Aluminium tolerance in plants and the complexing role of organic acids

Feng, Jian; Ryan, Peter R.; Delhaize, Emmanuel

doi:10.1016/s1360-1385(01)01961-6

Cited by 1,174 publications

(823 citation statements)

References 31 publications

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“…A origem evolutiva desta característica nas plantas superiores e os mecanismos de absorção, translocação e deposição em vários componentes da biomassa estão sendo discutidos na literatura recente (Hodson & Sangster 1999, Ma et al 2001, Watanabe & Osaki 2002, Jansen et al 2002, 2003. Das nove espécies encontradas com concentrações de Al acima de 1.000 mg.kg -1 , neste estudo, cinco ocorreram na EEP em solo rico em Ca e baixa saturação de Al, sendo três comuns a FEG.…”

Section: Discussionunclassified

Perfil nutricional de espécies lenhosas de duas florestas semidecíduas em Uberlândia, MG

Haridasan

Araújo

2005

Rev. bras. Bot.

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-(Nutritional status of woody species of two semideciduous forests in Uberlândia, MG). The objective of this study was to determine the influence of soil fertility on the mineral nutrition and distribution of native species in two semideciduous forests at the Experimental Farm at Gloria (FEG) and the Ecological Station at Panga (EEP) in Uberlândia, MG. Leaf samples were collected from two to four individuals with a minimum circumference of 10 cm at 1,30 m height of all species within 50 contiguous plots of 10 m × 10 m in each forest. Soil samples were analyzed from the A1 e A3 horizons of each plot of both areas. The soil of EEP showed lower acidity, higher availability of Ca and lower availability of Al, Fe, Zn and Cu. The availability of Mn was lower in the A3 horizon and higher in the A1 horizon at EEP. The foliar concentrations of Ca e K were higher at EEP which reflected the higher levels in soil. There were no differences in the concentrations of P, Mg, Fe, Cu and Zn. The N concentrations were higher among species occurring exclusively at FEG. The Mn concentrations were lower at EEP, reflecting the effect of pH on its absorption. Thus the occurrence of some species exclusively at EEP seemed to be associated with their ability to absorb K and Mg from soils with high Ca availability.Key words -aluminum accumulators, calcicoles, foliar nutrient concentrations, soil fertility, tropical forests RESUMO -(Perfil nutricional de espécies lenhosas de duas florestas semidecíduas em Uberlândia, MG). O estudo teve como objetivo determinar a influência da fertilidade sobre nutrição mineral e distribuição das espécies nativas em duas florestas semidecíduas na Fazenda Experimental de Glória (FEG) e Estação Ecológica do Panga (EEP) em Uberlândia, MG. Foram amostradas de duas a quatro árvores, com circunferência mínima de 10 cm, a altura de 1,30 m do solo, de todas as espécies encontradas em 50 parcelas contíguas de 10 m × 10 m, em cada floresta. Foram analisadas amostras de solo dos horizontes A1 e A3 de cada parcela nas duas florestas. O solo da EEP apresentou menor acidez, associada à maior disponibilidade de Ca e menor disponibilidade de Al, Fe, Zn e Cu. A disponibilidade Mn foi menor no horizonte A3 e maior no A1 na EEP. As concentrações foliares de Ca e K foram maiores nas espécies da EEP. As diferenças no teor de Ca refletiram a maior disponibilidade do nutriente no solo. Não houve diferenças nas concentrações foliares de P e Mg. O teor médio de N foi maior na floresta FEG do que na EEP, apenas em espécies exclusivas. As concentrações de Mn foram menores na EEP, refletindo a influência do pH na absorção deste nutriente. Assim, a ocorrência de espécies presentes exclusivamente na EEP pode estar associada à capacidade de absorver K e Mg de solos com altos teores de Ca.Palavras-chave -acumuladoras de alumínio, calcícolas, concentração foliar de nutrientes, fertilidade do solo, floresta tropical

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Section: Discussionunclassified

Perfil nutricional de espécies lenhosas de duas florestas semidecíduas em Uberlândia, MG

Haridasan

Araújo

2005

Rev. bras. Bot.

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“…Shoot aluminium content was also considerably lower for the tolerant genotypes T 7,67 B and GT 101E) than for the sensitive genotypes (Bahar, Pusa 2002-2 and Pusa 9). However, no indication of internal detoxification (Ma et al 2001) was observed. Therefore, aluminium tolerance per se in tolerant genotypes of pigeonpea involved aluminium exclusion (Delhaize and Ryan 1995;Kochian 1995).…”

Section: Hydroponic Assay: Nutrient Uptake Behaviourmentioning

confidence: 92%

Screening of pigeonpea genotypes for nutrient uptake efficiency under aluminium toxicity

Choudhary

Singh

2011

Physiol Mol Biol Plants

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For increasing pigeonpea production in India, it is necessary to expand its area in non-traditional areas such as north-eastern states, which have considerable area under acidic soils. In such soils, aluminium toxicity, which is a major yield limiting factor, interferes with nutrient uptake efficiency of crop plants. 32 genotypes of pigeonpea [Cajanus cajan (L.) Millsp.] were screened for tolerance to aluminium toxicity at four different aluminium concentrations (41, 82, 123 and 205 μM Al) by hematoxylin staining and root re-growth methods. The results of the two screening methods were consistent, suggesting that either of the two methods could be used for screening purpose. The most tolerant (IPA 7-10, T 7, 67 B and GT 101E) and sensitive (Bahar, Pusa 9 and Pusa 2002-2) genotypes were assessed for root and shoot aluminium contents in hydroponic assay at 0, 41, 82, 123 and 205 μM aluminium concentrations. Root and shoot aluminium contents were significantly lower in the tolerant than sensitive genotypes, indicating that aluminium tolerance mechanism involved aluminium exclusion and perhaps internal detoxification. Tolerant and sensitive genotypes were further assessed for phosphorus, potassium, calcium and magnesium contents in their root and shoot. Tolerant genotypes (IPA 7-10, T 7, 67 B and GT 101E) accumulated significantly high amounts of these nutrients (>1.5 times) compared to the sensitive ones. Better performance of tolerant genotypes could be ascribed to better nutrient uptake efficiency and distribution within the plants.

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“…For example, several studies have shown the key role of organic acids in affecting plant tolerance to aluminum (Pellet et al 1995;Ma et al 2001). The role of organic acids in mediating the uptake of Fe 3+ was ascribed to ferric reductase activity and the presence of cation channels (Schmidt 1999).…”

Section: Introductionmentioning

confidence: 99%

Organic acids enhance the uptake of lead by wheat roots

Wang

Shan

Liu

et al. 2006

Planta

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The uptake and bioavailability of lead (Pb) in soil-plant systems remain poorly understood. This study indicates that acetic and malic acids enhance the uptake of Pb by wheat (Triticum aestivum L.) roots under hydroponic conditions. The net concentration-dependent uptake influx of Pb in the presence and absence of organic acids was characterized by Michaelis-Menten type nonsaturating kinetic curves that could be resolved into linear and saturable components. Fitted maximum uptake rates (V max ) of the Michaelis-Menton saturable component in the presence of acetic and malic acids were, respectively, 2.45 and 1.63 times those of the control, while the Michaelis-Menten K m values of 5.5, 3.7 and 2.2 lM, respectively, remained unchanged. Enhanced Pb uptake by organic acids was partially mediated by Ca 2+ and K + channels, and also depended upon the physiological function of the plasma membrane P-type ATPase. Uptake may have been further enhanced by an effectively thinner unstirred layer of Pb adjacent to the roots, leading to more rapid diffusion towards roots. X-ray absorption spectroscopic studies provided evidence that the coordination environment of Pb in wheat roots was similar to that of Pb(CH 3 COO) 2 Á3H 2 O in that one Pb atom was coordinated to four oxygen atoms via the carboxylate group.

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Aluminium tolerance in plants and the complexing role of organic acids

Cited by 1,174 publications

References 31 publications

Perfil nutricional de espécies lenhosas de duas florestas semidecíduas em Uberlândia, MG

Perfil nutricional de espécies lenhosas de duas florestas semidecíduas em Uberlândia, MG

Screening of pigeonpea genotypes for nutrient uptake efficiency under aluminium toxicity

Organic acids enhance the uptake of lead by wheat roots

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