2026-10-14T08:55:59Z https://api.figshare.com/v2/oai

oai:figshare.com:article/33399301 2026-09-29T13:53:01Z category_24310 portal_349 item_type_3 month_year_09_2026

Supplementary Material for Lamon et al., 2026 Samuele Lamon (23412420) Peter M. Bourke (25072550) Brian L. Abernathy (25072561) João F. dos Santos (25072578) Ignácio J. de Godoy (25072584) Soraya C. M. Leal-Bertioli (10891784) David J. Bertioli (11953112) Genomics Arachis hypogaea polyploidy double reduction homoeologous exchange genetic instability linkage mapping segmental allopolyploidy <p dir="ltr">Double reduction is a rare polyploid-specific segregation pattern in which a single-dosage locus produces a duplex gamete. Although peanut (<i>Arachis hypogaea</i>) mainly shows disomic pairing, its segmental allotetraploid genome can occasionally form multivalents, allowing double reduction to occur. We detected double reduction using a backcross population between cultivated peanut and the neoallotetraploid [<i>A. magna</i> × <i>A. stenosperma</i>]^4x (MagSten) and a high-density phased linkage map containing 9,717 SNP markers. Initial mapping artifacts were traced to progenies with unbalanced chromosomal compositions caused by homoeologous exchange; removing these individuals resolved the artifacts. Double reduction was detected in 12% of progenies. This deposit contains the supplementary tables and figures supporting the analysis.</p><p dir="ltr">Contents:</p><p dir="ltr">Supplementary Table 1 – Supplementary Table 4 — SNP dosage scores, the final marker set with map positions, pericentromere boundaries, and a summary of DR events by individual and linkage group.</p><p dir="ltr">Supplementary Figure 1 – Supplementary Figure 12 — Marker filtering and dosage-type distributions, concordance between genotype-calling phase and linkage-map phase, the genome-wide distribution of interspersed genotyping patterns, step-by-step construction of pseudo-integrated linkage maps across chromosomes via centromere alignment, heatmaps of cross-linkage-group LOD scores, and Hidden Markov Model analyses, including genotyping error-rate diagnostics and posterior identity-by-descent probability visualizations, used to independently evaluate candidate DR and homoeologous exchange events.</p><p dir="ltr">Supplementary Figure Legends — full legends for Supplementary Figure 1 – Supplementary Figure 12.</p> 2026-09-29T13:53:01Z Dataset Dataset 10.25387/g3.33399301.v2 https://figshare.com/articles/dataset/Supplementary_Material_for_Lamon_et_al_2026/33399301 CC BY 4.0