Document Detail

Systemic regulation of soybean nodulation by acidic growth conditions.
MedLine Citation:
PMID:  23054568     Owner:  NLM     Status:  MEDLINE    
Mechanisms inhibiting legume nodulation by low soil pH, although highly prevalent and economically significant, are poorly understood. We addressed this in soybean (Glycine max) using a combination of physiological and genetic approaches. Split-root and grafting studies using an autoregulation-of-nodulation-deficient mutant line, altered in the autoregulation-of-nodulation receptor kinase GmNARK, determined that a systemic, shoot-controlled, and GmNARK-dependent mechanism was critical for facilitating the inhibitory effect. Acid inhibition was independent of aluminum ion concentration and occurred early in nodule development, between 12 and 96 h post inoculation with Bradyrhizobium japonicum. Biological effects were confirmed by measuring transcript numbers of known early nodulation genes. Transcripts decreased on both sides of split-root systems, where only one side was subjected to low-pH conditions. Our findings enhance the present understanding of the innate mechanisms regulating legume nodulation control under acidic conditions, which could benefit future attempts in agriculture to improve nodule development and biological nitrogen fixation in acid-stressed soils.
Meng-Han Lin; Peter M Gresshoff; Brett J Ferguson
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2012-10-09
Journal Detail:
Title:  Plant physiology     Volume:  160     ISSN:  1532-2548     ISO Abbreviation:  Plant Physiol.     Publication Date:  2012 Dec 
Date Detail:
Created Date:  2012-12-11     Completed Date:  2013-05-16     Revised Date:  2013-07-11    
Medline Journal Info:
Nlm Unique ID:  0401224     Medline TA:  Plant Physiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2028-39     Citation Subset:  IM    
Australian Research Council Centre of Excellence for Integrative Legume Research, School of Agricultural and Food Sciences, University of Queensland, St. Lucia, Brisbane, Queensland 4072, Australia.
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MeSH Terms
Acids / pharmacology*
Aluminum / toxicity
Aluminum Silicates / pharmacology
Anion Transport Proteins / metabolism
Gene Expression Regulation, Plant / drug effects
Genes, Plant / genetics
Hydrogen-Ion Concentration / drug effects
Models, Biological
Plant Root Nodulation / drug effects*,  genetics
Plant Shoots / drug effects,  physiology
Root Nodules, Plant / drug effects,  genetics,  growth & development*
Soil / chemistry
Soybeans / drug effects,  genetics,  physiology*
Reg. No./Substance:
0/Acids; 0/Aluminum Silicates; 0/Anion Transport Proteins; 0/Soil; 0/nitrate transporters; 1318-00-9/vermiculite; 7429-90-5/Aluminum

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

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