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Series GSE45576 Query DataSets for GSE45576
Status Public on Sep 01, 2013
Title Nitric oxide-fixation in plants: A new pathway enabling the use of nitric oxide as nitrogen source
Organism Arabidopsis thaliana
Experiment type Expression profiling by array
Summary Of all the essential nutrients, nitrogen is the one most often limiting for plant growth. Nitrogen can be taken up by plants in two ways. One possibility is through ammonium and nitrate, which are the predominate inorganic forms of nitrogen in soils. The second possibility is the uptake of air-born nitrogen through plant-associated mircoorganisms in root nodules. The majority of plants able to form such nitrogen-fixing root nodules are in the legume family Fabaceae. Here we present a third possibility – a new pathway, termed as nitric oxide (NO)-fixation pathway, which allows plants to fix atmospheric NO and to use it for better growth and development.
We identified non-symbiotic hemoglobin class 1 (AtGLB1) and class 2 (AtGLB2) as key proteins of the NO-fixation pathway. In an NO enriched environment NO-fixation is enhanced considerably in plants overexpressing AtGLB1 or AtGLB2 genes. NO uptake resulted in four-fold higher nitrate levels in these plants compared to NO-treated wild-type plants. Correspondingly, the growth parameters like rosettes size and weight, vegetative shoot thickness and also seed yield were 25%, 40%, 30%, and 20% higher, respectively, in the overexpression lines in comparison to wild-type plants. Our results highlight the existence of a NO-fixing pathway in plants. We demonstrated that plant non-symbiotic hemoglobin proteins can fix atmospheric NO and convert it to nitrate, which is further introduced into the N-metabolism. We assume that our results might provide new insights into the field of crop science research and that the NO-fixation capability might serve as a new economically important breeding trait for enhancing biomass, fruit, and seed production. Modifying this pathway might be a promising approach for better and more environment-friendly supply of nitrogen. For example crop plant hemoglobin proteins could be improved for their NO-fixing capability and their expression levels could be increased.
Overall design WT-Arabidopsis thaliana plants were fumigated with Ambient NO and 3 ppm NO air in three completely independent biological experiments. Total RNA was isolated from four-week old rosette leaves of these plants to determine the gene expression signature of each samples using Agilent one-color microarray. Differences in the gene expression signatures between Ambient NO and 3 ppm NO treated samples were analyzed to see the effect of NO fumigation on the WT Arabidopsis plants at the transcript level.
Contributor(s) Kuruthukulangarakoola GT, Lindermayr C
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Submission date Mar 28, 2013
Last update date Sep 03, 2013
Contact name Gitto Thomas Kuruthukulangarakoola
Organization name Helmholtz Zentrum München
Department Biochemical Plant Pathology
Lab Lindermayr
Street address Ingolsteadter Landstrasse 1
City Nueherberg
ZIP/Postal code 85764
Country Germany
Platforms (1)
GPL16892 Agilent-029132 At8X60 [Probe Name version]
Samples (6)
GSM1109948 WT-Leaf_4week_AmbientNO_rep1
GSM1109949 WT-Leaf_4week_AmbientNO_rep2
GSM1109950 WT-Leaf_4week_AmbientNO_rep3
BioProject PRJNA194611

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Supplementary file Size Download File type/resource
GSE45576_RAW.tar 25.2 Mb (http)(custom) TAR (of TXT)
Processed data included within Sample table

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