https://repositorio.ufu.br/handle/123456789/5161 Sat, 27 Jun 2026 05:39:06 GMT 2026-06-27T05:39:06Z https://repositorio.ufu.br/handle/123456789/48772 Title: Impactos ambientais da reciclagem do alumínio: uma revisão bibliográfica sobre os desafios e limitações Sun, 01 Mar 2026 00:00:00 GMT https://repositorio.ufu.br/handle/123456789/48772 2026-03-01T00:00:00Z https://repositorio.ufu.br/handle/123456789/48770 Title: Diversidade espacial e prospecção de fungos fitopatogênicos para o controle biológico do cipó preto (Adenocalymma impressum) Abstract: The black liana (Adenocalymma impressum) poses a significant challenge to comercial Eucalyptus plantations in the eastern Amazon owing to its rapid growth and resistance to conventional herbicide-based control. This study aimed to prospect and characterize phytopathogenic fungi associated with A. impressum for potential use in biological control. Fungal isolates were collected from symptomatic plants in Maranhão, Brazil, resulting in 124 isolates, of which 24 were pathogenic. Among these, Lasiodiplodia theobromae SC-35 exhibited rapid symptom development, extensive tissue colonization, and host specificity, while remaining nonpathogenic to eucalyptus clones. Environmental factors, including temperature and native forest remnants, influenced fungal diversity and aggressiveness. These findings demonstrate the potential of SC-35 as candidate for development of a sustainable and effective bioherbicide for managing black liana, highlighting the value of endemic phytopathogens in integrated forest weed management strategies. Fri, 06 Mar 2026 00:00:00 GMT https://repositorio.ufu.br/handle/123456789/48770 2026-03-06T00:00:00Z https://repositorio.ufu.br/handle/123456789/48768 Title: Parâmetros genéticos e seleção de populações F2 provenientes de cruzamentos simples e duplos de alfaces biofortificadas e tropicalizadas Abstract: Lettuce is one of the most widely consumed leafy vegetables worldwide, with continuous cultivation throughout the year. In Brazil, its performance is limited by tropical conditions, especially high temperatures that induce early bolting, compromising commercial and nutritional quality. At the same time, the demand for functional foods is increasing, driving research focused on the biofortification of lettuce with bioactive compounds through genetic improvement. This study aimed to estimate genetic parameters in F2 populations derived from single and double hybrids of biofortified and tropicalized lettuces, with the goal of selecting outstanding populations. Fifteen F2 populations and three commercial cultivars were evaluated for agronomic traits and bioactive compound content. The hybrid populations showed superior performance compared to the controls, particularly in number of leaves, delayed bolting, and higher levels of chlorophyll, carotenoids, and anthocyanins, with bioactive compounds exhibiting medium to high heritability. Genetic analysis revealed CVG/CVA values close to 1 for Chlorophyll a (0.93), Carotenoids (0.74), and Anthocyanins (0.70), indicating the feasibility of genetic selection. The results confirmed that bioactive compound content in lettuce is determined by genetic factors, enabling the identification and selection of populations for biofortification and tropicalization, contributing to the development of cultivars adapted to Brazilian edaphoclimatic conditions. Fri, 26 Sep 2025 00:00:00 GMT https://repositorio.ufu.br/handle/123456789/48768 2025-09-26T00:00:00Z https://repositorio.ufu.br/handle/123456789/48756 Title: Parâmetros genéticos, estratégias de seleção e diversidade genética em genótipos de soja Abstract: This thesis is divided into three chapters. In the first chapter, the objective was to study the combinatorial capacity of three parental lines through diallel crosses, using Griffing's method I (1956). Additive effects were more significant than non-additive effects for all traits evaluated. The TMG 801 parent contributed to an increase in most of traits evaluated, while the BRSGO 7560 parent contributed to a decrease in those traits. The most promising cross for shortening the growing season was BRSGO 7560 x TMG 801, while the cross UFUS 7415 x TMG 801 stood out for increasing grain yield. The combination that presented the most favorable values for cycle reduction and increased grain production was TMG 801 x BRSGO 7560. In the second chapter, the objective was to develop three soybean populations and estimate genetic parameters and breeding gains, with the aim of shortening the growing season and increasing grain yield, through the analysis of generations. Overall, for each cross, the means for agronomic and production traits in the F2, RC1, and RC2 generations were intermediate between those of their parents, and the values for the backcrosses were close to those of their respective parent. The heritability estimates (%) for the BRSGO 7560 x TMG 801 cross were: NDF (114.66%), NNTo (78.92%), NTV (102.21%), and PG (69.02%); in the combination TMG 7161 RR x UFUS 7415 they were: NNTo (107.2%), NTV (94.06%), and PG (104.91%); and in the combination TMG 801 x UFUS 7415 they were: NDF (94.84%), NDM (168.40%), NTV (71.05%), and PG (70.69%). The greatest gains per selection for cycle reduction (NDM) were obtained in the TMG 801 x UFUS 7415 cross (-21.09%), while, for increased grain production (g), the greatest gains were observed in the TMG 7161 RR x UFUS 7415 cross (97.88%). In the third chapter, the objective was to evaluate different strategies for selecting early-cycle, high-grain-yielding progenies using direct and indirect selection indices, as well as to conduct studies of genetic diversity using different clustering techniques, with the aim to identify divergent parents. Thirty progenies, F6-F7 and F7-F8, were evaluated in two growing seasons, in addition to four control lines (UFUS 7415, UFUS Tupi, UFUS 7910, and UFUS MLX). Genetic variability was detected among the evaluated progenies at a 1% or 5% probability level using the F-test for all evaluated traits. Direct and indirect selection provided the greatest genetic gains. Among the selection índices, the highest total genetic gain were obtained using the Mulamba and Mock indices. The NDM and NDF traits contributed most to determining genetic diversity. The Tocher, UPGMA, and canonical variable analysis methods clusteres the genotypes in a similar manner, forming five groups in the summer crop and four groups in the winter crop. The S128P3 and S128P4 progenies presented short cycle and high yield, desirable characteristics for use in crossbreeding with divergent genotypes. Wed, 25 Feb 2026 00:00:00 GMT https://repositorio.ufu.br/handle/123456789/48756 2026-02-25T00:00:00Z