Document Detail


Nitric oxide (NO): a key player in the senescence of Medicago truncatula root nodules.
MedLine Citation:
PMID:  22937888     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
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.
Authors:
Yvan Cam; Olivier Pierre; Eric Boncompagni; Didier Hérouart; Eliane Meilhoc; Claude Bruand
Related Documents :
7635758 - The role of lectins in plant defence.
23332498 - Gh3 expression and iaa-amide synthetase activity in pea (pisum sativum l.) seedlings ar...
11986758 - Gibberellin biosynthesis in plants and fungi: a case of convergent evolution?
24861588 - An assessment of metal contamination risk in sediments of hara biosphere reserve, south...
24061058 - Printing ink and paper recycling sources of tmdd in wastewater and rivers.
24689148 - Long-lived organisms provide an integrative footprint of agricultural land use.
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.
Affiliation:
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.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  The effects of therapeutic x-ray doses on mechanical, chemical and physical properties of poly methy...
Next Document:  Sarcoidosis in a 65-year-old woman presenting with a lung mass and pericardial effusion: a case repo...