Abstract
Although transient gene expression using reporters such as green fluorescent protein is a versatile tool for examining gene functions and intracellular protein trafficking, the establishment of a highly efficient gene manipulation method remains a challenge in many plant species. A reliable transformation protocol has not yet been established for the three single-cell C4 species, despite their potential of serving as model systems for their extraordinary C4 photosynthetic metabolism. We report the first protocol optimized for isolating a large-scale and homogenous population of protoplasts from chlorenchyma cells of the single-cell C4 species Bienertia sinuspersici. Cytochemical staining confirmed the preservation of the unusual subcellular compartmentation of organelles in chlorenchyma cells after cell wall digestion. Approximately 84% of isolated protoplasts expressed the reporter fluorescent protein following our optimized polyethylene glycol-mediated transfection procedures. Fluorescent fusion protein tagged with various intracellular sorting signals demonstrated potential use of the transient gene expression system in subcellular protein localization and organelle dynamics studies. Further applications of the current protoplast isolation and transfection techniques in understanding the novel single-cell C4 photosynthetic mechanism are discussed.
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Acknowledgments
This research was supported by the Natural Sciences and Engineering Research Council (NSERC) of Canada Research Grants and the University of Waterloo Start-Up Fund to SDXC. SCL received additional financial support from Ontario Graduate Scholarship (Government of Ontario, Canada) and President’s Graduate Scholarship (University of Waterloo, Canada). The authors gratefully acknowledge the following colleagues for providing GFP constructs: pSAT6-35S::EGFP-N1 and pSAT6-35S::EGFP-C1 (Tzvi Tzfira, University of Michigan), talin-GFP (Nam-Hai Chua, The Rockefeller University), and MAP4-GFP (Richard Cyr, Pennsylvania State University).
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Communicated by F. Brandizzi.
S.-C. Lung and M. Yanagisawa contributed equally to this work.
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Lung, SC., Yanagisawa, M. & Chuong, S.D.X. Protoplast isolation and transient gene expression in the single-cell C4 species, Bienertia sinuspersici . Plant Cell Rep 30, 473–484 (2011). https://doi.org/10.1007/s00299-010-0953-2
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DOI: https://doi.org/10.1007/s00299-010-0953-2