The evolutionary significance of ancient genome duplications
- BiologyNature Reviews Genetics
It is argued that ancient genome doublings could probably have survived only under very specific conditions, but that, whenever established, they might have had a pronounced impact on species diversification, and led to an increase in biological complexity and the origin of evolutionary novelties.
Genomic evolution in polyploid vertebrates: Models and progress in research techniques
- BiologySCIENTIA SINICA Vitae
This work reviews the development of theories in WGD studies, summarizes the research models and progress in vertebrates, and discusses the challenges of “omics” research and effective technical strategies to discover feasible means of unravelling the genome evolution of polyploid vertebrates.
Polyploidy, the Nucleotype, and Novelty: The Impact of Genome Doubling on the Biology of the Cell
- BiologyInternational Journal of Plant Sciences
This work updates the old but still relevant concept of polyploidy, focusing on what current knowledge from cell biology can elucidate about how quantitative differences between diploids and isogenic autopolyploids could lead to phenotypic differences.
Polyploid Formation Shapes Flowering Plant Diversity
- BiologyThe American Naturalist
The widely held hypothesis that polyploid flowering plants generate more diversity than their diploid counterparts is examined, by fitting stochastic birth/death models to observed ploidal frequency data from 60 extant angiosperm genera and results suggest the opposite.
Is post-polyploidization diploidization the key to the evolutionary success of angiosperms?
It is argued here that it is the diploidsization process that is responsible for the ‘lag phase’ between polyploidization events and lineage diversification, and has therefore made a significant contribution to the evolutionary success of flowering plants.
An examination of nucleotypic effects in diploid and polyploid cotton
- BiologyAoB PLANTS
The relationship between genome size and cell size in diploid and polyploid cotton plants is outlined, reinforcing previous observations that larger genomes correlate with larger cells in plants.
Rise and Persistence of Animal Polyploidy: Evolutionary Constraints and Potential
- BiologyCytogenetic and Genome Research
It is shown that in most animal asexual complexes clonal lineages may become established only under one ploidy level (usually either di- or triploidy), and that it is rather rare to see the coexistence of successful clones of different ploidies.
Polyploidy and interspecific hybridization: partners for adaptation, speciation and evolution in plants
- BiologyAnnals of botany
Polyploidy results in immediate genetic redundancy and represents, with the emergence of new gene functions, an important source of novelty in plant evolution, and is illustrated by the huge angiosperm diversity that is assumed to originate from recurrent polyploidization events.
The “Polyploid Hop”: Shifting Challenges and Opportunities Over the Evolutionary Lifespan of Genome Duplications
- BiologyFront. Ecol. Evol.
Evidence suggests that if early barriers are overcome, WGD can offer instantaneous fitness advantages opening the way to a transformed fitness landscape by sampling a higher diversity of alleles, including some already preadapted to their local environment.
Genomic Analysis of the Allotetraploid Frog, Xenopus laevis - eScholarship
The discovery of asymmetrically distributed transposon subfamilies supports the model that cross-species hybridization through allotetraploidy is the mechanism underlying the polyploid Xenopus radiation.
SHOWING 1-10 OF 116 REFERENCES
ON THE ABUNDANCE OF POLYPLOIDS IN FLOWERING PLANTS
- BiologyEvolution; international journal of organic evolution
It is shown that average ploidal level within a plant lineage can continually increase to the levels observed today, even if there are ecological or physiological disadvantages to higher ploidy.
Novel patterns of gene expression in polyploid plants.
- BiologyTrends in genetics : TIG
Polyploidy and Novelty in Flowering Plants
- BiologyThe American Naturalist
Evidence is presented herein from biochemical, physiological, developmental, and genetical sources which indicates that the nucleotypic effects of chromosome doubling are not necessarily negative, and indeed chromosome doubling may "propel" a population in to a new adaptive sphere, and render it capable of occupying habitats beyond the limits of its diploid progenitor.
An Evolutionary Advantage of Haploidy in Large Yeast Populations
This work tested model predictions regarding rates of adaptation using asexual yeast populations and found that diploidy slowed adaptation by large populations but not by small populations.
Polyploid incidence and evolution.
- BiologyAnnual review of genetics
New estimates for the incidence of polyploidy in ferns and flowering plants are presented based on a simple model describing transitions between odd and even base chromosome numbers, and it is indicated that ploidy changes may represent from 2 to 4% of speciation events in flowering plants and 7% in f Ferns.
The evolution of the genome
This chapter discusses the evolution of genome size in animals and plants, as well as Comparative Genomics in Eukaryotes and Prokaryotes, and macroevolution and the Genome.
Genome evolution in polyploids
- BiologyPlant Molecular Biology
Processes and mechanisms of gene and genome evolution in polyploids are reviewed, including the role of transposable elements in structural and regulatory gene evolution; processes and significance of epigenetic silencing; underlying controls of chromosome pairing and mechanisms and functional significance of rapid genome changes are reviewed.
Stomatal Size in Fossil Plants : Evidence for Polyploidy in Majority of Angiosperms
- Biology, Environmental Science
Estimating the genome size of extinct woody angiosperms with the use of fossil guard cell size as a proxy for cellular DNA content suggested that seven to nine is the primitive haploid chromosome number of angios perms and that most angiosPerms (approximately 70 percent) have polyploidy in their history.
NEOPOLYPLOIDY IN FLOWERING PLANTS
The fertility of early generation polyploids increases rapidly, owing largely to selection against meiotic configurations that generate unbala..., casting doubt on the paradigm that allopolyploids should be more frequent due to their inherent fertility.
Aneuploidy and Genetic Variation in the Arabidopsis thaliana Triploid Response
- Biology, MedicineGenetics
It is demonstrated that triploids of A. thaliana are fertile, producing a swarm of different aneuploids, and can readily form tetraploids and function as bridges between euploid types.