ArticleAnnals of botany2023
Complex polyploid and hybrid species in an apomictic and sexual tropical forage grass group: genomic composition and evolution in Urochloa (Brachiaria) species.
Article in Annals of botany, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 14 papers.
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14 citing papers in PubMed, 35 citations in OpenAlex.
- A haplotype-complete chromosome-level assembly of octoploid Urochloa humidicola cv. Tully reveals multiple genomic compositions and evolutionary histories in the species.G3 (Bethesda, Md.) · 2026Article
- Genetic linkage mapping in Megathyrsus maximus (Jacq.) with multiple dosage markers.G3 (Bethesda, Md.) · 2025Article
- Thriving or Withering? Plant Molecular Cytogenetics in the First Quarter of the 21st Century.International journal of molecular sciences · 2025Review
- Complex pathways in plant-human relationships in changing environments: pollen, seeds, wood, molecules and weeds in the Early-Mid Holocene Sahara.Philosophical transactions of the Royal Society of London. Series B, Biological sciences · 2025Review
- A haplotype-resolved chromosome-level genome assembly of Urochloa decumbens cv. Basilisk resolves its allopolyploid ancestry and composition.G3 (Bethesda, Md.) · 2025Article
- Characterization of antibiotic resistance genes in soils from agroecosystems of the Brazilian Amazon.Frontiers in microbiology · 2025Article
- Phylogenomic analysis reveals five independently evolved African forage grass clades in the genus Urochloa.Annals of botany · 2024Article
- Advances in genomic characterization of Urochloa humidicola: exploring polyploid inheritance and apomixis.TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik · 2023Article
- Polyploidy: its consequences and enabling role in plant diversification and evolution.Annals of botany · 2023Article
- Diverged subpopulations in tropical Urochloa (Brachiaria) forage species indicate a role for facultative apomixis and varying ploidy in their population structure and evolution.Annals of botany · 2022Article
- The repetitive DNA sequence landscape and DNA methylation in chromosomes of an apomictic tropical forage grass,Frontiers in plant science · 2022Article
- Oat chromosome and genome evolution defined by widespread terminal intergenomic translocations in polyploids.Frontiers in plant science · 2022Article
- Allele mining in diverse accessions of tropical grasses to improve forage quality and reduce environmental impact.Annals of botany · 2021Article
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Authors and funding
10 authors at 5 institutions in 3 countries.
Funding
Abstract
BACKGROUND AND
aimsDiploid and polyploid Urochloa (including Brachiaria, Panicum and Megathyrsus species) C4 tropical forage grasses originating from Africa are important for food security and the environment, often being planted in marginal lands worldwide. We aimed to characterize the nature of their genomes, the repetitive DNA and the genome composition of polyploids, leading to a model of the evolutionary pathways within the group including many apomictic species.
methodsSome 362 forage grass accessions from international germplasm collections were studied, and ploidy was determined using an optimized flow cytometry method. Whole-genome survey sequencing and molecular cytogenetic analysis were used to identify chromosomes and genomes in Urochloa accessions belonging to the 'brizantha' and 'humidicola' agamic complexes and U. maxima. KEY
resultsGenome structures are complex and variable, with multiple ploidies and genome compositions within the species, and no clear geographical patterns. Sequence analysis of nine diploid and polyploid accessions enabled identification of abundant genome-specific repetitive DNA motifs. In situ hybridization with a combination of repetitive DNA and genomic DNA probes identified evolutionary divergence and allowed us to discriminate the different genomes present in polyploids.
conclusionsWe suggest a new coherent nomenclature for the genomes present. We develop a model of evolution at the whole-genome level in diploid and polyploid accessions showing processes of grass evolution. We support the retention of narrow species concepts for Urochloa brizantha, U. decumbens and U. ruziziensis, and do not consider diploids and polyploids of single species as cytotypes. The results and model will be valuable in making rational choices of parents for new hybrids, assist in use of the germplasm for breeding and selection of Urochloa with improved sustainability and agronomic potential, and assist in measuring and conserving biodiversity in grasslands.
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