Project description:au11_04_benzene - benzene effects on brassica leaves - Improving the knowledge of the metabolic pathways of benzene in higher plants. - Cabbages (Brassica oleracea variety Prover), placed in a 300L exposure chamber, are directly subjected to a single dose of benzene (3ppm) for 24 hours.
Project description:The aim of the experiment was to identify the transcriptional changes between wild Brassica oleraceae lines (Winspit) and 2 cultivated lines (purple sprouting broccoli and savoy cabbage) that show different biofumigation phenotypes. Fully expanded leaves were compared from 8 week old plants.
Project description:Plant microRNAs are short (~21 nt), non-coding molecules that regulate gene expression by targeting mRNA cleavage or protein translation inhibition. In this manner, they play many important roles in the cells of living organisms. One of the plant species in which the entire set of miRNAs has not been yet completely identified is Brassica oleracea var. capitata (cabbage). For this reason and for the economic and nutritional importance of this food crop, Illumina high-throughput small RNAs sequencing has been performed to discover novel and conserved miRNAs in the mature cabbage leaves. In this study, raw reads generated from three small RNA libraries were bioinformatically processed and further analyzed to select sequences homologous to known B. oleracea and other plant miRNAs. As a result of this step, 267 conserved miRNAs (belonging to 62 families) have been discovered. The remaining unannotated tags were used in the prediction and evaluation of novel miRNAs, which resulted in the 26 potential miRNAs proposal. The expression of 13 selected miRNAs was analyzed by northern blot hybridization. To determine the functions and processes that these molecules may potentially regulate in cabbage leaves, GO annotation, GO enrichment analysis and KEGG (Kyoto Encyclopedia of Genes and Genomes) pathway mapping of the predicted targets were performed. Taken together, for the first time, the large set of miRNAs was identified in the mature cabbage leaves. Potential target designation for these miRNAs may suggest their important role in the plant growth, development and other primary biological processes. The presented study not only supplements the knowledge about B. oleracea miRNAs, but also may be used in other researches concerning the improvement of the cabbage cultivation.
Project description:Understanding plant’s response mechanisms against pathogenesis is fundamental for the development of resistant crop varieties and more productive agriculture. In this regard, ‘omic’ approaches are heralded as valuable technologies. In this work, combining iTRAQ technology with mass spectrometry, the proteomes from leaves of Brassica oleracea plants infected with Xanthomonas campestris pv. campestris (Xcc) and control plants at two different post-infection times were compared.
Project description:Understanding plant’s response mechanisms against pathogenesis is fundamental for the development of resistant crop varieties and more productive agriculture. In this regard, ‘omic’ approaches are heralded as valuable technologies. In this work, combining iTRAQ technology with mass spectrometry, the proteomes from leaves of Brassica oleracea plants infected with Xanthomonas campestris pv. campestris (Xcc) and control plants at two different post-infection times were compared.
Project description:Gene expression changes during the initial stages of black spot disease caused by Alternaria brassicicola on Brassica oleracea (Brassica oleracea var. capitata f. alba, white cabbage) leaves were investigated with Arabidopsis thaliana oligonucleotide microarrays. Transcriptional profiling of infected B. oleracea leaves revealed that photosynthesis was the most negatively regulated biological process. The negative regulation of 6 photosynthesis-related genes, mainly the genes involved in the photosynthesis light reaction and Calvin cycle, was observed as early as 12 hours post infection (hpi). It progressed through 48-hpi stage, when 44 down-regulated photosynthesis-related genes were detected. The analyses of infected leaves at microscopic, ultrastructural and physiological levels supported the microarray-based observations and indicated that the photosynthetic processes are suppressed in B. oleracea as a result of the fungal infection.
Project description:au12-01_detox; Improving the knowledge of the metabolic pathways of benzene in higher plants Cabbages (Brassica oleracea Var. Prover)are directly submitted to a one dose of benzene (3ppm) during 1 hour or 3 hours. The comparison is realized between samples treated and untreated to the benzene for both exhibitions.
Project description:The fullerenes, a kind of carbon nanoparticles, have potential for enhanced stress tolerance in plants. While the positive effects of polyhydroxy fullerene—fullerol on plants in response to drought at the physiological level have been documented, the molecular mechanism in Brassica napus are not entirely understood. In this study, exogenous fullerol was applied to the leaves of B. napus seedlings given drought. The leaves of B. napus seedlings in each treatment (sufficient water condition, drought, and drought combined with fullerol) were used to conduct the molecular mechanism using transcriptomic analysis.
Project description:The effects of the aromatic hydrocarbons benzene and toluene on Nitrosomonas europaea, a nitrifying bacterium that plays an important role in the removal of nitrogen from wastewater treatment plants, were studied in batch reactors. Exposure to 20 M toluene and 40 M benzene resulted in a 50% reduction in nitrifying activity after 1 h. However, Affymetrix microarray experiments detected no significant changes in gene expression in toluene exposed cells. Cells exposed to benzene were found to up-regulate a gene cluster (NE 1545 - NE 1551). This gene cluster appears to be involved with fatty-acid metabolism, lipid and membrane protein biosynthesis. TEM experiments reveal that cells exposed to benzene decrease the thickness of their membrane and the membrane becomes more structured. Keywords: stress response, benzene, toluene
