Genome size variation in the genus Avena.

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.

journal_name

Genome

journal_title

Genome

authors

Yan H,Martin SL,Bekele WA,Latta RG,Diederichsen A,Peng Y,Tinker NA

doi

10.1139/gen-2015-0132

subject

Has Abstract

pub_date

2016-03-01 00:00:00

pages

209-20

issue

3

eissn

0831-2796

issn

1480-3321

journal_volume

59

pub_type

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