Document Detail


Organic acid metabolism and root excretion of malate in wheat cultivars under aluminium stress.
MedLine Citation:
PMID:  21055957     Owner:  NLM     Status:  In-Process    
Abstract/OtherAbstract:
The effects of aluminium (Al) on the metabolism of organic acids synthesised via nonphotosynthetic carbon fixation in the roots and on malate exudation were investigated in Al-tolerant Shirosanjyaku (SH) and Al-sensitive Chikushikomugi (CK) wheat cultivars labelled with bicarbonate-(14)C. Aluminum triggered the excretion of (14)C into the solution, especially in the SH that excreted 2.5 times more (14)C than the CK. The loss of radioactivity (about 10%) into the solution represented a small drain in the (14)C reserve found in the roots. In the organic acid fraction within the roots, malate contained the greatest amount of (14)C, and this amount decreased rapidly with time in both cultivars. The disappearance of radioactivity in the malate resulted from metabolism and translocation rather than to root efflux. Aluminium decreased the malate concentrations in roots of both cultivars. The Al-sensitive cultivar had higher concentrations of malate regardless of the presence of Al. It was therefore assumed that the decrease of malate concentration in roots under Al stress did not result from the decline in malate synthesis but due to an increase in malate decomposition. This response was interpreted as the result of the Al-induced stress and not as the cause of a differential Al-tolerance between the wheat cultivars. An important component of the differential Al tolerance between SH and CK is the greater ability of the Al-tolerant cultivar to excrete malate from the roots, which is independent of its internal concentration in the roots.
Authors:
Leide Rovênia Miranda de Andrade; Motoki Ikeda; Lourdes Isabel Velho do Amaral; Junji Ishizuka
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-10-12
Journal Detail:
Title:  Plant physiology and biochemistry : PPB / Société française de physiologie végétale     Volume:  49     ISSN:  1873-2690     ISO Abbreviation:  Plant Physiol. Biochem.     Publication Date:  2011 Jan 
Date Detail:
Created Date:  2010-12-24     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9882449     Medline TA:  Plant Physiol Biochem     Country:  France    
Other Details:
Languages:  eng     Pagination:  55-60     Citation Subset:  IM    
Copyright Information:
Copyright © 2010 Elsevier Masson SAS. All rights reserved.
Affiliation:
Department of Agric. Chemistry, Kyushu University, Fukuoka 812-81, Japan. leide@cpac.embrapa.br
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