Navegando por Autor "MOURA, Elisa Ferreira"

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Acesso aberto (Open Access)
Genetic diversity and structure of Oenocarpus mapora germplasm conserved at eastern Amazon
(Universidade Federal do Pará, 2015-12) MOURA, Elisa Ferreira; OLIVEIRA, Maria do Socorro Padilha de; SILVA, Diehgo Tuloza da; PONTES, Lígia Cristine Gonçalves
The aim of this study was to evaluate the genetic diversity and structure in the germoplasm of Oenocarpus mapora conserved at Eastern Amazon. Thus, 88 individuals were genotyped with five microsatellite loci. These individuals belong to 24 accessions that were sampled in eight sample places of three Brazilian Amazon states conserved at the Active Germplasm Bank (AGB) of Embrapa Eastern Amazon. All loci were polymorphic and they generated 85 alleles with an average of 17 alleles per loci. Total genetic diversity (HE) was 0.48. Sample places were considered genetically distinct, with ?p = 0.354. The analysis of molecular variance (AMOVA) identified that the genetic portion among areas was of 36.14% and within 63.86%. The Nei distances varied from 0.091 between Abaetetuba and Santo Antônio do Tauá, both in the state of Pará (PA), to 4.18, between Parintins, AM and Rio Branco, AC. By means of Bayesian analysis, it was identified nine clusters that compose the accessions of the germplasm bank, with different distributions among individuals. The study showed high fixation rates per sample area, which indicates that there may have been significant inbreeding or crossing among parental individuals. It suggests that future samples should be made of different plants in natural populations. Even though, it was verified that there is considerable genetic variation in the germplasm of O. mapora.
Acesso aberto (Open Access)
Identification of duplicates of cassava accessions sampled on the North Region of Brazil using microsatellite markers
(Instituto Nacional de Pesquisas da Amazônia, 2013-12) MOURA, Elisa Ferreira; FARIAS NETO, João Tomé de; SAMPAIO, José Edson; SILVA, Diehgo Tuloza da; RAMALHO, Girena Fernandes
Duplicates are common in germplasm banks and their identification is needed to facilitate germplasm bank management and to reduce maintenance costs. The aim of this work was to identify duplicates of cassava from a germplasm bank in Eastern Amazon, which had been previously characterized both morphological and agronomically. In order to be genotyped with 15 microsatellite loci, 36 accessions were selected. These accessions were classified into 13 groups of similar morpho-agronomical characteristics. All loci were polymorphic, and 75 alleles were identified, with an average of five alleles per loci and HE = 0.66. There were determined 34 pairs of genotypes with identical multiloci profiles and the probability of genetic identity was 1.1x10-12 with probability of exclusion of 99.9999%. Among these duplicates, there are accessions sampled on different years and places, but with different names and accessions with the same name sampled in different places and years. The study identified genotypes that are grown in different places and that have been maintained over the years by local farmers.
Acesso aberto (Open Access)
Molecular characterization of progenies of bacurizeiro (Platonia insignis) from Marajó Island, northeastern Amazon
(Instituto Nacional de Pesquisas da Amazônia, 2017-12) PONTES, Lígia Cristine Gonçalves; MOURA, Elisa Ferreira; MOURA, Mônika Fecury; RODRIGUES, Simone de Miranda; OLIVEIRA, Maria do Socorro Padilha de; CARVALHO, José Edmar Urano de; THERRIER, Josette
The bacurizeiro (Platonia insignis Mart.) is a tree native to the Amazon whose fruit is much used in the gastronomy in the North and Northeast regions of Brazil. Due to its great economic potential for these regions, the species is being conserved in germplasm banks to support genetic breeding programs. The aim of this work was the molecular characterization of P. insignis accessions belonging to the germplasm bank of the Embrapa Eastern Amazon research unit using ISSR (Inter Simple Sequence Repeat) markers. Seventy-eight accessions of P. insignis belonging to 16 progenies were sampled in two different localities on Marajó Island, state of Pará, Brazil. Among the 16 progenies, seven were collected in Soure and nine in Salvaterra. The 78 accessions were genotyped with 23 pre-selected primers. We obtained 121 amplified products, of which 54 were polymorphic. The most polymorphic primers were UBC 834, UBC 899 and UBC 900. Primers UBC810 and UBC884 did not amplify polymorphic bands. Forty-nine markers out of 54 were selected for genetic analyses. AMOVA within and among progenies showed low genetic differentiation (ΦPT = 0.064, P<0.001) with higher diversity within progenies (96%), low genetic differentiation among sampling localities (ΦPT = 0.025, P<0.013), and higher diversity within (98%) than among localities. Clustering by UPGMA based on Jaccard similarities among pairs of accessions did not separate genotypes according to progeny or sampling localitiy. We recommend that new germplasm surveys consider a greater sampling effort within sampling localitites.