scholarly journals Genetic Variation and Population Structure of the White Rhinoceros

2012 ◽  
Vol 11 (2) ◽  
pp. 241-244
Author(s):  
Guanyu Hou ◽  
Hongpu Zeng ◽  
Dongjin Wang ◽  
Hanlin Zhou
Keyword(s):  
Population Structure ◽  
Genetic Variation ◽  
White Rhinoceros

Genetic variation and population structure of Rosa roxburghii by EST-based and genomic SSR markers

2020 ◽  
Vol 52 (4) ◽  
Author(s):  
Min Lu ◽  
Huaishan Zhang ◽  
Huaming An ◽  
Wen Zhou
Keyword(s):  
Population Structure ◽  
Genetic Variation ◽  
Ssr Markers ◽  
Genomic Ssr ◽  
Rosa Roxburghii

Genetic variation and population structure in Korean endemic species: III.Hosta minor (Liliaceae)

1994 ◽  
Vol 107 (4) ◽  
pp. 377-383 ◽  
Author(s):  
Myong Gi Chung
Keyword(s):  
Population Structure ◽  
Genetic Variation ◽  
Endemic Species

Genetic Variation and Population Structure of Oriental Migratory Locust, Locusta migratoria manilensis, in China by Allozyme, SSRP-PCR, and AFLP Markers

2006 ◽  
Vol 44 (7-8) ◽  
pp. 332-346 ◽  
Author(s):  
Xianyun Zheng ◽  
Yang Zhong ◽  
Yihao Duan ◽  
Chunxuan Li ◽  
Li Dang ◽  
...  
Keyword(s):  
Population Structure ◽  
Genetic Variation ◽  
Locusta Migratoria ◽  
Aflp Markers ◽  
Migratory Locust ◽  
Locusta Migratoria Manilensis

Genetic Variation and Population Structure in a Eurasian Collection of Isatis tinctoria L.

2006 ◽  
Vol 54 (3) ◽  
pp. 573-584 ◽  
Author(s):  
Giorgia Spataro ◽  
Paola Taviani ◽  
Valeria Negri
Keyword(s):  
Population Structure ◽  
Genetic Variation ◽  
Isatis Tinctoria

Genetic variation, population structure, and differentiation in scots pine (Pinus sylvestris L.) from the northeast of the Russian plain as inferred from the molecular genetic analysis data

2015 ◽  
Vol 51 (12) ◽  
pp. 1213-1220 ◽  
Author(s):  
A. I. Vidyakin ◽  
S. V. Boronnikova ◽  
Yu. S. Nechayeva ◽  
Ya. V. Pryshnivskaya ◽  
I. V. Boboshina
Keyword(s):  
Population Structure ◽  
Genetic Variation ◽  
Genetic Analysis ◽  
Pinus Sylvestris ◽  
Scots Pine ◽  
Molecular Genetic ◽  
Analysis Data ◽  
Molecular Genetic Analysis ◽  
Russian Plain

scholarly journals Determining Whether Geographic Origin and Potato Genotypes Shape the Population Structure of Phytophthora infestans in the Central Region of Colombia

2019 ◽  
Vol 109 (1) ◽  
pp. 145-154
Author(s):  
Sandra Catalina Chaves ◽  
María Camila Rodríguez ◽  
María Fernanda Mideros ◽  
Florencia Lucca ◽  
Carlos E. Ñústez ◽  
...  
Keyword(s):  
Population Structure ◽  
Genetic Variation ◽  
Phytophthora Infestans ◽  
Central Region ◽  
Geographic Origin ◽  
Geographic Area ◽  
Potato Cultivars ◽  
Clonal Lineage ◽  
Host Genotype ◽  
Genetic Population

Pathogen variation plays an important role in the dynamics of infectious diseases. In this study, the genetic variation of 279 Phytophthora infestans isolates was assessed using a combination of 12 microsatellite simple-sequence repeat markers. Isolates were collected from 11 different potato cultivars in 11 different geographic localities of the central region of Colombia. The objective of this study was to determine whether populations were differentiated by host genotype or geographic origin. Within a single clonal lineage, EC-1, 76 genotypes were detected. An analysis of molecular variance attributed most of the variation to differences within host genotypes rather than among the host genotypes, suggesting that host cultivars do not structure the populations of the pathogen. Furthermore, the lack of a genetic population structure according to the host cultivar was confirmed by all of the analyses, including the Bayesian clustering analysis and the minimum spanning network that used the Bruvo genetic distance, which suggested that there are no significant barriers to gene flow for P. infestans among potato cultivars. According to the geographic origin, the populations of P. infestans were also not structured, and most of the variation among the isolates was attributed to differences within localities. Only some but not all localities in the north and west of the central region of Colombia showed some genetic differentiation from the other regions. The absence of sexual reproduction of this pathogen in Colombia was also demonstrated. Important insights are discussed regarding the genetic population dynamics of the P. infestans populations of the central region of Colombia that were provided by the results. In Colombia, there is a high genetic variation within the EC-1 clonal lineage with closely related genotypes, none dominant, that coexist in a wide geographic area and on several potato cultivars.

scholarly journals A spectral theory for Wright’s inbreeding coefficients and related quantities

PLoS Genetics ◽  
2021 ◽  
Vol 17 (7) ◽  
pp. e1009665
Author(s):  
Olivier François ◽  
Clément Gain
Keyword(s):  
Population Structure ◽  
Genetic Variation ◽  
Population Genetic ◽  
Principal Component ◽  
Large Data ◽  
Population Subdivision ◽  
Adaptive Genetic Variation ◽  
Genomic Locus ◽  
Inbreeding Coefficients ◽  
Definition Of

Wright’s inbreeding coefficient, FST, is a fundamental measure in population genetics. Assuming a predefined population subdivision, this statistic is classically used to evaluate population structure at a given genomic locus. With large numbers of loci, unsupervised approaches such as principal component analysis (PCA) have, however, become prominent in recent analyses of population structure. In this study, we describe the relationships between Wright’s inbreeding coefficients and PCA for a model of K discrete populations. Our theory provides an equivalent definition of FST based on the decomposition of the genotype matrix into between and within-population matrices. The average value of Wright’s FST over all loci included in the genotype matrix can be obtained from the PCA of the between-population matrix. Assuming that a separation condition is fulfilled and for reasonably large data sets, this value of FST approximates the proportion of genetic variation explained by the first (K − 1) principal components accurately. The new definition of FST is useful for computing inbreeding coefficients from surrogate genotypes, for example, obtained after correction of experimental artifacts or after removing adaptive genetic variation associated with environmental variables. The relationships between inbreeding coefficients and the spectrum of the genotype matrix not only allow interpretations of PCA results in terms of population genetic concepts but extend those concepts to population genetic analyses accounting for temporal, geographical and environmental contexts.

scholarly journals The genetic diversity and population structure of two endemic Amazonian quillwort (Isoetes L.) species

PeerJ ◽  
2020 ◽  
Vol 8 ◽  
pp. e10274 ◽  
Author(s):  
Mirella Pupo Santos ◽  
João V.S. Rabelo Araujo ◽  
Arthur V. Sant’anna Lopes ◽  
Julio Cesar Fiorio Vettorazzi ◽  
Marcela Santana Bastos Boechat ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Population Structure ◽  
Genetic Variation ◽  
Geographical Location ◽  
Inter Simple Sequence Repeat ◽  
Shannon Index ◽  
Conservation Strategies ◽  
Amazon Forest ◽  
Mass Extinctions ◽  
Effective Conservation

Background Two endemic lycophyte species Isoetes cangae and Isoetes serracarajensis have been recently described in the State of Pará in the Amazon forest located in northern Brazil. Isoetes L. has survived through three mass extinctions. Plants are considered small-sized, heterosporous, and can display a great diversity of physiological adaptations to different environments. Thus, the current study aimed to estimate the genetic variation of the populations of I. cangae and I. serracarajensis to generate information about their different mechanisms for survival at the same geographical location that could point to different reproductive, adaptative and dispersal strategies and should be considered for effective conservation strategies. Methods The genetic diversity and population structure of I. cangae and I. serracarajensis were investigated using Inter Simple Sequence Repeat (ISSR) molecular markers. Total genomic DNA was isolated, and the genetic diversity parameters were calculated. Results The sixteen primers produced 115 reproducible bands, 87% of which were polymorphic. A high level of polymorphic loci (81.74% and 68.48%) and a high Shannon index (Sh = 0.376 and 0.289) were observed for I. cangae and I. serracarajensis, respectively. The coefficient of genetic differentiation between population areas (GST) showed a higher value in I. serracarajensis (0.5440). Gene flow was higher in I. cangae (1.715) and lower in I. serracarajensis populations (0.419). Overall, the results further show that I. serracarajensis and I. cangae are two species with considerable genetic variation and that these differences may reflect their habitats and modes of reproduction. These results should be considered in the development of effective conservation strategies for both species.

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