Phylogenetic Relationships of Tetraploid AB-Genome <i>Avena</i> Species Evaluated by Means of Cytogenetic (C-Banding and FISH) and RAPD Analyses

Бадаева, Е. Д.; Shelukhina, O. Yu.; Goryunova, S. V.; Лоскутов, И. Г.; Pukhalskiy, V. A.

doi:10.1155/2010/742307

Cited by 30 publications

(49 citation statements)

References 47 publications

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“…Four recognized species have been proposed to have an AB genome composition. Of these, A. barbata, A. abyssinica and A. vaviloviana are grouped into a biological species known as the barbata group, while A. agadiriana is distinct [25, 42]. Our results confirmed the reported structural differences between these two groups (Fig 3).…”

Section: Discussionsupporting

confidence: 87%

“…Recently, another GBS study [19] showed that the AB genome tetraploid species fell into a tight cluster with A s genome diploids, also supporting the hypothesis that the B genome arose through minor divergence following autoploidization. However, other evidence from C-banding [24], FISH [17], RAPD markers [25], and DNA sequence alignment [14] has indicated a clear distinction between A and B genomes, suggesting an allotetraploid origin of the AB genome tetraploid species. The most probable A genome progenitor of the AB genome tetraploids is assumed to be an A s genome diploid species, while the B genome of these species remains controversial.…”

Section: Introductionmentioning

confidence: 99%

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Phylogenetic relationships in the genus Avena based on the nuclear pgk1 gene

Peng

Zhou

Zhao

et al. 2018

Preprint

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22The phylogenetic relationships among 76 Avena taxa, representing 14 diploids, 23 eight tetraploids, and four hexaploids were investigated by using the nuclear plastid 24 3-phosphoglycerate kinase gene(Pgk1). A significant deletion (131 bp) was detected 25 in all the C genome homoeologues which reconfirmed a major structural divergence 26 between the A and C genomes. Phylogenetic analysis indicated the C p genome is 27 more closely related to the polyploid species than is the C v genome. Two haplotypes 28 of Pgk1 gene were obtained from most of the AB genome tetraploids. Both types of 29 the barbata group showed a close relationship with the A s genome diploid species, 30 supporting the hypothesis that both the A and B genomes are derived from an A s 31 genome. Two haplotypes were also detected in A. agadiriana, which showed close 32 relationships with the A s genome diploid and the A c genome diploid, respectively, 33 emphasizing the important role of the A c genome in the evolution of A. agadiriana. 34 Three homoeologues of thePgk1 gene were detected in five hexaploid accessions. 35 The homoeologues that might represent the D genome were tightly clustered with 36 the tetraploids A. marrocana and A. murphyi, but did not show a close relationship 37 with any extant diploid species. 38 42 [5]. The evolutionary history of Avena species has been discussed for decades, and 43 3 remains a matter of debate despite considerable research effort in this field. 44 Cytologically, three ploidy levels are recognized in the genus Avena: diploid, 45 tetraploid, and hexaploid, with a base number of seven chromosomes [6, 7]. The 46 diploids are divided clearly into two distinct lineages with the A and C genomes. All 47 hexaploid species share the same genomic constitution of ACD, corroborated by 48 fertile interspecific crosses among each other, as well as by their similar genome 49 sizes [8]. With less certainty, the tetraploids have been designated as AB or AA, AC or 50 DC, and CC genomes [9]. It is noteworthy that the B and D genomes within the 51 polyploid species have not been identified in any extant diploid species. There are 52 three C genome diploid species, which have been grouped into two genome types 53

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Section: Discussionsupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Phylogenetic relationships in the genus Avena based on the nuclear pgk1 gene

Peng

Zhou

Zhao

et al. 2018

Preprint

View full text Add to dashboard Cite

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“…Two long‐time proposed evolutionary models can accommodate our results and the accumulated evidence to explain how the constituent subgenomes may have arisen: (i) an autotetraploid origin of the two more similar subgenomes As_2 and As_3 (A/D), and subsequent hybridization with a C genome (Badaeva et al ., ; Ladizinsky, ); and (ii) an allotetraploid formation with two close A genome species and later subgenome divergence (Fu and Williams, ; Ladizinsky, , ). Nevertheless, to date, none of them have been unequivocally substantiated as participating in the formation of the hexaploid species.…”

Section: Discussionmentioning

confidence: 99%

Subgenome‐specific assembly of vitamin E biosynthesis genes and expression patterns during seed development provide insight into the evolution of oat genome

Gutiérrez-González

Garvin²

2016

Plant Biotechnology Journal

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SummaryVitamin E is essential for humans and thus must be a component of a healthy diet. Among the cereal grains, hexaploid oats (Avena sativa L.) have high vitamin E content. To date, no gene sequences in the vitamin E biosynthesis pathway have been reported for oats. Using deep sequencing and orthology‐guided assembly, coding sequences of genes for each step in vitamin E synthesis in oats were reconstructed, including resolution of the sequences of homeologs. Three homeologs, presumably representing each of the three oat subgenomes, were identified for the main steps of the pathway. Partial sequences, likely representing pseudogenes, were recovered in some instances as well. Pairwise comparisons among homeologs revealed that two of the three putative subgenome‐specific homeologs are almost identical for each gene. Synonymous substitution rates indicate the time of divergence of the two more similar subgenomes from the distinct one at 7.9–8.7 MYA, and a divergence between the similar subgenomes from a common ancestor 1.1 MYA. A new proposed evolutionary model for hexaploid oat formation is discussed. Homeolog‐specific gene expression was quantified during oat seed development and compared with vitamin E accumulation. Homeolog expression largely appears to be similar for most of genes; however, for some genes, homoeolog‐specific transcriptional bias was observed. The expression of HPPD, as well as certain homoeologs of VTE2 and VTE4, is highly correlated with seed vitamin E accumulation. Our findings expand our understanding of oat genome evolution and will assist efforts to modify vitamin E content and composition in oats.

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“…In situ hybridization (Jellen et al 1994;Yang et al 1999;Shelukhina et al 2008) also provides evidence for the close relationship between these two species. There is ample evidence that the AABB genome tetraploid species A. barbata, A. abyssinica and A. vaviloviana are autotetraploid derived from the A s A s genome diploid species (Ladizinsky & Johnson 1972;Leggett & Markhand 1995;Katsiotis et al 1997;Loskutov 2008;Badaeva et al 2010). In the present study, these three AABB tetraploid species also showed a close relationship with the A s A s genome diploid species.…”

Section: Relationships Among Avena Speciesmentioning

confidence: 99%

Genetic diversity of seed storage proteins in diploid, tetraploid and hexaploid Avena species

et al. 2014

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Genetic diversities of 106 Avena accessions, including diploid, tetraploid and hexaploid species, derived from different countries were characterized based on seed storage proteins polymorphism using SDS-PAGE. A total of 24 protein bands and 72 protein patterns were detected in all 106 accessions. The genetic similarity value varied from 0.50 to 1.00. The seed storage protein patterns were largely independent of environmental fluctuation. Accessions of the same species or with identical genome constitutions had the same or similar protein patterns. Relatively lower within-species variations were observed compared with among-species variations. The AACCDD genome hexaploid species and the AA genome diploid species were more divergent than other species, with percentages of polymorphic bands of 85.7% and 61.1% respectively. In the AA genome diploid species, the A s A s genome diploids displayed higher variations than the modified AA genome diploid species. Clustering results showed a close relationship between the hexaploid species and the AACC genome tetraploid species. The AABB genome tetraploid species were similar to the A s A s genome diploid species, with the exception of the species A. agadiriana with AABB genome constitution, which showed a close relationship with the A c A c genome diploid species A. canariensis and the polyploid species carrying the A and C genomes.

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Phylogenetic Relationships of Tetraploid AB-Genome Avena Species Evaluated by Means of Cytogenetic (C-Banding and FISH) and RAPD Analyses

Cited by 30 publications

References 47 publications

Phylogenetic relationships in the genus Avena based on the nuclear pgk1 gene

Phylogenetic relationships in the genus Avena based on the nuclear pgk1 gene

Subgenome‐specific assembly of vitamin E biosynthesis genes and expression patterns during seed development provide insight into the evolution of oat genome

Genetic diversity of seed storage proteins in diploid, tetraploid and hexaploid Avena species

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