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| Registros recuperados: 204 | |
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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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| 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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| Martuscello,Janaina Azevedo; Braz,Thiago Gomes dos Santos; Jank,Liana; Cunha,Daniel de Noronha Figueiredo Vieira da; Souza,Madson Williame Melo; Brito,Gerlane Ferreira de; Oliveira,Leandro Pereira de. |
| This experiment was carried out with the objectives of determining repeatability coefficients, the number of harvests necessary to increase accuracy and the genotypic stability of yield characteristics in Brachiaria brizantha cultivars in the northeast region of Brazil in the period from July 2009 to March 2011. The experimental design used was completely randomized with three treatments (Brachiaria brizantha var. Marandu, Xaraés and Piatã) and three replications. Each plot was harvested seven times: five in the rainy season and two in the dry season. Immediately after each harvest, the forage was weighed and dried to obtain total, stem, leaf and dead dry matter yields. For the estimation of the repeatability coefficient, analysis of variance, principal... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Forage breeding; Forage production; Selection. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982013000100005 |
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| Silva,Hudsonkléio Da Costa; Anunciação Filho,Clodoaldo José; Bastos,Gerson Quirino; Dutra Filho,João Andrade; Simões Neto,Djalma Euzébio. |
| ABSTRACT In commercial cultivation of sugarcane, knowledge about the repetition of agroindustrial characters is essential to identify long-lived genotypes in production cycles, which when selected, will contribute to the significant increase in productivity. This work evaluated the agroindustrial performance of 16 sugarcane genotypes in the sugarcane microregion Litoral Norte of Pernambuco in four harvest cycles and the regularity in the repetition of characters. The experiment was conducted in the agricultural area of São José sugar mill, Igarassu, state of Pernambuco, Brazil. The experiment was carried out following a randomized block design with four replications. The variables evaluated were: tons of POL per hectare (TPH), tons of cane per hectare... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Longevity; Productivity; Repetition of characters; Selection; Saccharum spp. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902018000200275 |
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| Silva, Ricardo Gonçalves; UFMA; Chaves, Maria da Cruz Lima; Agência Estadual de Pesquisa Agropecuária e Extensão Rural do Maranhão; Arnhold, Emmanuel; UFMA; Cruz, Cosme Damião; UFV. |
| O objetivo deste trabalho foi estimar parâmetros de repetibilidade e correlações fenotípicas em caracteres do fruto do bacuri (Platonia insignis Mart.). Foram avaliadas seis matrizes (genótipos) localizadas em seis municípios do Estado do Maranhão. Oito frutos foram colhidos por matriz, sendo mensurados diâmetro, comprimento, cavidade interna, peso e número de sementes por fruto, espessura da casca, peso de casca mais semente, rendimento de polpa, número de segmentos partenocárpico, Brix e acidez total titulável. Os dados foram submetidos à análise de variância. Os genótipos apresentaram variabilidade genética significativa para todos os caracteres, em nível de 1% de probabilidade pelo teste F. Apenas para cavidade interna do fruto, acidez total titulável... |
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Palavras-chave: 5.02.01.03-4 Genética e Melhoramento Florestal variância genética; Variância ambiental; Herdabilidade; Seleção 5.00.00.00-4 Ciências Agrárias; 5.01.00.00-9 Agronomia; 5.01.03.00-8 Fitotecnia; 5.01.03.05-9 Melhoramento Vegetal; Genetic variance; Environmental variance; Heritability; Selection. |
| Ano: 2009 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/723 |
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| Lucila Sobrinho,T.; Branco,R.H.; Bonilha,S.F.M.; Castilhos,A.M.; Figueiredo,L.A.; Razook,A.G.; Mercadante,M.E.Z.. |
| The objective of this work was to evaluate performance, efficiency parameters and phenotypic correlations among measurements of energy efficiency of Nellore cattle selected for post weaning weight and classified according to residual feed intake, calculated by the difference between observed and predicted intake, based on average metabolic body weight and average daily gain. Thus, animals were classified within three groups: high (> mean + 0.5 standard deviation, less efficient); medium (±0.5 standard deviation of the mean); and low (< mean - 0.5 standard deviation, more efficient) residual feed intake. No differences were observed at initial and final body weights, average daily gain and dry matter intake among groups. Animals with low residual... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Beef cattle; Efficiency parameters; Selection. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011000400030 |
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| Invernizzi,C; Rivas,F; Bettucci,L. |
| Chalkbrood disease affects the larvae of honeybees Apis mellifera L. and is caused by the fungus Ascosphaera apis. Infected larvae die when they are stretched in the cap cell and suffer a gradual hardening that ends in a very hard structure (mummie). Several studies have demonstrated that colonies that express an efficient hygienic behaviour (uncapping of cell and subsequent removal of dead brood) exhibit a higher resistance to the disease. However, it remains unclear whether the advantage of hygienic colonies over less hygienic ones lies in the ability to remove mummies or in the early detection of infected larvae and its cannibalization before they harden. To elucidate this aspect, the hygienic behaviour of 24 colonies, which were subsequently provided... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Honey bee; Ascosphaera apis; Larva; Selection. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2011000100004 |
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| Degremont, Lionel; Maurouard, Elise; Rabiller, Manuella; Glize, Philippe. |
| Massive spring mortality outbreaks have been reported in Mytilus spp. in France since 2014. The main areas affected are the Pertuis Charentais Sounds and the coast of the Pays de la Loire, which cultivate mainly M. edulis, and the putative causal agents remain unknown. We report the results of the first generation of mass selection focused on survival and resistance to the spring mortality in M. edulis. Two stocks of mussels were sampled in the Pertuis Charentais Sounds in 2014; one of these went through a spring mortality outbreak and the survivors were used to produce the selected stock, while the second stock was M. edulis considered to be naïve against the putative causal agents of the mortality outbreak and was used to produce the control stock. A... |
| Tipo: Text |
Palavras-chave: Spring mortality; Survival; Mytilus edulis; Heritability; Selection. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00505/61619/65530.pdf |
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| Registros recuperados: 204 | |
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