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Korean Society for Biochemistry and Molecular Biology (생화학분자생물학회)
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Phenotypic characterization of pre-harvest sprouting resistance mutants generated by the CRISPR/Cas9-geminiviral replicon system in rice

  • Jong Hee Kim (Division of Horticultural Biotechnology, School of Biotechnology, Hankyong National University) ;
  • Jihyeon Yu (Department of Biochemistry and Molecular Biology, Seoul National University College of Medicine) ;
  • Jin Young Kim (Division of Horticultural Biotechnology, School of Biotechnology, Hankyong National University) ;
  • Yong Jin Park (Department of Plant Resources, College of Industrial Sciences, Kongju National University) ;
  • Sangsu Bae (Department of Biochemistry and Molecular Biology, Seoul National University College of Medicine) ;
  • Kwon Kyoo Kang (Division of Horticultural Biotechnology, School of Biotechnology, Hankyong National University) ;
  • Yu Jin Jung (Division of Horticultural Biotechnology, School of Biotechnology, Hankyong National University)
  • Received : 2023.10.19
  • Accepted : 2023.12.03
  • Published : 2024.02.29
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Abstract

Pre-harvest sprouting is a critical phenomenon involving germination of seeds in the mother plant before harvest under relative humid conditions and reduced dormancy. In this paper, we generated HDR mutant lines with one region SNP (C/T) and an insertion of 6 bp (GGT/GGTGGCGGC) in OsERF1 genes for pre-harvest sprouting (PHS) resistance using CRISPR/Cas9 and a geminiviral replicon system. The incidence of HDR was 2.6% in transformed calli. T1 seeds were harvested from 12 HDR-induced calli and named ERF1-hdr line. Molecular stability, key agronomic properties, physiological properties, and biochemical properties of target genes in the ERF1-hdr line were investigated for three years. The ERF1-hdr line showed significantly enhanced seed dormancy and pre-harvest sprouting resistance. qRT-PCR analysis suggested that enhanced ABA signaling resulted in a stronger phenotype of PHS resistance. These results indicate that efficient HDR can be achieved through SNP/InDel replacement using a single and modular configuration applicable to different rice targets and other crops. This work demonstrates the potential to replace all genes with elite alleles within one generation and greatly expands our ability to improve agriculturally important traits.

Keywords

Acknowledgement

This work was supported by a grant from the New Breeding Technologies Development Program (Project No. RS-2022-RD010342). Rural Development Administration and basic science research program through the National Research Foundation of Korea (NRF) funded by the ministry education (2022R1A2C1092904) Republic of Korea.

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