03.1 - Graduação (UAST)
URI permanente desta comunidadehttps://arandu.ufrpe.br/handle/123456789/2926
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Resultados da Pesquisa
Item Comportamento de sementes de Mimosa tenuiflora (Willd.) Poir, submetidas a aplicação do campo magnético e estresse salino(2023-04-24) Souza, Gleyson Rodrigues de; Silva Junior, Luiz Carlos da; http://lattes.cnpq.br/6998910214479890; http://lattes.cnpq.br/7632781944679348The influence of the magnetic field on living organisms is a question that intrigues humanity for centuries. The advancement of our knowledge in this area of science makes it possible for us to understand that the action of magnetism causes positive or negative effects in a series of organisms. In recent years, we have been searching for techniques that promote the best development of two plants that have gained proeminence on the entire planet, mainly for the reforestation of native areas. Considering that currently about 20% of the irrigated area suffers from saline stress, the present work sought to analyze the relationship between the intensity of two magnetic fields in comparison to different levels of salinity in the germination of Mimosa tenuiflora (Willd.) Poir. The work was developed in the Laboratory of Energy, Physics and Mathematics of UFRPE-UAST, in two stages. The first from November 20 to 23, 2022 and the second from February 14 to 25, 2023. Foram provided in the first stage four intensity treatments of magnetic field (0 T , 0, 1 T , 0, 14 T and 0, 45 T ) and three levels of salinity (1, 42 dS/m, 4, 01 dS/m and 4, 32 dS/m), for In the second stage, four treatments of magnetic field intensities (0 T , 0, 18 T , 0, 24 T and 0, 45 T ) and three salinity levels (8, 86 dS/m, 13, 78 dS/m and 13, 78 dS/m). In the case of the study on the effects of two different levels of salinity on the germination and development of plants, the choice of delineation in casualized blocks with two repetitions allowed the division of the experimental units in blocks, according to characteristics that could influence our results, such as the intensity of the magnetic field. The germination measurements were carried out daily, after four days of germination the radicle and hypocotyl capsules were measured. Our results show that: 1) In the first stage of the experiment, in the first 48 h, continuous exposure to the magnetic field at an intensity of 0, 1 T was able to attain 90% of germination in comparison with the control that has 80% for salinities of 1, 42 dS/m and 4, 01 dS/m and at a concentration of 4, 32 dS/m the germination rates decreased as the field increased. 2) The compression of the radicle for a salinity of 1, 42 dS/m obtains greater compression as the magnetic field increases. 3) In the second stage of the experiment, in the first 48 h, continuous exposure to the magnetic field at an intensity of 0, 1 T and 0, 45 T will achieve 10% germination reduction compared to the control that has 0% for a salinity of 13, 78 dS/m and at a concentration of 18, 41 dS/m only the seeds exposed to the field of 0, 1 T germinate at a taxa of 2, 5%. 4) In the same band of salinity of 8, 86 dS/m with the increase in field intensity to the radicle and the hypocotyl reaching larger compressions. Demonstrating that viii the application of the magnetic field influences the germination rate and the physiology of seedlings.The influence of the magnetic field on living organisms is a question that intrigues humanity for centuries. The advancement of our knowledge in this area of science makes it possible for us to understand that the action of magnetism causes positive or negative effects in a series of organisms. In recent years, we have been searching for techniques that promote the best development of two plants that have gained proeminence on the entire planet, mainly for the reforestation of native areas. Considering that currently about 20% of the irrigated area suffers from saline stress, the present work sought to analyze the relationship between the intensity of two magnetic fields in comparison to different levels of salinity in the germination of Mimosa tenuiflora (Willd.) Poir. The work was developed in the Laboratory of Energy, Physics and Mathematics of UFRPE-UAST, in two stages. The first from November 20 to 23, 2022 and the second from February 14 to 25, 2023. Foram provided in the first stage four intensity treatments of magnetic field (0 T , 0, 1 T , 0, 14 T and 0, 45 T ) and three levels of salinity (1, 42 dS/m, 4, 01 dS/m and 4, 32 dS/m), for In the second stage, four treatments of magnetic field intensities (0 T , 0, 18 T , 0, 24 T and 0, 45 T ) and three salinity levels (8, 86 dS/m, 13, 78 dS/m and 13, 78 dS/m). In the case of the study on the effects of two different levels of salinity on the germination and development of plants, the choice of delineation in casualized blocks with two repetitions allowed the division of the experimental units in blocks, according to characteristics that could influence our results, such as the intensity of the magnetic field. The germination measurements were carried out daily, after four days of germination the radicle and hypocotyl capsules were measured. Our results show that: 1) In the first stage of the experiment, in the first 48 h, continuous exposure to the magnetic field at an intensity of 0, 1 T was able to attain 90% of germination in comparison with the control that has 80% for salinities of 1, 42 dS/m and 4, 01 dS/m and at a concentration of 4, 32 dS/m the germination rates decreased as the field increased. 2) The compression of the radicle for a salinity of 1, 42 dS/m obtains greater compression as the magnetic field increases. 3) In the second stage of the experiment, in the first 48 h, continuous exposure to the magnetic field at an intensity of 0, 1 T and 0, 45 T will achieve 10% germination reduction compared to the control that has 0% for a salinity of 13, 78 dS/m and at a concentration of 18, 41 dS/m only the seeds exposed to the field of 0, 1 T germinate at a taxa of 2, 5%. 4) In the same band of salinity of 8, 86 dS/m with the increase in field intensity to the radicle and the hypocotyl reaching larger compressions. Demonstrating that the application of the magnetic field influences the germination rate and the physiology of seedlings.Item Crescimento e perfil bioquímico por espectroscopia no infravermelho de plântulas de mimosa tenuiflora com diversas intensidades do campo magnético(2023-04-26) Silva, Luiza Lopes da; Silva Junior, Luiz Carlos da; http://lattes.cnpq.br/6998910214479890The presence of a magnetic field (MF) can affect the biological conditions of plants. At certain intensity levels, it can cause damage to plant germination and growth. In this study, middle infrared (MIR) spectroscopy was used together with statistical treatments to identify changes in growth and biochemical profile in Mimosa tenuiflora (Willd.) Poir., seedlings exposed to magnetic fields at different intensities under controlled environments. The study was carried out at the Laboratory of Energy, Physics and Mathematics together with the Chemical Analysis Group at the Academic Unit of Serra Talhada. The species analyzed was chosen because it is native to the Caatinga. Spectral data were compared with biometric and physiological data, such as germination percentage (G), radicle length (RL), hypocotyl length (HL) and leaf morphometry (LM). M. tenuiflora seeds were placed in Petri dishes with qualitative filters and allocated in a BOD (Biochemical Oxygen Demand) incubator under controlled temperature (250C) and photoperiod (12h), and divided into two groups: closer to the light source (group C) and distant (group D). Samples of the seedlings (leaves, hypocotyl, and radicle) were subjected to MID spectroscopic analysis by attenuated total reflectance (ATR). RL, HL, and LM values decreased significantly (p<0.05) in the group closer to the light source compared to the control. Principal component analysis (PCA) of the spectral data of the samples allowed to see a significant distinction between the samples from group C and group D. Considering the analysis of samples that received an intensity of 0.24T for group C and 0.18T for group D, differences were noted in the range of 1200 to 1000cm−1 corresponding to C-O, C-H, and OH vibrations and in the range of 1050 and 1735cm−1 associated with C=O stretching bands, respectively. Together, the data suggest that MF acts differently on seedlings depending on the distance from the light source. Through MIR spectra it was possible to evaluate the composition and intensity of the bands and, when associated with statistical treatments (Student’s t-test and PCA), proved to be a promising and complementary tool for studying the effect of magnetic fields on plants in relation to the light source.