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 Avaliação da germinação e crescimento inicial de plântulas de Lactuca sativa L. expostas à polivinilpirrolidona(2022-05-27) Sales, Érica Danúbia Souza; Nunes, Ramom Rachide; http://lattes.cnpq.br/6182302726895126; http://lattes.cnpq.br/3843458808851603Seed germination is a crucial moment for plant development and growth, once the species has suffered any kind of injury, excess or scarcity, the consequences can be permanent. Thus, the present work aims to evaluate the germination of Lactuca sativa L. (lettuce) in different concentration of polyvinylpyrrolidone polymer (PVP). Seed sowing (30/plate) was conducted in sterilized Petri dishes containing filter paper. In each plate, 3mL of the aqueous PVP solution was added at concentrations 0.001 mmol/L, 0.01 mmol/L, 0.1 mmol/L, 1 mmol/L and a control group with distilled water. Each treatment had 3 replicates. Seed germination was evaluated daily, at the end of the 7th day, measurements of hypocotyl length, radicle, fresh and dry mass weight, germination percentage tests, vigor index, tolerance, germination speed, water content and photosynthesizing pigments were performed.. The data were expressed in mean ± standard error and submitted to one way ANOVA followed by the Tukey test (the means were considered different when p<0.05). The group treated with 1 mmol/L presented the radicle development affected, while all others did not present major impacts. %G, IVG, IT, hypocotyl and photosynthetic pigments did not present significant results when compared to the control group. Our data indicates a warning sign for the polyvinylpyrrolidone disposal, and highlights the need of further research regarding its toxicity.Item Avaliação da germinação e do crescimento inicial de plântulas de Lactuca sativa L. expostas ao cloreto de alumínio em microambiente(2019) Pádua, Lisandra Celeste da Silva; Saraiva, Rogério de Aquino; http://lattes.cnpq.br/6812072552819682; http://lattes.cnpq.br/1077354209259707Aluminum when in low soil concentrations can promote growth or even other benefits to plants. However, in acidic soils (pH <5) this metal can cause phytotoxic effects on plants, becoming one of the limiting factors for their growth. The present study aimed to evaluate the phytotoxicity of aluminum chloride (AlCl3) on the germination and initial development of Lactuca sativa L. For this purpose, aqueous solutions of AlCl3 were prepared at concentrations of 0 mg.L-1, 5 mg.L-1,10 mg.L-1, 50 mg.L-1 and 100 mg.L-1. Followed by the application of 3 mL of each solution in Petri dishes containing 25 lettuce seeds each, germinated in a B.O.D (Biochemical Oxigen Demand) chamber lasting seven days. The parameters used to evaluate Al phytotoxicity were: root length, hypocotyl and total, root diameter, NSG / day, IVG, vigor, IT chlorophyll and carotenoid contents and physicochemical parameters. Considering the phytotoxic effects of aluminum demonstrated by the reduction in root size, hypocotyl, total length and increase of root diameter of the seedlings that received the aluminum treatments, the seedlings that received the treatment with the highest concentration showed to be less tolerant to aluminum, however germination, IVG, vigor and chlorophyll and carotenoid contents were not negatively affected by aluminum. Thus it can be concluded that aluminum, despite causing root damage, was not sufficient to inhibit the initial development of lettuce seedlings.Item Armazenamento de sementes de angico de bezerro (Piptadenia moniliformis Benth.)(2019) Silva, Elania Freire da; Pinto, Monalisa Alves Diniz da Silva Camargo; http://lattes.cnpq.br/0446410743186066; http://lattes.cnpq.br/6644267105942189Item Avaliação do potencial alelopático de Chloroleucon foliosum (Benth) G. P. Lewis sobre a germinação e crescimento inicial de alface(2019) Silva, Sara de Souza; Saraiva, Rogério de Aquino; http://lattes.cnpq.br/6812072552819682; http://lattes.cnpq.br/0125367619888442Chloroleucon foliolosum(Benth.) G. P. Lewis is a native tree from Caatinga commonly known as "arapiraca" and important to the timber industry and in folk medicine. However, there are few studies aimed at the possible impactscaused by the plant residues when those are released into the environment. Thus, this work aimed to evaluate the allelopathic effect of C. foliolosumleaf and stem ethanolic extracts (EFCF and ECCF, respectively) on germination and initial growthof lettuce (Lactuca sativaL.) seedlings. After collectionof the plant material, the ethanolic extracts were prepared from 50% ethanol. The qualitative phytochemical characterization of EFCF and ECCF was performed according to the methodology of Matos (1997). Thegermination assay was performed in microenvironments consisting of previously sterilized Petri dishes containing filter paper as substrate, containing lettuce seeds. The extracts were tested in concentrations of 1 mg/L, 10 mg/L, 100 mg/L, 1000 mg/L and 10,000 mg/L, as well asthecontrolgroup (distilled water), performed inquadruplicate. After 7 days of germination, was performedthe radicles and aerial parts morphometry, and the calculation of the rate of germination (IVG). The means were submitted to one-way ANOVA followed by the Tukey test and the differences between the treatments were considered significant for the P value <0.05. For both extracts, concentrations equal to or greater than 100 mg/L of EFCF were able to negatively affect lettuce growth,according to the length of radicle and shoot and IVG when compared to control. In phytochemical prospecting, both extracts have alkaloids and tannins; saponins, anthraquinone and catechins in ECCF, and flavonoids and phenolic compounds in EFCF. Therefore,the compounds contained in the extracts can generate different responses, so that the literature indicates that certain alkaloids and some phenolic compounds may be cytotoxic, having their effect enhanced by the presence of saponins and tannins, which mayassociate with the cell wall and facilitate the entryof allelochemicals. Considering the importance of the development of new technologies for the use of Caatinga plants, the study withextracts of C. foliolosumshow high toxicity in the concentrations tested (except 1 mg/L of ECCF), so that the,increase in theconcentrationpotentializedthe effect.Item Aspectos fisiológicos de sementes de Piptadenia moniliformis Benth(2019) Silva, Joyce Naiara da; Silva, Monalisa Alves Diniz da; http://lattes.cnpq.br/0446410743186066; http://lattes.cnpq.br/3432689640499564With the increasing demand for seeds of high quality native forest species, mainly to support the work of mixed reforestation, it is fundamental that the methods of quality evaluation of the seeds are efficient, so the present work aimed to evaluate aspects pertinent to the physiological quality of seeds of Piptadenia moniliformis Benth. (calico angus). Two experiments were carried out: experiment 1 -Use of seed dormancy overcoming treatments, where they were immersed in concentrated sulfuric acid by (zero -intact seeds, 5, 10, 15, 20 and 25 minutes). The design was a completely randomized design, with six treatments and five replicates of 20 seeds per treatment. Experiment 2 -Evaluation of the methodology of the accelerated aging test, that is, traditional methodology and that employing the use of saturated NaCl solution at 41ºC with periods of zero exposure; 24; 48; 72 and 96 h. Before and after each aging period, regardless of the method, the water content of the seeds was determined. After each treatment the seeds were submitted to electrical conductivity and germination tests. The design was completely randomized, in a 2x5 factorial scheme (methodology x exposure times), with four replicates of 25 seeds per treatment. To overcome seed dormancy there was no statistical difference between the times of 5; 10; 15; 20 and 25 minutes of immersion in sulfuric acid, but the time of 20 minutes provided a larger number of seeds with protrusion of the primary root. The different methods of accelerated aging, conventional and saturated solution, affected the physiological quality of seeds of Piptadenia moniliformis Benth., With the reduction of the germinative potential after 24 hours of exposure. Regarding the methodology employed, the use of the saturated solution generally gave the best results, as the water content of the seeds was lower, thus reducing fungal growth. The results obtained in the biochemical test of electrical conductivity showed that the increase of the aging period, independent of the methodology, caused the increase of the deterioration of the seeds. It is soon concluded that the seeds of P. moniliformis Benth. had their dormancy overcome when immersed in concentrated sulfuric acid for periods of 5; 10; 15; 20 or 25 minutes; and that the different methodologies of accelerated aging, traditional and saturated solution, affected the physiological quality of the seeds.