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Transcriptomic and metabolic responses of mycorrhizal roots to nitrogen patches under field conditions
Dan Ruzicka, Donald Danforth Plant Science Center, Saint Louis, Missouri (druzicka@danforthcenter.org)
Experiment design (30 hybridizations)
genotype
•wildtype •mutant(rmc)
nutrient
•control •low nitrogen •high nitrogen

This experiment has been imported by PLEXdb from NCBI GEO (GSE30270)

Series_summary:
Arbuscular mycorrhizal (AM) fungi contribute to ...[complete overview]

Experiment     Expression     Hybridizations & Samples     Quality Control     Compare Treatments     Downloads    

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Experiment Name: Transcriptomic and metabolic responses of mycorrhizal roots to nitrogen patches under field conditions
Accession No: LE14
Microarray: tomato10k
Visibility: public
Experiment Type:
Experiment Factor(s):
genotype
•wildtype   •mutant(rmc)
nutrient
•control   •low nitrogen   •high nitrogen
Quality Control: biological replicates
Treatment summary:
 genotype  nutrient  # replicates
 wildtype  control  5
 wildtype  low nitrogen  5
 wildtype  high nitrogen  5
 mutant(rmc)  control  5
 mutant(rmc)  low nitrogen  5
 mutant(rmc)  high nitrogen  5
Total hybridizations: 30
Description: This experiment has been imported by PLEXdb from NCBI GEO (GSE30270)

Series_summary:
Arbuscular mycorrhizal (AM) fungi contribute to plant nutrient uptake in systems managed with reduced fertilizer inputs such as organic agriculture and natural ecosystems by extending the effective size of the rhizosphere and delivering mineral. 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. 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 nonmycorrhizal mutant were grown at an organic farm in soil that contained an active AM extraradical hyphal network and soil microbe community. The majority of genes regulated by upon enrichment of nitrogen were similarly expressed in mycorrhizal and nonmycorrhizal 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. 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.

Series_overall_design:
30 samples were analyzed. There were 2 genotypes (wildtype and mutant) and 3 treatments (two N treatments and a water control) for a total of 6 groups. Each group had 5 biological replicates.
Publication: none
Created: 2011-08-01 11:56:30
Last Update: 2011-08-05 10:03:29
Released: 2011-08-05
GEO Accession GSE30270
Submitter: PLEXdb Curator
Name: Dan Ruzicka
Institution: Donald Danforth Plant Science Center, Saint Louis, Missouri
Head of Laboratory: Daniel P Schachtman
email(s):
Homepage:

 
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