ArticleBMC plant biology2014
Triparental origin of triploid onion, Allium × cornutum (Clementi ex Visiani, 1842), as evidenced by molecular, phylogenetic and cytogenetic analyses.
Article in BMC plant biology, 2014. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 11 papers.
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11 citing papers in PubMed, 23 citations in OpenAlex.
- A near-complete genome assembly of onion resolves its genomic architecture, origin, and evolution.Plant communications · 2026Article
- Intragenomic rDNA variation - the product of concerted evolution, mutation, or something in between?Heredity · 2023Review
- The Use of Ribosomal DNA for Comparative Cytogenetics.Methods in molecular biology (Clifton, N.J.) · 2023Article
- Phytochemical Characterization and Screening of Antioxidant, Antimicrobial and Antiproliferative Properties ofPlants (Basel, Switzerland) · 2021Article
- Shallot Species and Subtypes Discrimination Based on Morphology Descriptors.Plants (Basel, Switzerland) · 2020Article
- Comparison of Organosulfur and Amino Acid Composition between Triploid OnionPlants (Basel, Switzerland) · 2020Article
- The Utility of Graph Clustering of 5S Ribosomal DNA Homoeologs in Plant Allopolyploids, Homoploid Hybrids, and Cryptic Introgressants.Frontiers in plant science · 2020Article
- Karyotype analysis of eight cultivated Allium species.Journal of applied genetics · 2019Article
- Morphological and Biochemical Diversity of Shallot Landraces Preserved Along the Croatian Coast.Frontiers in plant science · 2018Article
- Chemical Composition and Biological Activity of Allium cepa L. and Allium × cornutum (Clementi ex Visiani 1842) Methanolic Extracts.Molecules (Basel, Switzerland) · 2017Article
- rDNA Loci Evolution in the Genus Glechoma (Lamiaceae).PloS one · 2016Article
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Authors and funding
6 authors at 2 institutions in 2 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
backgroundReconstruction of the parental origins of cultivated plants from wild relatives, especially after long periods of domestication, is not a trivial task. However, recent advances in molecular phylogenetics, among other approaches, have proved to be very informative in analyses of the origin and evolution of polyploid genomes. An established minor garden crop, triploid onion Allium × cornutum (Clementi ex Visiani, 1842) (2n = 3x = 24), is widespread in southeastern Asia and Europe. Our previous cytogenetic analyses confirmed its highly heterozygous karyotype and indicated its possible complex triparental genome origin. Allium cepa L. and Allium roylei Stearn were suggested as two putative parental species of A. × cornutum, whereas the third parental species remained hitherto unknown.
resultsHere we report the phylogenetic analyses of the internal transcribed spacers ITS1-5.8S-ITS2 of 35S rDNA and the non-transcribed spacer (NTS) region of 5S rDNA of A. × cornutum and its relatives of the section Cepa. Both ITS and NTS sequence data revealed intra-individual variation in triploid onion, and these data clustered into the three main clades, each with high sequence homology to one of three other species of section Cepa: A. cepa, A. roylei, and unexpectedly, the wild Asian species Allium pskemense B. Fedtsh. Allium pskemense is therefore inferred to be the third, so far unknown, putative parental species of triploid onion Allium × cornutum. The 35S and 5S rRNA genes were found to be localised on somatic chromosomes of A. × cornutum and its putative parental species by double fluorescent in situ hybridisation (FISH). The localisation of 35S and 5S rDNA in A. × cornutum chromosomes corresponded to their respective positions in the three putative parental species, A. cepa, A. pskemense, and A. roylei. GISH (genomic in situ hybridisation) using DNA of the three putative parental diploids corroborated the results of the phylogenetic study.
conclusionsThe combined molecular, phylogenetic and cytogenetic data obtained in this study provided evidence for a unique triparental origin of triploid onion A. × cornutum with three putative parental species, A. cepa, A. pskemense, and A. roylei.
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