Differential gene expression patterns in potassium-starved and Caesium-treated plants
Ontology highlight
ABSTRACT:
ORGANISM(S): Arabidopsis thaliana
PROVIDER: GSE6825 | GEO | 2007/01/22
SECONDARY ACCESSION(S): PRJNA99145
REPOSITORIES: GEO
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Project description:At high concentrations ceasium (Cs) is toxic to plant growth. This toxic effect may occur when Cs blocks potassium (K) uptake mechanisms in plants. Consequently, plants starved of K and plants exposed to toxic concentrations of Cs should have similar gene expression patterns. To test this hypothesis, Arabidopsis will initially be grown on agar containing 1/10 MS salts before being transferred to either 1/10 MS nutrient solution (control plants), 1/10 MS nutrient solution containing 2 mM Cs, or 1/10 MS nutrient solution with no K. Roots and shoot will then be harvested seven days after transfer and used to challenge ATH1 GeneChips. Experimenter name: John Hammond; Experimenter phone: 01789 470382; Experimenter fax: 01789 470552; Experimenter institute: Warwick University; Experimenter address: Horticulture Research International; Experimenter address: Wellesbourne; Experimenter address: Warwick; Experimenter zip/postal_code: CV35 9EF; Experimenter country: UK Experiment Overall Design: 18 samples were used in this experiment
2008-06-15 | E-GEOD-6825 | biostudies-arrayexpress
Project description:At high concentrations ceasium (Cs) is toxic to plant growth. This toxic effect may occur when Cs blocks potassium (K) uptake mechanisms in plants. Consequently, plants starved of K and plants exposed to toxic concentrations of Cs should have similar gene expression patterns. To test this hypothesis, Arabidopsis will initially be grown on agar containing 1/10 MS salts before being transferred to either 1/10 MS nutrient solution (control plants), 1/10 MS nutrient solution containing 2 mM Cs, or 1/10 MS nutrient solution with no K. Roots and shoot will then be harvested seven days after transfer and used to challenge ATH1 GeneChips. Keywords: compound_treatment_design
2007-01-08 | GSE6160 | GEO
Project description:At high concentrations ceasium (Cs) is toxic to plant growth. This toxic effect may occur when Cs blocks potassium (K) uptake mechanisms in plants. Consequently, plants starved of K and plants exposed to toxic concentrations of Cs should have similar gene expression patterns. To test this hypothesis, Arabidopsis will initially be grown on agar containing 1/10 MS salts before being transferred to either 1/10 MS nutrient solution (control plants), 1/10 MS nutrient solution containing 2 mM Cs, or 1/10 MS nutrient solution with no K. Roots and shoot will then be harvested seven days after transfer and used to challenge ATH1 GeneChips.
2009-09-03 | E-NASC-61 | biostudies-arrayexpress
Project description:At high concentrations caesium (Cs) is toxic to plant growth. This toxic effect may occur when Cs blocks potassium (K) uptake mechanisms in plants. Consequently, plants starved of K and plants exposed to toxic concentrations of Cs should have similar gene expression patterns. To test this hypothesis, Arabidopsis will initially be grown on agar containing 1/10 MS salts before being transferred to either 1/10 MS nutrient solution (control plants), 1/10 MS nutrient solution containing 2 mM Cs, or 1/10 MS nutrient solution with no K. Roots and shoot will then be harvested seven days after transfer and used to challenge ATH1 GeneChips. Experiment Overall Design: Number of plants pooled:40-50
2008-06-14 | E-GEOD-6160 | biostudies-arrayexpress
Project description:Many signalling pathways are involved in controlling gene expression during plant senescence. Pathways involving SA, JA and ethylene have a role in senescence but none are essential for the senescence process to occur. The aim of this experiment is to classify senescence-enhanced genes into groups depending on the signalling pathways that regulate them. This will provide useful information on the relative importance of each signalling pathway during senescence and allow us to separate potential senescence-specific genes and pathways from the stress response pathways.Mutants in genes in the ethylene pathway (ein2) and the jasmonate pathway (coi1) and the NahG transgenic plant which is defective in the salicylic acid pathway will be grown until the mid flowering stage. Fully developed green and partially senescent leaves will be harvested from the plants at this stage. In addition, two different lines of Arabidopsis (Col5 glabrous and Col-0) will be grown as controls. Leaves will be harvested from the two control plants before flowering (green) and at mid flowering as above. The control plants will be harvested at two stages to identify the senescence- enhanced genes. The effects of each mutation on the senescence related expression of these genes will then be studied.Mutant RNAs will be isolated in duplicate. The two control accessions will act as replicates for the wild type. Two wild type accessions will be used to reduce possible differences that could be observed the mutants due to slight differences in background. Experimenter name = Vicky Buchanan-Wollaston Experimenter phone = 01789 470382 Experimenter fax = 01789 470552 Experimenter address = Horticulture Research International Experimenter address = Wellesbourne Experimenter address = Warwick Experimenter zip/postal_code = CV35 9EF Experimenter country = UK Keywords: genetic_modification_design; development_or_differentiation_design
2007-01-08 | GSE5727 | GEO
Project description:Many signalling pathways are involved in controlling gene expression during plant senescence. Pathways involving SA, JA and ethylene have a role in senescence but none are essential for the senescence process to occur. The aim of this experiment is to classify senescence-enhanced genes into groups depending on the signalling pathways that regulate them. This will provide useful information on the relative importance of each signalling pathway during senescence and allow us to separate potential senescence-specific genes and pathways from the stress response pathways.Mutants in genes in the ethylene pathway (ein2) and the jasmonate pathway (coi1) and the NahG transgenic plant which is defective in the salicylic acid pathway will be grown until the mid flowering stage. Fully developed green and partially senescent leaves will be harvested from the plants at this stage. In addition, two different lines of Arabidopsis (Col5 glabrous and Col-0) will be grown as controls. Leaves will be harvested from the two control plants before flowering (green) and at mid flowering as above. The control plants will be harvested at two stages to identify the senescence- enhanced genes. The effects of each mutation on the senescence related expression of these genes will then be studied.Mutant RNAs will be isolated in duplicate. The two control accessions will act as replicates for the wild type. Two wild type accessions will be used to reduce possible differences that could be observed the mutants due to slight differences in background. Experimenter name = Vicky Buchanan-Wollaston; Experimenter phone = 01789 470382; Experimenter fax = 01789 470552; Experimenter address = Horticulture Research International; Experimenter address = Wellesbourne; Experimenter address = Warwick; Experimenter zip/postal_code = CV35 9EF; Experimenter country = UK Experiment Overall Design: 10 samples were used in this experiment
2008-06-14 | E-GEOD-5727 | biostudies-arrayexpress
Project description:Background: The UK horticultural and agricultural industries routinely apply large amounts of inorganic fertiliser to maintain crop yield and quality, since chemical assays of soil nutrients are unreliable. Excessive fertiliser applications are costly and can lead to unnecessary pollution. A possible solution is to use sensor (GM or non-GM) technologies that exploit the changes in plant gene expression under incipient nutrient deficiency. Aim: The aim of this project is to use mutants with reduced leaf phosphate contents to identify genes upregulated in response to phosphate stress. Preliminary gene expression analysis has identified several phosphate responsive genes to be upregulated in the pho1 mutant. However, further replicates of the experiment are required to confirm these changes. Methods: Arabidopsis mutant pho1 (N8507) and its parent ecotype Columbia 2 (N907) will be grown on MS agar under identical conditions. RNA will be extracted from the rosette leaves of both parent and mutant and the same growth stage. By comparing the expression profiles, we will be able to differentiate between genes that are upregulated in leaves experiencing phosphate stress. Previously, two GeneChips have been used (mutant and parent) to provide preliminary data. A further two biological replicates are now required to confirm these results. Promoters and transcripts of these genes will underpin the development of novel sensor technologies, and knowledge of the gene expression profiles will improve our understanding of the physiology of plant mineral nutrition. Experimenter name = John Hammond Experimenter phone = 01789 470382 Experimenter fax = 01789 470552 Experimenter address = Plant Sciences Division Experimenter address = School of Biosciences Experimenter address = University of Nottingham Experimenter address = Sutton Bonington Campus Experimenter address = Loughborough Experimenter zip/postal_code = LE12 5RD Experimenter country = UK Keywords: genetic_modification_design
2007-01-08 | GSE5611 | GEO
Project description:Background: The UK horticultural and agricultural industries routinely apply large amounts of inorganic fertiliser to maintain crop yield and quality, since chemical assays of soil nutrients are unreliable. Excessive fertiliser applications are costly and can lead to unnecessary pollution. A possible solution is to use sensor (GM or non-GM) technologies that exploit the changes in plant gene expression under incipient nutrient deficiency. Aim: The aim of this project is to use mutants with reduced leaf phosphate contents to identify genes upregulated in response to phosphate stress. Preliminary gene expression analysis has identified several phosphate responsive genes to be upregulated in the pho1 mutant. However, further replicates of the experiment are required to confirm these changes. Methods: Arabidopsis mutant pho1 (N8507) and its parent ecotype Columbia 2 (N907) will be grown on MS agar under identical conditions. RNA will be extracted from the rosette leaves of both parent and mutant and the same growth stage. By comparing the expression profiles, we will be able to differentiate between genes that are upregulated in leaves experiencing phosphate stress. Previously, two GeneChips have been used (mutant and parent) to provide preliminary data. A further two biological replicates are now required to confirm these results. Promoters and transcripts of these genes will underpin the development of novel sensor technologies, and knowledge of the gene expression profiles will improve our understanding of the physiology of plant mineral nutrition. Experimenter name = John Hammond; Experimenter phone = 01789 470382; Experimenter fax = 01789 470552; Experimenter address = Plant Sciences Division; Experimenter address = School of Biosciences; Experimenter address = University of Nottingham; Experimenter address = Sutton Bonington Campus; Experimenter address = Loughborough; Experimenter zip/postal_code = LE12 5RD; Experimenter country = UK Experiment Overall Design: 6 samples were used in this experiment
2008-06-13 | E-GEOD-5611 | biostudies-arrayexpress
Project description:The aim of this study is to study gene expression in Brassica oleracea in shoot tissues of plants grown under contrasting P supplies (see Hammond JP et al., 2003, Plant Physiology, 132, 578-596 for background). Seeds of B. oleracea (var. alboglabra, A12dH) were first washed in 70% (v/v) ethanol/water, rinsed in distilled water and surface sterilised using 50% (v/v) domestic bleach/water. Seeds were rinsed and imbibed for 3 to 5 days in sterile distilled water at 4°C to break dormancy. Following imbibition, B. oleracea seeds were sown in un-vented, polycarbonate culture boxes (Sigma-Aldrich Company Ltd., Dorset UK). Seedlings were grown for 21 days on perforated polycarbonate discs (diameter 91 mm by 5 mm) placed on 75 ml of 0.8% (w/v) agar containing 1% (w/v) sucrose and a basal salt mix. Roots grew into the agar, but shoots remained on the opposite side of the disc. After 21 days, seedlings were transferred, still on polycarbonate discs, to a hydroponics system situated in a Saxcil growth cabinet (16 h daylength, set to 22°C and 80% humidity). Each polycarbonate disc was placed on a light-proof 500 ml beaker over 450 ml of nutrient solution. After 7 days, half the plants were transferred to nutrient solution containing no phosphate and the other half remained on full nutrient solution (control plants). Shoots were harvested 100 h after the withdrawal of P. !Samples were snap frozen in liquid nitrogen. RNA was extracted using the TRIzol extraction method and cleaned through a Qiagen RNeasy column. Experimenter name = Martin Broadley Experimenter phone = 0115 951 6382 Experimenter fax = 0115 951 6334 Experimenter institute = University of Nottingham Experimenter address = Plant Sciences Division Experimenter address = School of Biosciences Experimenter address = University of Nottingham Experimenter address = Sutton Bonington Experimenter address = Loughborough Experimenter zip/postal_code = LE12 5RD Experimenter country = UK Keywords: growth_condition_design
2007-01-08 | GSE5614 | GEO
Project description:Our aim is to study the circadian expression of genes to aid in our attempt of modelling the Arabidopsis circadian clock. Circadian microarray data have previously been published for plants after white light (WL)-dark cycles, using the 8k chip (Harmer et al. 2000). We intend to repeat this experiment using the 26k chips and are coordinating with Dr. Harmer, who is pursuing complementary experiments in UC Davis. Plants will be transferred to continuous WL after entrainment to 12h:12h light dark cycles. RNAs will be harvested every 4 hours over two days, with the same accession and sampling intervals used previously by Harmer et al. The two days of sampling provide internal replication. Our experience shows that this is the most economical design: it is easier to identify rhythms over a two-day timecourse than in two replicates of a single day. Hence: 13 RNA samples on 13 chips in total. METHOD: Seed was sown on MS agar plates with 3% sucrose, imbibed at 4 C for 96 hours. Seed was then entrained for 7 days at 22C, in cycles of 12 hours white light, 12 hours darkness. After 7 days they were transferred to constant white light at 22 C: this is time 0h. Tissue harvested at the time points shown after time 0. Experimenter name = Kieron Edwards Experimenter phone = 024 7652 8374 Experimenter fax = 024 7652 3701 Experimenter department = Department of Biological Sciences Experimenter institute = University of Warwick Experimenter address = Department of Biological Sciences Experimenter address = University of Warwick Experimenter address = Gibbet Hill Road Experimenter address = Coventry Experimenter zip/postal_code = CV4 7AL Experimenter country = UK Keywords: time_series_design, growth_condition_design
2007-01-08 | GSE5612 | GEO