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The effect of sucrose and sulfamethoxazole on the Arabidopsis transcriptome

ABSTRACT: A chemical screen was performed in search of compounds that modify plant responses to sucrose. This screen uncovered that sulfamethoxazole (SMX), a folate biosynthesis inhibitor, acted synergistically with sucrose to inhibit hypocotyl elongation, suggesting interaction between these two pathways. Transcriptome analysis was performed to identify changes in transcript abundance that may underpin crosstalk between sucrose and SMX. Three-day-old dark-grown seedlings were treated to sucrose and SMX at concentrations that induced no change in hypocotyl elongation when administered independently, yet restricted elongation when both were present in the growth media (10mM and 0.2µM, respectively). This analysis uncovered multiple core auxin signalling components that exhibit altered transcript abundance in response to co-treatment with sucrose and SMX, suggesting that auxin signalling mediates crosstalk between these two pathways. This study highlights an input through which metabolic status can shape plant growth and development through hormone signalling.

ORGANISM(S): Arabidopsis thaliana

PROVIDER: GSE37484 | GEO | 2013/06/30

SECONDARY ACCESSION(S): PRJNA161019

REPOSITORIES: GEO

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The effect of sucrose and sulfamethoxazole on the Arabidopsis transcriptome

Project description:A chemical screen was performed in search of compounds that modify plant responses to sucrose. This screen uncovered that sulfamethoxazole (SMX), a folate biosynthesis inhibitor, acted synergistically with sucrose to inhibit hypocotyl elongation, suggesting interaction between these two pathways. Transcriptome analysis was performed to identify changes in transcript abundance that may underpin crosstalk between sucrose and SMX. Three-day-old dark-grown seedlings were treated to sucrose and SMX at concentrations that induced no change in hypocotyl elongation when administered independently, yet restricted elongation when both were present in the growth media (10mM and 0.2µM, respectively). This analysis uncovered multiple core auxin signalling components that exhibit altered transcript abundance in response to co-treatment with sucrose and SMX, suggesting that auxin signalling mediates crosstalk between these two pathways. This study highlights an input through which metabolic status can shape plant growth and development through hormone signalling. 12 arrays total. Three arrays as non-treated control, three arrays from seedlings raised in presence of 0.2µM SMX, three arrays from seedlings raised in presence of 10mM sucrose, and three arrays from seeldings raised in presence of both 10mM sucrose and 0.2µM SMX. Three biological replicates were produced for each growth treatment.

2013-06-30 | E-GEOD-37484 | biostudies-arrayexpress

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Project description:The global sanitary crisis derived from antibiotic multi-resistant bacteria entails the need to reduce sulfamethoxazole (SMX) concentrations in wastewater treatment plants (WWTPs). The key microorganisms and the biotransformation mechanisms leading to SMX removal remain incompletely characterized, particularly under aerobic heterotrophic conditions, which are becoming increasingly relevant in the design of novel, more energy-efficient, WWTPs. In this study, sequential batch reactors were inoculated with activated sludge, operated in heterotrophic conditions and spiked with six different initial SMX concentrations ranging between 0 and 2000 µg L-1. The goal was to determine the influence of SMX in the microbiome and its enzymatic expression through genomic, metaproteomic and transformation product analyses. The results allowed us to identify the metabolite 2,4(1H,3H)-pteridinedione-SMX (PtO-SMX), pointing to the role of the pterin-conjugation pathway in the biotransformation of SMX. Additionally, at increased SMX concentrations, through metaproteomics and 16S rRNA gene sequencing, it was determined a higher abundance of the genus Corynebacterium and a differential expression of five enzymes involved in its central metabolism, suggesting the relevant role of this bacteria to mitigate SMX risks.

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Project description:Freshwater environments such as rivers receive effluent discharges from wastewater treatment plants, representing a potential hotspot for antibiotic resistance genes (ARGs). These effluents also contain low levels of different antimicrobials including biocides and antibiotics such as sulfonamides that can be frequently detected in rivers. The impact of such exposure on ARG prevalence and microbial diversity of riverine environment is unknown, so the aim of this study was to investigate the release of a sub-lethal concentration (<4 g L-1) of the sulfonamide compound sulfamethoxazole (SMX) on the river bacterial microbiome using a microflume system. This system was a semi-natural in-vitro microflume using river water (30 L) and sediment, with circulation to mimic river flow. A combination of ‘omics’ approaches were conducted to study the impact of SMX exposure on the microbiomes within the microflumes. Metaproteomics did not show differences in ARGs expression with SMX exposure in water.

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Project description:Growth of a complex multicellular organism requires coordinated changes in diverse cell types. These cellular changes generate organs of the correct size, shape and functionality. During plant development, the growth hormone auxin induces stem elongation; however, which cell types of the stem perceive the auxin signal and contribute to organ growth is poorly understood. Here, we show that auxin signalling is required in many cell types for correct hypocotyl stem growth, with a key role for the epidermis. Combining genetic manipulations in Arabidopsis thaliana with transcriptional profiling of the hypocotyl epidermis from Brassica rapa, we show that auxin functions in the epidermis in part by inducing activity of the locally-acting, growth-promoting brassinosteroid pathway. Our findings clarify cell-specific auxin function in the hypocotyl, and highlight the complexity of cell-type interactions within a growing organ. We performed whole-genome transcriptome (mRNA-Seq) on 5 d-old W light-grown Arabidopsis thaliana plants (CER6pro>>axr3-1::mCit experimental plants and UAS::axr3-1::mCit hemizygous control plants; whole-seedling tissue) treated for 4 h W light or low R:FR shade. In addition, we performed mRNA-Seq on 4 d-old Brassica rapa plants (FPsc strain) treated for 9 h W light or shade. Brassica tissues collected were hypocotyl epidermal peels or whole hypocotyls.

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