ArticleProceedings of the National Academy of Sciences of the United States of America2007
Diploid apomicts of the Boechera holboellii complex display large-scale chromosome substitutions and aberrant chromosomes.
Article in Proceedings of the National Academy of Sciences of the United States of America, 2007. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 54 papers.
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54 citing papers in PubMed, 114 citations in OpenAlex.
- The Genus Boechera as a Model for Apomixis Research.Methods in molecular biology (Clifton, N.J.) · 2026Article
- Genetic Mapping in Apomicts.Methods in molecular biology (Clifton, N.J.) · 2026Article
- Apomixis and the paradox of sex in plants.Annals of botany · 2024Review
- Sex- versus apomixis-specific polymorphisms in the 5'UTR of APOLLO fromFrontiers in plant science · 2024Article
- Apomixis: oh, what a tangled web we have!Planta · 2023Review
- Geographical Parthenogenesis in Alpine and Arctic Plants.Plants (Basel, Switzerland) · 2023Review
- Evolution of Transcriptomes in Early-Generation Hybrids of the ApomicticInternational journal of molecular sciences · 2022Article
- Seed size, endosperm and germination variation in sexual and apomicticFrontiers in plant science · 2022Article
- Evolution of an Apomixis-Specific Allele Class in Supernumerary Chromatin of ApomicticFrontiers in plant science · 2022Article
- Reproductive Output and Insect Behavior in Hybrids and Apomicts fromPlants (Basel, Switzerland) · 2021Article
- Evolution of B Chromosomes: From Dispensable Parasitic Chromosomes to Essential Genomic Players.Frontiers in genetics · 2021Review
- Identifying the fitness consequences of sex in complex natural environments.Evolution letters · 2020Article
- The relation of meiotic behaviour to hybridity, polyploidy and apomixis in the Ranunculus auricomus complex (Ranunculaceae).BMC plant biology · 2020Article
- Chasing the Apomictic Factors in theGenes · 2020Article
- Article
- Review
- Chromosomal Evolution and Apomixis in the Cruciferous Tribe Boechereae.Frontiers in plant science · 2020Article
- The story of promiscuous crucifers: origin and genome evolution of an invasive species, Cardamine occulta (Brassicaceae), and its relatives.Annals of botany · 2019Article
- Apospory and Diplospory in DiploidFrontiers in plant science · 2019Article
- Ovule Gene Expression Analysis in Sexual and Aposporous ApomicticFrontiers in plant science · 2019Article
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Authors and funding
6 authors at 4 institutions in 3 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
We conducted a cytogenetic study of sexual lines of Boechera stricta and Boechera holboellii (2n = 14) and seven diploid apomictic accessions of their interspecific hybrid Boechera divaricarpa and B. holboellii (2n = 14 or 15). By studying chromosome morphology, rDNA repeats, genome painting, male meiosis, pollen morphology, and flow-cytometry seed screens, we revealed an unexpected plethora of chromosome forms, pairing behavior, and hybrid composition in all apomictic lines. Genome painting demonstrated that the apomicts are alloploid with variable numbers of B. stricta and B. holboellii-like chromosomes. We assume that large-scale homeologous chromosome substitutions took place in the apomictic hybrids that resulted from recurrent diploid-polyploid transitions through restitutional meiosis and polyploidy-diploid transitions through reductional meiosis. A second peculiarity was the presence of a largely heterochromatic chromosome (Het) in all apomictic accessions (2n = 14 and 15) and an additional smaller chromosome (Del) in the aneuploids (2n = 15). Both chromosomes share repetitive pericentromere repeats with those from the sexual B. stricta, suggesting that they originated from this species. Pairing and behavior at meiosis I of the Het share features with both Y and B chromosomes and suggest that the Del arose from a translocation event or homeologous recombination between a B. holboellii (or related taxon) and a B. stricta chromosome. Based on its presence exclusively in apomictic accessions, we propose that the Het chromosome plays a role in the genetic control of apomixis.
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