A5040423341- Chromosomal and Genetic Variations
- Nitrogen and Sulfur Effects on Brassica
- Genomics and Phylogenetic Studies
- Plant Disease Resistance and Genetics
- Plant tissue culture and regeneration
- Plant nutrient uptake and metabolism
- Phytase and its Applications
- Garlic and Onion Studies
- Photosynthetic Processes and Mechanisms
- Plant Reproductive Biology
- Bee Products Chemical Analysis
- Evolution and Genetic Dynamics
- CRISPR and Genetic Engineering
- Cholesterol and Lipid Metabolism
- Plant Virus Research Studies
- Agriculture and Rural Development Research
- Soybean genetics and cultivation
- Lipid metabolism and biosynthesis
- Genetic diversity and population structure
- Botanical Research and Chemistry
- Potato Plant Research
- Genetic and Environmental Crop Studies
- Genetically Modified Organisms Research
- Edible Oils Quality and Analysis
- Plant biochemistry and biosynthesis
Institut de Génétique, Environnement et Protection des Plantes
2015-2025
Université de Rennes
2016-2025
Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement
1987-2025
L'Institut Agro
2020-2022
Institut Agro Rennes-Angers
2016-2019
Département Biologie et Amélioration des Plantes
1983-1997
Anna Needs Neuroblastoma Answers
1992
The combination of long reads and long-range information to produce genome assemblies is now accepted as a common standard. This strategy not only allows access the gene catalogue given species but also reveals architecture organization chromosomes, including complex regions such telomeres centromeres. Brassica genus exempt, many based on are available. reference for napus, Darmor-bzh, which was published in 2014, produced using short its contiguity extremely low compared with current genus....
The Fabaceae family is considered as a model system for understanding chloroplast genome evolution due to the presence of extensive structural rearrangements, gene losses and localized hypermutable regions. Here, we provide sequences four genomes from Lupinus genus, belonging underinvestigated Genistoid clade. Notably, found in species functional loss essential rps16 gene, which was most likely replaced by nuclear that encodes mitochondrion targeted RPS16 proteins. To study evolutionary fate...
Summary Meiotic recombination is a major evolutionary process generating genetic diversity at each generation in sexual organisms. However, this highly regulated, with the majority of crossovers lying distal chromosomal regions that harbor low DNA methylation levels. Even these regions, some islands without remain, for which we investigated underlying causes. Genetic maps were established two Brassica napus hybrids to detect presence such large nonrecombinant islands. The role played by and...
Meiotic recombination by crossovers (COs) is tightly regulated, limiting its key role in producing genetic diversity. However, while COs are usually restricted number and not homogenously distributed along chromosomes, we show here how to disrupt these rules Brassica species using allotriploid hybrids (AAC, 2n = 3x 29), resulting from the cross between allotetraploid rapeseed (B. napus, AACC, 4x 38) one of diploid progenitors rapa, AA, 2x 20). We produced mapping populations different...
Nitrogen use efficiency is an important breeding trait that can be modified to improve the sustainability of many crop species used in agriculture. Rapeseed a major oil with low nitrogen efficiency, making its production highly dependent on input. This complex suspected sensitive genotype × environment interactions, especially interactions. Therefore, phenotyping diverse rapeseed populations under dense network trials powerful approach study this crop. The present aimed determine...
Several plastid macromolecular protein complexes are encoded by both nuclear and genes. Therefore, cytonuclear interactions held in place to prevent genomic conflicts that may lead incompatibilities. Allopolyploidy resulting from hybridization genome doubling of two divergent species can disrupt these fine-tuned interactions, as newly formed allopolyploid confront biparental chromosomes with a uniparentally inherited genome. To avoid any deleterious effects unequal inheritance, preferential...
Allopolyploids have globally higher fitness than their diploid progenitors; however, by comparison, most resynthesized allopolyploids poor fertility and highly unstable genome. Elucidating the evolutionary processes promoting genome stabilization is thus essential to comprehend allopolyploid success. Using Brassica model, we mimicked speciation process of a nascent species resynthesizing allotetraploid napus systematically selecting for euploid individuals over eight generations in four...
Abstract The tight regulation of meiotic recombination between homologs is disrupted in Brassica AAC allotriploids, a genomic configuration that may have facilitated the formation rapeseed (Brassica napus L.) ∼7,500 years ago. Indeed, presence haploid C genome induces supernumerary crossovers homologous A chromosomes with dramatically reshaped distribution. However, genetic mechanisms driving this phenomenon and their divergence nascent established lineages remain unclear. To address these...
Locating centromeres on genome sequences can be challenging. The high density of repetitive elements in these regions makes sequence assembly problematic, especially when using short-read sequencing technologies. It also difficult to distinguish between active and recently extinct through analysis. An effective solution is identify genetically (functional meiosis) by half-tetrad This genetic approach involves detecting heterozygosity along chromosomes segregating populations derived from...
Traditionally, reference genomes in crop species rely on the assembly of one accession, thus occulting most intraspecific diversity. However, rearrangements, gene duplications and transposable element content may have a large impact genomic structure, which could generate new phenotypic traits. Using two Brassica rapa recently sequenced assembled using long-read technology optical mapping, we investigated structural variants repetitive between accessions genome size variation among core...
Abstract Allopolyploidy, which results from the merger and duplication of two divergent genomes, has played a major role in evolution diversification flowering plants. The genomic changes that occur resynthesized or natural neopolyploids have been extensively studied, but little is known about effects reproductive mode initial generations may precede its successful establishment. To truly reflect early nascent polyploid, allotetraploid Brassica napus populations were obtained for first time...
Meiotic recombination is the main tool used by breeders to generate biodiversity, allowing genetic reshuffling at each generation. It enables accumulation of favorable alleles while purging deleterious mutations. However, this mechanism highly regulated with formation one rarely more than three crossovers, which are not randomly distributed. In study, we showed that it possible modify these controls in oilseed rape (Brassica napus, AACC, 2n = 4x 38) and linked AAC allotriploidy polyploidy...
Constitutive genomes of allopolyploid species evolve throughout their life span. However, the consequences long-term alterations on interdependency between each original genome have not been established. Here, we attempted an approach corresponding to subgenome extraction from a previously sequenced natural allotetraploid, offering unique opportunity evaluate plant viability and structural evolution one its diploid components. We employed two different strategies extract AA component...
Abstract Meiotic recombination is a key biological process in plant evolution and breeding, as it generates genetic diversity each generation through the formation of crossovers (COs). However, due to their importance genome stability, COs are highly regulated frequency distribution. We previously demonstrated that this strict regulation can be modified, both terms CO distribution, allotriploid Brassica hybrids (2n = 3x 29; AAC) resulting from cross between napus 4x 38; AACC) rapa 2x 20;...
Abstract Background The combination of long-reads and long-range information to produce genome assemblies is now accepted as a common standard. This strategy not only allow access the gene catalogue given species but also reveals architecture organisation chromosomes, including complex regions like telomeres centromeres. Brassica genus exempt many based on long reads are available. reference for napus , Darmor-bzh, which was published in 2014, has been produced using short-reads its...
The effect of gene location within a crop genome on its transfer to weed remains an open question for flow assessment. To elucidate this question, we analyzed advanced generations intergeneric hybrids, derived from initial pollination known oilseed rape varieties (Brassica napus, AACC, 2n = 38) by local population wild radish (Raphanus raphanistrum, RrRr, 18). After five recurrent pollination, 307 G5 plants with chromosome number similar were genotyped using 105 B. napus specific markers...
Abstract Meiotic recombination is a key biological process in plant evolution and breeding, as it generates novel genetic diversity at each generation. However, due to its importance chromosome segregation genomic stability, crossovers are highly regulated both frequency distribution. We previously demonstrated that this strict regulation not fatality can be naturally modified (3.6-fold increased altered distribution) an allotriploid Brassica hybrid (2 n =3 x =29; AAC), resulting from cross...
Summary The tight regulation of meiotic recombination between homologs is disrupted in Brassica AAC allotriploids, a genomic configuration that may have facilitated the formation rapeseed ( napus L.) ∼7,500 years ago. Indeed, presence haploid C genome induces supernumerary crossovers homologous A chromosomes with dramatically reshaped distribution. However, genetic mechanisms driving this phenomenon and their divergence nascent established lineages remain unclear. To address these concerns,...
ABSTRACT Traditionally, reference genomes in crop species rely on the assembly of one accession, thus occulting most intraspecific diversity. However, rearrangements, gene duplications and transposable element content may have a large impact genomic structure, which could generate new phenotypic traits. Using two Brassica rapa recently sequenced assembled using long-read technology optical mapping, we investigated structural variants repetitive between accessions genome size variation among...