|
|
|
| Registros recuperados: 107 | |
|
|
| Artiles, A.; Rodríguez, I.; Pérez, A.; Pérez, L.; Espinosa, G.. |
| The present work estimated the genetic variability and relatedness index of the fifth stock of Pacific white shrimp, Litopenaeus vannamei, imported into Cuba for farming purposes from the US Shrimp Improvement System (SIS). Ge- netic variability was estimated by genotyping 33 samples for four microsatellite loci: M1, Pvan 1815, Pvan 0040 and Pvan 1758. This stock had average expected and observed heterozygosities of 0.37 and 0.27 respectively; the lowest of all stocks previously introduced in Cuba. The above, together with the low amount of allelic variants detected for each microsatellite, was suggestive of low genetic variability. In addition, pairwise relatedness coefficients clustered around unity, indicating a high degree of consanguinity. Taken... |
| Tipo: Journal Contribution |
Palavras-chave: Genetic variation; Shrimp culture. |
| Ano: 2011 |
URL: http://hdl.handle.net/1834/5348 |
| |
|
|
| Artiles, A.; Rodríguez, I.; Pérez, A.; Pérez, L.; Espinosa, G.. |
| Se estimó la variabilidad genética y el índice de parentesco entre lotes de camarón blanco del Pacífico, Litopenaeus vannamei, introducidos por quinta ocasión en Cuba, procedentes del Centro de mejora del camarón, de Estados Unidos (Shrimp Improving System: SIS), para su cultivo. La variabilidad genética se estimó mediante el genotipo de 33 muestras con cuatro loci microsatélites: M1, Pvan 1815, Pvan 0040 y Pvan 1758. El quinto lote de Litopenaeus vannamei tuvo los valores promedios de heterocigosidad esperada y observada, más bajos de todos los introduci- dos en Cuba: 0.37 y 0.27, respectivamente. Esto, unido a la poca cantidad de variantes alélicas para cada región microsatélite, indica una escasa variabilidad genética. Los valores del coeficiente... |
| Tipo: Journal Contribution |
Palavras-chave: Genetic variation. |
| Ano: 2011 |
URL: http://hdl.handle.net/1834/5346 |
| |
|
|
| Fassatoui, Ch.; Romdhane, M.S.. |
| La variabilité génétique entre les classes d’âge du pageot commun, Pagellus erythrinus (Linnaeus, 1758 ; Sparidae) a été appréhendée par une analyse isoenzymatique. L’étude aà été portée sur 251 spécimens des côtes Nord de la Tunisie. L’âge des poissons a été estimé indirectement par analyse otolithométrique. Les quatorze systèmes enzymatiques utilisés sont codés par 21 loci dont 10 sont polymorphes au seuil de 99%. Le taux d’hétérozygotie attendu non biaisé moyen (Hnb = 0,048) est comparable à celui rapporté chez les espèces ichtyologiques, notamment les Sparidés. La vérification de l’équilibre de Hardy-Weinberg montre un écart significatif à la panmixie dans le sens d’un déficit en Hétérozygotes (FIS = 0,116, p < 0,001). L’indice de diversité... |
| Tipo: Journal Contribution |
Palavras-chave: Genetic variation; Allozymes; Seabream fisheries. |
| Ano: 2010 |
URL: http://hdl.handle.net/1834/4689 |
| |
|
| |
|
| |
|
| |
|
| |
|
| |
|
| |
|
| |
|
| |
|
| |
|
| |
|
|
| Bassoi,Manoel Carlos; Flintham,John; Riede,Carlos Roberto. |
| The objective of this work was to evaluate the possibility of obtaining recombinant inbred wheat lines more resistant to preharvest sprouting, independently of colour genes, in three red-grained Brazilian wheat populations. The results showed statistical significance among lines within all populations, which presented a normal distribution and transgressive segregation for preharvest sprouting. The normal distribution of the lines from all red-grained populations suggests that sprouting, excluding the genes expressing seed coat pigmentation, is, probably, controlled by many genes. These findings also indicate that it may be possible to improve resistance to preharvest sprouting, independently of the colour genes. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Triticum aestivum; Dormancy; Grain colour; Genes; Genetic variation. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2006000400006 |
| |
|
| |
|
|
| Rocha,Beatriz Helena Gomes; Augustin,Eliane; Silva,João Baptista da; Viégas,Judith. |
| Two species of wild potato Solanum commersonii, subspecies commersonii and malmeanum, and S. chacoense, subspecies muelleri occur in southern Brazil. Their rusticity and easy adaptation to extreme climatic conditions make them valuable for breeding programs. The objective of this work was to analyze the isoenzymatic variability of 113 clones of wild potato subspecies. They were collected and maintained at Embrapa-Centro de Pesquisa Agropecuária de Clima Temperado, at Pelotas, RS, Brazil. Enzymes involved in energetic (group I) or in peripherical (group II) metabolism constituted the material used. Polyacrylamide horizontal gel electrophoresis was used to analyze peroxidase, aspartate transaminase, phosphoglucomutase and isocitrate dehydrogenase isoenzymes.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Peroxidases; Aminotransferases; Isomerases; Isocitrate dehydrogenase; Genetic variation. |
| Ano: 2001 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2001000500008 |
| |
|
| |
|
| |
|
|
| Vacaro,Elton; Barbosa Neto,José Fernandes; Pegoraro,Diego Girardi; Nuss,Claudio Natalino; Conceição,Leo Duc Haa. |
| Genetic progress depends on germplasm quality and breeding methods. Twelve maize populations and their crosses were evaluated to estimate combining ability and potential to be included as source populations in breeding programs. Plant height, point of insertion of the first ear, number of ears per plant, number of grains per ear, root and stalk lodging and grain yield were studied in two locations in Brazil, during the 1997/98 season. Genotype sum of squares was divided into general (GCA) and specific (SCA) combining ability. Results indicated the existence of genetic divergence for all traits analyzed, where additive effects were predominant. The high heterosis levels observed, mainly in Xanxerê, suggested the environmental influence on the manifestation... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Zea mays; Germplasm; Heterosis; Genetic variation. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2002000100009 |
| |
|
|
| Nagarajan, Latha; Smale, Melinda. |
| In the subsistence-oriented, semi-arid production systems of Andhra Pradesh and Karnataka, India, the environment is marginal for crop growth and often there is no substitute for millet crops. Across communities, farmers grow thirteen different combinations of pearl millet, sorghum, finger millet, little millet, and foxtail millet varieties, but individual farmers grow an average of only two to three millet varieties per season. The notion of the seed system includes all channels through which farmers acquire genetic materials, outside or in interaction with the commercial seed industry. Data are compiled through household surveys and interviews with traders and dealers in village and district markets. Based on the concept of the seed lot, several... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Seed systems; Millet diversity; Variety change; Seed users; Crop diversity; Seed industry and trade; Genetic variation; Crop Production/Industries. |
| Ano: 2005 |
URL: http://purl.umn.edu/59229 |
| |
| Registros recuperados: 107 | |
|
|
|
