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Functional genomics by integrated analysis of transcriptome of sweet potato (Ipomoea batatas (L.) Lam.) during root formation

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Abstract

Background

Sweet potato is easily propagated by cuttings. But the molecular biological mechanism of adventitious root formation are not yet clear.

Objective

To understand the molecular mechanisms of adventitious root formation from stem cuttings in sweet potato.

Methods

RNA-seq analysis was performed using un-rooted stem (0 day) and rooted stem (3 days). Gene Ontology (GO) enrichment analysis, Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway, comparison with Arabidopsis transcription factors (TFs) of DEGs were conducted to investigate the characteristics of genes and TFs involved in root formation. In addition, qRT-PCR analysis using roots at 0, 3, 6, 9, and 12 days after planting was performed to confirm RNA-seq reliability and related genes expression.

Results

42,459 representative transcripts and 2092 DEGs were obtained through the RNA-seq analysis. The DEGs indicated the GO terms related to the single-organism metabolic process and cell periphery, and involved in the biosynthesis of secondary metabolites, and phenylpropanoid biosynthesis in KEGG pathways. The comparison with Arabidopsis thaliana TF database showed that 3 TFs (WRKY, NAC, bHLH) involved in root formation of sweet potato. qRT-PCR analysis, which was conducted to confirm the reliability of RNA-seq analysis, indicated that some metabolisms including oxidative stress and wounding, transport, hormone may be involved in adventitious root formation.

Conclusions

The detected genes related to secondary metabolism, some hormone (auxin, gibberellin), transports, etc. and 3 TFs (WRKY, NAC, bHLH) may have functions in adventitious roots formation. This results provide valuable resources for future research on the adventitious root formation of sweet potato.

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Acknowledgements

This work was supported by the 2016 Research Fund of University of Seoul.

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  1. Sujung Kim and Hualin Nie contributed equally to this work.

Authors and Affiliations

  1. Department of Environmental Horticulture, University of Seoul, Seoul, 02504, Korea

    Sujung Kim, Hualin Nie, Byungki Jun, Jiseong Kim, Jeongeun Lee, Seungill Kim & Sunhyung Kim

  2. NH Seed Research Development Center, Nonghyup Agribusiness Group Incorporation, Anseong, 17558, Korea

    Byungki Jun

  3. College of Pharmacy, Catholic University of Daegu, Gyeongsan, Gyeongbuk, 38430, Korea

    Ekyune Kim

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Kim, S., Nie, H., Jun, B. et al. Functional genomics by integrated analysis of transcriptome of sweet potato (Ipomoea batatas (L.) Lam.) during root formation. Genes Genom 42, 581–596 (2020). https://doi.org/10.1007/s13258-020-00927-7

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