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Sele??o de gen?tipos e an?lise da express?o g?nica diferencial induzida por Thaumastocoris peregrinus (Hemiptera: Thaumastocoridae) em Eucalyptus spp.; Genotypic selection and analysis of differential gene expression induced by Thaumastocoris peregrinus (Hemiptera:Thaumastocoridae) on Eucalyptus spp.

Ferreira, Marcele dos Santos
Fonte: UFVJM Publicador: UFVJM
Tipo: Dissertação de Mestrado
POR
Relevância na Pesquisa
56.45%
ABSTRACT The genus Eucalyptus encompasses hundreds of known species with high commercial interest. This forest genus is largely responsible for the supply of the wood production chain in Brazil. Several aspects can negatively affect the plantation productivity, for example the occurrence of pests and diseases. The bronze bug Carpintero e Dellap?, 2006 (Hemiptera:Thaumastocoridae) is a new exotic pest in Brazil. A strategy to reduce the negative effects of the insect pests is to select genetic material with resistance. The isolation and identification of resistance genes can be used in order to obtain individuals with desirable characteristics. The present study aimed to evaluate genetic materials of Eucalyptus spp. under the attack of Thaumastocoris peregrinus and make cDNA libraries from contrasting materials. The choice of genotypes relied on different methodologies conducted in laboratory, climate-controlled room and greenhouse. There were studied 27 hybrid clones. The genotypes C03 and C17, were selected along with E. camaldulensis seedlings and subjected to the attack of T. peregrinus. Two genomic subtractive libraries were made from the total RNA samples, one containing the differentially expressed genes between C03 and E. camaldulensis...

Desempenho e caracter?sticas de carca?a de tr?s gen?tipos comerciais de frangos de corte alimentados com diferentes dietas; Performance and carcass traits of three commercial broilers genotypes fed with different diets

Polcaro-Silva, Maria Teresa
Fonte: UFVJM Publicador: UFVJM
Tipo: Dissertação de Mestrado
POR
Relevância na Pesquisa
46.57%
Objetivou-se, com esse trabalho, avaliar caracter?sticas de desempenho e de carca?a de tr?s gen?tipos comerciais de frangos de corte, nos per?odos de 1 a 35, 1 a 42 e 1 a 49 dias de idade. Foram utilizados 2.970 pintos de um dia, machos e f?meas, sexados, de tr?s gen?tipos comerciais de frangos de corte (Cobb 500, Hubbard Flex e Ross 308). Foram utilizados tr?s programas nutricionais, com diferentes n?veis de amino?cidos. As aves foram distribu?das em delineamento inteiramente casualizado, em ensaio fatorial 3x3x2 (gen?tipo x ra??o x sexo), com cinco repeti??es e 33 aves/parcela. As caracter?sticas convers?o alimentar (CA), ganho em peso m?dio di?rio (GPMD) e consumo de ra??o m?dio individual (CR) peso corporal aos 35 (PC35), 42 (PC42) e 49 (PC49) dias de idade. Duas aves de cada repeti??o foram abatidas aos 35, 42 e 49 dias de idade para se avaliarem as caracter?sticas de carca?a: peso corporal ao abate, peso e rendimento da carca?a, peso e rendimento dos cortes (peito, pernas e asas). Verificou-se, no per?odo de 1 a 35 dias, intera??o entre gen?tipo x sexo para GPMD e PC35. No per?odo de 1 a 42 dias de idade, n?o houve diferen?as entre os gen?tipos para PC42, CR, GPMD ou CA. Verificou-se intera??o significativa sexo x gen?tipo para peso do peito...

V?rus da Hepatite C: preval?ncia dos gen?tipos, fatores de risco, altera??es bioqu?micas e histopatol?gicas de pacientes atendidos no N?cleo de Medicina Tropical

FECURY, Amanda Alves
Fonte: Universidade Federal do Pará Publicador: Universidade Federal do Pará
Tipo: Dissertação de Mestrado
POR
Relevância na Pesquisa
56.62%
A hepatite causada pelo HCV constitui-se de uma doen?a silenciosa que tende a evoluir para a forma cr?nica. A persist?ncia viral, fatores gen?ticos do indiv?duo e do v?rus (gen?tipos), estilo de vida e exposi??o a fatores de risco aumentam as chances de o portador desenvolver carcinoma hepatocelular. Este estudo teve como objetivo verificar a fun??o hep?tica dos pacientes com hepatite C; avaliar os fatores de riscos para aquisi??o do v?rus; determinar os gen?tipos de HCV mais prevalentes e correlacionar os gen?tipos com os achados histopatol?gicos das bi?psias hep?ticas. A amostra constituiu-se de 152 pacientes adultos com sorologia (ELISA) reagente para anticorpos anti-HCV, que aceitaram participar da pesquisa, colheram amostra sangu?nea para as an?lises e responderam a um question?rio epidemiol?gico. A an?lise epidemiol?gica demonstrou maioria do sexo masculino, faixa et?ria de 45 anos e predom?nio de indiv?duos casados ou com uni?o est?vel. Quanto aos fatores de risco para aquisi??o da infec??o, observou-se a multiplicidade de parceiros, o n?o uso de preservativos, interna??es hospitalares e o compartilhamento de kits de manicure. Na detec??o do RNA viral, 107 (70,4%) apresentaram positividade, sendo 97 (90,6%) do gen?tipo 1 e 10 (9...

Preval?ncia de gen?tipos e de mutantes pr?-core A-1896 do v?rus da hepatite B e suas implica??es na hepatite cr?nica, em uma popula??o da Amaz?nia oriental

CONDE, Simone Regina Souza da Silva; M?IA, Lizomar de Jesus Mau?s Pereira; BARBOSA, Maria Silvia de Brito; AMARAL, Ivanete do Socorro Abra?ado; MIRANDA, Esther Castello Branco Mello; SOARES, Manoel do Carmo Pereira; BRITO, Elizabete Maria de Figueiredo; S
Fonte: Universidade Federal do Pará Publicador: Universidade Federal do Pará
Tipo: Artigo de Revista Científica
POR
Relevância na Pesquisa
56.45%
A infec??o pelo virus da hepatite B apresenta amplo espectro de manifesta??es cl?nicas. Objetivando conhecer os gen?tipos do HBV mais prevalentes e determinar a ocorr?ncia da muta??o pr?-core A-1896, em uma popula??o da Amaz?nia oriental, correlacionando com o diagn?stico cl?nico, foram selecionados 51 pacientes portadores cr?nicos de HBsAg e HBV-DNA positivos e divididos em tr?s grupos: grupo A (n=14, pacientes assintom?ticos); grupo B (n=20, sintom?ticos HBeAg positivos) e grupo C (n=17, sintom?ticos HBeAg negativos), sendo usado o sequenciador autom?tico ABI modelo 377 para identifica??o de gen?tipos e mutantes pr?-core. Os resultados evidenciaram o gen?tipo A como o mais prevalente, 81,8%, 89,5% e 93,7%, nos grupos A, B e C, respectivamente. A muta??o pr?-core A-1896 foi encontrada em 11,5% (3/26), sendo todos assintom?ticos. Concluiu-se que na popula??o estudada o gen?tipo A foi o mais prevalente e houve baixa ocorr?ncia do mutante pr?-core A-1896, ambos n?o se constituindo fatores agravantes da doen?a hep?tica.; ABSTRACT: Hepatitis B virus (HBV) infection presents itself with a variety of clinical manifestations. The present work aims to describe the prevalence of HBV genotypes and the occurrence of precore mutation A-1896 in a population group of the Eastern Amazon region of Brazil and to correlate them with the clinical presentation of chronic HBV infection. 51 HBsAg carriers (HBV-DNA positive) were selected and divided into three groups: A (14 asymptomatic subjects)...

Variabilidade gen??tica e toler??ncia ao d??ficit h??drico em gen??tipos de batata (Solanum tuberosum L.); Genetic variability and tolerance to water deficit in genotypes of potato (Solanum tuberosum L.)

ROHR, Angela
Fonte: Universidade Federal de Pelotas; Agronomia; Programa de P??s-Gradua????o em Agronomia; UFPel; BR Publicador: Universidade Federal de Pelotas; Agronomia; Programa de P??s-Gradua????o em Agronomia; UFPel; BR
Tipo: Dissertação Formato: application/pdf
POR
Relevância na Pesquisa
46.62%
The potato is the third major food crop in the world and is one of the most sensitive species to water deficit. Given the climate change scenario, the cultivation of potatoe is highly threatened, and it is urgent the need to develop varieties adapted to this demand. This work was developed aiming to characterize the genetic structure of the potato germplasm from Embrapa breeding program and to evaluate the response of potato genotypes to water deficit in two growing seasons. To evaluate the genetic structure from potato germplasm, 131 genotypes were characterized with seven SSR loci. The results showed that although the evaluated germplasm has shown a wide and unstructured genetic variability, there is a trend of narrowing the genetic base that is actually being used by the breeding program. To evaluate the response of potato genotypes to drought stress, 12 genotypes were evaluated in two seasons, spring and fall, in hydroponic culture using polyethyleneglycol to simulate a water deficit of -0.129 MPa. The genotypes were evaluated with respect to various morphological and agronomic characters, such as root and shoot dry weight as well as number of tubers produced per plant. Based on the results of this work can be seen that the potato genotypes respond differently to drought stress depending on the growing season that it is cultivated...

Avalia????o de gen??tipos de aveia (Avena sativa L.) para o car??ter toler??ncia ao estresse por inunda????o.; Evaluation of genotypes of oat (Avena sativa L.) to the character of tolerance to stress by flooding.

MARINI, Naciele
Fonte: Universidade Federal de Pelotas; Agronomia; Programa de P??s-Gradua????o em Agronomia; UFPel; BR Publicador: Universidade Federal de Pelotas; Agronomia; Programa de P??s-Gradua????o em Agronomia; UFPel; BR
Tipo: Dissertação Formato: application/pdf
POR
Relevância na Pesquisa
56.65%
The white oat crop (Avena sativa L.) has become an important player in the winter cropping system in Southern Brazil and is pointed out as the major alternative for wheat farmers in cropping rotation. Lowland soils of Southern Brazil represent an area of about 5.4 million hectares which are almost exclusively cultivated with rice as a summer crop. The development and yield of other species is harmed by low drainage conditions and lack of oxygen in the soil. Therefore, there is a need to provide alternative crops for winter cultivation in these regions, such as oat cultivars with high adaptation to this environment and, at the same time, with ability to maintain a high grain yield potential. Thus, the goal of this work was to investigate the response of oat cultivars from different breeding programs regarding the tolerance and sensitivity to flooding. Morph physiological characters were measured in order to screen genotypes and to select potential parents for crossing blocks. Forty oat genotypes were subjected to different flooding alternated with draining periods on the greenhouse. The experimental design adopted was random blocks, with three replications, where each observation unit consisted of a pot containing three plants. The results indicate the presence of genetic variability for the character flooding tolerance on greenhouse conditions. Under flooding conditions...

Desempenho da mesa termogradiente e avalia????o de gen??tipos de arroz tolerante ?? baixa temperatura; Performance of the thermogradient table and evaluation of rice genotypes tolerant to low temperature

FREITAS, Dem??crito Amorim Chiesa
Fonte: Universidade Federal de Pelotas; Agronomia; Programa de P??s-gradua????o em Ci??ncia e Tecnologia de Sementes; UFPel; BR Publicador: Universidade Federal de Pelotas; Agronomia; Programa de P??s-gradua????o em Ci??ncia e Tecnologia de Sementes; UFPel; BR
Tipo: Dissertação Formato: application/pdf
POR
Relevância na Pesquisa
46.59%
To evaluate the performance of a thermogradient table in the maintenance of different temperatures and ranking genotypes of rice according to its germination capacity at law temperature. For this procedure it was used a thermogradient table of the Seed Analysis Laboratory of Faculdade de Agronomia Eliseu Maciel of Universidade Federal de Pelotas RS, manufactured in Brazil. Forty genotypes of rice were used, ranking through the determination of the percentage and speed of the germination in four temperatures (10??C, 13??C, 16??C and 19??C) and the behavior of the genotypes in relation to the stress at low temperature. It was concluded that: a) there is great variability among genotypes of rice, as for the tolerance of the germination in low temperature, with emphasis in the following varieties: Colonial, IRGA 418, BR IRGA 411 and EEA 406. b) There are genotypes of rice that present more than 50% of germination in temperature of 10??C up to two weeks after the sowing. c) The thermogradient table is an equipment capable of maintaining stable temperature in each ruler, with a maximum variation of one degree Celsius. d) The thermogradient table allows to manitor the performance of seeds of genotypes of rice, in different temperatures...

Desempenho de gen??tipos de arroz irrigado quanto ao frio na germina????o e na emerg??ncia; Germination and emergence performance of irrigated rice genotypes under cool temperature

FREITAS, Dem??crito Amorim Chiesa
Fonte: Universidade Federal de Pelotas; Agronomia; Programa de P??s-gradua????o em Ci??ncia e Tecnologia de Sementes; UFPel; BR Publicador: Universidade Federal de Pelotas; Agronomia; Programa de P??s-gradua????o em Ci??ncia e Tecnologia de Sementes; UFPel; BR
Tipo: Tese de Doutorado Formato: application/pdf
POR
Relevância na Pesquisa
46.61%
The need to widen the seeding window of irrigated rice cultivars capable of germinating and producing normal seedlings under low soil temperatures led to the execution of this work, at the laboratory of the Plant Science Department from the Faculty of Agronomy Eliseu Maciel , Federal University of Pelotas and greenhouses at Embrapa s Temperate Climate (CPACT - Pelotas/RS) and Rice & Bean (CNPAF - Goi??nia/GO) Experimental Stations. The experimental work focused on the identification of irrigated rice genotypes from an F2 generation tolerant to low soil temperatures at the germination and emergence stages, through the selection of cDNA fragments differentially expressed as the result to low temperature exposure during the germination phase. The procedure consisted of three stages; First stage involved selection, through physiological traits associated to genotype tolerance and sensitivity to germination onset and emergence under low temperature, among the 104 genotypes tested. The Second stage focused on the screening for variability for low temperature tolerance trait among the F2 progeny of a dialellic set of crossings, while the Third stage related to differentially expressed cDNA fragment selection, among embryos from low temperature tolerant and sensitive genotypes. Main results are as follows; a) A large variability for traits expressing tolerance to germination and emergence under low temperatures was determined among the genotypes tested...

Momento de colheita, qualidade fisiol??gica e produtividade de sementes de diferentes gen??tipos de milho; Momento de colheita, qualidade fisiol??gica e produtividade de sementes de diferentes gen??tipos de milho

POSSA, Felipe ??ngelo
Fonte: Universidade Federal de Pelotas; Agronomia; Programa de P??s-gradua????o em Ci??ncia e Tecnologia de Sementes; UFPel; BR Publicador: Universidade Federal de Pelotas; Agronomia; Programa de P??s-gradua????o em Ci??ncia e Tecnologia de Sementes; UFPel; BR
Tipo: Dissertação Formato: application/pdf
POR
Relevância na Pesquisa
56.45%
The quality of seed produced from each seed producing company the main market strategy. Thus, it is important to know the merits of each genotype to identify the best time to harvest. Environmental factors after physiological maturity of seeds are very harmful to the physiological quality, exposing the seeds to deterioration in the field. Were evaluated in this study five corn genotypes for seed production, two hybrids, a modified strain and two inbred lines in two different harvest times. The vigour of the seeds was analized separetaly according to their location in the ear, if the tip or the base. Significant differences for all parameters examined and especially the interaction between the genotype and the force measured by the test cold. It was also shown the differences of vigour depending on the location of the spike and the seed of the harvest season.; Cada empresa produtora de sementes tem na qualidade das sementes produzidas a principal estrat??gia de mercado. Para tanto, ?? importante que conhe??am as caracter??sticas inerentes a cada gen??tipo para identificar a melhor ??poca de colheita. Fatores ambientais ap??s a maturidade fisiol??gica das sementes s??o muito prejudiciais ?? qualidade fisiol??gica, expondo-as ?? deteriora????o de campo. Foram avaliados neste trabalho cinco gen??tipos de milho para produ????o de sementes...

Aspectos fisiol??gicos e bioqu??micos de gen??tipos de aveia branca em resposta ?? salinidade; Physiological and biochemical aspects of white oat genotypes in response to salinity

TIMM, Fabiana Carrett
Fonte: Universidade Federal de Pelotas; Biologia; Programa de P??s-Gradua????o em Fisiologia Vegetal; UFPel; BR Publicador: Universidade Federal de Pelotas; Biologia; Programa de P??s-Gradua????o em Fisiologia Vegetal; UFPel; BR
Tipo: Tese de Doutorado Formato: application/pdf
POR
Relevância na Pesquisa
46.63%
The salinity negatively affects crop productivity due to osmotic and toxic effect caused by excess Na+ and Cl- in the soil. The mechanisms used by tolerant species include the control of Na+ uptake, compartmentalization and translocation of Na+ and Cl- by membrane transporters; production of protective osmolytes, increased activity of antioxidant enzymes and cell signaling. Thus, the objective was to evaluate seed germination and early growth of nine white oat genotypes, in order to identify contrasting genotypes for salt tolerance character. For this analysis was performed on the physiological white oat genotypes under different salt concentrations (0; 25; 50; 75 and 100 mM NaCl). The variables analyzed were: germination, first counting germination, index of germination speed, shoot and root length, shoots and roots dry mass of shoots and roots seedling. Based on these results were selected contrasting genotypes in which it was determined the activity of antioxidant enzymes and content of photosynthetic pigments. Seed germination was less affected than the growth of seedlings with increasing concentrations of NaCl, and the root length was most affected. The length of roots and shoots were the variables that best discriminated contrasting genotypes...

Estresse pela aplica????o de radia????o UV-C e o d??ficit h??drico em gen??tipos de tomate Micro-Tom ; Stress by the application of UV-C and water d??ficit in genotypes of Micro-Tom tomato plants

H??THER, Cristina Moll
Fonte: Universidade Federal de Pelotas; Biologia; Programa de P??s-Gradua????o em Fisiologia Vegetal; UFPel; BR Publicador: Universidade Federal de Pelotas; Biologia; Programa de P??s-Gradua????o em Fisiologia Vegetal; UFPel; BR
Tipo: Tese de Doutorado Formato: application/pdf
POR
Relevância na Pesquisa
46.6%
The objectives of this study were: a. to compare growth and yield components of Micro-Tom tomato plants with wild plants and transformed plants for different levels of MT-sHSP23.6 expression (mitochondrial small heat shock proteins); b. to verify damages caused by UV-C application to photosynthetic activity, in the vegetative and reproductive stages, with the same genotypes previously described; c. to compare the effects of water deficit on photosynthetic activity in Micro-Tom tomato plants with the genotypes reported, in the period of floral induction. The first experiment was carried out in growth chambers, under controlled conditions. The analyses were performed at regular time intervals of 21 days. Collections started on 21st day after the transplant, a total of six collections. Leaf area, dry weight of the plants parts, and the number of green and red fruits were determined. From the results obtained we verified that the genetic transformation of this variety did not interfere significantly with these plants growth. In the second experiment that aimed to evaluate the effect of application of UV-C radiation, two trials were performed; the plants were grown in a green house, under controlled temperature and humidity. In the first trial the application of UV-C radiation was performed only once...

Toler??ncia ?? salinidade avaliada em gen??tipos de arroz, cultivados ex vitro e in vitro; Tolerance to salinity available in rice genotypes cultivated in ex vitro and in vitro

Benitez, Let??cia Carvalho
Fonte: Universidade Federal de Pelotas; Biologia; Programa de P??s-Gradua????o em Fisiologia Vegetal; UFPel; BR Publicador: Universidade Federal de Pelotas; Biologia; Programa de P??s-Gradua????o em Fisiologia Vegetal; UFPel; BR
Tipo: Dissertação Formato: application/pdf
POR
Relevância na Pesquisa
56.57%
Plants under natural conditions are exposed to several environmental stresses which affect their metabolism. Among them, soil salinity is one of the most serious problems in irrigated agriculture. Trying to identify genetic variability for this character, the main goal of this work was to evaluate the germination and the initial development of plantlets of 10 rice genotypes under salt stress. The plantlets were cultivated ex vitro and in vitro, and many morphological characters were used to phenotype their responses. The investigations were performed ex vitro in the greenhouse and in vitro in culture media with NaCl concentrations of 0, 68, 136 and 204 mM added to a nutrient solution and to culture media, respectively. After 21 days from the beginning of each experiment, plantlet emergence and seed germination in vitro were evaluated. Other characters measured were shoot length, number of leaves, leaf area, root length, number of roots and fresh and dry mass of aerial part and radicular system. Analysis of variance, regression fitting, percentage of reduction and dissimilarity analysis were performed. The salinity damages were seen only at the initial phase of germination and plantlet emergence except on 204 mM concentration which was inhibitory to in vitro seed germination. All measured characters had their development reduced in saline substrate. The characters average shoot area...

Variabilidade gen??tica e toler??ncia ao d??ficit h??drico em gen??tipos de batata (Solanum tuberosum L.); Genetic variability and tolerance to water deficit in genotypes of potato (Solanum tuberosum L.)

ROHR, Angela
Fonte: Universidade Federal de Pelotas; Agronomia; Programa de P??s-Gradua????o em Fitomelhoramento; UFPel; BR Publicador: Universidade Federal de Pelotas; Agronomia; Programa de P??s-Gradua????o em Fitomelhoramento; UFPel; BR
Tipo: Dissertação Formato: application/pdf
POR
Relevância na Pesquisa
46.62%
The potato is the third major food crop in the world and is one of the most sensitive species to water deficit. Given the climate change scenario, the cultivation of potatoe is highly threatened, and it is urgent the need to develop varieties adapted to this demand. This work was developed aiming to characterize the genetic structure of the potato germplasm from Embrapa breeding program and to evaluate the response of potato genotypes to water deficit in two growing seasons. To evaluate the genetic structure from potato germplasm, 131 genotypes were characterized with seven SSR loci. The results showed that although the evaluated germplasm has shown a wide and unstructured genetic variability, there is a trend of narrowing the genetic base that is actually being used by the breeding program. To evaluate the response of potato genotypes to drought stress, 12 genotypes were evaluated in two seasons, spring and fall, in hydroponic culture using polyethyleneglycol to simulate a water deficit of -0.129 MPa. The genotypes were evaluated with respect to various morphological and agronomic characters, such as root and shoot dry weight as well as number of tubers produced per plant. Based on the results of this work can be seen that the potato genotypes respond differently to drought stress depending on the growing season that it is cultivated...

Resposta de gen??tipos de arroz (Oryza sativa L.) ao estresse por ??cidos org??nicos sob condi????es de ambiente controlado; Organic acid related stress responses in rice (Oryza sativa L.) genotypes under ambient controlled conditions

KOPP, Mauricio Marini
Fonte: Universidade Federal de Pelotas; Agronomia; Programa de P??s-Gradua????o em Fitomelhoramento; UFPel; BR Publicador: Universidade Federal de Pelotas; Agronomia; Programa de P??s-Gradua????o em Fitomelhoramento; UFPel; BR
Tipo: Tese de Doutorado Formato: application/pdf
POR
Relevância na Pesquisa
56.71%
Hydromorphic soils present as main feature a reduced natural drainage ability, being mostly used for growing irrigated rice. Thus, the occurrence of anaerobic conditions associated to the presence of organic matter enables the development of anaerobic microorganisms which, while decomposing the organic matter, generate phytotoxic substances represented mainly by short chain aliphatic organic acids. The selection of promising genotypes adapted for use in these situations requires complicated field evaluations, which can be simulated under hydroponic culture. The research was composed of four articles that had as major goals to establish an adequate methodology for growing rice under organic acid rich hydroponic culture. The first work aimed at determining the range of concentrations and response variables most indicated for evaluating rice genotypes under hydroponics. The effects of six different concentrations for the three major acids formed in the soil: acetic (0; 4; 8; 12; 16 and 20 mM), propionic (0; 3; 6; 9; 12 and 15 mM) and butyric (0; 2; 4; 6; 8 and 10 mM) acids in two genotypes of high divergence (BRS 7-TAIM and SAIBAN). The results indicated that the most adequate concentration range for organic acid studies in rice are between 15.8 and 8.4; 9.1 and 4.2 and 7.7 and 3.7 mM for acetic...

Progresso gen??tico na sele????o de gen??tipos de trigo com base na express??o do car??ter n??mero de afilhos; Genetic progress in the selection of wheat genotypes for tiller number.

VAL??RIO, Igor Pirez
Fonte: Universidade Federal de Pelotas; Agronomia; Programa de P??s-Gradua????o em Fitomelhoramento; UFPel; BR Publicador: Universidade Federal de Pelotas; Agronomia; Programa de P??s-Gradua????o em Fitomelhoramento; UFPel; BR
Tipo: Tese de Doutorado Formato: application/pdf
POR
Relevância na Pesquisa
46.59%
Many selection strategies have contributed for the continuous progress in wheat breeding programs. On the other hand, the main yield component (number of fertile tillers), has still been underexploited. In this sense, in order to investigate this issue, this work was planned to report the state of the art processes involved in tiller production and development. This information was crucial to the design of the next experiments on genotypes contrasting for tiller number and their response in segregating generations, when subjected to artificial crosses. The seeding density influences greatly grain yield, since it is directly related to fertile tiller production potential, and has a direct effect on number of ears per unit area. Likewise, the genotype and environment effects were important for the adjustment of seeding density and maximum yield obtained. It is essential that the best seeding rate be found for a given genotype at a given location. Genotypes with reduced tillering potential, revealed a larger buffering effect. However, only at seeding density higher than 400 seeds m-2. The genotypes with high tillering potential revealed the best grain production performance at low seeding density. However, these genotypes have a long developing cycle...

Recursos gen??ticos de arroz (Oryza sativa L.) no sul do Brasil.; Rice genetic resources (Oryza sativa L.) in southern Brazil.

MAGALH??ES J??NIOR, Ariano Martins de
Fonte: Universidade Federal de Pelotas; Agronomia; Programa de P??s-Gradua????o em Fitomelhoramento; UFPel; BR Publicador: Universidade Federal de Pelotas; Agronomia; Programa de P??s-Gradua????o em Fitomelhoramento; UFPel; BR
Tipo: Tese de Doutorado Formato: application/pdf
POR
Relevância na Pesquisa
46.6%
The worldwide adaptability of rice, allied to constant research efforts, reassures its grain a place among the major staple foods for humankind. The influence of natural selection resulted in a wide diversity in the Oryza genus, which is currently composed by 23 species. On the other hand, only O. sativa L. (asian cultivated rice) and O. glaberrima (african cultivated rice) have been used for human consumption, therefore, subjected to artificial selection. The process of domestication in rice has selected important agronomic characters for better plant performance in specific environments, resulting in a bottleneck effect on the genetic diversity. This effect makes a change in the initial gene pool, keeping some selected genes and eliminating others. Thus, the objective of this work was to amplify the genetic basis of rice in southern Brazil, through collections and introductions, characterization of accessions and estimation of genetic distances between accessions. The results revealed a limited number of rice landraces in the state of Rio Grande do Sul. These landraces are found in small farms that still keep these genotypes for their own consumption. A large area of the state is cultivated with modern phillipine-type varieties. However...

Viabilidade e compatibilidade de p??len de diferentes gen??tipos de pereira no Rio Grande do Sul; Pollen viability and compatibility of different genotipes of the pear culture in the state of Rio Grande do Sul.

GON??ALVES, Ciane Xavier
Fonte: Universidade Federal de Pelotas; Agronomia; Programa de P??s-Gradua????o em Fruticultura de Clima Temperado; UFPel; BR Publicador: Universidade Federal de Pelotas; Agronomia; Programa de P??s-Gradua????o em Fruticultura de Clima Temperado; UFPel; BR
Tipo: Dissertação Formato: application/pdf
POR
Relevância na Pesquisa
46.71%
Pear is a fruit tree that belongs to the family Rosaceae, subfamily Pomoideae and genus Pyrus. In Brazil, the pear production lays around 20 thousand ton, and this fact occurs mainly due to the lack of adapted cultivars to the climate conditions.The present work was developed with the objective to study the pollen viability and compatibility of different cultivars, selections and rootstocks for the pear culture. This work was divided into five batches: in the experiment 1 it was evaluated the in vitro germination of 14 genotypes of pear at different incubation times (2, 4 and 6 hours) in BOD incubator and in lightless condition at 25??C. In the experiment 2, the incubation time was set for each genotype according the best results obtained in the previous experiment and it was assessed different temperatures of incubation (20, 30 and 40 ??C) on in vitro germination of 14 pear genotypes. The basic germination medium consisted of 100 g L-1 sucrose and 10 g L-1 agar. In the third experiment, time and temperature of in vitro incubation of the pollen grains were chosen conform to the previous experiments. It was evaluated the germination of ten pear genotypes under the influence of the increase of different combinations of boric acid and calcium nitrate to the basic germination medium. In the experiment 4 it was assessed the in vitro germination of pollen grains of pear genotypes (varying temperature and time of incubation) in BOD incubator...

Desempenho agron??mico de gen??tipos de cana-de-a????car no Estado do Rio Grande do Sul.; Agronomic performance of sugarcane genotypes in Rio Grande do Sul State.

VER??SSIMO, Mario Alvaro Aloisio
Fonte: Universidade Federal de Pelotas; Agricultura familiar; Programa de P??s-Gradua????o em Sistemas de Produ????o Agr??cola Familiar; UFPel; BR Publicador: Universidade Federal de Pelotas; Agricultura familiar; Programa de P??s-Gradua????o em Sistemas de Produ????o Agr??cola Familiar; UFPel; BR
Tipo: Dissertação Formato: application/pdf
POR
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Brazil is the world leader in the production of sugarcane. This crop is of great importance to Brazil and to Rio Grande do Sul State, where the family farming has the largest area planted with sugarcane. There is increasing demand for technical information about the sugarcane cultivation in this State, with the aim at ethanol production. Genotype x environment interaction is one of the main factors to be evaluated in the development of the production systems. The objective of this research was to evaluate the agronomic performance of sugarcane genotypes in different environments of the Rio Grande do Sul State. The characters tons of stalks per hectare (TCH), tons of Brix per hectare (TBH), maturation, disease occurrence and cold tolerance of sugarcane genotypes were evaluated. Adaptability and stability was evaluated by methodology AMMI (Additive Main Effects and Multiplicative Interaction), based on the variables TBH and TCH. The results indicate that the genotype x environment interaction is significant, with genotypes broadly adapted and stable, as well as behavior specific genotypes to particular environments. Diseases such as brown rust, smut, leaf scald and red stripe incidence and striations were regionalized. The brown spot (Cercospora longipes) showed wide occurrence with high severity for some genotypes in certain environments. Regarding the cold tolerance...

Caracteriza??o molecular dos gen?tipos G e P de rotav?rus tipo G9 provenientes de crian?as com gastrenterite aguda na regi?o metropolitana de Bel?m, Par?, no per?odo de 1999 a 2007

GUERRA, Sylvia de F?tima dos Santos
Fonte: Universidade Federal do Pará Publicador: Universidade Federal do Pará
Tipo: Dissertação de Mestrado
POR
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O rotav?rus (RV) ? o principal agente viral associado ?s gastrenterites, ocasionando em m?dia 39% dos casos diarreicos que culminam em hospitaliza??es, sendo respons?vel por cerca de 520.000 ?bitos entre crian?as menores de cinco anos de idade a cada ano. Pertencem ? fam?lia Reoviridae, g?nero Rotavirus, possui RNA de dupla fita (dsRNA) com 11 segmentos codificando 12 prote?nas, sendo seis estruturais (VPs) e seis n?o estruturais (NSPs). A prote?na VP4, juntamente com a VP7, comp?em a camada externa do RV, designando os gen?tipos P e G, respectivamente. At? o momento foram descritos 23 tipos G e 31 tipos P. O gen?tipo G9 emergiu em escala global e ? possivelmente associado a manifesta??o cl?nica mais grave, estando geralmente acompanhado do gen?tipo P[8]. O gen?tipo G9 possui 6 linhagens distintas e o P[8] 4 linhagens. Este estudo objetivou caracterizar os genes VP7 e VP4 de RV do gen?tipo G9, circulantes na regi?o metropolitana de Bel?m, Par?, no per?odo de 1999 a 2007. O dsRNA viral de 38 amostras selecionadas foi extra?do a partir das suspens?es fecais e submetido ? eletroforese em gel de poliacrilamida para determina??o dos eletroferotipos, seguido da rea??o de seq?enciamento. Na presente investiga??o, foi poss?vel a an?lise de 32 amostras selecionadas...

Padr?o de crescimento, par?metros de desempenho e diverg?ncia gen?tica de gen?tipos de frangos tipo caipira; Growth pattern, performance parameters and genetic divergence of genotypes in Alternative strain of Broiler Chickens

Veloso, Rog?rio de Carvalho
Fonte: UFVJM Publicador: UFVJM
Tipo: Dissertação de Mestrado
POR
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Objetivou-se com este trabalho comparar o padr?o de crescimento, avaliar o desempenho, as caracter?sticas de carca?a e, verificar a diverg?ncia gen?tica por meio de t?cnicas de an?lise multivariada de diferentes gen?tipos de aves tipo caipira. Foram utilizados 840 pintos de um dia, machos, distribu?dos em delineamento inteiramente casualizado, dos seguintes gen?tipos: Caboclo, Carij?, Colorpak, Gigante Negro, Pesad?o Vermelho, Pesco?o Pelado e Tricolor. Para a determina??o das curvas de crescimento do peso corporal das aves, os dados coletados foram avaliados a partir dos modelos n?o-lineares: Brody, Gompertz, Log?stico, Richards e von Bertalanffy. Foi empregado o ?proc nlin? do SAS, utilizando o m?todo interativo de Gauss-Newton. Os crit?rios utilizados para escolha do modelo de melhor ajuste da curva de crescimento foram o coeficiente de determina??o, o desvio padr?o assint?tico, o desvio m?dio absoluto dos res?duos e o ?ndice assint?tico. O estudo do crescimento relativo dos cortes foi realizado mediante o modelo da equa??o alom?trica de Huxley. As caracter?sticas de desempenho (convers?o alimentar, ganho em peso m?dio di?rio, consumo de ra??o m?dio di?rio) foram avaliadas em quatro per?odos: 1 a 28, 1 a 56, 1 a 70 e 1 a 84 dias de idade. As caracter?sticas de carca?a (peso e rendimento de carca?a...