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| Souza Júnior,Manoel T.; Nickel,Osmar; Gonsalves,Dennis. |
| Translatable and nontranslatable versions of the coat protein (cp) gene of a Papaya ringspot virus (PRSV) isolate collected in the state of Bahia, Brazil, were engineered for expression in Sunrise and Sunset Solo varieties of papaya (Carica papaya). The biolistic system was used to transform secondary somatic embryo cultures derived from immature zygotic embryos. Fifty-four transgenic lines, 26 translatable and 28 nontranslatable gene versions, were regenerated, with a transformation efficiency of 2.7%. Inoculation of cloned R0 plants with PRSV BR, PRSV HA or PRSV TH, Brazilian, Hawaiian and Thai isolates, respectively, revealed lines with mono-, double-, and triple-resistance. After molecular analysis and a preliminary agronomic evaluation, 13 R1 and R2... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Carica papaya; Potyvirus; Resistance; Breeding; Virus. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582005000400004 |
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| Martins,Flávia de Campos; Dias,Manoel Martins. |
| In Sula leucogaster (Boddaert, 1783) it happens a brood reduction from two to one egg. The eggs hatch asynchronously and it is rare for the second chick to survive for long. A quantify parental investment is proposed and the differences between males and females of Sula leucogaster is verified for to help to understand the brood reduction. The studies were conducted on Ilhas dos Currais, Paraná, Brazil, where a total of 140 nests were studied. Males and females shared the breeding care period. However, females invested about 8% more on incubation than males (c² = 7,37; c² critic = 3,842). Time of absence in the nest for females was larger than for males (c² = 13,9; c² critic = 3,842). This is probably a function of females bringing food to chicks more... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Breeding; Brood reduction. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752003000400004 |
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| SILVA,Ana Carla Carvalho; BARROS,Adriana Fernandes de; MENDONÇA,Flávia Maria Fernandes; GAMA,Kamyla Fernanda da Silva; MARCOS,Rebeca; POVH,Jayme Aparecido; FORNARI,Darci Carlos; HOSHIBA,Márcio Aquio; ABREU,Janessa Sampaio de. |
| ABSTRACT Tambaqui, Colossoma macropomum, is one of the most produced species in Brazilian fish farming, which has boosted the development of new technologies to increase its productivity. The aim of this study was to evaluate production performance in two second-generation tambaqui stocks selectively bred for weight gain in a semi-intensive rearing system and assess its influence on total production cost. We analyzed 300 fish (initial mean weight and standard length of 160 g and 17 cm, respectively) of two families (A and B, 150 fish each). The fish were individually marked with microchips and stocked in an 800-m2 excavated pond. For economic analysis, the obtained performance data were extrapolated for a fish farm with a 10-ha pond, adopting the Total... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Aquaculture productivity; Breeding; Fish farming; Production cost; Native Brazilian fish. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672020000200108 |
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| VALENTE,Mágno Sávio Ferreira; LOPES,Maria Teresa Gomes; CHAVES,Francisco Célio Maia; OLIVEIRA,Ariane Mendes; FREITAS,Diego Rodrigo Bilby de. |
| ABSTRACT Repeatability allows an estimation of the number of evaluations needed to optimize the selection of superior genotypes, with consequent effects on the research costs in terms of financial and human resources. The objective of this study was to estimate the coefficient of repeatability of biometric and yield traits, related to fruits and seeds of sacha inchi (Plukenetia volubilis), and to define the number of evaluations required for an efficient selection and evaluation of genotypes of the species. A total of 37 non-domesticated accessions were evaluated for 19 months in a randomized block design with 5 replications and 2 plants per plot. The total number of fruits, total number of seeds, total fruit weight, mean fruit weight, and number of seeds... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Breeding; Accuracy; Selection efficiency; Plukenetia volubilis L.. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672017000300195 |
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| Registros recuperados: 789 | |
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