Document Detail

Nitric oxide (NO): a key player in the senescence of Medicago truncatula root nodules.
MedLine Citation:
PMID:  22937888     Owner:  NLM     Status:  Publisher    
Nitric oxide (NO) is a signalling and defence molecule involved in diverse plant developmental processes, as well as in the plant response to pathogens. NO has also been detected at different steps of the symbiosis between legumes and rhizobia. NO is required for an optimal establishment of the Medicago truncatula-Sinorhizobium meliloti symbiotic interaction, but little is known about the role of NO in mature nodules. Here, we investigate the role of NO in the late steps of symbiosis. Genetic and pharmacological approaches were conducted to modulate the NO level inside root nodules, and their effects on nitrogen fixation and root nodule senescence were monitored. An increase in endogenous NO levels led to a decrease in nitrogen fixation and early nodule senescence, characterized by cytological modifications of the nodule structure and the early expression of a specific senescence marker. By contrast, a decrease in NO levels led to a delay in nodule senescence. Together, our results strongly suggest that NO is a signal in developmental as well as stress-induced nodule senescence. In addition, this work demonstrates the pivotal role of the bacterial NO detoxification response in the prevention of early nodule senescence, and hence the maintenance of efficient symbiosis.
Yvan Cam; Olivier Pierre; Eric Boncompagni; Didier Hérouart; Eliane Meilhoc; Claude Bruand
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-8-31
Journal Detail:
Title:  The New phytologist     Volume:  -     ISSN:  1469-8137     ISO Abbreviation:  New Phytol.     Publication Date:  2012 Aug 
Date Detail:
Created Date:  2012-9-3     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9882884     Medline TA:  New Phytol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
© 2012 The Authors New Phytologist © 2012 New Phytologist Trust.
Laboratoire des Interactions Plantes-Microorganismes (LIPM), INRA, UMR441, 24 Chemin de Borde Rouge - Auzeville, CS 52627, F-31326, Castanet-Tolosan Cedex, France; Laboratoire des Interactions Plantes-Microorganismes (LIPM), CNRS, UMR2594, 24 Chemin de Borde Rouge - Auzeville, CS 52627, F-31326, Castanet-Tolosan Cedex, France.
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