Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/63748
Type: Artigo de periódico
Title: Effect of anion channel antagonists and La3+ on citrate release, Al content and Al resistance in maize roots
Author: Jorge, RA
Menossi, M
Abstract: The correlation between organic acid anion release and Al content was examined in two maize (Zea mays L.) inbred lines, Cat 100-6 (Al-resistant) and S 1587-17 (Al-sensitive) treated with anion channel antagonists and La3+, a cation channel blocker. In the intact roots of Al-resistant maize, the Al-induced excretion of citrate was inhibited by the anion channel antagonists niflumic acid, anthracene-9-carboxylic and ethacrinic acid. Citrate release in excised root apices was reduced by 60% in the presence of 15 mu M niflumic acid, while the Al content increased by 42%. Nevertheless, Cat 100-6 accumulated less Al than S 1587-17 when the rate of citrate release was similar in both lines, indicating that other mechanisms of Al-resistance are operating in Cat 100-6. The presence of 60 mu M La3+ did not change the rate of citrate release, but the Al content in excised root apices of Al-resistant plants was reduced by 70%. These results suggest that the Al distributed uniformly in the roots does not contribute to citrate release and possibly the activity of anion channels is correlated with the free activities of extracellular Al3+ close to anion channels. (c) 2005 Elsevier Inc. All rights reserved.
Subject: aluminum toxicity
maize
aluminum resistance
channel inhibitors
lanthanum
Country: EUA
Editor: Elsevier Science Inc
Rights: fechado
Identifier DOI: 10.1016/j.jinorgbio.2005.07.002
Date Issue: 2005
Appears in Collections:Unicamp - Artigos e Outros Documentos

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