Abstract
Background
Arbuscular mycorrhizal (AM) fungi contribute to plant nutrient uptake in systems managed with reduced fertilizer and pesticide inputs such as organic agriculture by extending the effective size of the rhizosphere and delivering minerals to the root. Connecting the molecular study of the AM symbiosis with agriculturally- and ecologically-relevant field environments remains a challenge and is a largely unexplored research topic.
Methods
This study utilized a cross-disciplinary approach to examine the transcriptional, metabolic, and physiological responses of tomato (Solanum lycopersicum) AM roots to a localized patch of nitrogen (N). A wild-type mycorrhizal tomato and a closely-related non-mycorrhizal mutant were grown at an organic farm in soil that contained an active AM extraradical hyphal network and soil microbe community.
Results
The majority of genes regulated by upon enrichment of nitrogen were similarly expressed in mycorrhizal and non-mycorrhizal roots, suggesting that the primary response to an enriched N patch is mediated by mycorrhiza-independent root processes. However where inorganic N concentrations in the soil were low, differential regulation of key tomato N transport and assimilation genes indicate a transcriptome shift towards mycorrhiza-mediated N uptake over direct root supplied N. Furthermore, two novel mycorrhizal-specific tomato ammonium transporters were also found to be regulated under low N conditions. A conceptual model is presented integrating the transcriptome response to low N and highlighting the mycorrhizal-specific ammonium transporters.
Conclusions
These results enhance our understanding of the role of the AM symbiosis in sensing and response to an enriched N patch, and demonstrate that transcriptome analyses of complex plant-microbe-soil interactions provide a global snapshot of biological processes relevant to soil processes in organic agriculture.
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Abbreviations
- AM:
-
arbuscular mycorrhiza
- N:
-
nitrogen
- P:
-
phosphate
- Pi:
-
inorganic phosphate
- Zn:
-
zinc
- S:
-
sulfur
- Cu:
-
copper
- PT:
-
phosphate transporter
- NH +4 :
-
ammonium
- NO −3 :
-
nitrate
- AMT:
-
ammonium transporter
- NRT:
-
nitrate transporter
- PSR:
-
phosphate starvation response
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Acknowledgements
This research was supported by the National Science Foundation Environmental Genomics grant number 0723775 to DPS and LEJ. We thank Julie Chou, Kimberly Jacobs, Joel Kramer, Julien Linares, Walter Lopez, Annie Young-Matthews and other members of the Jackson lab for their assistance with field work and sample processing, the University of Missouri DNA Core Facility for microarray processing, the Danforth Center Proteomics and Mass Spectrometry Facility for plant hormone analysis, and Lauren McIntyre for consultation regarding microarray analysis.
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Responsible Editor: Peter Christie.
Daniel R. Ruzicka and Natasha T. Hausmann contributed equally to this work.
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Online Resource 1
Detailed materials and methods description of acidic plant hormone analysis by LC-MS/MS. (DOC 44 kb)
Online Resource 2
Complete data table of Affymetrix microarray analysis across all samples, treatments, and genotypes. Columns include Affymetrix probeset ID and log base 2 (signal intensity) values for each sample. (XLS 7082 kb)
Online Resource 3
Primer sequences for qPCR (DOC 31.5 kb)
Online Resource 4
Selected tomato genes with significantly different expression between the mycorrhizal wild-type (76R MYC+) and non-mycorrhizal mutant (rmc) identified by Affymetrix microarray analysis. Columns include Affymetrix probset ID, fold change, FDR adjusted p-value, and annotation information. (XLS 90 kb)
Online Resource 5
Tomato genes that differ significantly by ammonium treatment (water, 6.5 μg 15NH4-N, or 65 μg 15NH +4 -N per gram of soil) identified by Affymetrix microarray analysis. Columns include Affymetrix probset ID, fold change, FDR adjusted p-value, and annotation information. (XLS 204 kb)
Online Resource 6
Tomato genes similarly regulated by the nitrogen patch treatments between field and greenhouse (Ruzicka et al. 2010) studies using field soil. (DOC 74 kb)
Online Resource 7
Physiological analysis of field-grown tomato plants (DOC 24.5 kb)
Online Resource 8
Nutrient analysis of plants grown for production biomass (DOC 36 kb)
Online Resource 9
Phylogenetic analysis of plant ammonium transporters including known Lotus japonicus and Medicago truncatula mycorrhizal-specific AMTs and new tomato mycorrhizal specific AMT4 and AMT5 reported here. (DOC 30 kb)
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Ruzicka, D.R., Hausmann, N.T., Barrios-Masias, F.H. et al. Transcriptomic and metabolic responses of mycorrhizal roots to nitrogen patches under field conditions. Plant Soil 350, 145–162 (2012). https://doi.org/10.1007/s11104-011-0890-z
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DOI: https://doi.org/10.1007/s11104-011-0890-z