Genome differentiation in Aegilops . 3. Evolution of the D-genome cluster

Бадаева, Е. Д.; Amosova, Аlexandra V.; Muravenko, Olga V.; Samatadze, Tatiana E.; Chikida, N. N.; Zelenin, A. V.; Friebe, Bernd; Gill, Bikram S.

doi:10.1007/s006060200018

Cited by 92 publications

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“…The Aegilops polyploid complex has a long history of recurrent hybridization (reviewed in [23][24][25]) and presents rapidly evolving genomes with up to 80% of repetitive sequences [26][27][28], making an outstanding system to reveal the role of LTR-RTs in reproductive isolation. Species of the 'D-genome cluster' such as Aegilops cylindrica (genomes DC [29]) and of the 'U-genome cluster' such as Aegilops triuncialis (UC) and Aegilops geniculata (UM [30]) show overlapping distribution fostering natural hybridization across the Mediterranean area and were thus selected here to investigate the interplay between genome dynamics and reproductive isolation. Recent molecular studies deciphered the evolutionary trajectories of LTR-RTs in these genomes [31], formulating clear predictions on the families to be activated by genome shocks in their F 1 hybrids.…”

Section: Introductionmentioning

confidence: 99%

Genome reorganization in F ₁ hybrids uncovers the role of retrotransposons in reproductive isolation

2015

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Interspecific hybridization leads to new interactions among divergent genomes, revealing the nature of genetic incompatibilities having accumulated during and after the origin of species. Conflicts associated with misregulation of transposable elements (TEs) in hybrids expectedly result in their activation and genome-wide changes that may be key to species boundaries. Repetitive genomes of wild wheats have diverged under differential dynamics of specific long terminal repeat retrotransposons (LTR-RTs), offering unparalleled opportunities to address the underpinnings of plant genome reorganization by selfish sequences. Using reciprocal F 1 hybrids between three Aegilops species, restructuring and epigenetic repatterning was assessed at random and LTR-RT sequences with amplified fragment length polymorphism and sequencespecific amplified polymorphisms as well as their methylation-sensitive counterparts, respectively. Asymmetrical reorganization of LTR-RT families predicted to cause conflicting interactions matched differential survival of F 1 hybrids. Consistent with the genome shock model, increasing divergence of merged LTR-RTs yielded higher levels of changes in corresponding genome fractions and lead to repeated reorganization of LTR-RT sequences in F 1 hybrids. Such non-random reorganization of hybrid genomes is coherent with the necessary repression of incompatible TE loci in support of hybrid viability and indicates that TE-driven genomic conflicts may represent an overlooked factor supporting reproductive isolation.

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Section: Introductionmentioning

confidence: 99%

Genome reorganization in F ₁ hybrids uncovers the role of retrotransposons in reproductive isolation

2015

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“…The most frequent is recombination of the homologous D chromosomes and even though the D genome of wheat and A. cylindrica originated from different biotypes of A. tauschii, they pair successfully at meiosis forming 14 bivalents Badaeva et al 2002). The second method is through intergenomic translocations or chromosome rearrangements.…”

Section: Hybridization With Aegilops Cylindricamentioning

confidence: 99%

The biology and ecology of hexaploid wheat (Triticum aestivum L.) and its implications for trait confinement

Willenborg¹,

Acker²

2008

Can. J. Plant Sci.

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Willenborg, C. J. and Van Acker, R. C. 2008. The biology and ecology of hexaploid wheat (Triticum aestivum L.) and its implications for trait confinement. Can. J. Plant Sci. 88: 997Á1013. This review summarizes the biological and ecological factors of hexaploid wheat (Triticum aestivum L.) that contribute to trait movement including the ability to volunteer, germination and establishment characteristics, breeding system, pollen movement, and hybridization potential. Although wheat has a short-lived seedbank with a wide range of temperature and moisture requirements for germination and no evidence of secondary dormancy, volunteer wheat populations are increasing in relative abundance and some level of seed persistence in the soil has been observed. Hexaploid wheat is predominantly self-pollinating with cleistogamous flowers and pollen viability under optimal conditions of only 0.5 h, yet observations indicate that pollen-mediated gene flow can and will occur at distances up to 3 km and is highly dependent on prevailing wind patterns. Hybridization with wild relatives such as A. cylindrica Host., Secale cereale L., and Triticum turgidum L. is a serious concern in regions where these species grow in field margins and unmanaged lands, regardless of which genome the transgene is located on. More research is needed to determine the long-term population dynamics of volunteer wheat populations before conclusions can be drawn with regard to their role in trait movement. Seed movement has the potential to create adventitious presence (AP) on a larger scale than pollen, and studies tracing the movement of wheat seed in the grain handling system are needed. Finally, the development of mechanistic models that predict landscape-level trait movement are required to identify transgene escape routes and critical points for gene containment in various cropping systems. ) qui concourent au flux de certains caracte`res, dont la repousse spontane´e, la germination et les parame`tres de l'implantation, le syste`me de reproduction, le de´placement du pollen et le potentiel d'hybridation. Bien que les semences du ble´n'aient pas une grande longe´vite´et que leur germination soit lie´e a`maintes contraintes thermiques et hydriques, sans e´vidence de dormance secondaire, les peuplements a`re´ge´ne´ration naturelle sont de plus en plus nombreux et on note une certaine persistance des semences dans le sol. Le ble´hexaploı¨de est essentiellement autogame; ses fleurs sont cle´istogames et, dans les conditions optimales, le pollen n'est viable que 0,5 h. Pourtant, des observations indiquent que le pollen est responsable d'un flux ge´ne´tique jusqu'a`une distance de 3 km, mais que le phe´nome`ne de´pend fortement de la direction des vents dominants. L'hybridation avec des espe`ces sauvages apparente´es telles A. cylindrica Host., Secale cereale L. et Triticum turgidum L. est tre`s pre´occupante dans les re´gions ou`ces espe`ces poussent a`la lisie`re des champs et dans les terres incultes, peu importe le ge´nome portant le transge`ne. Il faudr...

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“…The significant role of polyploidy in the evolution of Triticum and Aegilops complex is well established (Badaeva et al, 2002;Zhang et al, 2002). The species that donated the A and D genomes to cultivated wheat have now been identified as T. urartu (AA) and Ae.…”

Section: Satellite Dna Families In Hybrid Polyploidsmentioning

confidence: 99%

“…tauschii and that of hexaploid wheat. It indicated that the D genome of wheat shares perfect homology with its ancestral genome (Badaeva et al, 2002).…”

Section: Satellite Dna Families In Hybrid Polyploidsmentioning

confidence: 99%

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Organization and evolution of highly repeated satellite DNA sequences in plant chromosomes

Sharma

Raina²

2005

Cytogenet Genome Res

108

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A major component of the plant nuclear genome is constituted by different classes of repetitive DNA sequences. The structural, functional and evolutionary aspects of the satellite repetitive DNA families, and their organization in the chromosomes is reviewed. The tandem satellite DNA sequences exhibit characteristic chromosomal locations, usually at subtelomeric and centromeric regions. The repetitive DNA family(ies) may be widely distributed in a taxonomic family or a genus, or may be specific for a species, genome or even a chromosome. They may acquire large-scale variations in their sequence and copy number over an evolutionary time-scale. These features have formed the basis of extensive utilization of repetitive sequences for taxonomic and phylogenetic studies. Hybrid polyploids have especially proven to be excellent models for studying the evolution of repetitive DNA sequences. Recent studies explicitly show that some repetitive DNA families localized at the telomeres and centromeres have acquired important structural and functional significance. The repetitive elements are under different evolutionary constraints as compared to the genes. Satellite DNA families are thought to arise de novo as a consequence of molecular mechanisms such as unequal crossing over, rolling circle amplification, replication slippage and mutation that constitute “molecular drive”.

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Genome differentiation in Aegilops . 3. Evolution of the D-genome cluster

Cited by 92 publications

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Genome reorganization in F ₁ hybrids uncovers the role of retrotransposons in reproductive isolation

Genome reorganization in F ₁ hybrids uncovers the role of retrotransposons in reproductive isolation

The biology and ecology of hexaploid wheat (Triticum aestivum L.) and its implications for trait confinement

Organization and evolution of highly repeated satellite DNA sequences in plant chromosomes

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Genome differentiation in Aegilops . 3. Evolution of the D-genome cluster

Cited by 92 publications

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Genome reorganization in F 1 hybrids uncovers the role of retrotransposons in reproductive isolation

Genome reorganization in F 1 hybrids uncovers the role of retrotransposons in reproductive isolation

The biology and ecology of hexaploid wheat (Triticum aestivum L.) and its implications for trait confinement

Organization and evolution of highly repeated satellite DNA sequences in plant chromosomes

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Product

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Genome reorganization in F ₁ hybrids uncovers the role of retrotransposons in reproductive isolation

Genome reorganization in F ₁ hybrids uncovers the role of retrotransposons in reproductive isolation