Differential Aluminum Tolerance of Two Wheat Varieties Associated with Plant‐Induced pH Changes Around Their Roots

Foy, C. D.; Burns, George Robert; Brown, J. C.; Fleming, A. L.

doi:10.2136/sssaj1965.03615995002900010019x

Cited by 103 publications

(69 citation statements)

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“…In most of these experiments, pH in the culture solution was fixed when Al tolerance was examined. On the other hand, when wheat cultivars were grown in a medium in which the pH was not controlled, inhibition of growth by Al was positively correlated with the pH decrease in the medium (Foy et al 1965;Mugwira and Elgawhary 1979). These results indicate that the ability to change the rhizosphere pH is not always correlated with Al tolerance of plants, but that pH increase in the rhizosphere decreases the Al activity and thus prevents the root growth inhibition caused by Al toxicity in some plants.…”

mentioning

confidence: 88%

Effects of nitrogen source and aluminum on growth of tropical tree seedlings adapted to low pH soils

Watanabe

Osaki

Tadano

1998

Soil Science and Plant Nutrition

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mentioning

confidence: 88%

Effects of nitrogen source and aluminum on growth of tropical tree seedlings adapted to low pH soils

Watanabe

Osaki

Tadano

1998

Soil Science and Plant Nutrition

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“…Apparent plant tolerance can result from exclusion of toxic elements or metabolic tolerance to specific elements; the latter appears to be the more prevalent mechanism. Mechanisms for exclusion have been shown to include low root cation exchange capacities limiting uptake of Al and Mn (49), sorption of Zn to cell walls (50), and precipitation of Al by hydroxyl ions at the root surface (51,52).…”

Section: Metabolic Behavior Of Metals In Plants As Related To Tolerancementioning

confidence: 99%

Soil and plant factors influencing the accumulation of heavy metals by plants.

Cataldo¹,

Wildung²

1978

Environ Health Perspect

201

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The use of plants to monitor heavy metal pollution in the terrestrial environment must be based on a cognizance of the complicated, integrated effects of pollutant source and soil-plant variables. To be detectable in plants, pollutant sources must significantly increase the plant available metal concentration in soil. The major factor governing metal availability to plants in soils is the solubility of the metal associated with the solid phase, since in order for root uptake to occur, a soluble species must exist adjacent to the root membrane for some rinlte period. The rate of release and form of this soluble species will have a strong influence on the rate and extent of uptake and, perhaps, mobility and toxicity in the plant and consuming animals. The factors influencing solubility and form of available metal species in soil vary widely geographically and include the concentration and chemical form of the element entering soil, soil properties (endogenous metal concentration, mineralogy, particle size distribution), and soil processes (e.g., mineral weathering, microbial activity), as these influence the kinetics of sorption reactions, metal concentration in solution and the form of soluble and insoluble chemical species.The plant root represents the first barrier to the selective accumulation of ions present in soil solution. Uptake and kinetic data for nutrient ions and chemically related nonnutrient analogs suggest that metabolic processes associated with root absorption of nutrients regulate both the affinity and rate of absorption of specific nonnutrient ions. Detailed kinetic studies of Ni, Cd, and Tl uptake by intact plants demonstrate multiphasic root absorption processes over a broad concentration range, and the use of transport mechanisms in place for the nutrient ions Cu, Zn, and K. Advantages and limitations of higher plants as indicators of increased levels of metal pollution are discussed in terms of these soil and plant phenomena.The principal objectives of this review are to briefly describe the soil and plant factors influencing trace metal uptake by plants, and, with this information as a basis, illustrate some of the parameters which must be considered in using higher plants as indicators of increased levels of metals in the terrestrial environment.In order to utilize plants as monitors of metal pollution in the field, it is necessary to distinguish between uptake arising from natural metal sources and from pollutant sources. Metals from both natural and pollutant sources have the potential for being assimilated by the plant through foliar or root absorption processes. The importance of foliar absorption processes for several heavy elements has been discussed elsewhere (1, 2). Separation of the sources of metals taken up by roots is complicated by the mediating effect of soil properties and soil and plant processes. These effects may be illus-* Battelle, Pacific Northwest Laboratories, Richland, Washington, 99352. trated by examination of the concentration of metals in soil relative to po...

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“…Determinação da variabilidade espacial de alumínio em função da distribuição de argila em solos de Querência do Norte/Paraná, Brasil O semivariograma cruzado (Figura 4) que dispôs a relação entre as variáveis, mostrou um resultado melhor ajustado ao modelo gaussiano e apresentou dependência espacial entre o teor de alumínio e a argila até um alcance de 1600m, caso esse que se deve também ao fator extensão empregado na delimitação da grade de amostragem dos solos. Essa observação confirmou que a dependência espacial na distribuição granulométrica dos solos, na região de estudo, apresenta semelhança real sobre os níveis de alumínio determinados nas análises, corroborando a relação entre elementos apresentada por Foy et al (1965).…”

Section: Resultsunclassified

“…O alumínio é constituinte das partículas de argila do solo, ocorrendo a sua liberação para a fração trocável ou para a solução do solo, em situações onde o pH apresenta-se abaixo de 5,0 (FOY et al, 1965). A calagem corrige apenas as camadas superficiais do solo podendo o subsolo permanecer ainda ácido.…”

Section: Introductionunclassified

Determinação da variabilidade espacial de alumínio em função da distribuição de argila em solos de Querência do Norte/Paraná, Brasil

2011

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A maior parte dos solos brasileiros possui altos teores de alumínio e, em muitos casos, este elemento ocorre em níveis fitotóxicos. Constituinte dos minerais de argila, pode ter sua liberação diretamente na forma trocável ou para a solução do solo. O objetivo deste trabalho foi demonstrar a relação entre a variabilidade espacial do alumínio e a distribuição de argila do solo. Para isto, foi coletada uma malha de amostras de solo em campo, definida por meio de fotointerpretação e observação de imagens. Os resultados obtidos em laboratório foram submetidos a análises estatísticas visando a verificação da dependência espacial, que foi comprovada posteriormente. A continuidade espacial foi estudada mediante a elaboração de semivariogramas utilizando-se diferentes modelos. Os melhores semivariogramas foram escolhidos mediante a validação cruzada executada por meio de "krigagem" ordinária. Dessa forma, pôde-se observar que as variáveis estudadas apresentaram estrutura de dependência espacial, com correlação positiva entre si. Esses resultados possibilitaram a geração de mapas capazes de auxiliar o melhor aproveitamento agrícola da área. Palavras-chave: Geoestatística, semivariogramas, "Krigagem" ordinária AbstractThe major part of Brazilian soils shows elevated aluminum contents and in several cases this element occurs in phytotoxic levels. Aluminum is a constituent of the soil´s clay minerals. Its release can occur to the exchangeable fraction or to the soil solution. The objective of this work was to demonstrate the relationship between the spatial variability of aluminum and the distribution of soil clay. In order to achieve that, a grid of soil samples was collected in field, defined by means of photointerpretation and observation of images. The results obtained in laboratory were submitted to statistical analyses to verify spatial dependence, which was proven later. The space continuity was studied by means of the semivariogram's elaboration using different models. The best semivariograms were chosen by cross validation performed through "ordinary kriging". Thus, it could be observed that these variables showed structure of spatial dependence, with a positive correlation between them, besides it was possible to make maps in order to allow a better agricultural exploitation.

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Differential Aluminum Tolerance of Two Wheat Varieties Associated with Plant‐Induced pH Changes Around Their Roots

Cited by 103 publications

References 0 publications

Effects of nitrogen source and aluminum on growth of tropical tree seedlings adapted to low pH soils

Effects of nitrogen source and aluminum on growth of tropical tree seedlings adapted to low pH soils

Soil and plant factors influencing the accumulation of heavy metals by plants.

Determinação da variabilidade espacial de alumínio em função da distribuição de argila em solos de Querência do Norte/Paraná, Brasil

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