Abstract
Background
Wood (secondary xylem) of forests is a material of great economic importance. Wood development is strictly controlled by both the phytohormone auxin and microRNAs (miRNAs). Currently, the regulatory mechanisms underlying wood formation by auxin-associated miRNAs remain unclear.
Objective
This report was designed to identify auxin-responsive miRNAs during wood formation.
Methods
Morphological observation of wood development in the poplar stems was performed under the treatment of different concentrations (0 mg/L, CK; 5 mg/L, Low; 10 mg/L, High) of indol-3-butyric acid (IBA). Using a small RNA sequencing strategy, the effect of IBA treatment on miRNAs expression was genome-widely analyzed.
Results
In this study, we found that wood development of poplar was promoted by low concentration of IBA treatment but inhibited by high concentration of IBA treatment. Stringent bioinformatic analysis led to identification of 118 known and 134 novel miRNAs candidates. Sixty-nine unique developmental-related miRNAs, corresponding to 269 target genes, exhibited specific expression patterns in response to auxin, as was consistent with the influence of auxin application on wood formation. Three novel miRNAs had the most number (≥ 9) of target genes, belonging to SPL, GRF and ARF gene families. The evolutionary relationships and tissue expression patterns of 41 SPL, GRF and ARF genes in poplar were thus analyzed. Of them, four representative members and corresponding miRNAs were confirmed using RT-qPCR.
Conclusions
Our results may be helpful for a better understanding of auxin-induced regulation of wood formation in tree species.
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Data archiving statement
The small RNA raw data are available at the Sequence Read Archive under PRJNA850678. Data openly available in a public repository.
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Acknowledgements
This research was financially supported by National Natural Science Foundation of China (32201585 and 32101549), Natural Science Foundation of Shandong Province (ZR2022QC055), Science & Technology Specific Projects in Agricultural High-tech Industrial Demonstration Area of the Yellow River Delta (2022SZX39) and Taishan Scholar Program of Shandong (tsqn202103092).
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LY, WL and SS conducted the experiments. TP, JW and QW contributed the bioinformatic analyses. GC designed the study. YC and YB drafted the manuscript. All authors critically revised the manuscript and approved the final version.
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13258_2023_1385_MOESM1_ESM.png
Supplementary file1 Supplemental Fig. 1 Phenotype of one-month-old poplar seedlings grown in 1/2 MS with different concentrations of IBA treatment. (PNG 1361 KB)
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Yang, L., Ping, T., Lu, W. et al. Genome-wide identification of auxin-responsive microRNAs in the poplar stem. Genes Genom 45, 1073–1083 (2023). https://doi.org/10.1007/s13258-023-01385-7
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DOI: https://doi.org/10.1007/s13258-023-01385-7