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Protoplasts are commonly used in genetic and breeding research. In this study, the isolation of sorghum protoplasts was optimized and applied to transient gene expression and editing by CRISPR/Cas9. The protoplast was most viable in 0.5 M mannitol, which was the highest of three concentrations after 48- and 72-hours treatments. Using this method we can derive an average of 1.6×10 6  cells which vary from 5 to 22 nm in size. The average transfection of the protoplasts was 68.5% using the PEG-mediated method. The subcellular assays located Sobic.002G279100-GFP and GFP proteins in the cell compartments as predicted bioinformatically. Two CRISPR/Cas9 plasmids were transfected into sorghum protoplasts to screen for an appropriate sgRNA for gene editing. One plasmid can correctly edit the target region using a single protoplast cell as template DNA. Our results indicated that the protoplast assays as optimized are suitable for transient gene expression and sgRNA screening in CRISPR/Cas9 gene editing procedures.

An efficient sorghum protoplast assay for transient gene expression and gene editing by CRISPR/Cas9