Genesis of cells of apical meristems and realization of gametophytic apomixis in flowering plants

Кашин, А. С.

doi:10.1134/s1062360411040059

Cited by 2 publications

(2 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…antarctica populations is maintained by its capacity of vegetative and/or apomictic propagation [ 14 ; 52 ]. It has been shown that apomixis is accompanied with phenomena of poly-, aneu-, and mixoploidy in flowering plants [ 53 , 54 ]. Also, a high level of aneuploidy has been found in plant species propagated asexually [ 55 ].…”

Section: Discussionmentioning

confidence: 99%

Molecular Cytogenetic Analysis of Deschampsia antarctica Desv. (Poaceae), Maritime Antarctic

et al. 2015

View full text Add to dashboard Cite

Deschampsia antarctica Desv. (Poaceae) (2n = 26) is one of the two vascular plants adapted to the harshest environment of the Antarctic. Although the species is a valuable model for study of environmental stress tolerance in plants, its karyotype is still poorly investigated. We firstly conducted a comprehensive molecular cytogenetic analysis of D. antarctica collected on four islands of the Maritime Antarctic. D. antarctica karyotypes were studied by Giemsa C- and DAPI/C-banding, Ag-NOR staining, multicolour fluorescence in situ hybridization with repeated DNA probes (pTa71, pTa794, telomere repeats, pSc119.2, pAs1) and the GAA simple sequence repeat probe. We also performed sequential rapid in situ hybridization with genomic DNA of D. caespitosa. Two chromosome pairs bearing transcriptionally active 45S rDNA loci and five pairs with 5S rDNA sites were detected. A weak intercalary site of telomere repeats was revealed on the largest chromosome in addition to telomere hybridization signals at terminal positions. This fact confirms indirectly the hypothesis that chromosome fusion might have been the cause of the unusual for cereals chromosome number in this species. Based on patterns of distribution of the examined molecular cytogenetic markers, all chromosomes in karyotypes were identified, and chromosome idiograms of D. antarctica were constructed. B chromosomes were found in most karyotypes of plants from Darboux Island. A mixoploid plant with mainly triploid cells bearing a Robertsonian rearrangement was detected among typical diploid specimens from Great Jalour Island. The karyotype variability found in D. antarctica is probably an expression of genome instability induced by environmental stress factors. The differences in C-banding patterns and in chromosome distribution of rDNA loci as well as homologous highly repeated DNA sequences detected between genomes of D. antarctica and its related species D. caespitosa indicate that genome reorganization involving coding and noncoding repeated DNA sequences had occurred during the divergence of these species.

show abstract

Section: Discussionmentioning

confidence: 99%

Molecular Cytogenetic Analysis of Deschampsia antarctica Desv. (Poaceae), Maritime Antarctic

et al. 2015

View full text Add to dashboard Cite

show abstract

“…We focused our analyses on documented cases in animals, but this phenomenon may be widespread in plants. Indeed, hybridogenesis has been observed in plants that undergo genome exclusion after a hybridization event (Kashin ; Dubovets & Sycheva ). The appearance of selfish genetic elements, resulting in meiotic drive, has also been registered in plants (Nasuda et al.…”

Section: Discussionmentioning

confidence: 99%

Effect of hybridization with genome exclusion on extinction risk

Quilodrán

Currat

Montoya‐Burgos

2018

Conservation Biology

View full text Add to dashboard Cite

Human-induced habitat changes may lead to the breakdown of reproductive barriers between distantly related species. This phenomenon may result in fertile first-generation hybrids (F ) that exclude the genome of one parental species during gametogenesis, thus disabling introgression. The species extinction risk associated with hybridization with genome exclusion is largely underappreciated because the phenomenon produces only F hybrid phenotype, leading to the misconception that hybrids are sterile and potentially of minor conservation concern. We used a simulation model that integrates the main genetic, demographic, and ecological processes to examine the dynamics of hybridization with genome exclusion. We showed that this mode of hybridization may lead to extremely rapid extinction when the process of genome exclusion is unbalanced between the interbreeding species and when the hybridization rate is not negligible. The coexistence of parental species was possible in some cases of asymmetrical genome exclusion, but show this equilibrium was highly vulnerable to environmental variation. Expanding the exclusive habitat of the species at risk allowed its persistence. Our results highlight the extent of possible extinction risk due to hybridization with genome exclusion and suggest habitat management as a promising conservation strategy. In anticipation of serious threats to biodiversity due to hybridization with genome exclusion, we recommend a detailed assessment of the reproductive status of hybrids in conservation programs. We suggest such assessments include the inspection of genetic content in hybrid gametes.

show abstract

Genesis of cells of apical meristems and realization of gametophytic apomixis in flowering plants

Cited by 2 publications

References 45 publications

Molecular Cytogenetic Analysis of Deschampsia antarctica Desv. (Poaceae), Maritime Antarctic

Molecular Cytogenetic Analysis of Deschampsia antarctica Desv. (Poaceae), Maritime Antarctic

Effect of hybridization with genome exclusion on extinction risk

Contact Info

Product

Resources

About