Effect of different aluminum concentrations in nutrient solution on the tolerance of rice cultivars

brag Bragantia Bragantia 0006-8705 1678-4499 Instituto Agronômico de Campinas Campinas, SP, Brazil Eleven rice cultivars were studied in relation to aluminum toxicity using six different levels of this element (0, 10, 20, 30, 40 and 50mg/l) in nutrient solution under constant temperature (30±1°C) and pH = 4.0. Plant tolerance was measured taking into account the central primary root length and the total leaf and root dry weight. The presence of aluminum in the solution produced harmfull effects on all rice cultivars studied. The rice cultivars IR-8, IR-841 and IAC-899 were sensitive when it was added 10mg/l of Al3+ into the solution and the cultivars IAC-435, IAC-120, Pérola, Blue Bonnet, IAC-164, IAC-25, IAC-165 and IAC-47 showed tolerance to this Al concentration. The last cultivars presented tolerance even with 20mg/l of Al3+ in the solution. All cultivars were sensitive with 50mg/l of Al in the solution. The aluminum concentration increased and the Ca, Mg and K concentrations decreased in the leaf dry matter, for all cultivars under study, as aluminum concentration in nutrient solutions increased from 0 to 50mg/l. ARTIGOS Diferentes concentrações de alumínio em solução nutritiva na tolerância de cultivares de arroz Effect of different aluminum concentrations in nutrient solution on the tolerance of rice cultivars Carlos Eduardo de Oliveira CamargoI, *; Octávio Bento de Almeida CamargoI, *; Derly Machado de SouzaII ISeção de arroz e Cereais de Inverno, IAC IIDivisão de Plantas Alimentícias Básicas, Instituto agronômico, IAC RESUMO Foram estudados onze cultivares de arroz em soluções nutritivas contendo seis níveis de alumínio (0, 10, 20, 30, 40 e 50mg/litro) mantendo-se constante a temperatura de 30±1°C e o pH das soluções igual a 4,0. A tolerância foi medida pelo comprimento médio da raiz primária central, peso seco total das folhas e das raízes de vinte plantas após serem cultivadas durante dez dias em soluções nutritivas contendo diferentes concentrações de alumínio. A presença de qualquer das doses de alumínio foi prejudicial a todos os cultivares estudados. Os cultivares IR-8, IR-841 e IAC-899 foram sensíveis quando se empregaram 10mg/litro de Al3+ nas soluções, ao passo que os cultivares IAC-435, IAC-120, IAC-165, IAC-164, Pérola, Blue Bonnet, IAC-47 e IAC-25 mostraram-se tolerantes, mantendo essa tolerância mesmo quando se empregaram 20mg/litro de Al3+ nas soluções. Todos os cultivares foram sensíveis quando foi aplicada a quantidade de alumínio equivalente a uma concentração de 50mg/litro. Os teores de alumínio em partes por milhão aumentaram e os teores de Ca, Mg e K diminuíram na matéria seca da parte aérea de todos os cultivares à medida que se aumentaram as concentrações de Al nas soluções nutritivas. SUMMARY Eleven rice cultivars were studied in relation to aluminum toxicity using six different levels of this element (0, 10, 20, 30, 40 and 50mg/l) in nutrient solution under constant temperature (30±1°C) and pH = 4.0. Plant tolerance was measured taking into account the central primary root length and the total leaf and root dry weight. The presence of aluminum in the solution produced harmfull effects on all rice cultivars studied. The rice cultivars IR-8, IR-841 and IAC-899 were sensitive when it was added 10mg/l of Al3+ into the solution and the cultivars IAC-435, IAC-120, Pérola, Blue Bonnet, IAC-164, IAC-25, IAC-165 and IAC-47 showed tolerance to this Al concentration. The last cultivars presented tolerance even with 20mg/l of Al3+ in the solution. All cultivars were sensitive with 50mg/l of Al in the solution. The aluminum concentration increased and the Ca, Mg and K concentrations decreased in the leaf dry matter, for all cultivars under study, as aluminum concentration in nutrient solutions increased from 0 to 50mg/l. Texto completo disponível apenas em PDF. Full text available only in PDF format. Recebido para publicação a 10 de setembro de 1983. * Com bolsa de suplementação do CNPq. 1. ALUMINUM toxicity in upland soils. In: ANNUAL, REPORT FOR 1973. Los Baños-Philippines, The International Rice Research Institute, 1974. p.103. ANNUAL, REPORT FOR 1973 1974 103 2. BATAGLIA, O.C.; TEIXEIRA, J.P.F.; FURLANI, P.R.; FURLANI, A.M.O.; GALLO, J.R. Métodos de análise química de plantas. Campinas, Instituto Agronômico, 1978. 31p. (Circular 87) Métodos de análise química de plantas 1978 87 BATAGLIA O.C TEIXEIRA J.P.F FURLANI P.R FURLANI A.M.O GALLO J.R 3.  CAMARGO, C.E.O.; CAMARGO, O.B.A.; SOUZA, D.M. Tolerância de cultivares de arroz a diferentes níveis de alumínio em solução nutritiva. 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