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Search Results: 1 - 10 of 64349 matches for " Flávia Barbosa Silva Botelho "
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Sitophilus Weevil Reaction in Upland Rice Elite Lines  [PDF]
Flávia Barbosa Silva Botelho, Marcela Pedroso Mendes, Rodrigo Teixeira de Carvalho Botelho, Adriano Teodoro Bruzi, Cinthia Souza Rodrigues, Natália Botega Alves, Heloisa Oliveira dos Santos
American Journal of Plant Sciences (AJPS) , 2015, DOI: 10.4236/ajps.2015.612192
Abstract: Insects of the genus Sitophilus are among the most destructive pests in rice storage, and the best strategy to control it is to use resistant genotypes. In this study, 26 upland rice elite lines were evaluated for Sitophilus weevil reaction on grain weight. The seeds were placed in plastic recipients stored in a room with temperature and lightning simulating a warehouse environment. The number of living weevils and the grain weight were obtained in two evaluations, one 35 days after storage, and the other 35 days after infestation. The lines differed statistically for number of living weevils and for grain weight in both evaluations. The correlations between these two characters were -?0.99 and -?0.47 for the first and the second evaluation (P < 0.05), respectively. The lines BRS Pepita, AB 112089 and AB 112090 were the most susceptible. Seventeen of the twenty-six elite lines were resistant in both evaluations and could be successfully used in upland rice breeding programs.
Genetic and Phenotypic Parameters in the Selection of Upland Rice Genotypes  [PDF]
Camila Soares Cardoso da Silva, Flávia Barbosa Silva Botelho, Cinthia Souza Rodrigues, Marcela Pedroso Mendes, Amanda Mendes de Moura, Ant?nio Rosário Neto
American Journal of Plant Sciences (AJPS) , 2017, DOI: 10.4236/ajps.2017.813232
Abstract: To assist in upland rice breeding programs, estimated genetic and phenotypic parameters are extremely important in the selection of superior lines. Thus, the objective of this study was estimate the genetic and phenotypic parameters of upland rice lines of the breeding program of UFLA in partnership with Embrapa Arroz e Feijao and Epamig. The experiment was installed in an experimental area of the Department of Agriculture at UFLA. It was evaluated 36 upland rice lines of the preliminary trial of the 2014/15 season, in randomized blocks, with three replications and plots consisted of five rows and each row has four meters. For this, it was evaluated the characters: plant height (cm), yield (kg·ha-1), 100-grain weight, days until flowering, percentage of filled grains and rice blast severity. The variance analysis and genetic parameters were estimated using the software SAS. To evaluate the experimental precision was estimated the accuracy, which varied between 63% and 98%, showing experimental precision, moderate to high. The lines differed significantly for all characters, meaning there is genetic variability among genotypes evaluated. With intensity of selection of 10% of lines, it was obtained a genetic gain of 325.29 kg·ha-1 in the character productivity, a plant height (cm) reduction in 5.50 cm, and days until flowering, with a reduction of 9.23 days, with selection of earlier plants. The estimated values for heritability ranged from 38% - 96%. Estimates confirm the possible success with the selection of the upland rice lines for these characters.
Performance of Conventional and Transgenic Soybean Cultivars in the South and Alto Paranaiba Regions of Minas Gerais, Brazil  [PDF]
Isabela Pereira de Lima, Adriano Teodoro Bruzi, Flávia Barbosa Silva Botelho, Everton Vinicius Zambiazzi, Igor Oliveri Soares, Alan Mario Zuffo
American Journal of Plant Sciences (AJPS) , 2015, DOI: 10.4236/ajps.2015.69138
Abstract: The aim of this study was to compare transgenic and conventional soybean cultivars in regard to yield performance and agronomic traits. Six soybean cultivars were tested: three conventional cultivars and their three isogenic transgenic derivatives, in two locations, Lavras and Patos de Minas in Minas Gerais, Brazil, in the 2012/13 crop season. Data on yield (kg·ha-1), plant height (cm), and tolerance to lodging were collected. The cultivars had different responses. The cultivar BRS/MG46 Conquista had lower yields than its isogenic derivative BRS Valiosa RR, but this was not seen with the conventional cultivar M-SOY 6101, which produced more than its isogenic derivative M-SOY 7211 RR. Between the isogenic cultivars BRS/MG68 Vencedora and BRS Favorita RR, there were no significant differences. Nevertheless, the contrast between the mean values of the transgenic and conventional cultivars shows that the conventional cultivars had mean values greater than the transgenic cultivars.
Quality of Seeds of Upland Rice Lines Adapted to the State of Minas Gerais, Brazil  [PDF]
Heloisa Oliveira dos Santos, Flávia Barbosa Silva Botelho, Ana Cláudia de Amorim Fonseca, Ricardo Kenji Uenojo, Marcela Pedroso Mendes, Edila Vilela de Resende Von Pinho
American Journal of Plant Sciences (AJPS) , 2015, DOI: 10.4236/ajps.2015.612193
Abstract: In the final stages of a plant breeding program, a crucial step is the multiplication of seeds in production fields. Besides a solid planning, the seeds multiplication needs a special attention to guarantee seeds with high quality, genetic integrity, high germination and vigor to the farmer. The aim of this study was to evaluate the physiologic quality, enzymatic expression and respiratory activity of seeds of 20 elite upland rice lines adapted to the state of Minas Gerais, Brazil, from the upland rice breeding program from three Brazilians research institutions. The quality parameters evaluated were root protrusion, number of normal seedlings in the germination test, number of normal seedlings in the germination first count, initial stand from emergence test, speed of emergence index, seedlings shoot and root length, percentage of O2 and CO2 from respiratory activity and the expression pattern of the enzymes alcohol dehydrogenase (ADH) and malate dehydrogenase (MDH). The seeds quality varied among lines, allowing the selection of lines with best performance. The respiratory activity was lower in seeds of lines with high quality. The enzyme ADH was an excellent marker to infer about the quality of seeds, and the variation in the expression of MDH did not depend on the quality of rice seeds. The lines BRS Esmeralda, CMG1896 and CMG1509 showed high physiologic quality in their seeds, and therefore, they should receive higher attention in rice breeding programs.
Allelopathic Effect of the Coffee Residue in Emergency and Urochloa brizantha Growth  [PDF]
Bruno Manoel Rezende de Melo, Tácio Peres da Silva, Douglas Goulart Castro, Flávia Barbosa Silva Botelho, Emily Renata Moreira, Suelen Sim?o Gomes, Heloisa Oliveira dos Santos
American Journal of Plant Sciences (AJPS) , 2018, DOI: 10.4236/ajps.2018.94050
Abstract: Weed management is important for the increase of agricultural crops, since they have a negative influence on yield and harvest quality. To optimize the management it is possible to use the coffee infusion residues, which has caffeine contents, a substance that has an allelopathic effect to some plants. Thus, the goal was to evaluate the allelopathic effect of coffee residues in the emergence and growth of Urochloa brizantha under product doses, gathering and application seasons in pre- and post-emergence. The experiment was carried out at UFLA, in a greenhouse with potting, with Urochloa brizantha seeds, cultivar Piata, in DBC with three replicates in the factorial (3 × 4 × 2): time of gathering (A, B, C); concentration of ground (0, 20, 50 and 100 (% W/V)) and pre- and post-emergence application. The height, fresh and dry weight, Emergence Speed Index—ESI and phytotoxicity were evaluated. It was verified the significance for pre-emergence treatments, reducing plant height, increasing phytotoxicity and reducing fresh weight. For the ESI, it was identified that only for gathering season obtained a significant result. In the phytotoxicity evaluations, it obtained interaction for the season of application with residue
Estimates of compensation and stability parameters in common bean lines aiming at multilines
Flávia Barbosa Silva Botelho,Magno Antonio Patto Ramalho,?ngela de Fátima Barbosa Abreu,Breno Alvarenga Rezende
Crop Breeding and Applied Biotechnology , 2008,
Abstract: This study aimed to determine parameter estimates of compensation of common bean lines and verify if thestability of a mixture of lines is higher than of the line components. Six common bean lines were evaluated, pairwise, in equalproportions. The experiments were conducted in 11 environments, where the trait seed yield was evaluated (grams per plot).The positive ci estimate (compensation ability of line i) of cultivar Talism was highest, indicating the line for mixtures. Thecombination of the pair Carioca and MA-II-16, with the highest positive sij estimate (specific compensation ability for the pairof lines i and j), was satisfactory. It was observed that the mean contribution of mixtures to the interaction was in the meanlower than of lines in monoculture. The stability was highest in the mixture Talism and MA-II-8 and the risk of adoptionlowest. The estimates of these compensation and stability parameters in mixtures underlying additional information are asupport in the choice of lines to compose a multiline.
Genetic control of the number of days to flowering in common bean
Marcela Pedroso Mendes,Flávia Barbosa Silva Botelho,Magno Antonio Patto Ramalho,?ngela de Fátima Barbosa Abreu
Crop Breeding and Applied Biotechnology , 2008,
Abstract: The aim of this study was to investigate the genetic control of early flowering in common bean. Crosses weremade between the parents Pérola and BRS Radiante and between ESAL 506 and Preto 60 dias. The segregating generations,F3, F2BC11 and F2BC12 of each cross were evaluated in experiments with two replications. F3 plants of both crosses wererandomly taken, and F3:4 progenies evaluated for the trait number of days to flowering. There was good adjustment to theadditive-dominant model of both crosses. The dominance effect was lower than the additive effect in the trait control and, whenpresent, it reduced the number of days to flowering. The value of realized heritability (h2R) was similar in both crosses andlower than the h2 estimated for selection among F3:4 progenies. There were indications that aside from the environmental effecton the trait expression, the genotype-environment interaction was also significant.
Phenotypic and Enzymatic Analyses of Upland Rice Lines Seeds under No-Tillage  [PDF]
Heloisa Oliveira dos Santos, Flávia Barbosa Silva Botelho, Ricardo Kenji Uenojo, Ana Cláudia de Amorim Fonseca, Marcela Pedroso Mendes, Edila Vilela de Resende Von Pinho, Maria Laene Moreira de Carvalho
American Journal of Plant Sciences (AJPS) , 2015, DOI: 10.4236/ajps.2015.612199
Abstract: Over 40% of the agricultural area in Brazil corresponds to no-tillage farming. Although it is evident the importance of obtaining upland rice cultivars adapted to this cropping system, researches in this sense are still incipient and breeders do not have cultivars available to recommend with enough security. The aim of this study was to evaluate phenotypic characters favorable to the no-tillage system in order to establish the basis for upland rice breeding programs interested in this cropping system. The seeds of twenty elite inbred lines from the Upland Rice Breeding Program from the Brazilian research institutions UFLA, EMBRAPA and EPAMIG were evaluated at the Central Seeds Lab from the Agriculture Department of UFLA following a randomized block design with four replicates. The characters evaluated were seedlings emergence (SE), green matter yield (GM), dry matter yield (DM), photosynthetic activity (PA), and superoxide dismutase activity (SOD). The quality parameters evaluated were obtained by a germination test (GT), germination first count (GFC), emergence test (E), initial stand (IS), and alpha-amylase expression. The lines CMG 2074, CMG 1967, CMG 2017, BRSMG Caravera and CMG 2097 showed higher SOD content in the enzymatic analyses, and consequently higher tolerance to abiotic stresses that could be caused by no-tillage. Considering the evaluation of agronomic traits, the line CMG 1967 showed the best performance in no-tillage soil and, therefore, should receive higher attention in Upland Rice Breeding Programs.
Discrimina??o simples com mudan?as sucessivas na fun??o dos estímulos: aprendizagem em bebês
Silva, Flávia Teresa Neves;Souza, Carlos Barbosa Alves de;
Psicologia: Teoria e Pesquisa , 2009, DOI: 10.1590/S0102-37722009000400012
Abstract: this study investigated the acquisition of repeated shifts of simple discriminations (rssd) in three infants. animated images were presented on a touch sensitive screen. the procedure started off with a two-choice simple discrimination training (sd) with shifts in the stimulus function until all stimuli had functioned once as s+ and once as s-. afterwards, all the three stimuli were presented in the same trial completing a rssd cycle. two of the infants learned the rssd with the two-choice procedure and one infant learned the sd with two stimuli. the replacement of the stimulus sets throughout the training, characterized as a multiple exemplar training, seems to have contributed to the infants' engagement in the task as well as to the acquisition of the discriminations.
Sele??o recorrente fenotípica para florescimento precoce de feijoeiro 'Carioca'
Silva, Flávia Barbosa;Ramalho, Magno Antonio Patto;Abreu, ?ngela de Fátima Barbosa;
Pesquisa Agropecuária Brasileira , 2007, DOI: 10.1590/S0100-204X2007001000010
Abstract: the objective of this work was to evaluate the efficiency of phenotypic recurrent selection for the number of days until blooming in common bean, and to verify if this selection affected other traits. one s0 population derived from the mixture of the f2 populations of 11 hybrid combinations evaluated for earliness was used. the plants of the s0 (cycle 0) which bloomed first were crossed to obtain cycle i. to go on with the selection the obtained seeds were used. the process was repeated until the fifth selection cycle. fifty-three s1:2 progenies of each cycle were used for evaluation of the genetic progress. the number of days to flowering, severity of angular leaf spot (phaeoisariopsis griseola), number of days to maturation, yield and grain type were evaluated. a selection gain of 2.2% per year was observed, which indicates that phenotypic recurrent selection reduced the number of days to flowering. the selection for the number of days to flowering had no correlated response with other evaluated traits, indicating that progeny selection for early flowering can be associated with the phenotypic expression of other traits, according to the breeder's interest.
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