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Thorium impact on tobacco root transcriptome
K. Mazari, P. Landa, S. Přerostová, K. Müller, R. Vaňková, P. Soudek, T. Vaněk,
Language English Country Netherlands
Document type Journal Article
- MeSH
- Cyclopentanes metabolism MeSH
- Down-Regulation MeSH
- Phosphates chemistry MeSH
- Stress, Physiological drug effects MeSH
- Cadmium metabolism MeSH
- Plant Roots metabolism MeSH
- Real-Time Polymerase Chain Reaction MeSH
- Salicylic Acid metabolism MeSH
- Plant Leaves metabolism MeSH
- Oxidative Stress MeSH
- Oxylipins metabolism MeSH
- Reactive Oxygen Species metabolism MeSH
- Gene Expression Regulation, Plant * MeSH
- Gene Expression Profiling MeSH
- Nicotiana drug effects MeSH
- Thorium pharmacology MeSH
- Transcriptome * MeSH
- Up-Regulation MeSH
- Iron chemistry MeSH
- Publication type
- Journal Article MeSH
Thorium is natural actinide metal with potential use in nuclear energetics. Contamination by thorium, originated from mining activities or spills, represents environmental risk due to its radioactivity and chemical toxicity. A promising approach for cleaning of contaminated areas is phytoremediation, which need to be based, however, on detail understanding of the thorium effects on plants. In this study we investigated transcriptomic response of tobacco roots exposed to 200μM thorium for one week. Thorium application resulted in up-regulation of 152 and down-regulation of 100 genes (p-value <0.01, fold change ≥2). The stimulated genes were involved in components of jasmonic acid and salicylic acid signaling pathways and various abiotic (e.g. oxidative stress) and biotic stress (e.g. pathogens, wounding) responsive genes. Further, up-regulation of phosphate starvation genes and down-regulation of genes involved in phytic acid biosynthesis indicated that thorium disturbed phosphate uptake or signaling. Also expression of iron responsive genes was influenced. Negative regulation of several aquaporins indicated disturbance of water homeostasis. Genes potentially involved in thorium transport could be zinc-induced facilitator ZIF2, plant cadmium resistance PCR2, and ABC transporter ABCG40. This study provides the first insight at the processes in plants exposed to thorium.
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- $a Thorium is natural actinide metal with potential use in nuclear energetics. Contamination by thorium, originated from mining activities or spills, represents environmental risk due to its radioactivity and chemical toxicity. A promising approach for cleaning of contaminated areas is phytoremediation, which need to be based, however, on detail understanding of the thorium effects on plants. In this study we investigated transcriptomic response of tobacco roots exposed to 200μM thorium for one week. Thorium application resulted in up-regulation of 152 and down-regulation of 100 genes (p-value <0.01, fold change ≥2). The stimulated genes were involved in components of jasmonic acid and salicylic acid signaling pathways and various abiotic (e.g. oxidative stress) and biotic stress (e.g. pathogens, wounding) responsive genes. Further, up-regulation of phosphate starvation genes and down-regulation of genes involved in phytic acid biosynthesis indicated that thorium disturbed phosphate uptake or signaling. Also expression of iron responsive genes was influenced. Negative regulation of several aquaporins indicated disturbance of water homeostasis. Genes potentially involved in thorium transport could be zinc-induced facilitator ZIF2, plant cadmium resistance PCR2, and ABC transporter ABCG40. This study provides the first insight at the processes in plants exposed to thorium.
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