Abstract
Plant response to stress has been linked to different RNA-silencing processes and epigenetic mechanisms. Our recent results showed that Arabidopsis thaliana Dicer-like (DCL) mutants were impaired in transgenerational changes, recombination frequency and stress tolerance. We also found that transgenerational changes were dependent on changes in DNA methylation. Here, we hypothesized that plants deficient in the production of small RNAs would show an impaired abiotic stress response. To test this, we exposed A. thaliana dcl2, dcl3, dcl4, dcl2 dcl3 (d2d3), dcl2 dcl4 (d2d4), dcl2 dcl3 dcl4 (d2d3d4), nrpd1a, rdr2 and rdr6 mutants to methyl methane sulfonate (MMS). We found dcl4 and rdr6 to be more sensitive and dcl2, dcl3, d2d3 and rdr2 plants more resistant to MMS, as shown by fresh weight, root length and survival rate. The in vitro repair assay showed the lower ability of dcl2 and dcl3 to repair UV-damaged DNA. To summarize, we found that whereas mutants impaired in transactivating siRNA biogenesis were more sensitive to MMS, mutants impaired in natural antisense siRNA and heterochromatic siRNA biogeneses were more tolerant. Our data suggest that plant response to MMS is in part regulated through biogenesis of various siRNAs.
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Abbreviations
- N7-MeG:
-
7-Methylguanine
- ABA:
-
Abscisic acid
- BER:
-
Base excision repair
- DCL:
-
Dicer-like
- DSBs:
-
Double-strand DNA breaks
- HR:
-
Homologous recombination
- MMS:
-
Methyl methane sulfonate
- miRNA:
-
MicroRNA
- MMR:
-
Mismatch repair
- nat-siRNAs:
-
Natural antisense siRNAs
- NHEJ:
-
Non-homologous end-joining
- siRNAs:
-
Small interfering RNAs
- ta-siRNAs:
-
Transactivating siRNAs
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Acknowledgments
We would like to thank Valentina Titova and Zoe Migicovsky for proofreading the manuscript. The authors acknowledge NSERC Discovery and HFSP grant to IK.
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Communicated by E. Guiderdoni.
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Yao, Y., Bilichak, A., Golubov, A. et al. Differential sensitivity of Arabidopsis siRNA biogenesis mutants to genotoxic stress. Plant Cell Rep 29, 1401–1410 (2010). https://doi.org/10.1007/s00299-010-0930-9
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DOI: https://doi.org/10.1007/s00299-010-0930-9