Project description:In this project, seedlings of tomato (Solanum lycopersicum) ‘Money Maker’ plants overexpressing a glyoxalase I gene were treated under 20 µM Al3+ and salt (200 mM NaCl) for two weeks. The treatments were conducted in hydroponic solutions in a greenhouse at 24±2C without supplemental light. Roots harvested were immediately frozen in liquid nitrogen and stored at -80 oC. The treatment experiment was conducted at Agricultural Research Station, Tennessee State University, Nashville, TN 37209
Project description:In this project, seedlings of tomato (Solanum lycopersicum) ‘Money Maker’ plants transformed with a bar gene were treated under 20 µM Al3+ and salt (200 mM NaCl) for two weeks. The treatments were conducted in hydroponic solutions in a greenhouse at 24±2C without supplemental light. Roots harvested were immediately frozen in liquid nitrogen and stored at -80 oC. The treatment experiment was conducted at Agricultural Research Station, Tennessee State University, Nashville, TN 37209
Project description:cDNA macroarray expression profiling was carried out in poplar roots in order to identify genes regulated in response to exposition to copper stress. For this purpose, plants of a Populus deltoides clone grown in a hydroponic system during four weeks were incubated in a nutrient solution (Hoagland's modiefied salt, ¼ strength) supplemented with copper (0 µM (control), 30 µM and 60 µM). Roots were sampled at 12 and 24 h after exposition in a time-course experiment.
Project description:Transcriptional profiling of roots from 12 days-old Arabidopsis thaliana seedlings transfered to Pi-deficient medium in hydroponic solution in a 10 min, 30 min, and 2 hrs time course period.
Project description:Rooted sugarcane plantlets, originated from in vitro meristem culture (genotype SP80-3280, CTC, Brazil), were greenhouse acclimatized by initial cultivation on 1/20th strength Hoagland and Arnon (1950) nutrient solution. Nutrient solutions were aired from an oil-less compressor and replaced every 7 days, increasing nutrient concentration to ¼ strength in 3 weeks. Plants were then individually transferred to 2.8 L pots filled with fresh ¼ strength nutrient solution. After one week, half of the plants were transferred to fresh solution containing 250 µM Pi, while the other half was transferred to nutrient solution deprived of phosphate (Pi), with H2PO4 being replaced by H2SO4 (Muchhal et al., 1996). Roots from six plants from each treatment (0 and 250 µM Pi) were harvested 6, 12, 24 and 48 h after exposure to phosphate starvation and immediately frozen in liquid nitrogen. For each time point and each treatment, root samples were aggregated in three pools of two samples each. Extraction of total RNA was performed separately on each sample pool. Keywords: time course of stress response
Project description:After 24 hours of germination, Medicago sativa seedlings were grown with MS nutrient solution and 0, 50, 100 and and 200 microM Na2HAsO4 in a hydroponic system, for 24 hours. Roots were harvest for mRNA extraction and transcritpional analysis.
Project description:Transcriptional profiling of roots from 12 days-old Arabidopsis thaliana seedlings transfered to Pi-deficient medium in hydroponic solution in a 10 min, 30 min, and 2 hrs time course period. A dye balanced modified loop design was implemented. This experiment involved a total of twelve sets of microarray hybridizations, including direct and dye swap comparisons between treatments as well as across time points for the same treatment. This design allowed us to determine differences in gene expression between Pi-deprived and control seedlings, and whether the differences were time dependent. Four biological replicates representing each sampling point were obtained.
Project description:affy_root-dvt-nitrogen_medicago. The biological question is the study of root development adaptation to external nitrogen availability. One of the typical responses to low N provision consists of an increased root branching which promotes soil exploration. In order to differentiate between genes specifically involved in nitrate response and genes of root development, we had performed experiments on both a wild type and a mutant affected in root architecture, both supplied with two different levels of nitrate. Global gene expression profiling of root cells using microarray analysis will be conducted to identify genes expressed during root branching. First, analysing the differential gene expression between the wild type and the mutant both at low and high level of nitrate, we will identify genes of root development but also genes specifically involved in nitrate response. Then, additional comparisons will concern the modifications of wild type and mutant gene expression between the two levels of nitrate. These genes will be compared to those found to be expressed in the wild type roots under submitted to various nitrogen sources (Ruffel et al., 2008). All together these results will allow us to determine which genes, among the firstly underlined, are specifically involved in root development. The kinetics of expression in different tissues of the most relevant of these genes will be further analysed by qRT-PCR. Three successive experiments in growth chamber were performed on two different genotypes of Medicago truncatula. Each experiment constituted a biological replicate. For each of them, after 4 days of seed cold-treatment followed by 4 days of germination, individual plantlets were transferred onto hydroponic culture tanks containing vigorously aerated nutrient solution. Each tank contained 6 plantlets of J5 and 6 plantlets of the mutant. On one shelf of the growth chamber, nutrient solution in the tanks was supplemented by 1mM of KNO3; on the other shelf, the level of KNO3 in the solution was of 10mM. Nutrient solution was renewed every week. Roots of the two genotypes were harvested separately but at the same time, 10 days after the plantlets transfer onto hydroponic culture tanks. Keywords: dose response, wt vs mutant comparison