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This is accepted manuscript by the journal but prior to copy-editing or proofing. It can be cited using the author(s), article title, journal title, year of online publication, and DOI. It will be replaced by the final typeset version, which may therefore contain changes. The DOI will be remain the same.

PERSPECTIVE   Open Access    

Towards transforming cassava breeding: harnessing inbred-parent-based hybrid breeding strategies

  • 1.

    Cassava Program, International Center for Tropical Agriculture (CIAT), Cali, Colombia

  • 2.

    Current address: Department of Plant Sciences, University of California, Davis

  • 3.

    Accelerated Breeding Initiative, CGIAR

  • 4.

    National Root Crops Research Institute (NRCRI), Umudike, Nigeria

  • 5.

    International Institute of Tropical Agriculture (IITA), Ibadan, Nigeria

  • 6.

    Department of Global Development and School of Integrative Plant Science Plant Breeding and Genetics Section, Cornell University

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  • Genomics-assisted breeding has significantly improved recurrent selection in cassava. However, challenges persist with the use of heterozygous parents, hindering efficient trait introgression to meet the needs of ever-changing markets and environmental conditions. To address this, we propose an innovative approach – inbred-parent-based hybrid cassava breeding, aiming to transform cassava breeding by implementing backcrossing-based trait introgression, effectively purging deleterious mutations, and systematically exploring and utilizing heterosis. This perspective paper discusses the key drawbacks of heterozygous parent-based recurrent selection and outlines how the proposed approach overcomes these challenges. By leveraging the self-compatibility of cassava and advanced technologies like flower-inducing and doubled haploid technologies, along with genomics advancements and a global network, cassava breeding programs can achieve efficient, cost-effective, and accelerated inbred-parent-based hybrid breeding. In conclusion, we emphasize four crucial action areas to focus on for the initial phase to realize this transformation, i.e., understanding inbreeding depression, developing inbred or doubled haploid parents, purging genetic load, and identifying or creating heterotic pools. Through collective efforts and global collaboration, inbred-parent-based hybrid cassava breeding will transform cassava breeding and production, ensuring resilience and adaptability to significantly contribute to ending hunger and reducing poverty during the climate crisis.

  • Cite this article

    Zhang X, Holley R, Egesi CN, Gemenet DC, Moreta D, et al. 2024. Towards transforming cassava breeding: harnessing inbred-parent-based hybrid breeding strategies. Tropical Plants doi: 10.48130/tp-0024-0024
    Zhang X, Holley R, Egesi CN, Gemenet DC, Moreta D, et al. 2024. Towards transforming cassava breeding: harnessing inbred-parent-based hybrid breeding strategies. Tropical Plants doi: 10.48130/tp-0024-0024
    shu

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Important Notice

This is accepted manuscript by the journal but prior to copy-editing or proofing. It can be cited using the author(s), article title, journal title, year of online publication, and DOI. It will be replaced by the final typeset version, which may therefore contain changes. The DOI will be remain the same.

PERSPECTIVE   Open Access    

Towards transforming cassava breeding: harnessing inbred-parent-based hybrid breeding strategies

  • 1.

    Cassava Program, International Center for Tropical Agriculture (CIAT), Cali, Colombia

  • 2.

    Current address: Department of Plant Sciences, University of California, Davis

  • 3.

    Accelerated Breeding Initiative, CGIAR

  • 4.

    National Root Crops Research Institute (NRCRI), Umudike, Nigeria

  • 5.

    International Institute of Tropical Agriculture (IITA), Ibadan, Nigeria

  • 6.

    Department of Global Development and School of Integrative Plant Science Plant Breeding and Genetics Section, Cornell University

  • Received Date: 27 February 2024
  • Accepted Date: 08 May 2024
    • First-online Date: 22 May 2024
Tropical Plants  Article in press  (2024)  |  Cite this article

Abstract: Genomics-assisted breeding has significantly improved recurrent selection in cassava. However, challenges persist with the use of heterozygous parents, hindering efficient trait introgression to meet the needs of ever-changing markets and environmental conditions. To address this, we propose an innovative approach – inbred-parent-based hybrid cassava breeding, aiming to transform cassava breeding by implementing backcrossing-based trait introgression, effectively purging deleterious mutations, and systematically exploring and utilizing heterosis. This perspective paper discusses the key drawbacks of heterozygous parent-based recurrent selection and outlines how the proposed approach overcomes these challenges. By leveraging the self-compatibility of cassava and advanced technologies like flower-inducing and doubled haploid technologies, along with genomics advancements and a global network, cassava breeding programs can achieve efficient, cost-effective, and accelerated inbred-parent-based hybrid breeding. In conclusion, we emphasize four crucial action areas to focus on for the initial phase to realize this transformation, i.e., understanding inbreeding depression, developing inbred or doubled haploid parents, purging genetic load, and identifying or creating heterotic pools. Through collective efforts and global collaboration, inbred-parent-based hybrid cassava breeding will transform cassava breeding and production, ensuring resilience and adaptability to significantly contribute to ending hunger and reducing poverty during the climate crisis.

    Acknowledgments

    • This research was supported by the "Next Generation Cassava Breeding Project," OPP1175661, funded by the Bill & Melinda Gates Foundation and the Department for International Development of the United Kingdom Agreement, and "Genetic Improvement in Cassava" funded by the United States Agency for International Development (USAID). We would like to thank Dr. Hernan Ceballos, Dr. Clair Hershey, Dr. Carlos Iglesias, Dr. Giovanny Covarrubias Pazaran, and Dr. Marlee R. Labroo for their valuable insights on various aspects of the manuscript. We also want to thank the reviewers for their constructive suggestions and corrections, and we acknowledge the active role of the editor during the revision of our manuscript.

    Conflict of interest

    • The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest. Xiaofei Zhang is the Editorial Board member of Tropical Plants who was blinded from reviewing or making decisions on the manuscript. The article was subject to the journal's standard procedures, with peer-review handled independently of the Editorial Board member and the research groups.

    Dates

    • Received 27 February 2024; Accepted 8 May 2024; Published online xxxxxx

    Rights and permissions
    • Copyright: © 2024 by the author(s). Published by Maximum Academic Press on behalf of Hainan University. This article is an open access article distributed under Creative Commons Attribution License (CC BY 4.0), visit https://creativecommons.org/licenses/by/4.0/.
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    Zhang X, Holley R, Egesi CN, Gemenet DC, Moreta D, et al. 2024. Towards transforming cassava breeding: harnessing inbred-parent-based hybrid breeding strategies. Tropical Plants doi: 10.48130/tp-0024-0024
    Zhang X, Holley R, Egesi CN, Gemenet DC, Moreta D, et al. 2024. Towards transforming cassava breeding: harnessing inbred-parent-based hybrid breeding strategies. Tropical Plants doi: 10.48130/tp-0024-0024
    shu

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