ALUMINUM STRESS INHIBITS ACCUMULATION OF PHOSPHORUS IN ROOT APICES OF ALUMINUM-SENSITIVE BUT NOT ALUMINUM-RESISTANT<b><i>BRACHIARIA</i></b>CULTIVAR

Wenzl, Peter; Mayer, Jorge E.; Rao, Idupulapati M.

doi:10.1081/pln-120006059

Cited by 11 publications

(4 citation statements)

References 25 publications

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“…In rice (Fageria, 1985;Jan, 1991;Sivaguru & Paliwal, 1993), wheat (Miranda & Rowell, 1989) and in certain pasture species (Andrew & Vandenberg, 1973), differential Al resistance has been correlated with differential abilities to absorb, to translocate and to utilise P in the presence of Al. Exposure to Al did not affect P concentration in root of Al-resistant Brachiaria cultivar, but it caused a 70% decline in P content of Al-sensitive Brachiaria cv (Wenzel et al, 2002). The question as to whether a more efficient transport of Ca in plants is associated with Al resistance is still unsolved.…”

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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“…Phosphorus deficiency was observed also in Triticale growing in nutrient solution with Al, which was probably one of the factors causing biomass reduction (Quartin et al 2001). The crucial role of P in Al tolerance mechanisms was suggested also by observation that pretreatment of rice with P ameliorated Al toxicity syndrome in shoots (Nakawa et al, 2003) and that Al stress inhibits accumulation of phosphorus in root tips only in aluminum-sensitive cultivar of Brachiaria (Wenzl et al, 2002). In wheat tolerance to acidity and Al toxicity in soils is associated with the ability of maintaining phosphate homeostasis in root tip, mainly by rapid transport of P between shoot and root (Miranda and Rowell, 1989).…”

Section: Discussionmentioning

confidence: 92%

Impact of Aluminum on Phosphate Uptake and Acid Phosphatase Activity in Root Tips ofLotus Japonicus

Zelinová

Huttová

Mistrı́k

et al. 2009

Journal of Plant Nutrition

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The effect of aluminum (Al) on phosphate homeostasis and induction of acid phosphatase activity and isoenzymes was analyzed in root tips of Lotus japonicus. The rapid uptake of phosphate as well as the decrease of soluble inorganic phosphate in tissues suggested, that the presence of Al in root apoplast causes precipitation of the most of absorbed phosphate. Acid phosphatase (ACP) isoenzymes are affected differentially during low pH and Al stress and both Al induced increases and decreases of ACP isoenzyme activities were observed.

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“…With regard to their interaction in soils and other growth media, it is clear that addition of P can reduce the level of Al and that high concentrations of Al can reduce the concentration of available P as a result of the chemical reactions between them. Aluminum inhibited P accumulation in root apices but simultaneously increased P accumulation in whole roots in a Brachiaria cultivar (Wenzl et al, 2002) and in Lotus japonicus (Zelinová et al, 2009). The conclusions by different investigators vary widely depending on the experimental methods and plant species and varieties used ( Table 2).…”

Section: The Aluminum-phosphorus Interactionmentioning

confidence: 99%

Coadaptation of Plants to Multiple Stresses in Acidic Soils

2014

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Soil acidification is an increasing problem in agricultural production and ecological stability worldwide. An understanding of the mechanisms by which plants adapt to acidic soils would help address this problem. Poor plant growth in acidic soils results from a variety of factors, including proton toxicity; deficiencies in nitrogen, phosphorus, calcium, magnesium; and toxicities of various metals (aluminum (Al), manganese, iron). Aluminum toxicity is generally the primary limitation for plant growth in acidic soils. Although much research has focused on Al toxicity in recent decades, it is rarely the only limiting factor in acidic soils. The occurrence of Al toxicity depends on many other factors that coexist with Al in acidic soils. The interactions between Al and such factors are important determinants of Al toxicity to plants under field conditions. In this review, therefore, instead of focusing only on mechanisms of Al tolerance, we examine the effects of the interactions between Al and other limiting factors on plant adaptation to acidic soils. We summarize research on the interactions between Al and nitrogen, phosphorus, pH, and iron. Accordingly, three strategies are proposed to improve plant growth in acidic soils: a combined application of lime and nutrients, depending on the types of soils and plants; development of plant varieties tolerant to multiple stresses; and inoculation of plants with certain beneficial microbes. This review emphasizes the ability of plants to coadapt to multiple stresses in acidic soils.

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ALUMINUM STRESS INHIBITS ACCUMULATION OF PHOSPHORUS IN ROOT APICES OF ALUMINUM-SENSITIVE BUT NOT ALUMINUM-RESISTANTBRACHIARIACULTIVAR

Abstract: The phosphorus (P) content of whole roots and root apices has been reported to increase under aluminum (Al) stress, particularly in Al-sensitive plant varieties. We investigated the impact of Al toxicity on the P content of root apices of two

Cited by 11 publications

References 25 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

Impact of Aluminum on Phosphate Uptake and Acid Phosphatase Activity in Root Tips ofLotus Japonicus

Coadaptation of Plants to Multiple Stresses in Acidic Soils

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