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| Registros recuperados: 204 | |
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| Megia Vera, Héctor Javier. |
| El presente estudio se realizó con el objetivo de Identificar y seleccionar una Unidad Producctora de Germoplasma Forestal de Caoba (Swietenia macrophylla King) en la UMAF-2702ST Sierra de Tenosique Tabasco, donde se seleccionaron árboles de caoba con características fenotípicas deseables. A cada árbol se le midió: altura (At, m), diámetro (DAP, cm), longitud de la copa (Lc, m), rectitud del fuste (R) y sanidad (S), se realizó un análisis estadístico descriptivo, uno de componentes principales (ACP) y una correlación entre At y DAP con la R. La obtención de las dimensiones de la semilla (largo y ancho) se realizó a través de las herramientas del software del equipo de Rayos-X Faxitron (MX-20, Faxitron X-ray Corporation, Wheeling, IL, USA), calibrado a 120... |
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Palavras-chave: Germoplasma; Variación; Selección; Fenotípica; Germinación; Germplasm variation; Selection; Phenotypic germination; Producción Agroalimentaria en el Trópico; Maestría. |
| Ano: 2012 |
URL: http://hdl.handle.net/10521/1748 |
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| Viana,José Marcelo Soriano. |
| Although epistasis is common in gene systems that determine quantitative traits, it is usually not possible to estimate the epistatic components of genotypic variance because experiments in breeding programs include only one type of progeny. As the study of this phenomenon is complex, there is a lack of theoretical knowledge on the contribution of the epistatic variances when predicting gains from selection and on the bias in estimating genetic parameters when fitting the additive-dominant model. The objective of this paper is to discuss these aspects. Regarding a non-inbred population, the genetic value due to dominance and the epistatic components of the genotypic value are not indicators of the number of favorable genes present in an individual. Thus,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Breeding; Genetic parameters; Gene interaction; Selection. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572005000100012 |
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| Kohn,Michael H.. |
| While it remains a matter of some debate, rapid sequence evolution of the coding sequences of duplicate genes is characteristic for early phases past duplication, but long established duplicates generally evolve under constraint, much like the rest of the coding genome. As for coding sequences, it may be possible to infer evolutionary rate, selection, and constraint via contrasts between duplicate gene divergence in the 5 prime regions and in the corresponding synonymous site divergence in the coding regions. Finding elevated rates for the 5 prime regions of duplicated genes, in addition to the coding regions, would enable statements regarding the early processes of duplicate gene evolution. Here, 1 kb of each of the 5 prime regulatory regions of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Gene duplication; Gene expression; Selection; Promoter evolution. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572008000300028 |
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| Ribeiro,Claudia SC; Soares,Renato S; Gomes,Lucas M; Coelho,Lucas GF; Reifschneider,Francisco JB. |
| ABSTRACT Few Calabrian pepper cultivars (C. annuum and C. baccatum) are available in the Brazilian market, and among these, only BRS Mari (C. baccatum) was developed in Brazil, by Embrapa. This work aimed to report on the introduction of germplasm in a sui generis way and the initial results of Calabrian pepper breeding at Embrapa Vegetables. Original population was obtained through separation of seeds found in dehydrated Calabrian pepper flakes imported from India. The breeding method was individual selection of plants with progeny test and three generations of selection and self-pollination were advanced. Ten plants were obtained from the original seeds, which were self-pollinated and originated 87 S1 plants. Out of these, seeds of 73 S1 plants were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Capsicum annuum; Selection; Pepper flakes; Pepperoncino.. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362017000200195 |
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| Sales Júnior,Rui; Nunes,Glauber HS; Michereff,Sami J; Pereira,Elaíne WL; Guimarães,Izabel M. |
| Powdery mildew, caused by Podosphaera xanthii, is an important disease of melon in the Brazilian Northeast. The objective of this work was to evaluate the reaction of families, lines and cultivars of melon to P. xanthii. Two experiments in simple lattice were carried out under field conditions in the municipalities of Mossoró and Baraúna to evaluate 144 families. In a greenhouse, an experiment was carried out in a completely randomized design to evaluate 19 lines and the cultivars Yellow Queen, Chilton and Hy Mark. Disease was assessed by a severity scale. There was genetic variability among families. The families 4, 5, 11, 14, 18, 23, 33, 42, 101, 112 and 140 were identified in both sites as resistant. The lines LOF-027, LOF-105, LPS-124, MEL-008 and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cucumis melo; Podosphaera xanthii; Powdery mildew; Resistance; Selection. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362011000300021 |
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| Silva,Giovani Olegario da; Pereira,Arione da S; Carvalho,Agnaldo DF; Azevedo,Fernanda Q. |
| ABSTRACT The objective of this research was to evaluate advanced potato clones for tuber yield, frying quality, plant vigor, and maturity, grown from minituber seeds, and to assess correlations between these traits. Eight advanced potato clones of Embrapa Potato Breeding Program (F11-09-03, F05-11-03, F54-11-06, F141-11-01, C2718-12-09, C2718-24-09, C2743-09-09, and CL308) and three commercial cultivars (Agata, Asterix and BRSIPR Bel) were evaluated. Experiments were carried out in autumn 2017, in Canoinhas-SC and Pelotas-RS. A randomized complete block design with four replicates was used. We used tuber seeds type IV (minibubers). We evaluated plant vigor, maturity, yield and number of marketable tubers, yield and number of total tubers, average tuber... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Solanum tuberosum; Breeding; Selection. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362019000100095 |
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| AZEVEDO, C. P. de; LIMA, R. M. B. de; NEVES, E. J. M.. |
| Selecao de especies nativas e/ou exoticas com potencial para produzir lenha e derivados, e estudar tecnicas de manejo adequadas para a implantacao de sistemas de producao de lenha em plantios ordenados, por meio de testes de 12 especies (Acacia angustisima, A. auriculiformes, A. mangium, Albizia lebeck, Calliandra houstiniana, C. callothyrsus, Gmelina arborea, Inga edulis, Leucaena leucocephala, Ormosia sp., Piranhea trifoliata, Tachigalia sp.). Quanto ao crescimento em altura e biomassa, A. auriculiformes, A. mangium e G. arborea tiveram medias estatisticamente iguais e superiores as demais; I. edulis tambem apresentou crescimento satisfatorio. Em relacao ao crescimento diametrico, as especies apresentaram comportamento semente ao desempenho em altura,... |
| Tipo: Séries anteriores (INFOTECA-E) |
Palavras-chave: Acacia angustissima; Acacia auriculiformes; Albizia lebeck; Calliandra callothyrsus; Calliandra houstiniana; Leucena; Tento acai; Piranhea trifoliata; Piranheira; Tachigalia; Taxi vermelho; Brasil; Amazonas; Manaus; Iranduba; Selection; Management.; Acácia; Ingá Edulis; Gmelina Arbórea; Essência Florestal; Espécie; Gmelina; Ingá; Leucaena Leucocephala; Manejo; Seleção.; Albizia; Acacia mangium; Ormosia; Forest trees.. |
| Ano: 1998 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/666482 |
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| SANTOS, M. X. dos; TIMOTEO SOBRINHO, A.; QUEIROZ, M. A. de; MELO, J. N. de; NASPOLINI FILHO, V.. |
| A introdução da cultivar Centralmex no Nordeste foi efetuada em 1973, para início de um programa de melhoramento para a região. A metodologia adotada no decorrer do processo seletivo foi a seleção massal estratificada. Os principais atributos agronômicos considerados foram coloração dos grãos e produção, realizando-se, também, a seleção para redução do porte da planta, bom empalhamento e sanidade das espigas. Após oito ciclos de seleção, constatou-se uma modificação acentuada na coloração dos grãos, passando de amarelo-esbranquicado para amarelo-ouro. Nos anos em que foi testado em ensaios de produção, o meterial mostrou produtividades médias superiores ou equivalentes a hibridos comerciais oriundos do Sul do Pais. Os ganhos relativos apresentados... |
| Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E) |
Palavras-chave: Variedade Centralmex; Estratificação; Brasil; Nordeste; Variety; Selection; Stratified; Northeast; Cultivo.; Milho; Seleção; Zea Mays.; Corn; Brazil.. |
| Ano: 1981 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/133173 |
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| Registros recuperados: 204 | |
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