Genome size variation in wild and cultivated maize along altitudinal gradients

Díez, Concepción M.; Gaut, Brandon S.; Meca, Esteban; Scheinvar, Enrique; Montes‐Hernández, Salvador; Eguiarte, Luis E.; Tenaillon, Maud I.

doi:10.1111/nph.12247

Cited by 115 publications

(153 citation statements)

References 49 publications

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“…The existence of intraspecific variation in genome size is controversial. Although numerous studies have reported intraspecific variation (Schmuths et al 2004;Wang et al 2009;Díez et al 2013), it is more common to find stability within species (Lysák et al 2000;Greilhuber et al 2005;Eilam et al 2007), and some perceived intraspecific variation may be explained by other factors such as endogenous staining inhibitors or other methodical noise (Greilhuber 2005;Noirot et al 2005;Loureiro et al 2006). Thus, our results are consistent with the concept of intra-species stability in genome size.…”

Section: Intraspecific Variation In Genome Sizesupporting

confidence: 82%

“…In contrast to intraspecific stability, numerous studies in plants have reported large variations in genome size among species within genera (Schmuths et al 2004;Wang et al 2009;Díez et al 2013). Retro-elements and polyploidization are considered to be primary factors leading to the variations in genome size (Piegu et al 2006;Grover and Wendel 2010).…”

Section: Interspecific Variation In Genome Sizementioning

confidence: 99%

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Genome size variation in the genus Avena

Yan

Martin

Bekele

et al. 2016

Genome

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Abstract:Genome size is an indicator of evolutionary distance and a metric for genome characterization. Here, we report accurate estimates of genome size in 99 accessions from 26 species of Avena. We demonstrate that the average genome size of C genome diploid species (2C = 10.26 pg) is 15% larger than that of A genome species (2C = 8.95 pg), and that this difference likely accounts for a progression of size among tetraploid species, where AB < AC < CC (average 2C = 16.76, 18.60, and 21.78 pg, respectively). All accessions from three hexaploid species with the ACD genome configuration had similar genome sizes (average 2C = 25.74 pg). Genome size was mostly consistent within species and in general agreement with current information about evolutionary distance among species. Results also suggest that most of the polyploid species in Avena have experienced genome downsizing in relation to their diploid progenitors. Genome size measurements could provide additional quality control for species identification in germplasm collections, especially in cases where diploid and polyploid species have similar morphology.Key words: oat, flow cytometry, nucleus, polyploidy.Résumé : La taille du génome est un indicateur de la distance évolutive et constitue un paramètre pour la caractéri-sation des génomes. Ici, les auteurs rapportent des estimés précis de la taille du génome chez 99 accessions appartenant à 26 espèces du genre Avena. Les auteurs montrent que la taille moyenne du génome chez les espèces diploïdes ayant un génome C (2C = 10,26 pg) est 15 % supérieure à celui des espèces ayant un génome A (2C = 8,95 pg), et que cette différence explique vraisemblablement la progression dans la taille des génomes parmi les espèces tétraploïdes, où AB < AC < CC (en moyenne, 2C = 16,76, 18,60 et 21,78 pg, respectivement). Toutes les accessions des trois espèces hexaploïdes ayant une composition génomique ACD présentaient des tailles de génome comparables (en moyenne, 2C = 25,74 pg). La taille du génome était généralement stable au sein d'une espèce, et conforme aux connaissances actuelles en ce qui a trait aux distances évolutives entre elles. Les résultats suggèrent également que la plupart des espèces polyploïdes du genre Avena ont connu une réduction de la taille du génome par rapport aux espèces diploïdes ancestrales. Les mesures de la taille du génome pourraient fournir une source additionnelle de contrôle de qualité lors de l'identification des espèces au sein de collections de ressources génétiques, particulièrement dans les cas où des espèces diploïdes et polyploïdes présentent une morphologie semblable. [Traduit par la Rédaction] Mots-clés : avoine, cytométrie en flux, noyau, polyploïdie.

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Section: Intraspecific Variation In Genome Sizesupporting

confidence: 82%

Section: Interspecific Variation In Genome Sizementioning

confidence: 99%

Genome size variation in the genus Avena

Yan

Martin

Bekele

et al. 2016

Genome

View full text Add to dashboard Cite

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“…We assembled seeds from 12 to 15 individuals from 16 of the populations described in Díez et al. () and from 12 additional locations (Table and Fig. ).…”

Section: Methodsmentioning

confidence: 99%

Connecting genomic patterns of local adaptation and niche suitability in teosintes

et al. 2017

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The central abundance hypothesis predicts that local adaptation is a function of the distance to the centre of a species' geographic range. To test this hypothesis, we gathered genomic diversity data from 49 populations, 646 individuals and 33,464 SNPs of two wild relatives of maize, the teosintes Zea mays ssp. parviglumis and Zea. mays. ssp. mexicana. We examined the association between the distance to their climatic and geographic centroids and the enrichment of SNPs bearing signals of adaptation. We identified candidate adaptive SNPs in each population by combining neutrality tests and cline analyses. By applying linear regression models, we found that the number of candidate SNPs is positively associated with niche suitability, while genetic diversity is reduced at the limits of the geographic distribution. Our results suggest that overall, populations located at the limit of the species' niches are adapting locally. We argue that local adaptation to this limit could initiate ecological speciation processes and facilitate adaptation to global change.

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“…Yet, a few studies have assessed within-species correlates of GS [23,24]. In Drosophila melanogaster, GS varies across populations, and Vieira & Biemont [25] suggested that novel genetic variability induced by the mobilization of transposable elements could allow populations to adapt more successfully to novel environments, but support for this hypothesis is equivocal [26].…”

Section: Introductionmentioning

confidence: 99%

Genome size correlates with reproductive fitness in seed beetles

et al. 2015

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The ultimate cause of genome size (GS) evolution in eukaryotes remains a major and unresolved puzzle in evolutionary biology. Large-scale comparative studies have failed to find consistent correlations between GS and organismal properties, resulting in the 'C-value paradox'. Current hypotheses for the evolution of GS are based either on the balance between mutational events and drift or on natural selection acting upon standing genetic variation in GS. It is, however, currently very difficult to evaluate the role of selection because within-species studies that relate variation in lifehistory traits to variation in GS are very rare. Here, we report phylogenetic comparative analyses of GS evolution in seed beetles at two distinct taxonomic scales, which combines replicated estimation of GS with experimental assays of life-history traits and reproductive fitness. GS showed rapid and bidirectional evolution across species, but did not show correlated evolution with any of several indices of the relative importance of genetic drift. Within a single species, GS varied by 4-5% across populations and showed positive correlated evolution with independent estimates of male and female reproductive fitness. Collectively, the phylogenetic pattern of GS diversification across and within species in conjunction with the pattern of correlated evolution between GS and fitness provide novel support for the tenet that natural selection plays a key role in shaping GS evolution.

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Genome size variation in wild and cultivated maize along altitudinal gradients

Cited by 115 publications

References 49 publications

Genome size variation in the genus Avena

Genome size variation in the genus Avena

Connecting genomic patterns of local adaptation and niche suitability in teosintes

Genome size correlates with reproductive fitness in seed beetles

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