ALLEVIATION EFFECT OF DIFFERENT RATIOS OF Al TO Ca ON Al TOXICITY FOR MORPHOLOGICAL GROWTH OF MUNGBEAN SEEDLING

Yang, Yonghua; Chen, Shan-Min; Abdullahi, Bilkisu A.

doi:10.1081/pln-100104981

Cited by 5 publications

(2 citation statements)

References 23 publications

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“…It seems that, in some species and cultivars, efficient transport of Ca constitutes a complementary mechanism of aluminium resistance. Moreover, high concentrations of Ca in the solution at appropriate Al/Ca ratios could increase chlorophyll content, an indication of alleviation effect in mungbean (Yang et al, 2001). In the presence of high Al doses (1500 µM), K content in root of all cultivars showed a significant decrease that corresponds to a decrease in K absorption by the roots.…”

Section: Macro Nutrientsmentioning

confidence: 99%

Effect of aluminum stress on mineral nutrition in rice cultivars differing in aluminum sensitivity

Macêdo¹,

Jan

2008

Rev. bras. eng. agríc. ambient.

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The effects of aluminum (Al) stress on ion concentration and distribution were investigated in four rice cultivars (Aiwu and IKP, Al sensitive; IRAT112 and IR6023, Al resistant). Macro and micronutrient levels in plant tissues were markedly affected by Al and the magnitude of this effect depended on the cultivar group (Al resistance versus Al sensitivity) and on the concentration of Al in the nutrient solution. Al decreased Ca, P, K, Mg and Mn concentrations in shoot and K, Mg and Mn in root. It increased Ca and P in root and caused an increase in shoot and root Al contents. All these effects were observed in both cultivar groups, but were more apparent in Al sensitive ones. In conclusion, the results support the idea that, compared to the Al sensitive cultivars Aiwu and IKP, Al resistance in IRAT112 and IR6023 could be explained by a limited absorption and translocation of Al from root to shoot and could also be explained by a more efficient transport of Ca, P and Mn from root to shoot. These findings showed clearly that more than one mechanism may contribute to Al resistance in rice plants. Key words: mechanism resistance, nutrients allocation, oryza sativaEfeito do alumínio na nutrição mineral de cultivares de arroz diferindo na sensibilidade ao alumínio RESUMO Estudou-se o efeito do estresse causado pelo alumínio (Al) na concentração e distribuição de íons de quatro cultivares de arroz (Aiwu e IKP, sensíveis ao Al; IRAT112 e IR6023, resistentes ao Al) e se concluiu que sua presença afetou os níveis de macro e micronutrientes nos tecidos das plantas enquanto a amplitude desse efeito depende dos grupos das cultivares (Al resistente versus Al sensível) e da concentração de Al na solução nutritiva. A presença do Al diminuiu a concentração de Ca, P, K, Mg e Mn nas folhas, mas a aumentou em K, Mg e Mn nas raízes. O Al causou aumento da concentração de Ca e P nas raízes e aumentou a sua quantidade nas folhas e raízes; esses efeitos foram observados nos dois grupos das cultivares, embora de forma mais marcada nas cultivares sensíveis ao Al. Os resultados reforçam a idéia de que, comparativamente às cultivares sensíveis Aiwu e IKP, a resistência ao Al nas cultivares resistentes IRAT112 e IR6023, pode ser explicada por uma absorção limitada e translocação do Al das raízes para as folhas e, possivelmente, por um transporte mais eficiente de Ca, P e Mn das raízes para as folhas. Os resultados mostram que mais de um mecanismo pode contribuir para a resistência ao Al, em plantas de arroz.Palavras-chave: mecanismo de resistência, alocação de nutrientes, oryza sativa

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Section: Macro Nutrientsmentioning

confidence: 99%

Effect of aluminum stress on mineral nutrition in rice cultivars differing in aluminum sensitivity

Macêdo¹,

Jan

2008

Rev. bras. eng. agríc. ambient.

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“…Las respuestas comunes de genotipos tolerantes al exceso de aluminio, se presentan acorde con la capacidad de las plantas para modificar el pH del continuum suelo/raíz (Mengel & Kirkby, 1987;El-Shatnawi & Makhadmeh, 2001). La detoxificación de Al +3 mediante la quelatación, se puede desarrollar, a través de la excreción de ácidos orgánicos y polifenoles hacia la rizósfera (Kayama, 2001;Tesfaye et al 2001), implicando eventualmente la alteración en los niveles de Mg y Ca (Silva et al 2001;Yang et al 2001).…”

Section: Introductionunclassified

Crecimiento de plántulas de maíz (Zea mays L. var. Porva) en solución nutritiva con baja relación (ca+mg+k)/al

Casierra–Posada¹,

Cárdenas-Hernández

2009

Rev. U.D.C.A Act. & Div. Cient.

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La toxicidad por aluminio, se relaciona en la productividad de cultivos establecidos en suelos ácidos con alta disponibilidad de Al 3+. Frecuentemente, a valores de pH inferiores a 5,0, existe un efecto tóxico en especies agrícolas importantes, debido a la solubilidad del Al 3+. Este trabajo, se llevó a cabo en Tunja, Boyacá, Colombia, para determinar el efecto tóxico del aluminio en el crecimiento de plántulas de maíz (Zea mays L. var. Porva). Las plántulas crecieron en solución nutritiva gaseosa (macro y micronutrientes), en relaciones (Ca+Mg+K)/ Al 1; 0,75 ó 0,5, mediante la adición de Al 2 (SO 4) 3. 18H 2 O en relación con las bases (Ca, Mg y K), contenidas en la solución. Al medio de crecimiento de las plantas testigo, no se les adicionó aluminio. El pH, se ajustó a 5,5 para todos los tratamientos. Las plántulas fueron analizadas cuando se hicieron evidentes los síntomas por toxicidad de aluminio. Se estimó la longitud radical total, el peso seco y el área foliar; adicionalmente, se calculó la relación raíz/vástago. El área foliar, peso seco y longitud radical total no mostraron diferencias estadísticas entre los tratamientos con relaciones (Ca+Mg+K)/Al 1 a 0,5; sin embargo, todos los tratamientos con aluminio fueron estadísticamente diferentes al control. Los valores de la relación raíz/vástago mostraron una tendencia inversamente proporcional con la relación (Ca+Mg+K)/ Al; estos resultados implican que la variedad de maíz Porva es muy sensible al aluminio, independientemente si la relación bases/aluminio se encuentre baja o en balance.

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Mist culture for mass harvesting of root border cells: aluminum effects

Ying

Goldbach

2006

Z. Pflanzenernähr. Bodenk.

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Root border cells, which form a cell layer around the root tip, seem to play multiple roles in the rhizosphere of the apical root. As these cells (species‐dependent dozens to several thousand per root tip) are rapidly sloughed off in water, studies in hydroponic culture fail to elucidate their role in most conventional physiological studies. The common method for harvesting these cells consists in germination of seeds in a humid atmosphere (usually a Petri dish), but labor and time constraints allow to yield only very limited amounts of uniform cells. We thus developed a low‐cost mist‐culture method, where intact border cells can be collected in the range of several grams. We applied this technique in a preliminary experiment where the influence of aluminum (Al) supply on calcium (Ca) release and viability of this cell type was studied. Purified detached border cells of pea were incubated with 0, 50, and 500 mmol m–3 AlCl3 solution (pH 4.5) for 90 min at a ratio of 3 × 105 cells (4 mL)–1. After incubation, cells contained 4.27 and 13.28 mg Al g–1 C at 50 mmol m–3 and 500 mmol m–3 AlCl3, respectively, while their total Ca content decreased correspondingly. Cell viability of border cells as tested by fluorescein diacetate‐propidium iodide (FDA‐PI) fluorescence yielded unexpected results: the test exhibited significantly lower vitality at 50, but not at 500 mmol m–3 AlCl3. Assessing mitochondrial activity by 3‐(4,5)‐dimethylthiazol‐2‐yl‐2,5 diphenyl‐tetrazolium‐bromide (MTT) reduction showed that viability decreased in a dose‐dependent manner with increasing Al concentrations. This apparent contradiction is attributed to the formation of dense mucilage around border cells at high Al concentrations, which likely inhibits the access of the dye PI or may chemically inactivate this compound and thus wrongly suggest higher viability. Mist culture allows harvesting selectively large amounts of homogeneous border cells quickly and to study their physiological reactions separated from the root tip.

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ALLEVIATION EFFECT OF DIFFERENT RATIOS OF Al TO Ca ON Al TOXICITY FOR MORPHOLOGICAL GROWTH OF MUNGBEAN SEEDLING

Cited by 5 publications

References 23 publications

Effect of aluminum stress on mineral nutrition in rice cultivars differing in aluminum sensitivity

Effect of aluminum stress on mineral nutrition in rice cultivars differing in aluminum sensitivity

Crecimiento de plántulas de maíz (Zea mays L. var. Porva) en solución nutritiva con baja relación (ca+mg+k)/al

Mist culture for mass harvesting of root border cells: aluminum effects

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