Systemic regulation of soybean nodulation by acidic growth conditions

Lin, Meng-Han, Gresshoff, Peter M. and Ferguson, Brett J. (2012) Systemic regulation of soybean nodulation by acidic growth conditions. Plant Physiology, 160 4: 2028-2039. doi:10.1104/pp.112.204149

Author Lin, Meng-Han
Gresshoff, Peter M.
Ferguson, Brett J.
Title Systemic regulation of soybean nodulation by acidic growth conditions
Journal name Plant Physiology   Check publisher's open access policy
ISSN 0032-0889
Publication date 2012-12-01
Sub-type Article (original research)
DOI 10.1104/pp.112.204149
Volume 160
Issue 4
Start page 2028
End page 2039
Total pages 12
Place of publication Rockville, MD, United States
Publisher American Society of Plant Biologists
Language eng
Abstract Mechanisms inhibiting legume nodulation by low soil pH, though highly prevalent and economically significant, are poorly understood. We addressed this in soybean using a combination of physiological and genetic approaches. Split-root and grafting studies using an Autoregulation-Of-Nodulation (AON)-deficient mutant line, altered in the AON 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 aluminium ion concentration (AlCl3), and occurred early in nodule development, between 12-96 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 splitroot 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.
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Centre for Integrative Legume Research Publications
Official 2013 Collection
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Citation counts: TR Web of Science Citation Count  Cited 14 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 17 times in Scopus Article | Citations
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Created: Wed, 17 Oct 2012, 22:10:58 EST by Dr Brett Ferguson on behalf of Centre for Integrative Legume Research