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Hazelnut germplasm innovation: induction of tetraploid hybrid hazelnut by colchicine

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Abstract

The hazelnut industry requires further development given the gap between production and demand. However, polyploid plantlet induction has not been reported in hazelnut varieties. As such, our aim in this study was to enrich the hazelnut germplasm resources. We used the shoot tips of in vitro propagated plantlets of Corylus heterophylla × Corylus avellana '84–226' as the material for inducing polyploidy. We supplemented the culture medium with 0, 100, 200, and 300 mg/L of colchicine, and we treated shoot tips for 20, 25, or 30 days. We found that the induction rate of tetraploids was the highest in treatments with 300 mg/L for 25 days; it was substantially higher by up to 20% than in the other treatments. In diploid and tetraploid tissue-cultured seedlings, tetraploid plantlets were much shorter, thicker, and stronger, as well as greener, than the diploid plantlets. The acquisition of polyploid hazelnuts provides an important prerequisite for hazelnut breeding.

Key message

We successful induced tetraploids of Corylus heterophylla × Corylus avellana '84–226', achieving a breakthrough as polyploid hazelnut has not previously appeared in nature, thereby enriching the hazelnut germplasm resources.

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All data generated or analysed during this study are included in the article.

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Acknowledgements

This study was supported by the National Horticultural Germplasm Shenyang Hawthorn Branch Library Operation Service (NHGRC2020-NH08) and Collection, Identification, Numbering, Breeding, and Storage of Hawthorn Germplasm Resources (19200357).

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Contributions

Ke Zheng carried out the experiment, collected and analysed data, and wrote the manuscript. Wenxuan Dong was involved in planning and supervising the study. Jian Wang performed part of the experiment. Xiao Zhang and Yali Hou assisted in the design of the study. All authors read and approved the final manuscript.

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Correspondence to Wenxuan Dong.

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The authors declare that they have no conflict of interest.

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Communicated by Maria Antonietta Germanà.

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Zheng, K., Wang, J., Zhang, X. et al. Hazelnut germplasm innovation: induction of tetraploid hybrid hazelnut by colchicine. Plant Cell Tiss Organ Cult 152, 21–29 (2023). https://doi.org/10.1007/s11240-022-02385-3

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  • DOI: https://doi.org/10.1007/s11240-022-02385-3

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