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Search Results: 1 - 10 of 10199 matches for " Marcela Pedroso Mendes "
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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.
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.
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.
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.
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.
Clausewitz, o realismo estrutural e a paz democrática: uma abordagem crítica Clausewitz, structural realism and the democratic peace: a critical approach
Flávio Pedroso Mendes
Contexto Internacional , 2012, DOI: 10.1590/s0102-85292012000100003
Abstract: Prop e-se a aprecia o crítica do sistemático estudo da paz democrática realizado por Oneal e Russett em Triangulating peace - democracy, interdependence and international organizations (2001). O estudo de Oneal e Russett é importante e representativo porque oferece uma constru o teórica para explicar um suposto "fato" internacional e porque tenta incorporar e controlar algumas variáveis identificadas com a principal abordagem rival: o realismo político. Argumentar-se-á que Oneal e Russett falham em suas duas principais tentativas de contribui o. O princípio causal identificado pelos autores n o resiste ao entendimento, derivado da teoria da guerra de Clausewitz, da guerra como um fen meno integralmente político. Incidentalmente, essa crítica também será válida para o empreendimento dos teóricos da paz democrática como um todo, na medida em que compartilhem os mesmos pressupostos. E os autores n o s o capazes de identificar e controlar as variáveis "realistas" como pretendido, n o se precavendo, portanto, contra a crítica de epifenomenalidade. The purpose of the article is to undertake a critical analysis of the democratic peace approach laid out in Oneal and Russett's Triangulating peace - democracy, interdependence and international organizations (2001). This study offers a theoretical framework to explain a supposed international "fact" and attempts to incorporate and control some variables of the main approach it seeks to challenge - structural realism. The article argues that Oneal and Russett fail in their two main attempted contributions. The causal mechanism identified by the authors does not withstand resist the understanding, derived from Clausewitz's theory of war, of war as an integral political phenomenon. Incidentally, this criticism also applies to other prominent works on the democratic peace, given these share the same assumptions. Furthermore, the authors are incapable of identifying and controlling the "realist" variables as planned, which makes them vulnerable to the criticism of epiphenomenalism.
Gastrocopta iheringi (Suter, 1900) (Gastropoda, Vertiginidae): redescription of type material
Inga L. Veitenheimer-Mendes,Carla Regina Pedroso de Oliveira
Biotemas , 2012,
Abstract: The holotype of Gastrocopta iheringi (Suter, 1900) was redescribed, illustrated and its identity was confirmed. The goal of this work was to elucidate questions relating to the identification of micromollusks in the genus Gastrocopta Wollaston, 1878.
Características morfológico-vegetativas de cultivares de coqueiro
Alves, Amanda da Silva;Arag?o, Wilson Menezes;Loiola, Carina Mendes;Pedroso, Gabriele Torino;
Revista Brasileira de Fruticultura , 2007, DOI: 10.1590/S0100-29452007000300021
Abstract: the present work was carried out from august 1997 to december 2000, at the "plato of neópolis", state of sergipe, aiming to evaluate the characteristics of number of alive leaves (nfv), number of born leaves (nfe), stem diameter (cc), length of leaf 3 (cf3) length of the leaf blade of leaf 3 (clf3), length of the petiole of leaf 3 (cpf3), and number of leaflets of leaf 3 (cfof3) of coconut (cocus nucifera l.) cultivars, in different agricultural years. a split plot randomized block design with four replications, fourteen treatments and three years of evaluations was used. records were taken in 16 plants/plot. statistic analysis of data showed significant differences among cultivars and years for all the evaluated characteristics. highly significant interaction between cultivar x year was found for nfe and significant interactions for the remained characteristics, pointing out for a diverse behavior of cultivars in relation to the year crop.
Compara??o entre a telelaringoscopia e a laringoscopia de suspens?o no diagnóstico das les?es benignas das pregas vocais
Mendes Neto, José Arruda;Pinna, Bruno Resende;Caporrino Neto, José;Pedroso, José Eduardo de Sá;
Revista Brasileira de Otorrinolaringologia , 2008, DOI: 10.1590/S0034-72992008000600009
Abstract: proper diagnosis of laryngeal benign lesions still brings doubts among experienced laryngologists, despite current diagnostic progress. aim: the goal of this study was to compare telelaryngoscopy (preoperative) with suspension laryngoscopy (intraoperative) on the diagnosis of vocal fold benign lesions. materials and methods: we carried out a restrospective study analyzing 79 charts from patients followed up in a university hospital. in all the charts there was at least diagnostic hypothesis suggested by telelaryngoscopy, which was later on compared to intraoperative findings of suspension laryngoscopy. results: almost two-thirds of the patients were females, with ages varying between 12 and 66 years (mean of 37 years). of the 79 patients studied, we diagnosed 95 lesions with telelaryngoscopy and 124 with suspension laryngoscopy. the most frequently found benign lesion was the vocal polyp in both methods. in 64.5% of the cases the diagnosis of the lesions in the outpatient ward was the same as those in the surgical findings. conclusion: laryngologists must be prepared to alter their surgical planning and treatment approaches because of diagnostic changes that may happen during surgery.
Comportamento sexual de touros Zebuínos e Angus em central de coleta e processamento de sêmen
Bascu?an, Daniela Sartori Rocha;Jorge, André Mendes;Rocha, Gilberto Pedroso da;Weschler, Francisco Stefano;Andrighetto, Cristiana;
Revista Brasileira de Zootecnia , 2008, DOI: 10.1590/S1516-35982008000200011
Abstract: this study aimed to evaluate the sexual behavior of 88 bulls of the angus and zebu (gyr, guzerat and nellore) breeds managed for collection and processing of semen at an artificial insemination center. on average, bulls were at 5 years of age, 906 kg of live weight and 41 cm for scrotal circumference. reaction time in all breeds was positively influenced by the "moving" stimuli teaser. reaction time in angus bulls was smaller than in bulls of the zebu breeds and longer in older than in younger bulls. the daily mount order did not influence the reaction time. all sexual behavior traits in the angus bulls were close to complete mount with artificial vagina. the behavior for "smelling and licking the genitalia", "beating using the head or the horn", "drip of seminal liquid", "erection and penis protrusion" and "aborted mount" were more usual in zebu than in angus bulls. among zebu breeds "prepuce contraction" and "aborted mount" were more frequent in nellore than in guzerat bulls and "complete mount without end force" was more observed in nellore and guzerat than in gyr bulls.
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