Qualidade industrial dos grãos de arroz de populações promissoras quanto à resistência ao estresse hídrico, cultivadas em épocas distintas.

O objetivo deste estudo, que ainda está em fase de avaliação, foi de avaliar se há diferença na renda e rendimento de inteiros de uma população de arroz de terras altas, selecionada por conter materiais genéticos promissores quanto à produção em períodos secos ou com água limitante

Performance of Embrapa's elite populations of subtropical lowland rice in the 2013/14 crop year.

This study aimed to estimate GY genetic progress expected in the FY from the 2013/14 crop year. The trials were carried out in Goianira and Alegrete, respectively in the Center and Southwest of Brazil

Poder de discriminação de genótipos e representatividade de locais utilizados na avaliação de arroz de terras altas.

Neste trabalho foram utilizados dados do caráter produção de grãos provenientes de dezoito ensaios de Valor de Cultivo e Uso, conduzidos pelo programa de melhoramento de arroz de terras altas da Embrapa Arroz e Feijão, período-safra 2009/10. O objetivo foi identificar o local de teste que apresente, simultaneamente, maior poder de discriminação dos genótipos para esse caráter e represente mais adequadamente os demais locais de avaliação.Pôster - pós-graduação

Technological properties of aromatic Basmati rice accessions.

The objective of this study was to characterize the paste profile of basmati-style aromatic rice accessions. The evaluation of the 56 rice accessions by the Mean of Distances Method yielded seven groups of rice accessions based on the evaluated parameters (elongation, apparent amylose content (AAC), aroma, and paste properties). Group 1 was represented by the control sample IRGA417, a non-aromatic cultivar with the highest AAC (22.5%). The aromatic cultivars Jasmine, Empasc 104, IAC500, and Jasmine85 constituted the third group. Group 4 consisted of 41 Basmati accessions and exhibited the highest average elongation ratio (greater than 2.0). Groups 3 and 4 exhibited comparable aroma scores (2.9 and 2.8, respectively) and retrogradation processes (final viscosity: 285.37 and 291.26 RVU, and setback: 136.84 and 166.01 RVU, respectively). Group 5 was constituted with seven Basmati accessions, while groups 6 and 7 were formed with one and two Basmati accessions, respectively. Groups 5 and 6 exhibited comparable paste properties, with peak viscosities of 186.06 and 153.1 RVU, respectively, and final viscosities of 210.27 and 236.7 RVU, respectively, which were lower than those observed in the other groups. In contrast, group 7 exhibited intermediate parameters between the control IRGA417 and groups 3 and 4. Groups 3, 4, 5, 6, and 7 were classified as low amylose grains, with an AAC of 12-20%. The Basmati accession (group 4) exhibited a comparable paste profile, with a notable distinction in its high elongation, aroma, and low AAC. Consequently, these cultivars may be well accepted by consumers of aromatic rice

Validação do QTL PUP1 para tolerância à deficiência de fósforo em arroz de terras altas.

O objetivo deste estudo é validar em progênies S0:2 da população CNA9/3/1 (de seleção recorrente) a presença do QTL Phosphorus uptake 1 (Pup1). Nesse sentido, foram avaliados sete marcadores moleculares codominantes e nove dominantes, específicos para esse QTL

Real-time monitoring of Pseudomonas aeruginosa biofilm formation on endotracheal tubes in vitro

BACKGROUND: Pseudomonas aeruginosa is an opportunistic bacterial pathogen responsible for both acute and chronic infections in humans. In particular, its ability to form biofilm, on biotic and abiotic surfaces, makes it particularly resistant to host's immune defenses and current antibiotic therapies as well. Innovative antimicrobial materials, like hydrogel, silver salts or nanoparticles have been used to cover new generation catheters with promising results. Nevertheless, biofilm remains a major health problem. For instance, biofilm produced onto endotracheal tubes (ETT) of ventilated patients plays a relevant role in the onset of ventilation-associated pneumonia. Most of our knowledge on Pseudomonas aeruginosa biofilm derives from in vitro studies carried out on abiotic surfaces, such as polystyrene microplates or plastic materials used for ETT manufacturing. However, these approaches often provide underestimated results since other parameters, in addition to bacterial features (i.e. shape and material composition of ETT) might strongly influence biofilm formation. RESULTS: We used an already established biofilm development assay on medically-relevant foreign devices (CVC catheters) by a stably transformed bioluminescent (BLI)-Pseudomonas aeruginosa strain, in order to follow up biofilm formation on ETT by bioluminescence detection. Our results demonstrated that it is possible: i) to monitor BLI-Pseudomonas aeruginosa biofilm development on ETT pieces in real-time, ii) to evaluate the three-dimensional structure of biofilm directly on ETT, iii) to assess metabolic behavior and the production of microbial virulence traits of bacteria embedded on ETT-biofilm. CONCLUSIONS: Overall, we were able to standardize a rapid and easy-to-perform in vitro model for real-time monitoring Pseudomonas aeruginosa biofilm formation directly onto ETT pieces, taking into account not only microbial factors, but also ETT shape and material. Our study provides a rapid method for future screening and validation of novel antimicrobial drugs as well as for the evaluation of novel biomaterials employed in the production of new classes of ETT

Performance of embrapa's elite populations of subtropical lowland rice in the 2013/14 crop year.

This study aimed to estimate GY genetic progress expected in the FY from the 2013/14 crop year. The trials were carried out in Goianira and Alegrete, respectively in the Center and Southwest of Brazil

Avaliação de famílias da população de seleção recorrente PIrga 2.

O objetivo desse trabalho foi avaliar famílias S0:2 quanto ao rendimento de grãos, reação à brusone e outras características agronômicas, selecionando as mais promissoras para formar o próximo ciclo de recombinação

Avaliação de famílias do cruzamento BRS Primavera x Douradão para tolerância à deficiência hídrica.

O trabalho teve como objetivo identificar famílias mais tolerantes à deficiência hídrica, de um cruzamento entre genótipos divergentes quanto a essa característica, como suporte ao programa de melhoramento para as condições climáticas com distribuição irregular de chuvas.Pôster - graduação

Avaliação da tolerância à deficiência hídrica de genótipos de arroz de terras altas.

O trabalho teve como objetivo avaliar o potencial produtivo de genótipos de arroz de terras altas da Coleção Nuclear de Arroz da Embrapa (CNAE), para as condições de deficiência hídrica, visando a inclusão de tais genótipos no programa de melhoramento de arroz de terras altas da Embrapa Arroz e Feijão.Pôster - graduação