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Journal Article
Research Support, Non-U.S. Gov't
Identification and characterization of salt-responsive microRNAs in Populus tomentosa by high-throughput sequencing.
Biochimie 2013 April
Salt is one of the main environmental factors limiting plant growth and a better understanding of mechanisms of salt stress would aid efforts to bolster plant salt tolerance. MicroRNAs are well known for their important regulatory roles in response to abiotic stress in plants. In this study, high-throughput sequencing was employed to identify miRNAs in Populus tomentosa plantlets treated or not with salt (200 mM for 10 h). We found 141 conserved miRNAs belonging to 31 families, 29 non-conserved but previously-known miRNAs belonging to 26 families, and 17 novel miRNAs. Under salt stress, 19 miRNAs belonging to seven conserved miRNA families were significantly downregulated, and two miRNAs belonging to two conserved miRNA families were upregulated. Of seven non-conserved miRNAs with significantly altered expression, five were downregulated and two were upregulated. Furthermore, eight miRNAs were validated by qRT-PCR and their dynamic differential expressions were analyzed. In addition, 269 target genes of identified miRNAs were predicted and categorized by function. These results provide new insights into salt-responsive miRNAs in Populus.
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