caa a22 4500 606218270 CHVBK 20210128101111.0 cr unu---uuuuu 210128e20150301xx s 000 0 eng 10.1007/s11104-014-2334-z doi (NATIONALLICENCE)springer-10.1007/s11104-014-2334-z Differential aluminium-impaired nutrient uptake along the root axis of two maize genotypes contrasting in resistance to aluminium [Elektronische Daten] [Eduardo Mariano, Aluisio Pinheiro, Edivaldo Garcia, Willem Keltjens, Renato Jorge, Marcelo Menossi] Background and aims: 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. Methods: 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. Results: 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. Conclusion: 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. Springer International Publishing Switzerland, 2014 Aluminium toxicity nationallicence Calcium nationallicence Magnesium nationallicence Plant root nationallicence Potassium nationallicence Tolerance nationallicence Mariano Eduardo Department of Genetics, Evolution and Bioagents, Institute of Biology, University of Campinas - UNICAMP, PO Box 6109, 13083-970, Campinas, SP, Brazil aut Pinheiro Aluisio Institute of Mathematics, Statistics and Scientific Computation, University of Campinas - UNICAMP, PO Box 6065, 13083-970, Campinas, SP, Brazil aut Garcia Edivaldo Department of Chemistry, State University of Maringá - UEM, 87020-900, Maringá, PR, Brazil aut Keltjens Willem Department of Soil Quality, Wageningen University - WUR, PO Box 47, 6700 AA, Wageningen, The Netherlands aut Jorge Renato Department of Physical Chemistry, Institute of Chemistry, University of Campinas - UNICAMP, PO Box 6154, 13084-971, Campinas, SP, Brazil aut Menossi Marcelo Department of Genetics, Evolution and Bioagents, Institute of Biology, University of Campinas - UNICAMP, PO Box 6109, 13083-970, Campinas, SP, Brazil aut Plant and Soil Springer International Publishing 388/1-2(2015-03-01), 323-335 0032-079X 388:1-2<323 2015 388 11104 https://doi.org/10.1007/s11104-014-2334-z text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s11104-014-2334-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Mariano Eduardo Department of Genetics, Evolution and Bioagents, Institute of Biology, University of Campinas - UNICAMP, PO Box 6109, 13083-970, Campinas, SP, Brazil aut NATIONALLICENCE 700 1- Pinheiro Aluisio Institute of Mathematics, Statistics and Scientific Computation, University of Campinas - UNICAMP, PO Box 6065, 13083-970, Campinas, SP, Brazil aut NATIONALLICENCE 700 1- Garcia Edivaldo Department of Chemistry, State University of Maringá - UEM, 87020-900, Maringá, PR, Brazil aut NATIONALLICENCE 700 1- Keltjens Willem Department of Soil Quality, Wageningen University - WUR, PO Box 47, 6700 AA, Wageningen, The Netherlands aut NATIONALLICENCE 700 1- Jorge Renato Department of Physical Chemistry, Institute of Chemistry, University of Campinas - UNICAMP, PO Box 6154, 13084-971, Campinas, SP, Brazil aut NATIONALLICENCE 700 1- Menossi Marcelo Department of Genetics, Evolution and Bioagents, Institute of Biology, University of Campinas - UNICAMP, PO Box 6109, 13083-970, Campinas, SP, Brazil aut NATIONALLICENCE 773 0- Plant and Soil Springer International Publishing 388/1-2(2015-03-01), 323-335 0032-079X 388:1-2<323 2015 388 11104