Construção de mapa genético e análise comparativa entre cruzamentos interespecíficos de Oryza glumaepatula x Oryza sativa utilizando marcadores microssatélites.

Este trabalho objetivou: 1) desenvolver um mapa genético baseado em marcadores SSR para o cruzamento interespecífico Oryza sativa (Cica 8) x Oryza glumaepatula (RS-16); 2) avaliar a conservação da ligação e ordem dos locos SSR entre dois mapas interespecíficos, os quais possuem o parental RS-16 em comum; 3) genotipar 118 famílias na geração RC2F1 obtida a partir do cruzamento interespecífico entre Oryza sativa (Cica 8) e Oryza glumaepatula (RS-16)

The effect of queen insemination volume on the growth of newly established honey bee (Apis mellifera) colonies

International audienceAbstractThe number of female progeny that a honey bee (Apis mellifera) queen produces in her lifetime is directly dependent on the amount of semen she collects upon mating (i.e., insemination volume) and the number of viable sperm cells contained within the semen (i.e., sperm viability). Queen insemination volume has been shown to alter queen mandibular pheromone profiles, as well as worker behavior and physiology at the individual level. In order to determine if queen insemination volume has any colony-level effects, we compared the growth of newly established colonies headed by queens instrumentally inseminated with either a low volume (1.5 μL) or a high volume (9.0 μL) of pooled semen from May to October in 2013 and 2015. We did not find a significant effect of queen insemination volume on the production of worker comb, drone comb, stored food, worker population, or seasonal queen or colony survivorship. Therefore, we concluded that queen insemination volume does not seem to directly affect growth at the colony level, at least during a colony’s first year

Caracterização molecular de linhagens de introgressão do cruzamento interespecífico Oryza sativa x O. glumaepatula por marcadores SSR fluorescentes.

Este trabalho teve como objetivo realizar a caracterização molecular de 114 linhagens de Introgressão RC2F9 derivadas do cruzamento O. sativa Cica-8 x O. glumaepatula RS-16

Selection of rice genotypes with greater seedling vigor under controlled conditions.

This study aimed to identify allele sources for seedling vigour in 65 rice genotypes, using the slantboard test in a germination chamber, and to determine the best parameter for evaluating seedling vigour. The experiment was arranged in the randomized block design with three replicate blocks. Root and primary leaf length data were collected from seedlings grown in the dark at 18 degrees C, 15 days after sowing and at 25 degrees C, ten days after sowing. The best performing genotypes for seedling vigour were included in Group 2, which contained red rice accessions. The vigour was best evaluated under controlled conditions (grown at 18 degrees C, 15 days after sowing) through measurements of roots and primary leaves.

Development of rice lines with gene introgression from the wild Oryza glumaepatula by the AB-QTL methodology.

Wild rice of the species Oryza glumaepatula is found Brazil and has been used to broaden the genetic basis of irrigated rice populations in Embrapa breeding programmes. The objective of this study was to demonstrate and discuss approaches used in the development of Oryza sativa lines containing genes transferred from Oryza glumaepatula, resulting in introgression lines with a broader genetic basis and high yield. First of all, genes were transferred from the wild species to cultivated rice by the AB-QTL methodology. Eighteen families were selected using QTL analysis and agronomical performance data. After the heterosis test, the families CNAi 9020 and CNAi 9024 were selected and submitted to microsatellite marker-assisted selection. Thirty-five lines were then selected with high plant vigour, high tiller and panicle number per plant, high grain yield of the main crop, and a strong regrowth capacity which makes the use of ratoons a feasible alternative

Las líneas de campo eléctrico en la construcción de significados. Un estudio multimodal de la acción en el aula

En este artículo presentamos un estudio cualitativo basado en el análisis de las explicaciones en el aula de tres profesores de física electromagnética de la facultad de ingeniería. El análisis, desde la perspectiva multimodal, toma en cuenta la función de la representación visual a través de la acción. Se pretende describir el uso que hacen los profesores de la premisa “líneas de campo” en la construcción de significados del campo eléctrico, identificando la función de los recursos multimodales utilizados. Los resultados obtenidos, nos llevan a reflexionar sobre el papel de las líneas de campo en el proceso de construcción de significados del profesor, no sólo para el concepto de campo eléctrico, sino para el desarrollo de la visión tridimensional más allá del papel, competencia fundamental en el estudiante de ingeniería

Comparative linkage mapping of Oryza glumaepatulaand Oryza sativa interspecific crosses based on microsatellite and expressed sequence tag markers.

Molecular linkage maps representing the rice genome have been an important tool for breeding programs because they allow the elucidation of polygenic traits and are an efficient tool for monitoring wild introgressions in interspecific crosses. Common markers among rice genetic maps are important in defining the homology of chromosomes and the synteny between genomic target regions. We used 148 markers (expressed sequence tags, microsatellites and single nucleotide polymorphisms) to construct a molecular linkage map based on co-dominant markers for an interspecific backcross population using a wild rice ( Oryza glumaepatula) from Brazil and performed a comparative analysis with other interspecific maps. The comparative analysis revealed a Spearman correlation index of 0.86 for marker order conservation to a previous map constructed for an interspecific cross using the same wild parent. Approximately 90% of markers common to other interspecific maps kept the same order. These results indicate that it will be possible to generate a unique genetic map using the wild donor and that it may be a helpful tool for breeding programs because plants derived from different interspecific populations can be rapidly scanned using markers associated with useful wild traits

BRS Ourominas: nova cultivar de arroz irrigado para Mato Grosso do Sul.

bitstream/item/24863/1/COT200254.pdfDocumento on-line

Squeezing generation and revivals in a cavity-ion system in contact with a reservoir

We consider a system consisting of a single two-level ion in a harmonic trap, which is localized inside a non-ideal optical cavity at zero temperature and subjected to the action of two external lasers. We are able to obtain an analytical solution for the total density operator of the system and show that squeezing in the motion of the ion and in the cavity field is generated. We also show that complete revivals of the states of the motion of the ion and of the cavity field occur periodically.Comment: 9 pages, 3 figure

Caracterização e seleção de alto rendimento em linhagens de arroz derivadas do cruzamento de Oryza sativa (Cica-8) x Oryza glumaepatula (RS-16).

Este trabalho tem como objetivo, executar a caracterização molecular e agronômica de 114 linhagens de introgressão derivadas do cruzamento interespecífico entre a cultivar elite Cica-8 (Oryza sativa) e o acesso silvestre RS-16 (Oryza glumaepatula)