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

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• 作者：Eduardo D. Mariano (1)
  Aluisio S. Pinheiro (2)
  Edivaldo E. Garcia (3)
  Willem G. Keltjens (4)
  Renato A. Jorge (5)
  Marcelo Menossi (1)
  
  1. Department of Genetics ; Evolution and Bioagents ; Institute of Biology ; University of Campinas 鈥?UNICAMP ; PO Box 6109 ; 13083-970 ; Campinas ; SP ; Brazil
  2. Institute of Mathematics ; Statistics and Scientific Computation ; University of Campinas 鈥?UNICAMP ; PO Box 6065 ; 13083-970 ; Campinas ; SP ; Brazil
  3. Department of Chemistry ; State University of Maring谩 鈥?UEM ; 87020-900 ; Maring谩 ; PR ; Brazil
  4. Department of Soil Quality ; Wageningen University 鈥?WUR ; PO Box 47 ; 6700 AA ; Wageningen ; The Netherlands
  5. Department of Physical Chemistry ; Institute of Chemistry ; University of Campinas 鈥?UNICAMP ; PO Box 6154 ; 13084-971 ; Campinas ; SP ; Brazil
  
• 关键词：Aluminium toxicity ; Calcium ; Magnesium ; Plant root ; Potassium ; Tolerance
• 刊名：Plant and Soil
• 出版年：2015
• 出版时间：March 2015
• 年：2015
• 卷：388
• 期：1-2
• 页码：323-335
• 全文大小：882 KB
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• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Plant Sciences
  Soil Science and Conservation
  Plant Physiology
  Ecology
  
• 出版者：Springer Netherlands
• ISSN：1573-5036

文摘

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.