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

Content Provider	Springer Nature Link
Author	Maria, Eduardo D. Pinheiro, Aluisio S. Garcia, Edivaldo E. Keltjens, Willem G. Jorge, Renato A. Messi, Marcelo
Copyright Year	2014
Abstract	The sensitivity of root cells and root processes to toxic aluminium ions (Al$^{3+}$) 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 (Ca$^{2+}$), magnesium (Mg$^{2+}$), 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 Ca$^{2+}$ and Mg$^{2+}$ uptake, but not K$^{+}$ uptake. The negative effects of Al$^{3+}$ 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.
Starting Page	323
Ending Page	335
Page Count	13
File Format	PDF
ISSN	0032079X
Journal	Plant and Soil
Volume Number	388
Issue Number	1-2
e-ISSN	15735036
Language	English
Publisher	Springer International Publishing
Publisher Date	2014-11-23
Publisher Place	Cham
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Aluminium toxicity Calcium Magnesium Plant root Potassium Tolerance Plant Sciences Soil Science & Conservation Plant Physiology Ecology
Content Type	Text
Resource Type	Article
Subject	Soil Science Plant Science

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