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Seed cryopreservation without vitrification (PVS2) induces oxidative stimuli to promote endoreplication in red pitaya seedlings

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Abstract

Endoreplication is a process by which cells replicate their genomes without mitosis, resulting in an increase in nuclear DNA ploidy. This study is the first to report that oxidative stimuli from cryopreservation of seeds in liquid nitrogen induces endoreplication. We list evidence that the cryopreservation of red pitaya seeds (Hylocereus costaricensis) in liquid nitrogen for 30 and 60 days induced genome duplication stimuli via endoreplication. It was demonstrated that this conservation technique modulates the levels of hydrogen peroxide (H2O2) and antioxidant enzymes, triggering oxidative stimuli. The flow cytometry analysis of cladodes revealed different levels of ploidy between the tissues (mixoploidy) and that seedlings from the longest cryopreservation times of seeds showed higher percentages of octoploid nuclei when compared to the control treatment. The cryopreservation of seeds for 60 days also allowed increases of approximately 130% in seedling biomass, which is possibly related to the increases in ploidy levels resulting from endoreplication. It was also shown that cryopreservation of seeds with cryoprotectant solutions (PVS2) increases the efficiency of antioxidant metabolism in eliminating H2O2, repressing oxidative signalling and consequently endoreplication, maintaining ploidy levels and stable growth patterns.

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Key Message

Oxidative signaling in seeds (induced by cryopreservation) triggers stimuli to promote endoreplication in pitaya seedlings, resulting increases in ploidy levels and in plant biomass.

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Data will be made available on request.

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Acknowledgements

This study was carried out with the support of the Instituto Federal de Educação do Norte de Minas Gerais—Brazil (IFNMG), the Universidade Federal de Lavras—Brazil (UFLA), the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—Brazil (CAPES), Conselho Nacional de Desenvolvimento Científico e Tecnológico—Brazil (CNPq) and the Fundação de Amparo à Pesquisa do Estado de Minas Gerais—Brazil (FAPEMIG).

Funding

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior, Conselho Nacional de Desenvolvimento Científico e Tecnológico, Fundação de Amparo à Pesquisa do Estado de Minas Gerais.

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Contributions

BIDS, RP and MVR: conceived and designed the research. BIDS, LVVB, EMR and JMSC: conducted the experiments. BIDS, LVVB, EMR and JMSC: data analysis and interpretation. BIDS, RP and MVR: writing and editing.

Corresponding author

Correspondence to Breno Ítalo Durães Santana.

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Authors declare no conflict of interest.

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Communicated by Wenlu Bi.

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Santana, B.Í.D., Paiva, R., Reis, M.V. et al. Seed cryopreservation without vitrification (PVS2) induces oxidative stimuli to promote endoreplication in red pitaya seedlings. Plant Cell Tiss Organ Cult 156, 11 (2024). https://doi.org/10.1007/s11240-023-02642-z

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  • DOI: https://doi.org/10.1007/s11240-023-02642-z

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