential soil contaminants are proposed as sine qua non conditions to achieve a sustainable wastewater reuse for irrigation.

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“…The relationship between phenolic metabolism and B may lead to a hidden deficiency or sub-optimal state of B in T 0 , because, although the B concentrations greater than 100 mg kg À1 d.w. are considered to be increasingly toxic (Shannon et al, 1999), the narrow range between B requirement and B toxicity has been continuously questioned (Nable et al, 1997). Nevertheless, the requirements for this species are high, as in other Brassicaceae (Nable et al, 1997), and higher contents coincided with the highest phenolic contents and the highest PPO in T 0 (Table 6), which could reflect and imbalance in B (Blevins and Lukaszewski, 1998;Ruiz et al, 1999).…”

Section: Discussionmentioning

confidence: 99%

“…Nevertheless, the requirements for this species are high, as in other Brassicaceae (Nable et al, 1997), and higher contents coincided with the highest phenolic contents and the highest PPO in T 0 (Table 6), which could reflect and imbalance in B (Blevins and Lukaszewski, 1998;Ruiz et al, 1999). It is known that different conditions of the nutritional state of B (Ruiz et al, 1999) with low temperatures (Zhang et al, 1997) and high illumination or irradiation (Solecka et al, 1999) favour higher phenolic metabolism, as in our T 0 (PPO, anthocyanins, O-dPh and TPh, Table 3), while better growing conditions (those of T 1 and T 2 ) lower the phenolic concentration (Ruiz et al, 1999;Schmid and Amrhein, 1999).…”

Section: Discussionmentioning

confidence: 99%

Growth conditions, elemental accumulation and induced physiological changes in Chinese cabbage

et al. 2003

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Soils contaminated with low levels of heavy metals and other trace elements are now frequently used for vegetable growing. In this situation, heavy metals and trace elements from these polluted soils may accumulate in the agricultural plants being grown in them and thereby enter the human food chain. The objectives of this study are to elucidate the effects of growth conditions, manipulated by the crop covers, on the phytoaccumulation of elements, and to investigate the conceivable influences of these conditions on the plant biochemistry. In three consecutive years of field experiments, open air (T 0 ), and floating rowcover treatments (T 1 : perforated polyethylene 50 lm; T 2 : polypropylene 17 g m À2 ) were used to produce different environmental conditions for the growth of Chinese cabbage [Brassica rapa L. (Pekinensis group) cv. ÔNagaoka 50Õ]. Five samplings (whole tops) were carried out from transplanting to harvest and measurements of B, Al, Ag, Si and Ca concentration as well as phenolics (orto-diphenols, total phenols and anthocyanins), pectic fractions, amino acids (histidine, phenylalanine and tyrosine) and polyphenol oxidase activity, were carried out in samples. The T 1 (perforated polyethylene sheet) gave greater B, Al, Ag and Si concentration and phytoextraction (in weight units) than the open-air control. These findings can help to develop new cost-effective techniques for phytoremediation as the application of plastic covers in the field. The build-up of heavy metals in those crops would make the product less suitable for human consumption.

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Boron toxicity

Cited by 156 publications

References 100 publications

Produção e qualidade de rosas em razão de doses de boro aplicadas no substrato

Produção e qualidade de rosas em razão de doses de boro aplicadas no substrato

Wastewater reuse in irrigation: A microbiological perspective on implications in soil fertility and human and environmental health

Growth conditions, elemental accumulation and induced physiological changes in Chinese cabbage

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