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Indutor de resistência e remineralizador de solo como promotores de crescimento, clorofilas e metabolismo antioxidante em café arábica

2026-03-10T06:04:19Z

Título: Indutor de resistência e remineralizador de solo como promotores de crescimento, clorofilas e metabolismo antioxidante em café arábica Autor(es): Silva, Jheyson Eick Dantas da Orientador: Podestá, Guilherme Silva de Abstract: Brazilian coffee farming faces growing challenges related to plant tolerance to environmental and biological stresses. The search for sustainable solutions that increase the resilience of coffee trees is fundamental to the development of the crop. In this context, the objective was to evaluate the growth, indices, and fluorescence of chlorophyll, as well as the antioxidant metabolism of Arabica coffee under the application of a resistance inducer and soil remineralizer. A randomized block design was used, with four treatments: control (T1), Cos- OGA inducer (T2), remineralizer (T3), and inducer + remineralizer (T4), four replicates, six plants per plot with four useful plants, totaling 96 plants. The Catucaí Amarelo 24/137 Arabica coffee variety was cultivated. The resistance inducer was applied via foliar spraying every 15 days for 3 months, while the remineralizer was applied in planting holes. In the first week of the experiment, plant growth analyses were performed, including plant height, stem diameter, crown diameter, and number of branches. Thirty days after the last application, the activities of the enzymes peroxidase, polyphenoloxidase, and phenylalanine ammonia-lyase were evaluated, in addition to the levels of chlorophyll a, b, and total chlorophyll and chlorophyll fluorescence. Treatment with the isolated elicitor reduced plant growth. The remineralizer showed vegetative vigor similar to the control treatment, while the combination of the two products partially mitigated the elicitor's performance, promoting greater biochemical preparation without significantly compromising growth. Enzyme activity showed no differences between treatments. An increase in chlorophyll content and photochemical efficiency of photosystem II was observed, especially with the combined treatment, indicating greater photosynthetic efficiency and potential plant resistance. Thus, the association between elicitor and remineralizer shows promise for coffee plants, requiring careful evaluation by producers regarding the balance between growth and defense, according to the specific conditions of cultivation. Editor: Universidade Federal da Paraíba Tipo: TCC

Perda de água pós-colheita em frutos de pimenteira

2026-03-10T06:04:16Z

Título: Perda de água pós-colheita em frutos de pimenteira Autor(es): Moura, Thiago Alves Orientador: Rêgo, Elizanilda Ramalho do Abstract: The genus Capsicum is among the most commercially traded vegetables worldwide, presenting a wide range of uses. However, peppers suffer from high post-harvest water loss at all stages of ripening. However, methods to reduce loss due to storage conditions have not contributed to a fundamental solution. Thus, it is necessary to seek mechanisms that alleviate the high-water loss during the genetic improvement process. In this context, the present study aimed to characterize fruits from different pepper accessions regarding water loss during storage, aiming to provide support for post-harvest conservation strategies and for the selection of promising genotypes in genetic improvement programs. The experiment was conducted at the Plant Biotechnology Laboratory of UFPB, in Areia-PB, using eleven Capsicum annuum accessions belonging to the Germplasm Bank. The fruits of the accessions were placed in polystyrene trays. The accessions were arranged in a split-plot design, composed of 11 accessions in 9 periods. Each treatment consisted of four replicates, with five fruits per replicate, arranged in a completely randomized design. For morpho-agronomic characterization, the quantitative characteristic of initial/final fruit weight was considered, followed by the calculation of water loss (%). The percentage of water loss was estimated daily until the ninth day, the period in which total post-harvest quality loss was observed in at least one of the genotypes. The data obtained in the evaluation were subjected to analysis of variance. The Scott-Knott test (p ≤ 0.01) was applied to compare the genotypes within each day, and for each genotype over the days, a polynomial regression analysis was performed. Subsequently, an analysis of all genotypes was performed using a scatter plot at eighteen days, when all genotypes showed total dehydration. There was a significant interaction between accessions and time for the analyzed variable (p ≤ 0.01). The heritability value (77.79%) was high for the trait. The Scott-Knott test revealed distinct behaviors among the genotypes over nine days. Genotypes 50, 93, 129, and 276 registered the lowest water loss rates, while genotype 294 showed the highest loss. Regression analysis revealed increasing water loss for all genotypes. A high coefficient of determination (R2 > 0.90) was observed for most genotypes: 12, 93, 129, 215, 276, 276, 284, 292, 294, and 298. Genotype 93 exhibited the smallest slope in the trend line, followed by genotypes 276 and 284. Genotypes 50, 93, 129, and 276 showed the lowest water loss rates. Genotype 294 showed the greatest water loss. Genotype 93 showed the lowest percentage of water loss, followed by genotypes 276 and 284. Crossing between these accessions is recommended in order to obtain hybrids and/or lines in segregating generations that have lower post-harvest water loss. Editor: Universidade Federal da Paraíba Tipo: TCC

Componentes morfoagronômicos de algodão colorido sob diferentes doses de adubação mineral

2026-03-10T06:03:59Z

Título: Componentes morfoagronômicos de algodão colorido sob diferentes doses de adubação mineral Autor(es): Santana, Pedro Ian Maia Orientador: Mielezrski, Fabio Abstract: Cotton is a fiber of great global importance, essential for the textile industry. In Brazil, colored cotton production, especially in the Northeast region, is emerging as a sustainable alternative to dyeing white fiber, a practice that can generate environmental impacts and health risks. Therefore, adequate nutritional management is essential to ensure fiber productivity and quality while minimizing soil damage. This study aimed to evaluate the effect of different mineral fertilizer doses on the morphoagronomic characteristics of two colored cotton cultivars in the Brejo region of Paraíba. The experiment was conducted in a dryland system in the experimental area of the Federal University of Paraíba (UFPB), Campus II, in the city of Areia, Paraíba state. A randomized block experimental design in a 2 x 4 factorial scheme was used, with two colored cotton cultivars (BRS Jade and BRS Rubi) and four fertilizer doses (0%, 50%, 100% and 150% of the recommendation), with three replicates. Plant height, height of insertion of the first fruiting branch, stem diameter, number of fruiting branches per plant, number of bolls per plant and productivity were evaluated. Analysis of variance revealed that, among the cultivars, there were significant differences (p < 0.05) for the height of insertion of the first fruiting branch and number of fruiting branches per plant, in addition to a significant difference (p < 0.01) for productivity. Regarding fertilization, significance (p < 0.05) was observed for the number of fruiting branches per plant and productivity, as well as significance (p < 0.01) for plant height and fruiting branch insertion height. The dose corresponding to 100% of the nutritional recommendation was as effective as the 150% dose, which did not result in significant gains in colored cotton production in the semiarid region of Paraíba. The cultivar BRS Jade showed greater vegetative vigor and productivity than BRS Rubi. Editor: Universidade Federal da Paraíba Tipo: TCC

Crescimento de cultivares de coffea arabica L. em Areia - PB

2026-02-05T06:08:45Z

Título: Crescimento de cultivares de coffea arabica L. em Areia - PB Autor(es): Silva, Thiago Gomes da Orientador: Podestá, Guilherme Silva de Abstract: Coffee is one of the most important agricultural crops in the world. Within the Coffea genus, the species Coffea arabica L. and Coffea canephora are the most prominent on the global stage. For a detailed understanding of the adaptation of different coffee cultivars, it is necessary to understand how edaphoclimatic conditions can influence the development of the crop in a specific region. Therefore, the study aimed to verify the growth of six Coffea arabica L. cultivars at the Canada farm located in the municipality of Areia - PB. The variables evaluated were plant height, stem diameter, canopy diameter, number of plagiotropic branches, leaf area, length of the plagiotropic branch, number of nodes on the plagiotropic branches, and diameter of the plagiotropic branch. The data were subjected to analysis of variance, with means compared using Tukey's test at a 5% probability level. Among the six evaluated cultivars, Catuaí Vermelho IAC 144 and Catucaí Amarelo 24/137 stood out significantly for exhibiting the highest average values for plant height, surpassing the other cultivars. Regarding canopy diameter, the cultivar Catuaí Vermelho IAC 144 demonstrated superior performance compared to the other treatments. Thus, in terms of vegetative development, the cultivars Catuaí Vermelho IAC 144 and Catucaí Amarelo 24/137 stand out for showing the best performance. Editor: Universidade Federal da Paraíba Tipo: TCC