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Stoffel-Studer, I.

Publications and source records attributed to Stoffel-Studer, I..

2 recordsLinked to original sources

Near-complete, haplotype-resolved genome assembly of common buckwheat (Fagopyrum esculentum Moench)

Common buckwheat (Fagopyrum esculentum Moench) is a globally cultivated pseudocereal with a high nutritional quality and economic value. Due to its self-incompatibility, common buckwheat exhibits a high level of heterozygosity, making genome assembly challenging. Consequently, reference-level haplotype-resolved assemblies of common buckwheat are scarce, hindering research and genomics-assisted breeding. Here, we present a near-complete, chromosome-level, haplotype-resolved assembly of a common buckwheat F1 genotype (named Tuka), generated using a trio-binning approach that integrated parental Illumina short-read data with PacBio HiFi and Hi-C data from Tuka. The Tuka assembly comprises two haplomes, Tuka_h1 and Tuka_h2, both showing high contiguity (contig N50 of 76.68 Mb and 84.57 Mb, respectively), high completeness (assembly sizes of 1.28 Gb and 1.23 Gb with BUSCO scores of 96.9% and 96.8%, respectively), high base-level accuracy (QV of 59.08 and 63.03, respectively), and few gaps (35 and 30, respectively). This near-complete assembly of Tuka serves as a valuable genomic resource for common buckwheat, enabling advanced genomic analyses and accelerating research and breeding using state-of-the-art genomic tools.

genomics↗

The first nested association mapping (NAM) population for outbreeding Italian ryegrass reveals candidate genes for seed shattering and related traits

Nested association mapping (NAM) populations are a powerful tool for investigating the genetic control of agronomically important traits and have been successfully used in many inbreeding crops. Here, we present the first NAM population established in an outcrossing forage grass species, Italian ryegrass (Lolium multiflorum Lam.), to dissect the genetic control of seed shattering. The NAM population was based on 23 diverse and one common founder plants and consisted of 708 F2 individuals. Reduced-representation sequencing (ddRAD) of the 708 F2 individuals, combined with whole genome sequencing data of the 24 founder plants, yielded a total of 3,199,253 SNPs that were used for population structure analysis, parentship analysis and genome-wide association studies. Phenotypic data for seed shattering and seed yield-related traits, collected in three year x location environments, showed high phenotypic variance within the NAM population. A total of seven QTL were identified for seed shattering, seed yield, spike length, flag leaf length and flowering time. Within these QTL regions, one candidate gene for seed shattering and three candidate genes for flowering time were identified. For seed shattering, the significant SNP association within the gene chr7.26897, known to be in involved in ripening-related pathways, explained 10.03% of the phenotypic variance. These candidate genes identified provide valuable targets for functional validation and demonstrate the effectiveness of NAM populations for elucidating the genetic architecture of complex traits in outcrossing forage grasses.

plant biology↗