DSpace Communidade: Programa de Pós Graduação em Ciências Agrárias - Agronomia (PPGCA - AGRO)

FUNGOS ENTOMOPATOGÊNICOS PODEM ALTERAR O COMPORTAMENTO ALIMENTAR DE Euschistus heros EM SOJA?

2026-03-05T00:00:00Z

Título: FUNGOS ENTOMOPATOGÊNICOS PODEM ALTERAR O COMPORTAMENTO ALIMENTAR DE Euschistus heros EM SOJA? Autor(es): Oliveira, Guilherme Pereira de Primeiro Orientador: Soares, Frederico Antonio Loureiro Primeiro Membro da Banca: Velozo, Simone Graziele Moio Segundo Membro da Banca: Jesus, Flávio Gonçalves de Terceiro Membro da Banca: Boaventura, Heloiza Alves Abstract: The Neotropical brown stink bug, Euschistus heros, is one of the main pests of soybean, causing significant losses through feeding on pods and seeds. Understanding its feeding behavior is essential for the development of effective pest management strategies. Although entomopathogenic fungi have been widely studied as biological control agents, their effects on insect feeding behavior remain poorly understood. This thesis aimed to evaluate whether entomopathogenic fungi are capable of altering the feeding behavior of E. heros in soybean. To address this question, three complementary studies were conducted, integrating statistical modeling, behavioral analysis using electropenetrography (EPG), and seed damage assessment. The first study focused on the statistical modeling of EPG data, which are characterized by correlated and overdispersed count variables. A multinomial-based approach showed superior performance, with appropriate control of type-I error rates (≈ 0.05) and higher statistical power (> 0.80), whereas conventional models such as Poisson exhibited inflated error rates (> 0.40). The second study evaluated the feeding behavior of E. heros exposed to Cordyceps javanica and Metarhizium anisopliae using EPG. Significant changes (p < 0.05) were observed, including reductions in stylet penetration (Eh1) and ingestion events (Eh2 and Eh3b), increased non-feeding time (Z), and a reduction in the final time of the last probe (FTLP), from 44.09 ± 4.13 h in the control to approximately 31 h in fungal treatments. The third study linked these behavioral changes to seed damage. X-ray analysis revealed a significant reduction in internal seed damage (p < 0.05), from 65.5% in the control to 27.8% for M. anisopliae and 34.4% for C. javanica. Overall, the results demonstrate that entomopathogenic fungi are capable of altering the feeding behavior of Euschistus heros in soybean by reducing the frequency, duration, and continuity of feeding events. Editor: Instituto Federal Goiano Tipo: Tese

MICRO-ORGANISMOS PROMOTORES DO CRESCIMENTO VEGETAL PARA REDUÇÃO DA FERTILIZAÇÃO FOSFATADA EM SOJA E MILHO.

2025-09-05T00:00:00Z

Título: MICRO-ORGANISMOS PROMOTORES DO CRESCIMENTO VEGETAL PARA REDUÇÃO DA FERTILIZAÇÃO FOSFATADA EM SOJA E MILHO. Autor(es): Santos Junior, Jeronymo Pereira dos Primeiro Orientador: Souchie, Edson Luiz Primeiro Membro da Banca: Carlos, Leandro Segundo Membro da Banca: Ribeiro Neto, Moacir Abstract: With the expansion of agricultural frontiers and the migration of rural producers to the Cerrado, Brazil starts to break production records every agricultural year, mainly with soybean and corn crops. However, for this to happen, a great deal of research and technological development was necessary, especially in agricultural soil fertility management. The objective of this study was to evaluate the efficiency of different microbial consortia under different levels of phosphate fertilization in soybean and corn crops grown in the Cerrado. Two field trials (soybean and corn) were carried out in the 2023/24 summer harvest at the IF Goiano Experimental Area – Rio Verde Campus, GO. Both trials were randomized block designs, 3 x 5 factorial scheme (three levels of phosphate fertilization: 0, 50, and 100% of the recommended P dosage and five inoculation treatments: Azospirillum brasilense, Pseudomonas fluorescens, Azospirillum + Pseudomonas, Bacillus sp. + Paraburkholderia sp. and Priestia megaterium + Bacillus subtilis), with four replicates. Thirty-five days after emergence, in both trials, the following were evaluated: dry mass of the aerial part, roots, N and P contents in the aerial part and roots. For soybeans, the number and dry mass of nodules were also evaluated. At harvest, in both trials, the following were analyzed: mass of 1000 grains, N and P contents in the grains, and grain yield. The agronomic effectiveness of co-inoculation was proven to be a superior strategy, i.e., the combination of Priestia megaterium and Bacillus subtilis, or Bacillus and Paraburkholderia sp., or Azospirillum brasilense and Pseudomonas fluorescens is more favorable to soybean nutrition, growth, and productivity than isolated inoculation. Co-inoculation technologies (A. brasilense + P. fluorescens, Bacillus sp. + Paraburkholderia sp., and P. megaterium + B. subtilis) favor low-input systems as well as those aimed at optimizing the efficiency of conventional industrial phosphate fertilizers. The microbial isolates tested here as growth promoters acted synergistically and maximized the efficiency of phosphate fertilization in soybean crops. In corn cultivation, similarly, the co-inoculation of Priestia megaterium + Bacillus subtilis, or Bacillus sp. + Paraburkholderia sp., or even Azospirillum brasilense + Pseudomonas fluorescens enhanced corn productivity compared to the isolated inoculation of A. brasilense or P. fluorescens. Co-inoculation technologies (A. brasilense + P.fluorescens, Bacillus sp. + Paraburkholderia sp., and P. megaterium + B. subtilis) favored low-input systems as well as those aimed at optimizing the efficiency of conventional industrial phosphate fertilizers. Editor: Instituto Federal Goiano Tipo: Dissertação

A POLINIZAÇÃO PELA ABELHA TETRAGONISCA ANGUSTULA MELHORA A QUALIDADE DO MORANGO EM CASA DE VEGETAÇÃO INDEPENDENTE DA SUPLEMENTAÇÃO LUMINOSA

2026-02-20T00:00:00Z

Título: A POLINIZAÇÃO PELA ABELHA TETRAGONISCA ANGUSTULA MELHORA A QUALIDADE DO MORANGO EM CASA DE VEGETAÇÃO INDEPENDENTE DA SUPLEMENTAÇÃO LUMINOSA Autor(es): Lemos, Artur Simão Primeiro Orientador: Silva, Fabiano Guimarães Primeiro Membro da Banca: Silva, Fabiano Guimarães Segundo Membro da Banca: Sales, Juliana de Fátima Terceiro Membro da Banca: Moura, Altair Dias de Abstract: The sustainable intensification of agricultural production in protected environments demands the integration of management technologies and pollination services, especially those provided by stingless bees. This study aimed to evaluate the effects of LED supplemental lighting on the foraging behavior of the stingless bee Tetragonisca angustula (Hymenoptera: Apidae; Meliponini) and its interactions with pollination services, plant physiological performance, and fruit quality of the strawberry (Fragaria × ananassa Duch., cv. ‘San Andreas’) grown in a greenhouse. The hypothesis was that pollination by T. angustula improves the physiological and productive performance of the strawberry, while LED supplemental lighting modulates photosynthetic and metabolic processes without compromising bee behavior. The experiment was conducted in a completely randomized design, combining pollination conditions (open pollination and spontaneous self-pollination) with and without LED supplemental lighting. Bee behavior, gas exchange, chlorophyll a fluorescence, fruit morphological attributes, physicochemical parameters, and bioactive compound profiles were evaluated, in addition to multivariate analysis using self-organizing maps. Supplemental lighting did not alter the frequency of floral visitation by the bees. Conversely, bee visitation (open pollination) promoted an increase in photosynthetic efficiency, water use, and the strengthening of the source-sink relationship, resulting in larger fruits and changes in phenolic compound concentrations. In contrast, plants without bee visitation (self-pollination) showed higher energy dissipation, lower weight and length, and higher total soluble solids content, suggesting metabolic rearrangements under lower reproductive demand. Supplemental lighting acted as a complementary factor, with effects depending on the variable evaluated. It is concluded that functional efficiency and fruit quality in protected systems primarily depend on biotic pollination, while artificial lighting should be employed as a support tool to stabilize the production environment, especially in light-limited scenarios. The results contribute to the formulation of ecological intensification strategies in protected cultivation systems, reconciling productivity, quality, and sustainability. Editor: Instituto Federal Goiano Tipo: Dissertação

ANÁLISE RADIOGRÁFICA E MULTIESPECTRAL NA AVALIAÇÃO DA QUALIDADE DE SEMENTES DE Handroanthus impetiginosus

2026-03-11T00:00:00Z

Título: ANÁLISE RADIOGRÁFICA E MULTIESPECTRAL NA AVALIAÇÃO DA QUALIDADE DE SEMENTES DE Handroanthus impetiginosus Autor(es): Oliveira, Alessandra Mathias Primeiro Orientador: Sales, Juliana de Fátima Primeiro Membro da Banca: Teixeira, Marconi Batista Segundo Membro da Banca: Rodrigues, Arthur Almeida Terceiro Membro da Banca: Silva, Ingrid Maressa Hungria de Lima Abstract: Image analysis techniques are non-destructive, rapid, and objective alternatives to evaluate the quality of forest seeds. The lack of fast methods that do not compromise the seed for assessing the physiological quality of forest seeds hinders the efficiency of reforestation and conservation programs. Thus, the objective of this work was to evaluate the quality of purple ipe seeds (Handroanthus impetiginosus) using X-ray and multispectral image analysis techniques, integrated with physiological and morphometric parameters, to validate these complementary methodologies. Initially, with the seeds identified and numbered, radiographic images were obtained to classify the seeds into three classes according to the degree of filling of the embryonic cavity. Subsequently, with the same seeds, multispectral images were acquired in the near-infrared bands (880, 940, and 970 nm). With the seedlings from the emergence test, gas exchange analysis and chlorophyll A and B measurement were performed. Tests such as germination, seedling length, and electrical conductivity were also carried out. Subsequently, multivariate analysis of the data was performed using Principal Component Analysis (PCA). It was concluded that 80% of the evaluated seeds presented embryonic cavity filled by more than 50% (Class 1), corresponding to seeds that originated normal seedlings, while seeds with partial or absent filling were associated with abnormal seedlings and non-viable seeds, respectively. Viable seeds showed lower reflectance in NIR bands, a pattern associated with higher lipid content in tissues, and PCA efficiently integrated spectral, germinative, and photosynthetic variables, explaining 70.98% of the total variance in the first two components. Editor: Instituto Federal Goiano Tipo: Dissertação