Abstract
Background
MicroRNAs (miRNAs) are about 21 snucleotide (nt) long, non-coding RNAs that play an important role in plant abiotic stress responses. Chinese jujube is a native fruit tree in China, which is also an admittedly drought-resistant plant. But the drought-related miRNAs have little been reported in jujube.
Objective
To identify possibly drought-responsive microRNAs and their target genes in Chinese Jujube.
Methods
Twelve small RNA libraries were constructed from two jujube genotypes both drought treated and control samples with three replicates to identify known and novel miRNAs in Chinese Jujube, DESeq2 was used to identify expression pattern of miRNAs between drought treatment and control samples, TargetFinder program was used to predict potential target genes of conserved and novel miRNAs, RT-qPCR were used to analysis the expression levels of drought-related miRNAs and their potential targets. The RNA ligase-mediated RLM-5′ RACE experiments were performed to validate predicted target genes of drought-related miRNAs.
Results
43 known miRNAs and 431 novel miRNAs were identified in Chinese jujube. Expression analysis showed that 28 miRNAs were differential expressed under drought stress in jujube variety “Dongzao”, including 21 up-regulated miRNAs and 7 down-regulated miRNAs, 61 miRNAs were differential expressed under drought stress in Chinese jujube variety “Zanhuangdazao”, including 23 up-regulated miRNAs and 37 down-regulated miRNAs. Depend on miRNAs target prediction, functional annotation and expression analysis, we identified 9 drought-related miRNAs, and 7 target genes of 6 miRNAs were confirmed using the modified 5′-RACE method. Also, RT-qPCR analyses revealed that relative expression of those miRNAs and their targets have negative tendency.
Conclusion
We identified 6 drought-related miRNAs by high-throughout sequencing and target gene annotation from Chinese jujube, and targets of those miRNAs were confirmed by the modified 5′-RACE method. These findings provide molecular evidence for enhancing drought tolerance in Chinese jujube and other plants.
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Acknowledgements
This work was sponsored by the Forestry and Grassland Science and Technology Innovation Project of Gansu Province (kjcx202006), National Natural Science Foundation of China (No. 31860400), and the 2021 Subsidy of Gansu Province Woody Oil Engineering Research Center.
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Conceived and designed the experiments: LZ YL JY. Performed the experiments: LZ YL JY. Analyzed the data: LZ YL JY. Contributed reagents/materials/analysis tools: HH QL JZ FW DW. Wrote the paper: LZ YL JY.
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13258_2022_1274_MOESM1_ESM.xls
Supplementary file1 Supplementary Material 1: sRNAs annotation and distribution of twelve Chinese jujube samples (XLS 27 KB)
13258_2022_1274_MOESM3_ESM.xls
Supplementary file3 Supplementary Material 3: Expression analysis of known and novel miRNAs between control and drought treatment in two Chinese jujube varieties (XLS 56 KB)
13258_2022_1274_MOESM4_ESM.docx
Supplementary file4 Supplementary Material 4: The differentially expressed miRNAs between two Chinese jujube varieties (DOCX 39 KB)
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Zhang, L., Li, Y., Yang, J. et al. Genome-wide identification of drought-responsive microRNAs and their target genes in Chinese jujube by deep sequencing. Genes Genom 45, 231–245 (2023). https://doi.org/10.1007/s13258-022-01274-5
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DOI: https://doi.org/10.1007/s13258-022-01274-5