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Dolata J, Bajczyk M, Bielewicz D, Niedojadlo K, Niedojadlo J, Pietrykowska H, Walczak W, Szweykowska-Kulinska Z, Jarmolowski A. Salt Stress Reveals a New Role for ARGONAUTE1 in miRNA Biogenesis at the Transcriptional and Posttranscriptional Levels. Plant Physiol 2016; 172:297-312. [PMID: 27385819 PMCID: PMC5074614 DOI: 10.1104/pp.16.00830] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2016] [Accepted: 07/02/2016] [Indexed: 05/03/2023]
Abstract
Plants as sessile organisms have developed prompt response mechanisms to react to rapid environmental changes. In addition to the transcriptional regulation of gene expression, microRNAs (miRNAs) are key posttranscriptional regulators of the plant stress response. We show here that the expression levels of many miRNAs were regulated under salt stress conditions. This regulation occurred at the transcriptional and posttranscriptional levels. During salinity stress, the levels of miRNA161 and miRNA173 increased, while the expression of pri-miRNA161 and pri-miRNA173 was down-regulated. Under salt stress conditions, miRNA161 and miRNA173 were stabilized in the cytoplasm, and the expressions of MIR161 and MIR173 were negatively regulated in the nucleus. ARGONAUTE1 (AGO1) participated in both processes. We demonstrated that AGO1 cotranscriptionally controlled the expression of MIR161 and MIR173 in the nucleus. Our results suggests that AGO1 interacts with chromatin at MIR161 and MIR173 loci and causes the disassembly of the transcriptional complex, releasing short and unpolyadenylated transcripts.
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Affiliation(s)
- Jakub Dolata
- Department of Gene Expression, Faculty of Biology, Institute of Molecular Biology and Biotechnology, Adam Mickiewicz University, 61-614 Poznan, Poland (J.D., M.B., D.B., H.P., W.W., Z.S.-K., A.J.); andDepartment of Cell Biology, Faculty of Biology and Environment Protection, Nicolaus Copernicus University, 87-100 Torun, Poland (K.N., J.N.)
| | - Mateusz Bajczyk
- Department of Gene Expression, Faculty of Biology, Institute of Molecular Biology and Biotechnology, Adam Mickiewicz University, 61-614 Poznan, Poland (J.D., M.B., D.B., H.P., W.W., Z.S.-K., A.J.); andDepartment of Cell Biology, Faculty of Biology and Environment Protection, Nicolaus Copernicus University, 87-100 Torun, Poland (K.N., J.N.)
| | - Dawid Bielewicz
- Department of Gene Expression, Faculty of Biology, Institute of Molecular Biology and Biotechnology, Adam Mickiewicz University, 61-614 Poznan, Poland (J.D., M.B., D.B., H.P., W.W., Z.S.-K., A.J.); andDepartment of Cell Biology, Faculty of Biology and Environment Protection, Nicolaus Copernicus University, 87-100 Torun, Poland (K.N., J.N.)
| | - Katarzyna Niedojadlo
- Department of Gene Expression, Faculty of Biology, Institute of Molecular Biology and Biotechnology, Adam Mickiewicz University, 61-614 Poznan, Poland (J.D., M.B., D.B., H.P., W.W., Z.S.-K., A.J.); andDepartment of Cell Biology, Faculty of Biology and Environment Protection, Nicolaus Copernicus University, 87-100 Torun, Poland (K.N., J.N.)
| | - Janusz Niedojadlo
- Department of Gene Expression, Faculty of Biology, Institute of Molecular Biology and Biotechnology, Adam Mickiewicz University, 61-614 Poznan, Poland (J.D., M.B., D.B., H.P., W.W., Z.S.-K., A.J.); andDepartment of Cell Biology, Faculty of Biology and Environment Protection, Nicolaus Copernicus University, 87-100 Torun, Poland (K.N., J.N.)
| | - Halina Pietrykowska
- Department of Gene Expression, Faculty of Biology, Institute of Molecular Biology and Biotechnology, Adam Mickiewicz University, 61-614 Poznan, Poland (J.D., M.B., D.B., H.P., W.W., Z.S.-K., A.J.); andDepartment of Cell Biology, Faculty of Biology and Environment Protection, Nicolaus Copernicus University, 87-100 Torun, Poland (K.N., J.N.)
| | - Weronika Walczak
- Department of Gene Expression, Faculty of Biology, Institute of Molecular Biology and Biotechnology, Adam Mickiewicz University, 61-614 Poznan, Poland (J.D., M.B., D.B., H.P., W.W., Z.S.-K., A.J.); andDepartment of Cell Biology, Faculty of Biology and Environment Protection, Nicolaus Copernicus University, 87-100 Torun, Poland (K.N., J.N.)
| | - Zofia Szweykowska-Kulinska
- Department of Gene Expression, Faculty of Biology, Institute of Molecular Biology and Biotechnology, Adam Mickiewicz University, 61-614 Poznan, Poland (J.D., M.B., D.B., H.P., W.W., Z.S.-K., A.J.); andDepartment of Cell Biology, Faculty of Biology and Environment Protection, Nicolaus Copernicus University, 87-100 Torun, Poland (K.N., J.N.)
| | - Artur Jarmolowski
- Department of Gene Expression, Faculty of Biology, Institute of Molecular Biology and Biotechnology, Adam Mickiewicz University, 61-614 Poznan, Poland (J.D., M.B., D.B., H.P., W.W., Z.S.-K., A.J.); andDepartment of Cell Biology, Faculty of Biology and Environment Protection, Nicolaus Copernicus University, 87-100 Torun, Poland (K.N., J.N.)
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Hrynkiewicz K, Dabrowska G, Baum C, Niedojadlo K, Leinweber P. Interactive and Single Effects of Ectomycorrhiza Formation and Bacillus cereus on Metallothionein MT1 Expression and Phytoextraction of Cd and Zn by Willows. Water Air Soil Pollut 2012; 223:957-968. [PMID: 22389535 PMCID: PMC3283765 DOI: 10.1007/s11270-011-0915-5] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2011] [Accepted: 08/03/2011] [Indexed: 05/24/2023]
Abstract
Single and joint ectomycorrhizal (+ Hebeloma mesophaeum) and bacterial (+ Bacillus cereus) inoculations of willows (Salix viminalis) were investigated for their potential and mode of action in the promotion of cadmium (Cd) and zinc (Zn) phytoextraction. Dual fungal and bacterial inoculations promoted the biomass production of willows in contaminated soil. Single inoculations either had no effect on the plant growth or inhibited it. All inoculated willows showed increased concentrations of nutritional elements (N, P, K and Zn) and decreased concentrations of Cd in the shoots. The lowest biomass production and concentration of Cd in the willows (+ B. cereus) were combined with the strongest expression of metallothioneins. It seems that biotic stress from bacterial invasion increased the synthesis of these stress proteins, which responded in decreased Cd concentrations. Contents of Cd and Zn in the stems of willows were combination-specific, but were always increased in dual inoculated plants. In conclusion, single inoculations with former mycorrhiza-associated B. cereus strains decreased the phytoextraction efficiency of willows by causing biotic stress. However, their joint inoculation with an ectomycorrhizal fungus is a very promising method for promoting the phytoextraction of Cd and Zn through combined physiological effects on the plant.
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Affiliation(s)
- Katarzyna Hrynkiewicz
- Soil Science, University of Rostock, Justus-von-Liebig-Weg 6, 18059 Rostock, Germany
- Department of Microbiology, Institute of General and Molecular Biology, N. Copernicus University of Torun, Torun, Poland
| | - Grazyna Dabrowska
- Department of Genetics, Institute of General and Molecular Biology, N. Copernicus University of Torun, Torun, Poland
| | - Christel Baum
- Soil Science, University of Rostock, Justus-von-Liebig-Weg 6, 18059 Rostock, Germany
| | - Katarzyna Niedojadlo
- Department of Cell Biology, Institute of General and Molecular Biology, N. Copernicus University of Torun, Torun, Poland
| | - Peter Leinweber
- Soil Science, University of Rostock, Justus-von-Liebig-Weg 6, 18059 Rostock, Germany
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