Publications by authors named "Sylvie Negre"
Polyploidy or whole genome duplication is a frequent and recurrent phenomenon in flowering plants that has played a major role in their diversification, adaptation and speciation. The adaptive success of polyploids relates to the different evolutionary fates of duplicated genes. In this study, we explored the impact of the whole genome triplication (WGT) event in the Brassiceae tribe on the genes involved in the self-incompatibility (SI) signalling pathway, a mechanism allowing recognition and rejection of self-pollen in hermaphrodite plants.
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- * Researchers created advanced hybrids by cross-pollinating oilseed rape with wild radish and analyzed the genomic integration of oilseed rape regions in the hybrids over generations.
- * Results showed that certain genomic regions of oilseed rape are more susceptible to being incorporated into the wild radish’s genome and this gene transfer could affect plant traits like height and seed production, suggesting that transgene insertion should consider gene stability to prevent unwanted gene flow.
Article Synopsis
- Meiotic recombination through crossovers (COs) is crucial for genetic diversity, but typically occurs in a limited and uneven manner on chromosomes.
- Research indicates that using allotriploid hybrids from Brassica species can disrupt these patterns, leading to a significant increase in COs—1.7 to 3.4 times more than in diploids.
- This increase results in altered recombination landscapes and decreased CO interference, particularly noticeable in male allotriploid hybrids, which could greatly benefit geneticists and plant breeders by enhancing genetic diversity in Brassica species.
Allopolyploidy, which results from the merger and duplication of two divergent genomes, has played a major role in the evolution and diversification of flowering plants. The genomic changes that occur in resynthesized or natural neopolyploids have been extensively studied, but little is known about the effects of the reproductive mode in the initial generations that may precede its successful establishment. To truly reflect the early generations of a nascent polyploid, two resynthesized allotetraploid populations were obtained for the first time by open pollination.
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- Allopolyploid species' genomes change over time, but the long-term effects on the relationship between the original genomes are still unclear.
- The study extracted the diploid AA component from Brassica napus, showing that only one method was successful and the resulting plants had less of the expected A subgenome.
- The research suggests that during coevolution over about 7,500 years, subgenome interdependency can arise due to structural changes, with some gene losses compensated by genes from related species.
The French wheat variety 'Camp Remy' (CR) possesses a durable, adult plant resistance to yellow rust (YR), caused by the pathogen Puccinia striiformis. Using cDNA-AFLP on different sets of heterogeneous inbred families (HIFs) derived from the cross CR x Récital, we compared gene expression profiles during one seedling and two adult developmental stages following inoculation with P. striiformis.
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