Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

Time-course transcriptome analysis of Sinorhizobium medicae (MD4 strain) in mature nodules of Medicago truncatula grown in split-root under different nitrogen (N) supply

ABSTRACT: The experiment aim is the identification of the transcriptional response of mature nodules of Medicago truncatula inoculated with the strain MD4 of Sinorhizobium medicae in response to different nitrogen (N) supply (N-satiety and N-deficient conditions). We performed a time-course (1 and 3 days treatment) split-root experiment to identify plant systemic responses: the root systems of nodulated symbiotic plants were divided into two compartments, one of them treated and the other kept on control conditions. Nodules were isolated from the non-treated side of the split root and total RNA isolated for RNAseq analysis. To analyse Sinorhizobium medicae MD4 expression, a ribosomal RNA depletion protocol was performed before library preparation.

INSTRUMENT(S): Illumina HiSeq 2500

ORGANISM(S): Sinorhizobium medicae

SUBMITTER: Marc Tauzin

PROVIDER: E-MTAB-8598 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

Responses of mature symbiotic nodules to the whole-plant systemic nitrogen signaling.

Lambert Ilana I Pervent Marjorie M Le Queré Antoine A Clément Gilles G Tauzin Marc M Severac Dany D Benezech Claire C Tillard Pascal P Martin-Magniette Marie-Laure ML Colella Stefano S Lepetit Marc M

Journal of experimental botany 20200801 16

In symbiotic root nodules of legumes, terminally differentiated rhizobia fix atmospheric N2 producing an NH4+ influx that is assimilated by the plant. The plant, in return, provides photosynthates that fuel the symbiotic nitrogen acquisition. Mechanisms responsible for the adjustment of the symbiotic capacity to the plant N demand remain poorly understood. We have investigated the role of systemic signaling of whole-plant N demand on the mature N2-fixing nodules of the model symbiotic associatio ...[more]

PMID: 32386062

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Project description:affy_nitrogen_medicago - affy_nitrogen_medicago - Experiment has been designed to characterize the molecular expression patterns associated to a contrasted modification of the nitrogen status of the whole plant. The systemic effects of nitrogen status modifications are investigated and compared on non nodulated plant supplied with NO3, NH4 or nodulated plants (Sinorhizobium meliloti 2011) supplied with air. The root systems were separated in two compartments of unequal sizes (split root system). Two treatments were applied on the larger compartment in order to modulate the nitrogen status of the plant: for the S treatment, roots are supplied with nutrient solution containing 10 mM NH4NO3,, whereas for the C treatment, roots are supplied with nitrogen free medium. In the case of N2 fixing plants, N limitation was obtained by replacing air by a mixture of Ar and O2 80 per cent and 20 per cent. The effects of these treatments were investigated on roots of the minor compartment supplied continuously with either NO3 1 mM, NH4 1 mM or air (N2) and on the shoots. We were also interested in the molecular expression patterns associated to the roots deprived of N.-The root system of non-nodulated (NO3- and NH4+) or nodulated (N2) plants is split into two unequal parts and each one is installed in a separate compartment. For the S treatement, the major root part is supplied with NH4NO3 10 mM whereas the minor part is supplied with either NO3- 1mM, NH4+ 1mM or N2. For the C treatement, the major root part is supplied with nitrogen-free nutrient solution whereas the minor part is supplied with either NO3- 1mM, NH4plus 1mM or N2. Each treatement is four days long. Samples of roots of six biological types (NO3S, NO3C, NH4S, NH4C, N2S and N2C) were collected. Two biological repeats per biological types have been analyzed. The effect of the S and C treatments were investigated for each N sources by comparing Affymetrix transcriptomes (NO3C vs NO3S, NH4C vs NH4S, N2C vs N2S). Experiment Overall Design: 26 arrays - medicago

Dataset Information

Time-course transcriptome analysis of Sinorhizobium medicae (MD4 strain) in mature nodules of Medicago truncatula grown in split-root under different nitrogen (N) supply

Publications

Responses of mature symbiotic nodules to the whole-plant systemic nitrogen signaling.

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