Nuclear variation withinAvenae

Bullen, M. R.; Rees, H.

doi:10.1007/bf00320593

Cited by 31 publications

(10 citation statements)

References 14 publications

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“…Bennett ahd Smith (1971) and Bullen and Rees (1972) reported, however, no significant differences among 15 varieties of seven diploid species of Hordeum and among six diploids of Avena, respectively.…”

Section: Methodsmentioning

confidence: 96%

QUANTITATIVE VARIATION OF NUCLEAR DNA IN GENUS <i>AEGILOPS</i>

Furuta

1975

The Japanese journal of genetics

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Section: Methodsmentioning

confidence: 96%

QUANTITATIVE VARIATION OF NUCLEAR DNA IN GENUS <i>AEGILOPS</i>

Furuta

1975

The Japanese journal of genetics

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“…Genome size has been estimated in 16 species of Avena (Bullen and Rees 1972;Iiyama and Grant 1972;Bennett and Smith 1976;Crosby et al 2014) excluding three that are considered to be homotypic with others in the Kew database (Baum 1977). Most estimates in the Kew database were provided by Bennett and Smith (1976) who made additional estimates and attempted to calibrate these with prior estimates.…”

Section: Introductionmentioning

confidence: 99%

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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“…This is the situation reflected by results in the Triticinae (Rees and Walters, 1965;Nishikawa and Furuta, 1969;cf. Pai and Swaminathan, 1960) and in Avenae (Bullen and Rees, 1972). There are, however, reports of DNA values in allopolyploids amounting to less than the sum of the diploid quantities.…”

Section: Introductionmentioning

confidence: 99%

Nuclear DNA and the evolution of allotetraploid Brassicae

Verma

Rees

1974

Heredity

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SUMMARYDNA amounts, by microdensitometry, are underestimated in nuclei with high DNA density. A method is described for correcting the DNA readings in DNA dense nuclei.DNA measurements in the allotetraploid Brassica nap us (2n = 38), B. carinata (2n = 34) and B. juncea (2n = 36), after applying the correction, were found to equal the sum of the diploid parents from which they are derived. This finding, contrary to previous reports, refutes the evidence for a nuclear DNA diminution subsequent to the formation of the allotetraploids. Interphase nuclei in newly synthesised allotetraploids are substantially larger than in long established allotetraploids. It is suggested that the reduction in nuclear size in tetraploids is associated with greater condensation of chromosome material which, in turn, may reflect an adaptive" switching off" of redundant gene copies in the tetraploid complement.

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Nuclear variation withinAvenae

Cited by 31 publications

References 14 publications

QUANTITATIVE VARIATION OF NUCLEAR DNA IN GENUS <i>AEGILOPS</i>

QUANTITATIVE VARIATION OF NUCLEAR DNA IN GENUS <i>AEGILOPS</i>

Genome size variation in the genus Avena

Nuclear DNA and the evolution of allotetraploid Brassicae

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