Abstract
MicroRNAs (miRNAs) play a vital role in plant development and growth through negative regulation of post-transcriptional gene expression. Carya cathayensis (hickory) is an important species for dried nuts and oil in China, with high nutritional and economic value. The graft technique is an important strategy for hickory cultivation. To understand the role of miRNAs involved in the hickory graft process, we constructed three small ribonucleic acid (RNA) libraries from hickory rootstock (2 years old) and scion (1 year old) at 0, 7, and 14 days post-graft. Sequence analysis of the three libraries identified 21 conserved miRNAs belonging to 13 families, and 10 novel and 8 potentially novel miRNAs belonging to 15 families. Among these miRNAs, 12 miRNAs were differentially expressed during the graft process in hickory and two-thirds were downregulated. Quantitative real-time polymerase chain reaction validated that 14 miRNAs and their expression trends were similar to the results obtained by Solexa sequencing. Further, a total of 89 target genes for conserved and 26 target genes for novel miRNAs were predicted. This study will help in understanding the roles and regulatory modes of miRNAs involvement in the hickory graft process.
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Acknowledgments
This study was supported by National Natural Science Foundation of China (31070604, 31270716 and 31470683); Zhejiang Provincial Natural Science Foundation for Distinguished Young Scholar (LR13C160001); Pre-research Foundation of Center for Cultivation of Subtropical Forest Resources (CCSFR), Zhejiang A & F University; Key Project of Chinese Ministry of Education (212072); Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry ([2009]1341); National High Technology Research and Development Program of China (863 Program) (2013AA102605); initial project of Major State Basic Research Program of China (2011CB111510); Fruit Innovation Team Project of Zhejiang Province (2009R50033). We would like to thank the reviewers for their helpful comments and proposals on the manuscript.
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X. Sima, B. Jiang, J. Fang and Y. He contributed equally to this work.
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Sima, X., Jiang, B., Fang, J. et al. Identification by deep sequencing and profiling of conserved and novel hickory microRNAs involved in the graft process. Plant Biotechnol Rep 9, 115–124 (2015). https://doi.org/10.1007/s11816-015-0349-4
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DOI: https://doi.org/10.1007/s11816-015-0349-4