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Molecular characterization of proton beam-induced mutations in soybean using genotyping-by-sequencing

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Abstract

Proton beam irradiation is a next-generation technique to develop mutant crop varieties. The mutagenic effects and molecular mechanisms of radiation are important multi-disciplinary research subjects. This study was conducted to investigate the types of mutations induced in the soybean genome by proton beam irradiation. In total, 22 plants, including 10 M2 plants treated with proton beam irradiation at 118 and 239 Gy, each, and two wild-type plants (Daepung) were sequenced by genotyping-by-sequencing (GBS). In total, 7453 single nucleotide polymorphisms (SNPs) were detected in the 20 M2 plants, compared with the two wild-type controls. The SNP frequency was 1/36,976 bp with proton beam irradiation at 118 Gy, and 1/32,945 bp at 239 Gy. Of these, 3569 SNPs were detected in genic regions. We observed that proton beam irradiation induced more substitutions than small insertion–deletions (INDELs). Based on the mutagenic effect of proton beam irradiation, the frequency of transition mutations was shown to be higher than that of transversions. The proton beam-induced SNPs were distributed uniformly in most of the chromosomes. Gene ontology (GO) analysis showed that there were many genes involved in protein metabolic process under biological process, intracellular membrane-bounded organelle under cellular component, and nucleic acid binding under molecular function. This study could provide valuable information for investigating the potential mechanisms of mutation, and guidance for developing soybeans cultivars using mutation breeding.

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Acknowledgements

This work was supported by grants from the National Research Foundation of Korea (NRF) (NRF-2016M2B2A4908203 and NRF-2018M2A2A6A05057264) funded by the Korean government, and the Korea Institute of Planning and Evaluation for Technology in Food, Agriculture, Forestry, and Fisheries (IPET) through the Agri-Bio Industry Technology Development Program funded by the Ministry of Agriculture, Food and Rural Affairs, Government of the Republic of Korea (no. 315025-03-1-HD060).

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Correspondence to Bo-Keun Ha.

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The authors declare that they have no conflict of interest.

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This article does not contain any studies with human participants or animals performed by any of the authors.

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Communicated by S. Hohmann.

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Kim, W.J., Ryu, J., Im, J. et al. Molecular characterization of proton beam-induced mutations in soybean using genotyping-by-sequencing. Mol Genet Genomics 293, 1169–1180 (2018). https://doi.org/10.1007/s00438-018-1448-z

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  • DOI: https://doi.org/10.1007/s00438-018-1448-z

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