2022
DOI: 10.1038/s41588-022-01127-7
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Reference genome assemblies reveal the origin and evolution of allohexaploid oat

Abstract: Common oat (Avena sativa) is an important cereal crop serving as a valuable source of forage and human food. Although reference genomes of many important crops have been generated, such work in oat has lagged behind, primarily owing to its large, repeat-rich polyploid genome. Here, using Oxford Nanopore ultralong sequencing and Hi-C technologies, we have generated a reference-quality genome assembly of hulless common oat, comprising 21 pseudomolecules with a total length of 10.76 Gb and contig N50 of 75.27 Mb.… Show more

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Cited by 79 publications
(99 citation statements)
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“…Whole genome multiplication and subsequent diploidization processes provide plants with increased allelic diversity, heterozygosity, and enhanced meiotic recombination, which may increase their adaptive plasticity and evolutionary success [ 89 ]. It is, therefore, not surprising that the domestication of some of the most economically important cultivated plants is associated with a polyploidization event, e.g., Avena sativa [ 90 ], Triticum sp. [ 91 ], Ipomoea batatas [ 92 ], Brassica rapa [ 93 ], and Musa sp.…”
Section: Resultsmentioning
confidence: 99%
“…Whole genome multiplication and subsequent diploidization processes provide plants with increased allelic diversity, heterozygosity, and enhanced meiotic recombination, which may increase their adaptive plasticity and evolutionary success [ 89 ]. It is, therefore, not surprising that the domestication of some of the most economically important cultivated plants is associated with a polyploidization event, e.g., Avena sativa [ 90 ], Triticum sp. [ 91 ], Ipomoea batatas [ 92 ], Brassica rapa [ 93 ], and Musa sp.…”
Section: Resultsmentioning
confidence: 99%
“…Every duplication or doubling of the genome will leave indelible traces (such as loss, transfer, and recombination) on the chromosomes. For example, the tetraploid ancestors of oat were hexaploidized, with large segments of chromosome 6D splitting into different chromosomes and only a portion of the hexaploid chromosome remaining [ 57 ]. In this study, the distribution of the AsWRKY gene on each chromosome was lowest in chromosome 6D ( AsWRKY146 and AsWRKY147 ).…”
Section: Discussionmentioning
confidence: 99%
“…KaKs_Calculator 2.0 ( , accessed on 3 March 2022)was used to calculate non-synonymous (Ka) and synonymous (Ks) substitutions for each duplicated gene pair [ 56 ]. Based on 2.6 × 10 −9 substitution/synonymous site in oat [ 57 ], the approximate date of the repeat event (million years ago, Mya) was estimated using the formula T = Ks/2λ × 10 −6 .…”
Section: Methodsmentioning
confidence: 99%
“…The assembly of hexaploid (AACCDD) oat reference genome sequences (Maughan et al, 2019;Kamal et al, 2022;Peng et al, 2022) now allows direct comparisons between the physical position of candidate phenology genes and the locations of genetic markers linked to variation in flowering behaviour. These comparisons support the idea that VRN1 and FT1 are likely to underlie variation in oat phenology, with VRN1 homeoalleles on chromosomes 4D, 7A and 7D, and FT1 homeoallele on 7A all linked to phenological variation (Tinker et al, 2022).…”
Section: Genes That Drive Variation In Oat Phenologymentioning
confidence: 99%