Document Detail


Validamycin A improves the response of Medicago truncatula plants to salt stress by inducing trehalose accumulation in the root nodules.
MedLine Citation:
PMID:  19232773     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
In this work, the role of trehalose as an osmoprotectant against salt stress conditions was examined in root nodules of Medicago truncatula. For this purpose, we used validamycin A, a potent trehalase inhibitor, in order to induce trehalose accumulation. Validamycin A induced an increase of trehalose concentration in root nodules of M. truncatula by inhibiting trehalase activity; no effect on trehalose concentration was observed in roots and leaves. Trehalose accumulation was accompanied by a decrease in sucrose and starch content, indicating interference with carbohydrate partitioning in the plants. Under salinity conditions, sucrose accumulation appears to be induced in M. truncatula to protect nodule functioning by the inhibition of sucrose catabolism by sucrose synthase and alkaline invertase activities. However, trehalose accumulation induced by val A in nodules improved the response to salinity by increasing plant dry weight (PDW), and no effects of validamycin A on nitrogenase activity and PDW were observed in nonsalinized plants.
Authors:
Miguel López; Noel A Tejera; Carmen Lluch
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2009-02-20
Journal Detail:
Title:  Journal of plant physiology     Volume:  166     ISSN:  1618-1328     ISO Abbreviation:  J. Plant Physiol.     Publication Date:  2009 Jul 
Date Detail:
Created Date:  2009-06-22     Completed Date:  2009-09-02     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9882059     Medline TA:  J Plant Physiol     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  1218-22     Citation Subset:  IM    
Affiliation:
Departamento de Fisiología Vegetal, Facultad de Ciencias, Universidad de Granada, Campus de Fuentenueva s/n, 18071 Granada, Spain. mlgomez@ugr.es
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MeSH Terms
Descriptor/Qualifier:
Enzyme Activation / drug effects
Gene Expression Regulation, Plant / drug effects
Inositol / analogs & derivatives,  pharmacology
Medicago truncatula / drug effects*,  metabolism*
Nitrogen Fixation / drug effects
Root Nodules, Plant / drug effects*,  metabolism
Sodium Chloride / pharmacology*
Stress, Physiological*
Trehalase / metabolism
Trehalose / metabolism*
Chemical
Reg. No./Substance:
37248-47-8/validamycin A; 6917-35-7/Inositol; 7647-14-5/Sodium Chloride; 99-20-7/Trehalose; EC 3.2.1.28/Trehalase

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