4.7 Article

Agrobacterium rhizogenes-Mediated Genetic Transformation and Establishment of CRISPR/Cas9 Genome-Editing Technology in Limonium bicolor

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AGRONOMY-BASEL
卷 13, 期 9, 页码 -

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MDPI
DOI: 10.3390/agronomy13092244

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sea lavender (Limonium bicolor); Agrobacterium rhizogenes-mediated transformation; genetic transformation; K599; CRISPR/Cas9; genome editing

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This study established a highly efficient Agrobacterium rhizogenes-mediated genetic transformation method in Limonium bicolor and successfully established a CRISPR/Cas9 system. These methods provide valuable tools for functional genomics investigation and trait improvement in Limonium bicolor.
Limonium bicolor is a perennial herbaceous plant belonging to the Plumbaginaceae family. It can be used as a dried flower or in cut flower arrangements and serves as a model recretohalophyte. Its genome sequencing has been recently completed. However, the research on L. bicolor is limited by the absence of a highly efficient genetic transformation system. In this study, we established a highly efficient Agrobacterium rhizogenes-mediated L. bicolor genetic transformation method. The transgenic hairy roots were induced from the hypocotyl of L. bicolor using A. rhizogenes strain K599 harboring pRdGa4Cas9 plasmid (which carries an expression cassette of 35S::DsRed2). The transgenic shoots were regenerated from hairy root segments (similar to 0.1 cm diameter), and induction efficiency was achieved at 100%. The transgenic shoots with 4-5 rosette leaves were directly planted into the soil to induce the transgenic roots. Therefore, transgenic plantlets were produced. The DsRed2 can be used as a reliable reporter gene in screening transgenic plantlets. Furthermore, we also established a CRISPR/Cas9 system in L. bicolor employing the A. rhizogenes-mediated genetic transformation approach. The highly efficient transformation method and CRIPSP/Cas9 system established will provide a valuable tool for functional genomics investigation and trait improvement in L. bicolor.

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