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A simple and efficient agroinfiltration method for transient gene expression in Citrus

Abstract

Key message

Microwounding pre-treatment facilitates agroinfiltration and transient gene expression in hard-to-agroinfiltrate citrus varieties.

Abstract

Agrobacterium infiltration is a widely used method for transient expression studies in plants, but this method is not used extensively in citrus because of its low efficiency. In this study, we developed an easy, cheap, and reliable agroinfiltration method for transient gene expression in citrus. A microneedle roller was used to create microscopic wounds in the leaf epidermis to facilitate agroinfiltration. Several optimization parameters were explored in this study, including the density of wounds per cm2 of abaxial leaf area, the leaf maturity grade, the effect of the Agrobacterium strain, and the length of the incubation period. Increasing the density of wounds on the leaf surface had a positive effect on transient expression. Higher transient expression levels were observed in well-expanded young leaves in comparison with older leaves. The Agrobacterium strain GV2260 was the most suitable to express a large amount of recombinant protein, and an eight- to ten-day incubation period resulted in the highest expression. Endoplasmic reticulum and cytoskeleton-targeted GFP were both successfully localized, confirming that this protocol can be used for protein subcellular localization in citrus. Finally, up to 100 ng of GFP per milligram of agroinfiltrated leaf tissue was estimated to be expressed using this method. This protocol was tested for GFP expression in five different citrus varieties with no significant statistical differences among them. This simple and easy method can speed up functional genomic studies in citrus and may be applied to other recalcitrant species with extensive epidermal cuticular wax.

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Acknowledgements

The authors are grateful to Dr. Fernanda Nogales for her contributions in the conception of the original idea of this paper. This research was funded by the National Institute of Food and Agriculture, Grant numbers 2018-70016-27392 and 2019-70016-29096 to AL.

Funding

National Institute of Food and Agriculture, Grant numbers 2018-70016-27392 and 2019-70016-29096.

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YA and AL conceived and designed research. YA conducted experiments. SW and VO contributed new reagents or analytical tools. YA and SW analyzed data. YA and AL wrote the manuscript. All authors read and approved the manuscript.

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Correspondence to Amit Levy.

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Communicated by Leandro Peña.

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Acanda, Y., Welker, S., Orbović, V. et al. A simple and efficient agroinfiltration method for transient gene expression in Citrus. Plant Cell Rep 40, 1171–1179 (2021). https://doi.org/10.1007/s00299-021-02700-w

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Keywords

  • Citrus agroinfiltration
  • Microneedle roller
  • Transient gene expression