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Series GSE22966 Query DataSets for GSE22966
Status Public on Dec 01, 2011
Title A systemic view of coordinated root responses to NO3- heterogeneous environment in Arabidopsis
Organism Arabidopsis thaliana
Experiment type Expression profiling by array
Summary We investigated the morphological roots decisions of Arabidopsis in a NO3- heterogeneous medium. To do so, we used the Split-Root System which is an experimental set up to assess root decisions in nutrient heterogeneous medium. Split-root plants have been subjected to three different treatments. ‘Control KNO3’ plants received KNO3 on both sides of the root system (C.NO3) and ‘Control KCl’ plants received KCl on both sides (C.KCl) as a nitrogen deprivation treatment. 'Split' plants received KNO3 on one side (Sp.NO3) and KCl on the other side (Sp.KCl) of the root system to assess the root decision-making in a heterogeneous environment.
We observed that the total lateral roots length in the Sp.NO3 and C.KCl compartments is induced as compared to C.NO3 and Sp.KCl compartments. This corresponds to a root proliferation response in strategic territories to compensate the nitrogen deprivation. To decipher the molecular basis of this morphological root response on day 4 after the beginning of the split-root treatment, we used a transcriptomic approach on roots at 2hours, 8 hours and 2 days after the beginning of the treatment. From our microarrays data, we have identified a global set of 150 genes for which the expression pattern match with the lateral roots responses. Among them, we selected 8 early marker genes of the root decisions, which allowed us to show that the shoots and the NO3- itself are essential for the decision. Finally, we tested the role of the cytokinins phytohormones as a NO3--derived systemic signal in the root decision. Interestingly, we have demonstrated that the systemic cytokinins are involved into the decision of inducing maker genes expression and making lateral roots in the Sp.NO3 compartment specifically.
 
Overall design 36 samples were analyzed. They correspond to three biological repeats of the C.NO3, Sp.NO3, Sp.KCl and C.KCl root samples (12 samples) that we have collected at 2hours, 8 hours and 2 days (12 samples x 3 time points) after the beginning of the split-root treatment. We analyzed the normalized microarrays data by using a three way ANOVA. The three factors of the ANOVA are 1) presence/absence of NO3-, 2) split/control and 3) time. The measures of the significance of each probe were done by the Q-value method (q<0.2, panova<0.001). The genes differentially expressed between the C.NO3 and Sp.NO3 samples, and the C.KCl and Sp.KCl samples were determined by the post-hoc Tukey test (p<0.05).
 
Contributor(s) Ruffel S, Krouk G, Coruzzi GM, Birnbaum K
Citation(s) 22025711
Submission date Jul 15, 2010
Last update date Aug 15, 2018
Contact name Sandrine Ruffel
E-mail(s) sandrine0ruffel@gmail.com
Phone 2129954918
URL http://coruzzilab.bio.nyu.edu/home/
Organization name New York University
Department Biology
Lab Coruzzi
Street address 100 Washington Square East. 1009 Main Building
City NYC
State/province NY
ZIP/Postal code 10012
Country USA
 
Platforms (1)
GPL198 [ATH1-121501] Affymetrix Arabidopsis ATH1 Genome Array
Samples (36)
GSM566858 Control KNO3 roots - 2hours - repeat 1
GSM566859 Control KNO3 roots - 2hours - repeat 2
GSM566860 Control KNO3 roots - 2hours - repeat 3
Relations
Affiliated with GSE69995
BioProject PRJNA127857

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Supplementary file Size Download File type/resource
GSE22966_RAW.tar 81.1 Mb (http)(custom) TAR (of CEL)
Processed data included within Sample table
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