scholarly journals Strong population differentiation in lingcod ( Ophiodon elongatus ) is driven by a small portion of the genome

2020 ◽  
Vol 13 (10) ◽  
pp. 2536-2554
Author(s):  
Gary C. Longo ◽  
Laurel Lam ◽  
Bonnie Basnett ◽  
Jameal Samhouri ◽  
Scott Hamilton ◽  
...  
Keyword(s):  
Population Differentiation ◽  
Ophiodon Elongatus

Understanding genetic diversity, structure and population differentiation in selected wild species and cultivated Indian and exotic rose varieties based on microsatellite allele frequencies

2019 ◽  
Vol 79 (3) ◽  
Author(s):  
Aparna . Veluru ◽  
Kanwar P. Singh ◽  
Namita . . ◽  
Sapna . Panwar ◽  
Gayacharan . . ◽  
...  
Keyword(s):  
Wild Species ◽  
Population Differentiation ◽  
Ornamental Plants ◽  
Primary Source ◽  
Mean Value ◽  
Rosa Hybrida ◽  
Population Subdivision ◽  
Nutraceutical Compounds ◽  
Ssr Loci ◽  
Admixture Population

Roses are the most important commercial ornamental plants grown for flowers, perfumery and nutraceutical compounds. Commercially cultivated roses (Rosa × hybrida L.) are complex interspecific hybrids probably derived from 8-10 wild species among the large diversity of 130-200 species in genus Rosa. Wild germplasm is a primary source of variability and plays a major role in improving existing varieties by broadening their genetic base. In the present investigation, we have utilized the previously identified SSR primers for studying the diversity among 148 selected rose genotypes, including wild species and cultivated varieties of Indian and exotic origin. A total of 88 alleles was scored using 30 polymorphic loci; they produced average 2.9±1 alleles per locus. Polymorphism information content (PIC) values for different SSR loci ranged from 0.08 to 0.8 with a mean value of 0.5±0.2. The neighbor-joining tree generated based on Nei’s (1978) genetic distance values grouped the population into three major clusters. Cluster-I and II consists of all modern rose cultivars (Rosa × hybrida L.) originated from India and cluster-III consists of all exotic cultivars, wild species and a few cultivars from India. STRUCTURE analysis based on microsatellite allelic data, partitioned the total rose genotypes into four different sub-populations with some individual genotypes having genomic admixture. Population subdivision estimates, FST between different subpopulations ranged from 0.01-0.15 indicates low to moderate level of divergence existing among the rose cultivars and germplasm. Population differentiation in rose cultivars and wild species corresponds to their geographical origin and lineages. Analysis of molecular variance (AMOVA) results revealed that 83.12 % of the variance was accounted for by within sub-groups followed by significant levels of variation among the populations (10.42%) and least variance (6.46%) was noticed among individuals within groups.

scholarly journals Abundant Mitochondrial Genome Diversity, Population Differentiation and Convergent Evolution in Pines

Genetics ◽  
1998 ◽  
Vol 150 (4) ◽  
pp. 1605-1614
Author(s):  
Junyuan Wu ◽  
Konstantin V Krutovskii ◽  
Steven H Strauss
Keyword(s):  
Mitochondrial Dna ◽  
Population Differentiation ◽  
Mitochondrial Gene ◽  
Dna Polymorphisms ◽  
Neighbor Joining ◽  
Closely Related Species ◽  
Breeding Programs ◽  
Length Polymorphisms ◽  
Polymerase Chain ◽  
Mitochondrial Genome Diversity

Abstract We examined mitochondrial DNA polymorphisms via the analysis of restriction fragment length polymorphisms in three closely related species of pines from western North America: knobcone (Pinus attenuata Lemm.), Monterey (P. radiata D. Don), and bishop (P. muricata D. Don). A total of 343 trees derived from 13 populations were analyzed using 13 homologous mitochondrial gene probes amplified from three species by polymerase chain reaction. Twenty-eight distinct mitochondrial DNA haplotypes were detected and no common haplotypes were found among the species. All three species showed limited variability within populations, but strong differentiation among populations. Based on haplotype frequencies, genetic diversity within populations (HS) averaged 0.22, and population differentiation (GST and θ) exceeded 0.78. Analysis of molecular variance also revealed that >90% of the variation resided among populations. For the purposes of genetic conservation and breeding programs, species and populations could be readily distinguished by unique haplotypes, often using the combination of only a few probes. Neighbor-joining phenograms, however, strongly disagreed with those based on allozymes, chloroplast DNA, and morphological traits. Thus, despite its diagnostic haplotypes, the genome appears to evolve via the rearrangement of multiple, convergent subgenomic domains.

scholarly journals Spatial pattern and genetic diversity estimates are linked in stochastic models of population differentiation

2000 ◽  
Vol 23 (3) ◽  
pp. 541-544 ◽  
Author(s):  
José Alexandre Felizola Diniz-Filho ◽  
Mariana Pires de Campos Telles
Keyword(s):  
Genetic Diversity ◽  
Spatial Pattern ◽  
Stochastic Models ◽  
Population Differentiation ◽  
Real Data ◽  
Population Heterogeneity ◽  
Data Set ◽  
Mantel’S Test ◽  
The Relationship ◽  
Diversity Estimates

In the present study, we used both simulations and real data set analyses to show that, under stochastic processes of population differentiation, the concepts of spatial heterogeneity and spatial pattern overlap. In these processes, the proportion of variation among and within a population (measured by G ST and 1 - G ST, respectively) is correlated with the slope and intercept of a Mantel's test relating genetic and geographic distances. Beyond the conceptual interest, the inspection of the relationship between population heterogeneity and spatial pattern can be used to test departures from stochasticity in the study of population differentiation.

scholarly journals Epigenetic population differentiation in field- and common garden-grownScabiosa columbariaplants

2018 ◽  
Vol 8 (6) ◽  
pp. 3505-3517 ◽  
Author(s):  
Maartje P. Groot ◽  
Niels Wagemaker ◽  
N. Joop Ouborg ◽  
Koen J. F. Verhoeven ◽  
Philippine Vergeer
Keyword(s):  
Population Differentiation ◽  
Common Garden
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