Selection Under Low N
Mostrando 1-12 de 28 artigos, teses e dissertações.
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1. Selection of parents for low nitrogen stress through the combining ability of maize partially inbred lines
ABSTRACT. The objective of this work was to estimate the general combining ability of partially inbred lines under high and low nitrogen (N) conditions and to select promising lines to obtain high yields for both conditions. Fifty-five partially inbred S1 progenies were evaluated using the top-cross method, where the lines were crossed with two testers. The
Acta Sci., Agron.. Publicado em: 23/09/2019
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2. Selection of maize top-crosses for different nitrogen levels through specific combining ability
ABSTRACT An alternative to increase yield without raising the production costs and minimizing the dependence of agricultural inputs is the development of maize genotypes presenting high nitrogen (N) use efficiency under low N level conditions. Thus, the objective of this study was to estimate the specific combining ability of maize top-crosses under high and
Bragantia. Publicado em: 04/04/2019
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3. Ammonium excretion, auxin production and effects of maize inoculation with ethylenediamine-resistant mutants of Pseudomonas sp.
ABSTRACT Plant growth-promoting bacteria (PGPB) comprise part of plant microbiome of biotechnological interest due to their potential to decrease the use of agrochemicals in agriculture. Among the commonly found PGPB species, the Pseudomonas genus is known for high competitiveness and efficiency in expressing growth-promotion traits. To increase the contribu
Bragantia. Publicado em: 02/08/2018
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4. Accuracy and simultaneous selection gains for N-stress tolerance and N-use efficiency in maize tropical lines
ABSTRACT Maize plants can be N-use efficient or N-stress tolerant. The first have high yields in favorable environments but is drastically affected under stress conditions; whereas the second show satisfactory yields in stressful environments but only moderate ones under optimal conditions. In this context, our aim was to assess the possibility of selecting
Sci. agric. (Piracicaba, Braz.). Publicado em: 2017-12
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5. Desamparo aprendido e imunização em humanos: avaliação metodológica/conceitual e uma proposta experimental / Learned helplessness and immunization in humans: methodological/conceptual evaluation and an experimental proposal
The results of learned helplessness studies with humans have been inconsistent. This is probably due to the systematic contiguity between the end of the aversive stimulus and the immediately preceding response during the uncontrollability session, which mimics an accidental control condition. Three experiments were conducted to establish a procedure with ade
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 03/09/2012
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6. Melhoramento intrapopulacional no sintetico elite NT para solos pobres em nitrogenio. I. Parametros geneticos de producao.
O objetivo do trabalho foi avaliar a populacao de milho (Zeas mays L.), Sintetico Elite NT, selecionada para solos com baixa disponibilidade de nitrogenio e com sincronia de florescimento masculino e feminino (ASI), e efetuar a estimativa de parametros geneticos de producao. No ano agricola de 1994/95, foram avaliadas 144 familias de meios irmaos (FMI) em am
Pesquisa Agropecuaria Brasileira. Publicado em: 2011
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7. Performance de Ceratitis capitata Wiedemann (Diptera: Tephritidae) em frutos: comparação de duas populações criadas em laboratório
This study evaluated the influence of two fruits hosts (orange and papaya) on biological and behavioral parameters of two populations of Ceratitis capitata (Wiedemann) reared under laboratory conditions. One of these populations has been reared under laboratory conditions by 25 years without introduction of wild flies (Lab-pop), while the other has been main
Neotropical Entomology. Publicado em: 2010-02
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8. Implications of selection in common bean in contrasting environments concerning nitrogen levels / ImplicaÃÃes da seleÃÃo no feijoeiro efetuada em ambientes contrastantes em nÃveis de nitrogÃnio
This study was conducted aimed at identifying lines of common bean efficient in the use of nitrogen and estimate the correlated response, in grain yield, in environments with low nitrogen availability by selection under no stress of the nutrient. One hundred lines of common bean were evaluated with and without nitrogen application in four environments. In ea
Publicado em: 2008
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9. Cultivation of Neisseria gonorrhoeae under low-oxygen conditions.
Sixteen Neisseria gonorrhoeae strains were examined for their abilities to grow under reduced oxygen tension. Low oxygen tensions were developed by evacuation-replacement procedures in which anaerobes and oxidation-reduction indicators were used as controls. All strains survived 96 h in a medium reduced to below -125 mV without visible growth. Detectable gro
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10. Mutation Load under Vegetative Reproduction and Cytoplasmic Inheritance
For reasons that remain unclear, even multicellular organisms usually originate from a single cell. Here I consider the balance between deleterious mutations and selection against them in a population with obligate vegetative reproduction, when every offspring is initiated by more than one cell of a parent. The mutation load depends on the genomic deleteriou
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11. The Coalescent Process in Models with Selection
Statistical properties of the process describing the genealogical history of a random sample of genes are obtained for a class of population genetics models with selection. For models with selection, in contrast to models without selection, the distribution of this process, the coalescent process, depends on the distribution of the frequencies of alleles in
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12. Allelic Genealogy under Overdominant and Frequency-Dependent Selection and Polymorphism of Major Histocompatibility Complex Loci
To explain the long-term persistence of polymorphic alleles (trans-specific polymorphism) at the major histocompatibility complex (MHC) loci in rodents and primates, a computer simulation study was conducted about the coalescence time of different alleles sampled under various forms of selection. At the same time, average heterozygosity, the number of allele