Abstract
MicroRNAs (miRNAs) play crucial roles in all aspects of plant growth and development, but the genetic interactions of miRNAs and their target genes in woody plants are largely unknown. Here, we integrated association genetics and expression profiling to decipher the allelic variations and interactions of the Pto-MIR319 family of miRNAs and 12 putative Pto-miR319 target genes related to wood formation in 435 unrelated individuals of Populus tomentosa Carrière (Chinese white poplar). Expression pattern analysis showed that among all pairings between expressions of pre-miRNA of Pto-MIR319 members and targets, 70.0% showed negative correlation of expression levels (r = – 0.944 to 0.674, P < 0.01) in eight tissues and organs of poplar, suggesting that Pto-miR319 may participate in the regulatory network of wood formation. Single SNP-based association studies identified 137 significant associations (P < 0.01, Q < 0.1), representing 126 unique SNPs from Pto-MIR319 members and their targets, with 10 tree growth traits, revealing that these genetic factors have common roles related to wood formation. Epistasis analysis uncovered 105 significant SNP–SNP associations (P < 0.01) influencing the 10 traits, demonstrating the close genetic interactions between Pto-MIR319 family members and the 12 Pto-miR319 target genes. Notably, one common SNP, in the precursor region of Pto-MIR319e, affected the stability of Pto-MIR319e’s secondary structure by altering the stem-loop structure and minimum free energy, contributing to variations in the expression of Pto-MIR319e and Pto-miR319e target genes. This study enriches the understanding of the functions of miR319 family miRNAs in poplar and exemplifies a feasible approach to exploring the genetic effects underlying miRNA–mRNA interactions related to complex traits in trees.
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Data availability
Sequence data in this article have been deposited with the NCBI GenBank Data Library under the accession codes listed in Table S2, and the degradome sequencing data are available in the Genome Sequence Archive of the BIG Data Center, Beijing Institute of Genomics, Chinese Academy of Science, under the accession code CRA000989.
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Acknowledgements
This work was supported by the Projects of the National Natural Science Foundation of China (Nos. 31670333 and 31401138) and the China Postdoctoral Science Foundation (Nos. 2018M640084 and 2019T120058).
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DZ designed the research; JS, MQ, and LX performed the experiments; JX and QD collected and analyzed the data; JS and MQ wrote the manuscript; DZ obtained funding and is responsible for this article. All the authors read and approved the manuscript.
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Figure S2. Transcript abundances of Pto-MIR319e and its five target genes under different genotypes of Pto-MIR319e_SNP5. Error bars indicate the SE of biological replicates
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Table S6. The common single-nucleotide polymorphisms (SNPs; minor allele frequency ≥ 5%) in Pto-MIR319a–h and their 12 target genes
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Table S7. Detail of significant SNPs within the Pto-MIR319 family and their targets associated with tree growth and wood formation in a natural population of P. tomentosa.
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Table S8. Significant haplotypes from Pto-MIR319 family members and the target genes associated with growth and wood properties in the P. tomentosa association population.
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Table S9. The SNP pairs and their main effects detected from Pto-MIR319 family members and the 12 targets under the epistasis model in the P. tomentosa association population.
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Si, J., Quan, M., Xiao, L. et al. Genetic interactions among Pto-miR319 family members and their targets influence growth and wood properties in Populus tomentosa. Mol Genet Genomics 295, 855–870 (2020). https://doi.org/10.1007/s00438-020-01667-9
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DOI: https://doi.org/10.1007/s00438-020-01667-9