https://repositorio.ifgoiano.edu.br/handle/prefix/5853 2026-05-11T12:42:42Z https://repositorio.ifgoiano.edu.br/handle/prefix/6568 Título: O PAPEL DAS BACTÉRIAS PRODUTORAS DE ÁCIDO INDOLACÉTICO (AIA) NO ENRAIZAMENTO E CRESCIMENTO VEGETAL Autor(es): Silva, Danilo Ferreira Primeiro Orientador: Oliveira, Patrícia Rasteiro Ordiale Abstract: Indoleacetic acid (IAA) is the main natural auxin involved in regulating plant growth-promoting bacteria. In recent years, the scientific community has focused its attention on the use of plant growth-promoting bacteria (PGPB), especially those capable of producing IAA, as a sustainable alternative to stimulate germination, rooting, and development in different plant species. This review brings together evidence from studies demonstrating the effectiveness of these bacteria in various agricultural crops and plant species, including vegetables and plants propagated by cuttings or micropropagation. Among the microorganisms most cited in the literature are species of the genera Rhizobium, Bacillus, Pseudomonas, Enterobacter, Pantoea, Burkholderia, and Azospirillum, recognized for their ability to synthesize IAA and promote plant growth. The results analyzed indicate that, when well selected, these bacteria have the potential to improve root development, promote nutrient absorption, and contribute to increased plant vigor, potentially reducing the use of synthetic inputs partially or totally. However, some studies indicate that excessive concentrations of IAA can cause negative physiological effects, highlighting the importance of proper management of these microorganisms. It is concluded that the rational use of AIA-producing bacteria represents a promising strategy for strengthening Editor: Instituto Federal Goiano Tipo: Trabalho de Conclusão de Curso 2026-03-27T00:00:00Z https://repositorio.ifgoiano.edu.br/handle/prefix/6563 Título: O USO DE MICRORGANISMOS NA MITIGAÇÃO DE MICOTOXINAS Autor(es): Pires, Marcela Monize Oliveira de Faria Primeiro Orientador: Paz Filho, Erasmo Ribeiro da Primeiro Membro da Banca: Vaz, Aline Brito Segundo Membro da Banca: Souza, Tenille Ribeiro de Abstract: Mycotoxins are secondary metabolites produced by filamentous fungi such as Aspergillus, Fusarium, and Penicillium that contaminate grains, cereals, and other plant-based foods, posing serious risks to human and animal health as well as significant economic losses. Given the limitations of conventional physical and chemical methods for mycotoxin control, the use of microorganisms has emerged as a promising and sustainable biotechnological alternative. In this context, the general objective of this study was to analyze the use of microorganisms in combating mycotoxins, emphasizing their mechanisms of action, effectiveness, and potential application within the food and feed production chain. The methodology consisted of a descriptive and analytical literature review based on the selection of scientific articles, books, and technical documents published in recognized databases such as Scopus, PubMed, and SciELO. Studies addressing the use of bacteria, yeasts, and fungi with the capacity for adsorption, biotransformation, or degradation of mycotoxins were included, with priority given to recent publications. Data analysis was conducted qualitatively in order to identify patterns, recurring findings, and gaps in the scientific knowledge on the subject. The main results indicate that several microorganisms exhibit high efficiency in mycotoxin control. Lactic acid bacteria, such as Lactobacillus and Bifidobacterium, demonstrate the ability to adsorb mycotoxins on their cell walls, thereby reducing their bioavailability. Yeasts, particularly Saccharomyces cerevisiae, stand out for their physical binding to toxins and their practical application as feed additives. In addition, certain microorganisms possess specific enzymes capable of degrading mycotoxins into less toxic compounds, as observed in bacterial and fungal species with biotransformation activity. The analyzed studies report significant reductions in toxicity, improved food safety, and lower environmental impact when compared to traditional methods. It is concluded that the use of microorganisms in combating mycotoxins represents an effective, safe, and environmentally sustainable strategy with great potential for industrial application. Despite these advances, further studies are required to standardize microbial strains, evaluate their stability in different food matrices, and validate their effectiveness on an industrial scale. Therefore, microbial biotechnology represents a strategic field for the development of innovative solutions in mycotoxin control and the promotion of food safety. Keyword: Mycotoxins. Biocontrol. Microorganisms. Editor: Instituto Federal Goiano Tipo: Trabalho de Conclusão de Curso 2026-03-23T00:00:00Z https://repositorio.ifgoiano.edu.br/handle/prefix/6524 Título: POTENCIAL DE Pantoea agglomerans COMO BIOFERTILIZANTE NA CULTURA DO MILHO (Zea mays L.): UMA REVISÃO DE ESCOPO Autor(es): Santos, Leidiomar Rodrigues Abstract: Modern agriculture faces the challenge of reducing dependence on mineral phosphate fertilizers, which are finite resources and often exhibit low efficiency due to rapid immobilization in the soil. In this context, phosphorus-solubilizing microorganisms have emerged as a biotechnological alternative to promote more sustainable production systems. The present study consists of a scoping review aimed at mapping and synthesizing the available scientific evidence regarding the use of the bacterium Pantoea agglomerans as a biofertilizer in maize cultivation. The methodology involved a bibliographic survey in the Web of Science and Scopus databases, resulting in the selection of 15 articles for detailed analysis. The results demonstrate that P. agglomerans acts as a multifunctional plant growth-promoting bacterium (PGPB), employing mechanisms such as the solubilization of phosphorus, zinc, and potassium, the production of phytohormones (especially indole-3-acetic acid – IAA), and biological nitrogen fixation. The application of this bioinput in maize resulted in significant increases in biomass, plant nutritional content, and grain yield, in addition to contributing to tolerance to abiotic stresses such as drought and salinity. It is concluded that P. agglomerans has high potential for inclusion in commercial biofertilizers. However, there are still knowledge gaps related to performance consistency under field conditions and the need for large-scale studies to validate its commercial effectiveness. Editor: Instituto Federal Goiano Tipo: Outro 2026-03-26T00:00:00Z https://repositorio.ifgoiano.edu.br/handle/prefix/6520 Título: AVALIAÇÃO DO POTENCIAL BIOHERCIDA DO ÓLEO ESSENCIAL DAS FOLHAS DE Eugenia dysenterica (Mart.) DC Autor(es): Vilela, Ailyn de Oliveira Primeiro Orientador: Burger, Marcela Carmen de Melo Abstract: Weed control represents a critical challenge in agriculture, accounting for estimated losses of about 34% in global productivity. Although the use of synthetic herbicides remains the predominant strategy, increasing environmental concerns and the emergence of resistance in invasive plants have driven the search for bioherbicides based on natural metabolites. In this context, essential oils emerge as promising sources of phytotoxic compounds capable of interfering with vital processes such as photosynthesis. The present study evaluated the bioherbicidal potential of the essential oil from the leaves of Eugenia dysenterica (Mart.) DC, a species native to the Brazilian Cerrado with recognized ecological and phytochemical relevance. The plant material was collected in Rianápolis, Goiás, Brazil, and the oil was extracted by hydrodistillation. Chemical characterization was performed using GC/MS and revealed the predominance of (E)- caryophyllene, myrcene, α-humulene, β-selinene, and (E)-β-ocimene. Phytotoxic activity was analyzed through chlorophyll a fluorescence assays in leaf discs of Spinacia oleracea. The results demonstrated that the essential oil of E. dysenterica causes severe damage to the photosynthetic apparatus in a dose-dependent manner, through a drastic reduction in performance indices (PIABS and PICSo) and in electron transport flux (ET0/CS0), as well as through the deactivation of reaction centers (RC/CS0). At concentrations above 100 mg L-1, its efficacy was comparable to the commercial herbicide DCMU. The inhibitory effects suggest direct interference with Photosystem II (PSII), possibly through blockage of electron transport at the quinone acceptor site. Therefore, it is concluded that the essential oil of E. dysenterica has significant potential for the development of bioinputs aimed at the sustainable management of weeds, combining biological efficiency with reduced environmental impacts. Editor: Instituto Federal Goiano Tipo: Trabalho de Conclusão de Curso 2026-03-25T00:00:00Z