Nutrient accumulation, export and cycling in Jatropha curcas L.

2016

Gradual correction of phosphorus availability in the no-tillage system.

2016

Mobile application for Asian soybean rust tracking in Brazil.

ABSTRACT: Brazil is the second - largest soybean producer. With the arrival of Asian soybean rust in the Western Hemisphere in 2001, a considerable amount of resources has been allocated to understand and control this important yield - limiting disease. Due its rapidly dissemination, in 2004, the federal government led an effort to create the Asian soybean rust consortium, with the main goal of coordinating research activities involving public and private sector. This paper describes the development of a mobile application, designed to support the Asian Soybean Rust Consortium to monitor, in time and space, occurrences of Asian soybean rust in Brazil. RESUMO: O Brasil é o segundo maior produtor de soja do mundo. Com a chegada da ferrugem da soja no hemisfério ocidental em 2001, uma quantidade considerável de recursos foram alocados para entender e controlar esta importante doença. Devido a sua rápida disseminação, em 2004, o governo federal uniu esforços e criou o Consórcio Antiferrugem, cujo objetivo principal seria de coordenar atividades de pesquisa envolvendo empresas públicas e privadas. Este artigo apresenta o desenvolvimento de um aplicativo móvel, projetado para auxiliar este Consórcio no monitoramento em tempo e espaço, de ocorrências de ferrugem asiática de soja no Brasil.

Conservação in vitro de amoreira-preta: Crescimento lento.

2016

Diallel analysis in cowpea aiming at selection for extra-earliness.

In Brazil, the production of cowpea is concentrated in the Northeast and North; however, in recent years, its cultivation has expanded to the Cerrado biome of the Brazilian Midwest region, where it is incorporated into production arrangements in the form of off-season

Investigation of the mechanism of resistance to glyphosate herbicide in hairy fleaban.

The resistance of weeds to herbicides is a consequence of one or more mechanisms in the plant, responsible for not allowing the herbicide to act properly at the active site.

Genetic diversity of the forage peanut in the Jequitinhonha, São Francisco, and Paranã River valleys of Brazil.

Arachis pintoi and A. repens are legumes with a high forage value that are used to feed ruminants in consortium systems. Not only do they increase the persistence and quality of pastures, they are also used for ornamental and green cover. The objective of this study was to analyze microsatellite markers in order to access the genetic diversity of 65 forage peanut germplasm accessions in the section Caulorrhizae of the genus Arachis in the Jequitinhonha, São Francisco and Paranã River valleys of Brazil. Fifty-seven accessions of A. pintoi and eight of A. repens were analyzed using 17 microsatellites, and the observed heterozygosity (HO), expected heterozygosity (HE), number of alleles per locus, discriminatory power, and polymorphism information content were all estimated. Ten loci (58.8%) were polymorphic, and 125 alleles were found in total. The HE ranged from 0.30 to 0.94, and HO values ranged from 0.03 to 0.88. By using Bayesian analysis, the accessions were genetically differentiated into three gene pools. Neither the unweighted pair group method with arithmetic mean nor a neighbor-joining analysis clustered samples into species, origin, or collection area. These results reveal a very weak genetic structure that does not form defined clusters, and that there is a high degree of similarity between the two species.

Germinação in vitro do pólen de Theobroma grandiflorum (Willdenow ex Sprengel) Schumann.

Foram caracterizados cinco estádios da antese da flor de cupuaçuzeiro, com o objetivo de desenvolver uma técnica para teste de germinação in vitro do pólen, determinar sua longevidade e qual o melhor estádio para a coleta de pólen fresco para ser usado em polinizações controladas.

Sugarcane trash levels in soil affects the fungi but not bacteria in a short-term field experiment.

The sugarcane in Brazil is passing through a management transition that is leading to the abolition of pre-harvest burning. Without burning, large amounts of sugarcane trash is generated, and there is a discussion regarding the utilization of this biomass in the industry versus keeping it in the field to improve soil quality. To study the effects of the trash removal on soil quality, we established an experimental sugarcane plantation with different levels of trash over the soil (0%, 50% and 100% of the original trash deposition) and analyzed the structure of the bacterial and fungal community as the bioindicators of impacts. The soil DNA was extracted, and the microbial community was screened by denaturing gradient gel electrophoresis in two different seasons. Our results suggest that there are no effects from the different levels of trash on the soil chemistry and soil bacterial community. However, the fungal community was significantly impacted, and after twelve months, the community presented different structures among the treatments.

Effects of cAMP modulators during in vitro prematuration of bovine oocytes on gap junctional communication and embryo development potential.

2016

Global methylation of bovine cells derived from amniotic fluid, adipose tissue and skin fibroblastos and its use in nuclear transfer in the presence or absence of Trichostatin A.

2016

Characterization of aromatic profiles in brazilian tropical wines determined by gas chromatography and multivariate statistical analysis.

2011

Biochemical assessment of oxidative stress by the use of açai (Euterpe oleracea Martius) gel in physically active individuals.

2016

The development of the viticulture for a high quality tropical wine production in the world.

2011

Regeneration in felling gaps after logging in Acre state, Western Amazon.

Regeneration of tree species in felling gaps were studied during the first two years following harvesting in a tropical forest in Acre state, Brazil. Felling gaps averaged 340 m2 in size, while canopy openings averaged 17%. Seedling mortality in adjacent undisturbed forest was 4.6% yr', and 59.6% yr·1 and 100% yr' in the crown and trunk zones respectively, two years after logging. Recruitment of new seedlings inthe undisturbed forest understorey averaged 462 plants ha' yr', two years after gap creation. Inthe crown zones of the gaps, recruitment of seedlings averaged 1350 ha' yr', and in the trunk zones 1392 ha' yr'. The entire seedling community in trunk zones after logging was composed of new recruits. lhere was a tendency for seedling growth rates to increase from the natural forest (0,21cm yr-1) to the crown zone (0.40cm yr'), Before gap creation, species richness and diversity and seedling density were quite similar. After gap creation a sharp decrease could be verified in the gap.zones, however the differences between gap and undisturbed forest decreased rapidly in the second year after gap creation. lhe regeneration of commercial species was not affected by gap creation apart from the increase in growth rates.