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Morphological, cariological, and phytochemical studies of diploid and autotetraploid Hippeastrum papilio plants

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The polyploidization of Hippeastrum papilio influences its primary and secondary metabolism including the biosynthesis of bioactive alkaloids.

Abstract

Hippeastrum papilio is an ornamental plant that has advantages in comparison to the currently used plants for the extraction of galanthamine, a natural compound used for the cognitive treatment of Alzheimer’s disease. In the present study, an autotetraploid line of H. papilio was induced for the first time, after treatment with 0.05% colchicine for 48 h. The chromosome number in diploids was found to be 2n = 2x = 22 and for autotetraploids 2n = 4x = 44. The flow cytometric analyses detected a DNA C-value of 14.88 ± 0.03 pg (1C) in diploids and 26.57 ± 0.12 pg in autotetraploids. The morphological, cytological, and phytochemical studies showed significant differences between diploids and autotetraploids. The length and width of stomata in autotetraploids were 22.47% and 17.94%, respectively, larger than those observed in the diploid leaves. The biomass of one-year-old autotetraploid H. papilio plants was reduced by 53.99% for plants’ fresh weight, 56.53% for leaves’ fresh weight, and 21.70% for bulb diameter. The GC–MS analysis of methanol extracts from one-year-old diploid and autotetraploid H. papilio plants revealed over 60 primary and secondary metabolites including alkaloids, phenolic acids, sterols, saccharides, and alcohols, among others. Principal component analysis of the metabolite profiles indicates a divergence of the metabolism between diploid and autotetraploid plants. The content of galanthamine and haemanthamine was found to be 49.73% and 80.10%, respectively, higher in the leaves of autotetraploids, compared to the diploid ones. The biosynthesis of the saccharides shows a tendency to be upregulated in tetraploid plants, while that of phenolic acids was downregulated. Polyploidization of H. papilio creates possibilities for further crop improvement aimed at high-galanthamine-producing genotypes.

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All data generated or analysed during this study are included in this published article [and its supplementary information files].

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Acknowledgements

The authors acknowledge Ludwig & Co BV (The Netherlands), Holland Biodiversity BV (The Netherlands) and Plant Tech Ltd (Bulgaria) for the support and for providing plants and in vitro cultures of Hippeastrum papilio. The authors acknowledge Mrs. Zoya Mitrinska and Mrs. Nadezhda Hristova for the technical assistance in cytological analysis.

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Correspondence to Strahil Berkov.

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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Communicated by Anastasios Melis.

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Haist, G., Sidjimova, B., Vladimirov, V. et al. Morphological, cariological, and phytochemical studies of diploid and autotetraploid Hippeastrum papilio plants. Planta 257, 51 (2023). https://doi.org/10.1007/s00425-023-04084-5

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  • DOI: https://doi.org/10.1007/s00425-023-04084-5

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