ATUAÇÃO NO APOIO À COORDENAÇÃO DE PESQUISA NO CAMPUS AVANÇADO ABELARDO LUZ

O envolvimento de alunos em atividades de pesquisa e extensão incrementa a qualificação destes, viabilizando a indissociabilidade do tri pé ensino pesquisa extensão. Neste trabalho buscou se relatar a experiência como bolsista, atuante no auxílio à coordenação de pesquisa do Campus Avançado de Abelardo Luz IFC. Ainda que se trate de um campus em implantação, atividades significativas fora m desenvolvidas pela bolsista. A bolsa referente ao edital 183/2016, além de contribuir com a coordenação de pesquisa, tem um grande valor por agregar conhecimentos à estudante, complementando sua formação profissional e social

A hibridação no melhoramento genético da cultura da aveia-branca: técnicas e fatores que interferem na eficiência dos cruzamentos dirigidos

Different techniques of artificial hybridization have been adopted in white oat breeding programs in search of superior genotypes. This way, the objective of this study was to verify the effectiveness of artificial crosses adopting different hybridization methods and conditions, and to analyze the relationship between the environmental conditions at the moment of artificial hybridizations and cross efficiency. During the year 2008, 400 artificial crosses were performed among white oat cultivars, and two methods of hybridization were tested, varying the number of pollinated florets and the interval between pollination and emasculation. The best efficiency rate in the hybridizations was achieved with thepollination of six florets per panicle, performing the pollination four days after emasculation using the cut flower technique, or in the range of one to four days with the open flower technique. Moreover, lower temperatures and higher relative humidity at the moment of emasculation show relationship with the increase in the efficiency of hybridizations.Diferentes técnicas de hibridação artificial têm sido adotadas pelos programas de melhoramento de aveia-branca na busca de genótipos elite. Neste sentido, buscou-se verificar a efetividade dos cruzamentos artificiais com a adoção de diferentes métodos e condições de hibridação, além de analisar a relação entre as condições do ambiente no momento dos cruzamentos com a sua efetividade. No ano de 2008, 400 cruzamentos artificiais foram realizados entre cultivares de aveia-branca, sendo testados dois métodos de hibridação, variando também o número de antécios polinizados e o intervalo entre a polinização e a emasculação. A maior eficácia nas hibridações foi alcançada ao se polinizar seis antécios por panícula, realizando a polinização 4 dias após a emasculação na técnica flor cortada, ou no intervalo de 1 a 4 dias com a técnica conhecida como flor aberta. Além disso, a menor temperatura e a maior umidade relativa do ar no momento da emasculação demonstram relação com o incremento da eficácia das hibridações

Heterosis and genetic parameters for grain quality in oat segregating populations

Improvement of quality-related traits of grains is a constant concern in white oat breeding programs, which challenges breeders to understand their dynamics. The performance of different genetic combinations must be thoroughly evaluated to make high nutritional quality cultivars available. This study aimed to estimate the heterosis on F1 and F2 generations, vigor loss, due to inbreeding, and correlation between the grain chemical components to understand the dynamics of these traits, considering two segregating oat progenies. The populations Albasul × UPF 15 (population 1) and IAC 7 × UFRGS 19 (population 2) were developed. Both populations showed transgressive segregant individuals. The combination Albasul × UPF 15 provided significant heterosis for traits β-glucan total and soluble fiber contents, while the population obtained by crossing IAC 7 × UFRGS 19 generated significant gain by heterosis for total fiber, insoluble fibers and non-structural carbohydrate contents. Considering the F2 average for each population, one can observe that population 1 presents higher β-glucan and lipid contents than population 2. On the other hand, population 2 has higher protein content than population 1. In both populations, the non-structural carbohydrate content is strongly and negatively correlated whith protein, total and insoluble fibers. Correlations between total fibers and lipids and between total fibers and insoluble fibers were both positive and high in both populations

Per se performance and genetic parameters of wheat lines expressing the “stay‑green” character

The objective of this work was to determine the per se performance and the genetic parameters of traits of interest in wheat inbred lines expressing or not the “stay‑green” character. The experiment was carried out in 2003, 2004, and 2005 in a randomized complete block design with three replicates. Thirty‑two sister‑lines of wheat, 15 with and 17 without the stay‑green character, were evaluated. The lines carrying this character showed higher grain yield, higher average number of kernels per ear, and lower weight of a thousand grains. Moreover, grain yield and grain mass heritabilities were higher in these lines, which reveled lower influence of environmental variation on the expression of these characters. The “stay‑green” character contributes to increase productivity and productive stability of wheat.O objetivo deste trabalho foi determinar o desempenho per se e os parâmetros genéticos de caracteres de interesse, em linhagens de trigo que expressam ou não o caráter “stay‑green”. O experimento foi conduzido em 2003, 2004 e 2005, em delineamento experimental de blocos ao acaso, com três repetições. Foram avaliadas 32 linhagens irmãs de trigo, 15 com e 17 sem o caráter “stay‑green”. As linhagens portadoras desse caráter apresentaram maior produtividade de grãos, maior número de grãos por espiga e menor massa de mil grãos. Além disso, as herdabilidades da produtividade e da massa de grãos foram maiores nessas linhagens, o que revelou menor influência de variações ambientais sobre a expressão desses caracteres. O caráter “stay‑green” contribui para o aumento da produtividade e da estabilidade produtiva do trigo

Pervasive gaps in Amazonian ecological research

Biodiversity loss is one of the main challenges of our time,1,2 and attempts to address it require a clear un derstanding of how ecological communities respond to environmental change across time and space.3,4 While the increasing availability of global databases on ecological communities has advanced our knowledge of biodiversity sensitivity to environmental changes,5–7 vast areas of the tropics remain understudied.8–11 In the American tropics, Amazonia stands out as the world’s most diverse rainforest and the primary source of Neotropical biodiversity,12 but it remains among the least known forests in America and is often underrepre sented in biodiversity databases.13–15 To worsen this situation, human-induced modifications16,17 may elim inate pieces of the Amazon’s biodiversity puzzle before we can use them to understand how ecological com munities are responding. To increase generalization and applicability of biodiversity knowledge,18,19 it is thus crucial to reduce biases in ecological research, particularly in regions projected to face the most pronounced environmental changes. We integrate ecological community metadata of 7,694 sampling sites for multiple or ganism groups in a machine learning model framework to map the research probability across the Brazilian Amazonia, while identifying the region’s vulnerability to environmental change. 15%–18% of the most ne glected areas in ecological research are expected to experience severe climate or land use changes by 2050. This means that unless we take immediate action, we will not be able to establish their current status, much less monitor how it is changing and what is being lostinfo:eu-repo/semantics/publishedVersio