000171102 001__ 171102
000171102 005__ 20260506144057.0
000171102 0247_ $$2doi$$a10.1016/j.ympev.2026.108627
000171102 0248_ $$2sideral$$a149206
000171102 037__ $$aART-2026-149206
000171102 041__ $$aeng
000171102 100__ $$aMartín-Hernanz, Sara
000171102 245__ $$aGenome size evolution in Helianthemum (Cistaceae): Dynamic genomes within a conserved chromosomal framework
000171102 260__ $$c2026
000171102 5060_ $$aAccess copy available to the general public$$fUnrestricted
000171102 5203_ $$aGenome size is a fundamental biological characteristic, yet its evolutionary dynamics remain insufficiently understood, partly because few plant groups offer the cytogenetic and phylogenomic data required for genus-level analyses. In this study, we estimated genome size (2C values) for 80 species (c, 75% of the genus), covering all infrageneric categories (three subgenera, ten sections). Genome-size evolution was examined within a newly generated, time-calibrated phylogenetic framework based on the Angiosperms353 target-capture probe set including 89% of the species in the genus, and integrated with updated karyotype descriptors including chromosome numbers, total haploid karyotype length (THL), interchromosomal coefficient of variation in chromosome length (CVCL), and intrachromosomal mean centromeric asymmetry (MCA). Genome size varied 6.5-fold across the genus, ranging from 1.65 to 10.60 pg (i.e., from very small to intermediate genomes). Phylogenetically informed regressions revealed a strong positive relationship between 2C values and THL, indicating that changes in nuclear DNA content are accommodated by proportional modifications in chromosome size. In contrast, genome size showed no significant association with chromosome number or karyotype asymmetry, suggesting that genome-size diversification has occurred largely independently of major chromosomal rearrangements. Chromosome-number reconstructions confirmed a highly conserved karyotype across the genus, with only a single abrupt shift and a small number of minor dysploid changes. Ancestral-state reconstruction and comparative evolutionary modelling revealed that genome-size diversification is strongly shaped by phylogenetic structure and characterised by repeated reductions from an intermediate ancestral genome. Overall, Helianthemum provides a powerful model for understanding how genome size evolves within a conserved chromosomal framework.
000171102 540__ $$9info:eu-repo/semantics/openAccess$$aby$$uhttps://creativecommons.org/licenses/by/4.0/deed.es
000171102 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion
000171102 700__ $$aAlbaladejo, Rafael G.
000171102 700__ $$0(orcid)0000-0001-5658-8411$$aViruel, Juan$$uUniversidad de Zaragoza
000171102 700__ $$aMatos, Rafael
000171102 700__ $$aLopes, Sara Brito
000171102 700__ $$aRubio, Encarnación
000171102 700__ $$aCastro, Mariana
000171102 700__ $$aLoureiro, João
000171102 700__ $$aVolkova, Polina
000171102 700__ $$aAparicio, Abelardo
000171102 7102_ $$15011$$2063$$aUniversidad de Zaragoza$$bDpto. CC.Agrar.y Medio Natural$$cÁrea Botánica
000171102 773__ $$g221 (2026), 108627 [13 pp.]$$pMol. phylogenet. evol.$$tMOLECULAR PHYLOGENETICS AND EVOLUTION$$x1055-7903
000171102 8564_ $$s8078904$$uhttps://zaguan.unizar.es/record/171102/files/texto_completo.pdf$$yVersión publicada
000171102 8564_ $$s2418294$$uhttps://zaguan.unizar.es/record/171102/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada
000171102 909CO $$ooai:zaguan.unizar.es:171102$$particulos$$pdriver
000171102 951__ $$a2026-05-06-13:58:39
000171102 980__ $$aARTICLE