Busca avançada
Ano de início
Entree
(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Differential aluminium-impaired nutrient uptake along the root axis of two maize genotypes contrasting in resistance to aluminium

Texto completo
Autor(es):
Mariano, Eduardo D. [1] ; Pinheiro, Aluisio S. [2] ; Garcia, Edivaldo E. [3] ; Keltjens, Willem G. [4] ; Jorge, Renato A. [5] ; Menossi, Marcelo [1]
Número total de Autores: 6
Afiliação do(s) autor(es):
[1] Univ Estadual Campinas, UNICAMP, Dept Genet Evolut & Bioagents, Inst Biol, BR-13083970 Campinas, SP - Brazil
[2] Univ Estadual Campinas, Inst Math Stat & Sci Computat, UNICAMP, BR-13083970 Campinas, SP - Brazil
[3] Univ Estadual Maringa, Dept Chem, UEM, BR-87020900 Maringa, Parana - Brazil
[4] Wageningen Univ, Dept Soil Qual, WUR, NL-6700 AA Wageningen - Netherlands
[5] Univ Estadual Campinas, Inst Chem, Dept Phys Chem, UNICAMP, BR-13084971 Campinas, SP - Brazil
Número total de Afiliações: 5
Tipo de documento: Artigo Científico
Fonte: PLANT AND SOIL; v. 388, n. 1-2, p. 323-335, MAR 2015.
Citações Web of Science: 6
Resumo

The sensitivity of root cells and root processes to toxic aluminium ions (Al3+) varies along the root axis. This study was established to assess the sensitivity of nutrient uptake to Al along the main root axis of maize genotypes that differ in resistance to Al and to test whether citrate, an Al-complexing compound that is unevenly released along the root axis, can play a role in protecting the root from Al-impaired nutrient uptake. A divided-root-chamber technique was used to measure net fluxes of calcium (Ca2+), magnesium (Mg2+), and potassium (K+) along intact roots of two maize genotypes differing in resistance to Al. The accumulation of Al along their main root axis was also measured in short-term experiments. Results of these experiments were compared with those of a previous study, where citrate exudation had been measured along identical maize root axes. Aluminium affected nutrient uptake widely along the root with strong effects in the apical region, reducing total Ca2+ and Mg2+ uptake, but not K+ uptake. The negative effects of Al3+ were more pronounced in the Al sensitive genotype than in the resistant one. The former also accumulated more Al in its roots than the latter, but this differential accumulation was observed only in the apical part of the root. The spatial pattern of nutrient uptake, irrespective of Al treatment, did not match that of Al-stimulated citrate exudation. Based on the differential sensitivity of the root axis of the two maize genotypes and especially on the extent of the root zones where these differences are expressed, it is suggested that the less Al-disturbed nutrient uptake of a genotype is associated with its resistance to Al. (AU)

Processo FAPESP: 11/00189-0 - Alteração da acidez do apoplasto da raiz como mecanismo de resistência a alumínio em milho
Beneficiário:Isadora de Camargo Ribeiro
Linha de fomento: Bolsas no Brasil - Iniciação Científica
Processo FAPESP: 04/04821-0 - Avaliação quantitativa do potencial de proteção dos ácidos orgânicos exsudados pelas raízes contra os efeitos do alumínio tóxico do solo
Beneficiário:Eduardo Dal'Ava Mariano
Linha de fomento: Bolsas no Brasil - Pós-Doutorado