Root exudation of sugars, amino acids, and organic acids by maize as affected by nitrogen, phosphorus, potassium, and iron deficiency

Carvalhais, Lilia C., Dennis, Paul G., Fedoseyenko, Dmitri, Hajirezaei, Mohammad-Reza, Borriss, Rainer and von Wiren, Nicolaus (2011) Root exudation of sugars, amino acids, and organic acids by maize as affected by nitrogen, phosphorus, potassium, and iron deficiency. Journal of Plant Nutrition and Soil Science, 174 1: 3-11. doi:10.1002/jpln.201000085


Author Carvalhais, Lilia C.
Dennis, Paul G.
Fedoseyenko, Dmitri
Hajirezaei, Mohammad-Reza
Borriss, Rainer
von Wiren, Nicolaus
Title Root exudation of sugars, amino acids, and organic acids by maize as affected by nitrogen, phosphorus, potassium, and iron deficiency
Journal name Journal of Plant Nutrition and Soil Science   Check publisher's open access policy
ISSN 1436-8730
1522-2624
Publication date 2011-01-01
Year available 2011
Sub-type Article (original research)
DOI 10.1002/jpln.201000085
Volume 174
Issue 1
Start page 3
End page 11
Total pages 9
Place of publication Weinheim, Germany
Publisher Wiley - V C H Verlag GmbH and Co. KGaA
Language eng
Subject 1111 Nutrition and Dietetics
1110 Nursing
Abstract Root exudates play a major role in the mobilization of sparingly soluble nutrients in the rhizosphere. Since the amount and composition of major metabolites in root exudates from one plant species have not yet been systematically compared under different nutrient deficiencies, relations between exudation patterns and the type of nutrient being deficient remain poorly understood. Comparing root exudates from axenically grown maize plants exposed to N, K, P, or Fe deficiency showed a higher release of glutamate, glucose, ribitol, and citrate from Fe-deficient plants, while P deficiency stimulated the release of γ-aminobutyric acid and carbohydrates. Potassium-starved plants released less sugars, in particular glycerol, ribitol, fructose, and maltose, while under N deficiency lower amounts of amino acids were found in root exudates. Principal-component analysis revealed a clear separation in the variation of the root-exudate composition between Fe or P deficiency versus N or K deficiency in the first principal component, which explained 46% of the variation in the data. In addition, a negative correlation was found between the amounts of sugars, organic and amino acids released under deficiency of a certain nutrient and the diffusion coefficient of the respective nutrient in soils. We thus hypothesize that the release of dominant root exudates such as sugars, amino acids, and organic acids by roots may reflect an ancient strategy to cope with limiting nutrient supply. Copyright
Keyword Axenic culture
Exudate composition
Nutrient deficiency
Root exudates
Zea mays
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Agriculture and Food Sciences
 
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Created: Wed, 05 Mar 2014, 01:57:32 EST by Paul Dennis on behalf of School of Agriculture and Food Sciences