scholarly journals Genetic structure and diversity of native Guadua species (Poaceae: Bambusoideae) in natural populations of the Brazilian Amazon rainforest

2020 ◽  
Vol 92 (3) ◽  
Author(s):  
SUSANA M.M. SILVA ◽  
KARINA MARTINS ◽  
FREDERICO H.S. COSTA ◽  
TATIANA DE CAMPOS ◽  
JONNY E. SCHERWINSKI-PEREIRA
Keyword(s):  
Genetic Structure ◽  
Natural Populations ◽  
Brazilian Amazon ◽  
Amazon Rainforest ◽  
Genetic Structure And Diversity

Genetic structure and diversity in natural populations of three predominantly self-pollinating wild Lactuca species in Israel

2014 ◽  
Vol 62 (7) ◽  
pp. 991-1008 ◽  
Author(s):  
Miloslav Kitner ◽  
Luboš Majeský ◽  
Eva Křístková ◽  
Michaela Jemelková ◽  
Aleš Lebeda ◽  
...  
Keyword(s):  
Genetic Structure ◽  
Natural Populations ◽  
Lactuca Species ◽  
Genetic Structure And Diversity

scholarly journals Genetic Structure in Populations of Euterpe precatoria Mart. in the Brazilian Amazon

2021 ◽  
Vol 8 ◽  
Author(s):  
Santiago Linorio Ferreyra Ramos ◽  
Gabriel Dequigiovanni ◽  
Maria Teresa Gomes Lopes ◽  
Ananda Virginia de Aguiar ◽  
Ricardo Lopes ◽  
...  
Keyword(s):  
Genetic Structure ◽  
Bayesian Analysis ◽  
Management Strategies ◽  
Geographic Distance ◽  
Natural Populations ◽  
Population Level ◽  
Brazilian Amazon ◽  
The State ◽  
Fixation Index ◽  
Palm Tree

Euterpe precatoria is a palm tree belonging to the Arecaceae family, occurring in Western and Central Brazilian Amazonia. Its fruit, which is very appreciated in the Amazon region, produces pulp that is consumed in fresh form. Its production is carried out almost exclusively by extractive farmers. In order to establish adequate strategies to sustain this genetic resource, we need knowledge about the diversity and genetic structure in natural populations. This study aimed to evaluate the influence of geographic distance on genetic structure in the main extractive populations of E. precatoria in the Brazilian Amazon. Leaves from 377 plants were collected in 19 populations located in 16 municipalities in the State of Amazonas and three in the State of Rondônia. Twelve microsatellite loci were used to genotype the plants. The diversity and genetic structure among populations were estimated. The average number of alleles per locus was 5.97. The observed heterozygosity means (HO) were higher than expected (HE) at the population level (HO = 0.72, HE = 0.66) and fixation index (f = -0.100) was negative. The FST value (0.1820) and the AMOVA results (Φ = 0.1796) showed population structure. The populations were clustered into three groups (K = 3) in the Bayesian analysis. The Discriminant Analysis of Principal Components (DAPC) confirmed eight clusters, with the populations close to those identified by the Bayesian analysis. The geographic differentiation was confirmed by the groupings obtained in the Structure analysis and the DACP function. Information related to phenotypic, genetic and environmental characterization of populations is important to guide conservation and management strategies and the formulation of public species management policies in Amazonia.

scholarly journals Spatial genetic structure and diversity of natural populations of Aesculus hippocastanum L. in Greece

PLoS ONE ◽  
2019 ◽  
Vol 14 (12) ◽  
pp. e0226225
Author(s):  
Łukasz Walas ◽  
Petros Ganatsas ◽  
Grzegorz Iszkuło ◽  
Peter A. Thomas ◽  
Monika Dering
Keyword(s):  
Genetic Structure ◽  
Spatial Genetic Structure ◽  
Natural Populations ◽  
Aesculus Hippocastanum ◽  
Genetic Structure And Diversity

scholarly journals Application of Multilocus Sequence Typing To Study the Genetic Structure of Megaplasmids in Medicago-Nodulating Rhizobia

2010 ◽  
Vol 76 (12) ◽  
pp. 3967-3977 ◽  
Author(s):  
Peter van Berkum ◽  
Patrick Elia ◽  
Bertrand D. Eardly
Keyword(s):  
Genetic Structure ◽  
Multilocus Sequence Typing ◽  
Sinorhizobium Meliloti ◽  
Natural Populations ◽  
Allelic Diversity ◽  
Intragenic Recombination ◽  
Symbiotic Gene ◽  
Close Proximity ◽  
History Of ◽  
Genetic Structure And Diversity

ABSTRACT A multilocus sequence typing (MLST) analysis was used to examine the genetic structure and diversity within the two large extrachromosomal replicons in Medicago-nodulating rhizobia (Sinorhizobium meliloti and Sinorhizobium medicae). The allelic diversity within these replicons was high compared to the reported diversity within the corresponding chromosomes of the same strains (P. van Berkum et al., J. Bacteriol. 188:5570-5577, 2006). Also, there was strong localized linkage disequilibrium (LD) between certain pSymA loci: e.g., nodC and nifD. Although both of these observations could be explained by positive (or diversifying) selection by plant hosts, results of tests for positive selection did not provide consistent support for this hypothesis. The strong LD observed between the nodC and nifD genes could also be explained by their close proximity on the pSymA replicon. Evidence was obtained that some nodC alleles had a history of intragenic recombination, while other alleles of this locus had a history of intergenic recombination. Both types of recombination were associated with a decline in symbiotic competence with Medicago sativa as the host plant. The combined observations of LD between the nodC and nifD genes and intragenic recombination within one of these loci indicate that the symbiotic gene region on the pSymA plasmid has evolved as a clonal segment, which has been laterally transferred within the natural populations.

Understanding introduction history: Genetic structure and diversity of the edible ectomycorrhizal fungus, Suillus luteus, in Patagonia (Argentina)

Mycologia ◽  
2021 ◽  
pp. 1-10
Author(s):  
María Belén Pildain ◽  
Paula Marchelli ◽  
María Marta Azpilicueta ◽  
Cristian Starik ◽  
Carolina Barroetaveña
Keyword(s):  
Genetic Structure ◽  
Ectomycorrhizal Fungus ◽  
Suillus Luteus ◽  
Introduction History ◽  
Genetic Structure And Diversity

Furuncular Myiasis by Dermatobia hominis (Diptera: Oestridae) in Wild Jaguars in the Amazon Rainforest

2021 ◽  
Author(s):  
Matheus Mickael Mota Soares ◽  
Luana Machado Barros ◽  
Daniela Aparecida Savariz Bôlla ◽  
Marlus Queiroz Almeida ◽  
Diego da Costa Souza ◽  
...  
Keyword(s):  
Brazilian Amazon ◽  
First Record ◽  
Amazon Region ◽  
Amazon Rainforest ◽  
Panthera Onca ◽  
Dermatobia Hominis ◽  
Furuncular Myiasis

Abstract Two individuals of the jaguar, Panthera onca (L.), were captured near the municipality of Presidente Figueiredo, Brazilian Amazon, during the years of 2017 and 2018. The jaguars presented furuncular myiasis caused by the human botfly Dermatobia hominis (L.) on the rear thighs and tail. This is the first record of infestation of D. hominis in P. onca in the Amazon region.

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