Glyphosate como regulador de crescimento em arroz de terras altas

The lodging of some rice cultivars at harvest time can lead to significant losses in yield, and the inappropriate water and nitrogen management, under high-tech conditions, can aggravate the problem. The use of vegetal regulators is an alternative to reduce lodging, however, information on this topic are rare. The study aimed to evaluate the application of glyphosate sub doses (26 g ha -1, 52 g ha -1, 78 g ha -1, 104 g ha -1, 130 g ha -1, 156 g ha -1, and 182 g ha -1) on agronomical traits, development, and yield of upland rice crops irrigated by aspersion, during the floral differentiation period. The experiment was carried out in Selvíria, Mato Grosso do Sul State, Brazil, through the agricultural years of 2008/2009 and 2009/2010. The increase of glyphosate sub doses, at the floral differentiation period of the Primavera cultivar, reduced the plants height, panicle size, and, consequently, yield. Sub doses higher than or equal to 78 g ha -1 eliminated the plants lodging process.

Análise de crescimento e produtividade de cultivares de arroz de terras altas dos tipos tradicional, intermediário e moderno

The growth analysis allows the characterization and understanding of the upland rice cultivars development. This study aimed at characterizing, by using the growth analysis, the physiological components and agronomic performance, as well as the differences among traditional, intermediate and modern upland rice cultivars. The experiment was conducted under upland rice conditions, favored by the use of supplementary irrigation. The experimental design was randomized blocks, with three treatments consisting of traditional (Caiapó), modern (Maravilha) and intermediate (BRS Primavera) cultivars and eight replications. The leaf area index (LAI), instantaneous growth rate (IGR), relative growth rate (RGR), net assimilation rate (NAR) and specific leaf area (SLA), as well as grain yield and yield components, were evaluated. The intermediate and traditional cultivars presented the highest total dry matter accumulation rate, while the traditional and modern ones showed the highest LAI. The intermediate cultivar presented the highest IGR, RGR, NAR and SLA levels, as well as the highest grain yield, as a consequence of the higher spikelet fertility and 1,000 grain mass.

Qualidade de mangas cv. palmer após armazenamento sob baixas temperaturas

This study aimed to evaluate the quality of 'Palmer' mangoes previously stored at low temperatures, after their transference to the environmental condition. Fruits harvested at physiological maturity were carefully transported to the Laboratory where they were selected, standardized as the color, size and absence of injuries and treated with fungicide before they were stored at 2°C (75.7% RH), 5°C (73.8% RH) e 12°C (82% RH) for 7, 14 and 21 days. At the end of each period, the fruits were transferred to environmental condition (22.9°C; 62.3% RH), where they were kept for 1, 3, 5 and 7 days, simulating the trading period, and evaluated for the occurrence of injuries and rottenness; peel and pulp color; firmness; contents of soluble solids, titratable acidity and ascorbic acid, as well as, the activities of the enzymes peroxidase, polyphenoloxidase and phenylalanine ammonia-lyase. The results indicated that 'Palmer' mangoes can be stored at 12°C for 21 days without damage to ripening, but with limitations due to the occurrence of decay. The storage at 2°C and 5°C was limited by the occurrence of injuries in the peel, but at the temperature of 2°C these symptoms were more severe and compromised the development of the characteristic color of the peel. However, the ripening of the pulp was not harmed, but this process occurred with less intensity than in mangoes maintained at 12°C.

Tolerância à deficiência hídrica de genótipos de arroz de terras altas

Water deficit is one of the environmental factors that cause a great reduction in the upland rice grain yield. The objective of this study was to evaluate genotypes of upland rice with broad genetic diversity for tolerance to this stress and to identify secondary traits for evaluation of this tolerance. Sixty-four genotypes were evaluated during two years at the Experiment Station of EMATER, in Porangatu, GO, under well-watered and water deficit conditions. The genotypes showed differences in grain yield and were influenced differently by the water treatments, both under a mild water deficit in the first year and under a severe one in the second year. The genotype grain yield under water deficiency was significantly and positively correlated with tiller fertility, number of panicles m-2, 100-grain weight, and plant height, and negatively with spikelet sterility and the number of days for the occurrence of 50% panicle emergence. It was also observed that the most productive genotypes under water deficit conditions showed lower leaf temperature, indicating improved water status. Nine genotypes were productive in both water conditions and three were productive only when well-watered.

Atividade proteolìtica de bactérias psicrotróficas em leites estocados em diferentes temperaturas

The widespread use of cooling technology as a tool for maintaining the microbiological and organoleptic characteristics of milk, Without effective hygienic practices throughout the milk production, caused the psychrotrophic micro-organisms to become major deteriorative bacteria in the dairy industry. The present study aimed to assess how the proteolytic psychrotrophic metabolism responds to different milk storage temperatures, drawing a parallel among psychrotrophic growth, amount of micro-organisms capable of breaking down proteins and amount of GMP (glycomacropeptide) released. Milk samples were collected directly from the cooling tank and subjected to count of psychrotrophs, count of proteolytic micro-organisms and the concentration of GMP at different storage times and temperatures. There was no linearity between the microbiological parameters and the GMP measured, according to the time/temperature binomial. The highest concentration of GMP (5.07 mg/mL) was measured in the binomial 8°C/24h (T8/ M24). The data make clear the need for further studies about questions involving the psychrotrophic microbiota in order to clarify extremely important basic questions about their metabolism.

Viabilidade técnica e econômica da larvicultura do camarão-da-amazônia, Macrobrachium amazonicum, em diferentes temperaturas

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Ecofisiologia de morfotipos reto e espiralado de Cylindrospermopsis raciborskii (Cyanobacteria) em condições controladas

Pós-graduação em Ciências Biológicas (Biologia Vegetal) - IBRC

Produção de etanol a 40-42ºC em uma co-cultura de Saccharomyces cerevisiae e Issatchenkia orientalis

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Características estruturais e físico-químicas de amidos obtidos de diferentes fontes botânicas

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Síntese e caracterização de cátodos de perovskitas 'La IND.0,6''Sr IND.0,4''Fe IND.y''Co IND.1-y''O IND.3-'delta'', para células a combustível de eletrólito sólido (SOFC) operando em temperaturas intermediárias

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Preparação de filmes policristalinos de GaN pela técnica de sputtering reativo a baixas temperaturas de substrato

Pós-graduação em Ciência e Tecnologia de Materiais - FC

Mecanismos de transporte elétrico excitados termicamente em Sn 'O IND. 2' dopado com Ce

Pós-graduação em Ciência e Tecnologia de Materiais - FC

Efeito da estocagem da goiabada a diferentes temperaturas sobre os teores de carotenóides e de ácido ascórbico

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Estabilidade de constituintes bioquímicos frente a diferentes temperaturas e períodos de estocagem, em amostras de soro de cães hígidos

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Quantificação da penetração de um corante orgânico em uma resina composta fotopolimerizada em variadas temperaturas de cura por LEDs azuis e uma lâmpada halógena

Pós-graduação em Ciências Odontológicas - FOAR