Abstract
MicroRNAs (miRNA) are a class of non-coding RNAs that have important gene regulatory roles in various organisms. However, the miRNAs involved in soybean’s response to soybean mosaic virus (SMV) are unknown. To identify novel miRNAs and biotic-stress regulated small RNAs that are involved in soybean’s response to SMV, two small RNA libraries were constructed from mock-inoculated and SMV-infected soybean leaves and sequenced. This led to the discovery of 179 miRNAs, representing 52 families, among which five miRNAs belonging to three families were novel miRNAs in soybean. A large proportion (71.5 %) of miRNAs arose from segmental duplication, similar to the process that drives the evolution of protein-coding genes. In addition, we predicted 346 potential targets of these identified miRNAs, and verified 12 targets by modified 5′-RACE analysis. Finally, three miRNAs (miR160, miR393 and miR1510) that are involved in plant resistance were observed to respond to SMV infection. The interaction between miRNAs and resistance-related genes provides a novel mechanism for pathogens to evade host recognition.
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Abbreviations
- AFB:
-
Auxin signaling F-box protein
- ARF:
-
Auxin response factor
- CC:
-
Coiled-coil domain
- DCL:
-
Dicer-like
- LRR:
-
Leucine-rich repeat
- MFE:
-
Minimum free energy
- miRNA:
-
MicroRNA
- NB:
-
Nucleotide binding domain
- RISC:
-
RNA induced silencing complex
- SMV:
-
Soybean mosaic virus
- ssRNAs:
-
Single-stranded RNAs
- TIR1:
-
Transport inhibitor response 1
- TIR-NBS-LRR:
-
Toll/interleukin-1 receptor-nucleotide binding site-leucine-rich repeat
- TPM:
-
Transcripts per million
- TuMV:
-
Turnip mosaic virus
- WGD:
-
Whole-genome duplication
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Acknowledgments
We thank Dr. Sihai Yang of Nanjing University for his critical reading of the manuscript. This work was supported in part by the National Basic Research Program of China (973 Program) (2010CB125906, 2009CB118400), the National Natural Science Foundation of China (31000718, 31171573, 31201230), and Jiangsu Provincial Support Program (BE2012328, BK2012768).
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X. Yin and J. Wang contributed equally to this paper.
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Table S1 Statistics of small RNAs sequenced from soybean; Fig. S1 Size distribution of soybean small RNAs in mock (a) and SMV (b) libraries; Fig. S2 Percentages of sequencing results for three miRNA groups based on comparison between sequences of Nannong 1138-2 and those of Williams 82; Fig. S3 Expression analysis of miRNAs by stem-loop qRT-PCR treated by SMV (DOC 213 kb)
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Yin, X., Wang, J., Cheng, H. et al. Detection and evolutionary analysis of soybean miRNAs responsive to soybean mosaic virus. Planta 237, 1213–1225 (2013). https://doi.org/10.1007/s00425-012-1835-3
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DOI: https://doi.org/10.1007/s00425-012-1835-3