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Chromosome doubling methods in doubled haploid and haploid inducer-mediated genome-editing systems in major crops

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Abstract

The doubled haploid technique aims to generate pure inbred lines for basic research and as commercial cultivars. The doubled haploid technique first generates haploid plants and is followed by chromosome doubling, which can be separated in time or overlapped, depending the procedure for each species. For a long time, much effort has been focused on haploid production via androgenesis, gynogenesis, or parthenogenesis. The obtention of haploid plants has frequently required more optimization and has lagged behind research and improvements in chromosome doubling methods. Nevertheless, chromosome doubling has recently been of renewed interest to increase the rates and efficiency of doubled haploid plant production through trialing and optimizing of different procedures. New antimitotic compounds and application methods are being studied to ensure the success of chromosome doubling once haploid material has been regenerated. Moreover, a haploid inducer-mediated CRISPR/Cas9 genome-editing system is a breakthrough method in the production of haploid plant material and could be of great importance for species where traditional haploid regeneration methods have not been successful, or for recalcitrant species. In all cases, the new deployment of this system will demand a suitable chromosome doubling protocol. In this review, we explore the existing doubled haploid and chromosome doubling methods to identify opportunities to enhance the breeding process in major crops.

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Acknowledgements

This project has received funding from the European Union's Horizon 2020 Research and Innovation Programme under grant agreement No 678168, and from the Departament d'Innovació, Universitats i Empresa, Generalitat de Catalunya (2017 DI 001). The authors would like to acknowledge the comments, revisions, and recommendations made by J. Trescasas-Levy. The revisions made by C. López-Cristoffanini and R. Vidal-Illa are also acknowledged.

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In this article, IH proposed the idea and wrote the manuscript. SN revised the article.

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Correspondence to Isidre Hooghvorst.

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IH and SN declare no conflict of interest.

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Communicated by Wusheng Liu.

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Hooghvorst, I., Nogués, S. Chromosome doubling methods in doubled haploid and haploid inducer-mediated genome-editing systems in major crops. Plant Cell Rep 40, 255–270 (2021). https://doi.org/10.1007/s00299-020-02605-0

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  • DOI: https://doi.org/10.1007/s00299-020-02605-0

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