scholarly journals Fragmentación y expansión demográfica en las poblaciones mexicanas de Pinus ayacahuite var. ayacahuite

2017 ◽  
pp. 25
Author(s):  
Alejandra Ortíz-Medrano ◽  
Alejandra Moreno-Letelier ◽  
Daniel Piñero
Keyword(s):  
Genetic Diversity ◽  
Spatial Analysis ◽  
Cold Period ◽  
Early Pleistocene ◽  
Phylogeographic Structure ◽  
Chloroplast Microsatellites ◽  
Nested Clade Analysis ◽  
Analysis Of Molecular Variance ◽  
Molecular Variance ◽  
Mexican Populations

This study explores the phylogeographic structure and the demographic hi story of the Mexican populations of Pinus ayacahuite var. ayacahuite. Three chloroplast microsatellites were amplified in 198 individuals from 14 populations. Twelve haplotypes were found and an average genetic diversity (He) of 0.705. Two maximally differentiated groups were determined with a spatial analysis of molecular variance. A significant correlation was detected between the genetic and geographic distances between these two groups, but not within them. A significant phylogeographic structure was found, produced by the existence of the two groups. Two demographic expansions were detected, the first in the entire species, the second only in the southernmost populations. Additionally, a nested clade analysis was pe1formed to complement our observations. The results showed that the Tehuantepec Isthmus was a corridor for species of temperate affinities in a cold period in early Pleistocene, and later acted as a barrier

scholarly journals Genetic diversity in natural populations of Buriti (Mauritia flexuosa L. f.)

2011 ◽  
Vol 11 (3) ◽  
pp. 216-223 ◽  
Author(s):  
Liene Rocha Picanço Gomes ◽  
Maria Teresa Gomes Lopes ◽  
Jania Lilia da Silva Bentes ◽  
Willian Silva Barros ◽  
Pedro de Queiroz Costa Neto ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Length Polymorphism ◽  
Fragment Length Polymorphism ◽  
Natural Populations ◽  
Analysis Of Molecular Variance ◽  
Molecular Variance ◽  
Polymorphic Loci ◽  
Mauritia Flexuosa ◽  
Geographical Distances ◽  
Traditional Communities

This study aimed to characterize the genetic diversity of buriti populations by AFLP (Amplified Fragment Length Polymorphism) markers. The analysis was performed in four populations used by traditional communities in the state of Amazonia (Bom Jesus do Anamã, Lauro Sodré, Santa Luzia do Buiçuzinho, and Esperança II). From each population 30 plants were randomly selected. To obtain the markers four primer combinations were used. The percentage of polymorphic loci was estimated, the molecular variance among and within populations analyzed and a dendrogram constructed. The primers detected 339 polymorphic loci ranging from 81.1 % to 91.1 % among populations. Analysis of molecular variance attributed 77.18 % to variation within and 22.8 % to variation between populations. The dendrogram indicated the formation of two groups, showing that the populations of Bom Jesus do Anamã and Lauro Sodré are genetically most similar and thet the genetic and geographical distances are not correlated.

scholarly journals GENETIC DIVERSITY AMONG NATURAL POPULATIONS OF Keteleeria evelyniana Mast. IN CENTRAL HIGLANDS OF VIETNAM USING SSR MARKERS

2018 ◽  
Vol 56 (3) ◽  
pp. 275
Author(s):  
Tran Thi Lieu ◽  
Dinh Thi Phong ◽  
Vu Thi Thu Hien
Keyword(s):  
Genetic Diversity ◽  
Genetic Variation ◽  
Genetic Similarity ◽  
Natural Populations ◽  
Similarity Coefficient ◽  
Similarity Matrix ◽  
Analysis Of Molecular Variance ◽  
Molecular Variance ◽  
Private Alleles ◽  
Softwood Species

Keteleeria evelyniana Mast. is a big softwood species with high economic values. Therefore, the number of these trees are rapidly decreasing due to rampant exploitation as well as its habitat loss and recently, the species is considered vulnerablein Vietnam. In this study, we assessed the genetic variation among seventy K. evelyniana samples of three natural populations in Lam Dong, Dak Lak and Kon Tum using 16 microsatellite markers. The results showed that thirteen markers were polymorphic. A total 39 DNA fragments were amplified, among them, thirty – five were polymorphic (accounting for 89.74%). Among studied populations, the level of genetic diversity at Lam Dong (Na = 2.063; Ne = 1.730; Ap = 0.375; I = 0.558; Ho = 0.459 and He = 0.367) was the highest. Analysis of molecular variance (AMOVA) showed that the total level of molecular changes between populations was 34.65% and between individuals in the same population was 65.35%. Private alleles (Ap) and inbreeding values (Fis) of K. evelyniana species were founded of all three populations in Lam Dong, Dak Lak and Kon Tum (0.375 and -0.234; 0.188 and -0.065; 0.063 and -0.047, respectively). The gene flow (Nm) also occurred among the K. evelyniana populations with the average of Nm = 5.423. A dendrogram (UPGMA) constructed based on the similarity matrix of 70 K. evelyniana samples divided into two main groups with their genetic similarity coefficient ranged from 76.5% (Ke26 and Ke44) to 99% (Ke23 and Ke25). The obtained results indicated the importance of conserving the genetic resources of K. evelyniana species in Tay Nguyen.

Preliminary Investigation of Genetic Variation within and between Cultivated and Natural Populations of Banksia coccinea and Banksia menziesii

1998 ◽  
Vol 46 (4) ◽  
pp. 547 ◽  
Author(s):  
M. A. Rieger ◽  
M. Sedgley
Keyword(s):  
Genetic Diversity ◽  
Genetic Variation ◽  
Full Range ◽  
Preliminary Investigation ◽  
Natural Populations ◽  
South Australia ◽  
Randomly Amplified Polymorphic Dna ◽  
Analysis Of Molecular Variance ◽  
Molecular Variance ◽  
Cultivated Populations

The randomly amplified polymorphic DNA (RAPD) technique followed by analysis of molecular variance (AMOVA) was used to determine the level of variation within and between commercial plantations of Banksia coccinea R.Br. and B. menziesii R.Br. in South Australia and natural populations in Western Australia. For B. coccinea, the majority of variation was within populations (66.1%), while between all populations accounted for 20.8%. The variation between cultivated and natural populations was 13.2%. There was close clustering between the cultivated populations, which appeared to be most closely related to the inland natural populations. In contrast, the variation between cultivated and natural populations for B. menziesii was 0.4% with the majority of the variation within populations (93.2%) and 6.4% between all populations. The cultivated and natural populations formed a single cohesive cluster. These data indicate that the full range of natural genetic diversity of B. menziesii appears to occur in the cultivated plantations, but this was not the case for B. coccinea.

Population structure of Moniliophthora perniciosa in the main cacao producing departments of Colombia

Plant Disease ◽  
2021 ◽  
Author(s):  
Yeirme Jaimes ◽  
Carolina Gonzalez ◽  
Jairo Rojas ◽  
Jessica Johana Rivera ◽  
Christian Cilas ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Population Structure ◽  
Geographic Origin ◽  
Genetic Change ◽  
Linkage Disequilibrium Analysis ◽  
Host Genotype ◽  
Dispersal Patterns ◽  
Moniliophthora Perniciosa ◽  
Analysis Of Molecular Variance ◽  
Molecular Variance

The witches’ broom (Moniliophthora perniciosa) is considered as one of the main threats for cacao production and, consequently, for chocolate production worldwide.. In this work, the genetic diversity and population structure of M. perniciosa were analyzed for 59 isolates collected in five departments of Colombia and using 10 microsatellite markers. Analyses revealed 35 multilocus genotypes (MLGs) and clonal populations structure according to linkage disequilibrium analysis. One of the objectives of this study was to determine whether populations were differentiated by geographic origin or T. cacao host genotype. Analysis of molecular variance, Discriminant Analysis of Principal Components (DAPC) and Bruvo genetic distance suggested that the genetic structure was driven by geographic origin and not by T. cacao genotype. The results of this study were consistent with previous findings obtained in other cocoa producing countries. Important insights were discussed regarding the dispersal patterns of the pathogen in Colombia and the genetic change of its populations due to different environmental conditions.

scholarly journals Genetic variation among Iranian alfalfa (Medicago sativa L.) populations based on RAPD markers

2011 ◽  
Vol 18 (2) ◽  
pp. 93-104 ◽  
Author(s):  
Fatemeh Mohammadzadeh ◽  
Hassan Monirifar ◽  
Jalal Saba ◽  
Mostafa Valizadeh ◽  
Ahmad Razban Haghighi ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Cluster Analysis ◽  
Genetic Variation ◽  
Breeding Population ◽  
Genetic Distances ◽  
Analysis Of Molecular Variance ◽  
Molecular Variance ◽  
Geographical Patterns ◽  
Plant Taxon ◽  
High Level

Genetic diversity among and within 10 populations of Iranian alfalfa, from different areas of Azarbaijan, Iran was analyzed by screening DNA from seeds of individual plants and bulk samples. In individual study, 10 randomly amplified polymorphic DNA (RAPD) primers produced 156 polymorphic bands and a high level of genetic diversity was observed within populations. The averages of total and within population genetic diversity were 0.2349 and 0.1892, respectively. Results of analysis of molecular variance (AMOVA) showed the great genetic variation existed within populations (81.37%). These Results were in agreement with allogamous and polyploid nature of alfalfa. Cluster analysis was performed based on Nei’s genetic distances resulting in grouping into 3 clusters which could separate breeding population from other populations. Results of cluster analysis were in consistent with morphological and geographical patterns of populations. The results of bulk method were different from individual analysis. Our results showed that RAPD analysis is a suitable method to study genetic diversity and relationships among alfalfa populations.Keywords: Alfalfa; RAPD; Genetic diversity; Analysis of Molecular Variance; Cluster analysis.DOI: http://dx.doi.org/10.3329/bjpt.v18i2.9296Bangladesh J. Plant Taxon. 18: (2): 93-104, 2011 (December)

scholarly journals Genetic Diversity in Populations of Phytophthora citricola Associated with Horticultural Crops in California

Plant Disease ◽  
2007 ◽  
Vol 91 (12) ◽  
pp. 1556-1563 ◽  
Author(s):  
R. G. Bhat ◽  
G. T. Browne
Keyword(s):  
Genetic Diversity ◽  
Fragment Length Polymorphism ◽  
Group Method ◽  
Aflp Data ◽  
Analysis Of Molecular Variance ◽  
Molecular Variance ◽  
Horticultural Crops ◽  
Pair Group ◽  
Phytophthora Citricola ◽  
High Level

California populations of the plant pathogen Phytophthora citricola were examined for amplified fragment length polymorphism (AFLP), pathogenicity on almond, and sensitivity to mefenoxam. The characterizations of AFLP variation and mefenoxam sensitivity were based on 86 isolates (44 from almond, 11 from avocado, 3 from strawberry, 18 from walnut, and 10 from six other hosts). Cluster analysis of the AFLP data using the unweighted pair group method indicated a high level of genetic diversity among the isolates, and four main clusters were identified—one dominated by isolates from almond, another including all isolates from avocado, and two including isolates from several hosts other than avocado. Analysis of molecular variance revealed that 38.4 and 24.9% of the AFLP variation were associated with host and geographical factors, respectively. Of 24 isolates, including those from almond, avocado, strawberry, and walnut, 22 were aggressive on almond shoots; there was no evidence of host specificity. All but 1 of the 86 isolates grew at different rates on V8 juice medium amended with mefenoxam at 1 ppm, indicating partial tolerance to the fungicide. Isolates of P. citricola from California populations are genetically diverse, and much of the variation is associated with host and geography. These populations are all potentially pathogenic on almond and tolerant to mefenoxam.

scholarly journals Genetic Diversity and Dynamics of Sinorhizobium meliloti Populations Nodulating Different Alfalfa Cultivars in Italian Soils

2000 ◽  
Vol 66 (11) ◽  
pp. 4785-4789 ◽  
Author(s):  
Maria Carelli ◽  
Stefano Gnocchi ◽  
Silvia Fancelli ◽  
Alessio Mengoni ◽  
Donatella Paffetti ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Genetic Polymorphism ◽  
Genetic Structure ◽  
Sinorhizobium Meliloti ◽  
Dna Polymorphism ◽  
Random Amplified Polymorphic Dna ◽  
Analysis Of Molecular Variance ◽  
Molecular Variance ◽  
High Level ◽  
Rhizobium Population

ABSTRACT We analyzed the genetic diversity of 531 Sinorhizobium meliloti strains isolated from nodules of Medicago sativa cultivars in two different Italian soils during 4 years of plant growth. The isolates were analyzed for DNA polymorphism with the random amplified polymorphic DNA method. The populations showed a high level of genetic polymorphism distributed throughout all the isolates, with 440 different haplotypes. Analysis of molecular variance allowed us to relate the genetic structure of the symbiotic population to various factors, including soil type, alfalfa cultivar, individual plants within a cultivar, and time. Some of these factors significantly affected the genetic structure of the population, and their relative influence changed with time. At the beginning of the experiment, the soil of origin and, even more, the cultivar significantly influenced the distribution of genetic variability of S. meliloti. After 3 years, the rhizobium population was altered; it showed a genetic structure based mainly on differences among plants, while the effects of soil and cultivar were not significant.

scholarly journals Genetic diversity of the sunflower caterpillar (Chlosyne lacinia saundersii Doubleday and Hewitson) (Lepidoptera: Nymphalidae) populations determined by molecular RAPD markers

2010 ◽  
Vol 82 (4) ◽  
pp. 1127-1136 ◽  
Author(s):  
Fabiane Cunha ◽  
Daniel R. Sosa Gómez ◽  
Jose J. da Silva ◽  
Talita M. Alexandre ◽  
Flávio Moscardi
Keyword(s):  
Genetic Diversity ◽  
Genomic Dna ◽  
Rapd Markers ◽  
Anticarsia Gemmatalis ◽  
Dice Coefficient ◽  
Analysis Of Molecular Variance ◽  
Molecular Variance ◽  
Main Target ◽  
Geographical Populations ◽  
Santa Maria

Chlosyne lacinia saundersii is one of the most important pests of sunflower and it is the main target of insecticides applications. Larvae were collected in Londrina (PR), Santa Maria (RS), Dourados (MS), Ribeirão Preto (SP), Brasília (DF), Barreiras (BA), Uberaba (MG) and Vilhena (RO). Genomic DNA was extracted and amplified with ten-mer primers, which produced 101 loci. The size of the RAPD amplicons ranged from 180 to 2564 bp. Polymorphism among populations ranged from 31% to 67%, with the highest polymorphisms of 57% and 67% being detected in Uberaba and Vilhena populations, respectively. Populations with the highest similarity determined with Dice coefficient were from Ribeirão Preto and Barreiras, while insects from Londrina showed the highest similarity among them. Gene flow of C. lacinia saundersii 1.1 was lower than those previously observed for the noctuid Anticarsia gemmatalis Hübner, suggesting that C. lacinia saundersii populations are more isolated than the ones of this noctuid. Through the Analysis of Molecular Variance (AMOVA), RAPD variance was 33.64% among geographical populations and 66.36% within populations. These results suggest that populations of C. lacinia saundersii are genetically structured.

scholarly journals Phenotypic and Genetic Diversity Evaluation of Sengon (Falcataria moluccana (Miq.) Barneby & JW Grimes) from Solomon Provenance on Progeny Trial in Cirangsad Experimental Forest, West Java

2021 ◽  
Vol 27 (3) ◽  
pp. 174-183
Author(s):  
F G Dwiyanti ◽  
◽  
I Z Siregar ◽  
U J Siregar
Keyword(s):  
Genetic Diversity ◽  
Phenotypic Variability ◽  
Average Score ◽  
P Value ◽  
Phenotypic Traits ◽  
Analysis Of Molecular Variance ◽  
Molecular Variance ◽  
Phenotypic Quality ◽  
Diversity Evaluation ◽  
Phenotypic And Genetic Diversity

Initial evaluation of phenotypic variability and genetic diversity was conducted on the progeny test of 2 years-old sengon from Solomon provenance, which derived from nine families of mother tree and were then planted in 4 blocks in the Cirangsad Experimental Forest. Phenotypic assessment on eight traits was conducted on 36 trees using a scoring system, while genetic diversity of 15 selected individuals which represented high and low-score phenotypic traits was analyzed using 5 selected RAPD primers. The result on phenotypic assessment showed that family 3 (57.25 points) has the highest average score of phenotypic quality and family 4 has the lowest average score (7.50 points). Furthermore, genetic analysis showed that the low-scoring sengon population had a greater mean genetic diversity (He = 0.2535) than the high-score population (He = 0.2345). The analysis of molecular variance (AMOVA) revealed a significant genetic differences (p-value < 0.001) among high and low-score populations and the dendrogram of genetic distance revealed clustering of individuals having similar superior phenotypic against those having non-superior, indicating the selection based on phenotypes in this study had succeeded in pooling the good quantitative alleles in the selected population. This evaluation results can be used as a reference in determining the best families to produce superior sengon (from Solomon provenance) offspring in the future that have desired adaptability, productivity, and diversity.

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