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Analise quantitativa da selecao envolvendo progenies de milho (Zea mays L.) em solos sob cerrado e fertil. I. Progressos geneticos. Repositório Alice
RESENDE, M. D. V.de; SOUZA JUNIOR, C. L. de; GAMA, E. E. G. e; MAGNAVACA, R..
Este trabalho relata resultados da avaliacao de progenies de meios-irmaos da variedade de milho BR 108 em solos sob cerrado e fertil. As magnitudes das estimativas das variancias genetica aditivas mostraram que a variabilidade genetica no cerrado, quanto ao carater peso de espigas, apresentou-se baixa em relacao a verificada no fertil, enquanto que no tocante a indice de espigas mostrou-se nula. As magnitudes das estimativas da interacao progenies x ambiente apresentaram-se despreziveis em relacao a altura da planta e da espiga, a dias para florescimento e a indice de espigas, mas mostrou-se elevada para peso de espigas, revelando baixa correlacao entre medias de progenies nos dois ambientes. Os ganhos geneticos revelaram que no tocante a peso de espigas...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Interacao genotipo x ambiente; Parametro genetico; Solo acido; Resposta a selecao; Genotype x environment interaction; Genetic parameters; Acid soils; Selection response.
Ano: 1997 URL: http://www.alice.cnptia.embrapa.br/handle/doc/85792
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Genetic variation for growth at one and two summers of age in the common carp (Cyprinus carpio L.): Heritability estimates and response to selection ArchiMer
Vandeputte, Marc; Kocour, M; Mauger, S; Rodina, M; Launay, A; Gela, D; Dupont Nivet, M; Hulak, M; Linhart, O.
We estimated the heritability of growth-related traits (weight and length at ages one summer, first spring and two summers) in a synthetic mirror carp strain (HSM) in the Czech Republic. The four generation pedigree was obtained from parentage assignment of three factorial mating designs with microsatellite markers, and included 195 fish without phenotypes (48 G0, 147 G1) and 1321 fish with phenotypes (674 G2, 647 G3). Animal model heritability estimates over generations were in the range 0.21-0.33 for length and in the range 0.31-0.44 for weight. The genetic correlation between length and weight was high (0.97). The correlations between growth measurements in the first and in the second summer of age were moderate to low (0.34-0.67). Divergent selection...
Tipo: Text Palavras-chave: Quantitative genetics; Performance; Microsatellites; Parentage assignment; Realized heritability; Selection response; Selection; Growth; Heritability; Cyprinus carpio; Common carp.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-4076.pdf
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Mass selection for survival and resistance to OsHV-1 infection in Crassostrea gigas spat in field conditions: response to selection after four generations ArchiMer
Degremont, Lionel; Nourry, Max; Maurouard, Elise.
The ostreid herpesvirus 1 (OsHV-1) is one of the major pathogens affecting the Pacific oyster Crassostrea gigas, and numerous mortality outbreaks have been observed worldwide. We report the first results of our experimental breeding program using mass selection focused on survival and resistance to OsHV-1 after four generations of selection for two lines. These lines originated from two stocks of adult wild oysters sampled from the Marennes-Oléron Bay in 2008. Each line was spawned in February 2009 to produce the base populations. Both lines were then either protected from OsHV-1 or tested in the field in 2009 where they were exposed to OsHV-1. For each line during 2010 to 2013, one generation per year was produced using either the survivors of the...
Tipo: Text Palavras-chave: Survival; Crassostrea gigas; Realized heritability; Selection response; OsHV-1; Disease resistance.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00266/37751/36064.pdf
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Response to domestication and selection for growth in the European sea bass (Dicentrarchus labrax) in separate and mixed tanks ArchiMer
Vandeputte, Marc; Dupont Nivet, M; Haffray, P; Chavanne, H; Cenadelli, S; Parati, K; Vidal, Marie-odile; Vergnet, Alain; Chatain, Beatrice.
Selective breeding of European sea bass (Dicentrarchus labrax) receives a growing interest, as the estimated heritability of growth is medium to high. In this study, we compared the offspring of four groups of sea bass sires, mated with the same wild dams: wild (W), first generation of domestication (D), first generation of mass selection for length (M), first generation of PROSPER-like selection for length (P). The comparison was done both in replicated tanks (separate rearing) and in mixed tanks (mixed rearing) where sire origins were recovered by genotyping of eight microsatellite markers. Weight, length and growth rate were measured from day 238 post-fertilization (69 g mean weight) to day 611 post-fertilization (390 g mean weight). Both in mixed and...
Tipo: Text Palavras-chave: Nephrocalcinosis; Competition; Microsatellites; Parentage assignment; Realized heritability; Selection response; Growth; Selective breeding; Dicentrarchus labrax; European sea bass.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-5303.pdf
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Valoración del mejoramiento genético participativo in situ en poblaciones de maíz (Zea mays L.) criollo en el sureste del Estado de México. Colegio de Postgraduados
Zambrano Zambrano, Eddie Ely.
La selección de semilla es un proceso ancestral y cotidiano en el cultivo de poblaciones de maíz nativo (criollo); se ha planteado que mediante el fortalecimiento de ese proceso con elementos técnicos del mejoramiento genético se puede conservar la diversidad genética del maíz y acrecentar el potencial productivo. De aplicarse de manera generalizada, se impactaría en el minifundio y en más del 80% de la superficie cultivada con maíz en México (8.5 millones de hectáreas). En el área de Genética del Colegio de Postgraduados se ha practicado mejoramiento participativo desde 1995, mediante selección masal in situ en poblaciones de maíz nativo con agricultores del sureste del Estado de México. En las localidades de Montecillo y Ayapango, Estado de México,...
Palavras-chave: Zea mays; Riqueza genética; Mejoramiento participativo; Respuesta a la selección; Polimorfismo isoenzimático; Genetic diversity; Participatory genetic improvement; Selection response; Isoenzyme polimorphism; Genética; Maestría.
Ano: 2013 URL: http://hdl.handle.net/10521/1863
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