01. Universidade Federal Rural de Pernambuco - UFRPE (Sede)
URI permanente desta comunidadehttps://arandu.ufrpe.br/handle/123456789/1
Navegar
11 resultados
Resultados da Pesquisa
Item Memória hídrica (stress imprint) em sementes: impacto ecofisiológico na germinação e no crescimento inicial de Sesbania virgata (Cav.) Poir(2024-03-11) Menezes, Mariane Oliveira; Santos, Marcone Moreira; Silva, Carlos Luiz da; http://lattes.cnpq.br/9191002336120487; http://lattes.cnpq.br/3284707164193715; http://lattes.cnpq.br/1484285198376822The present study investigated the effects of hydraulic memory on the eco-physiological aspects of germination and the initial development of S. virgata seedlings. Employing a mixed-method approach that combined quantitative and qualitative methods, along with rigorous statistical analysis including tests such as Tukey, ANOVA, and regression analysis, a randomized experiment with various treatments was conducted. Initially, a literature review was conducted to understand the species' importance and the effects of hydraulic memory. Subsequently, laboratory tests were performed to overcome seed dormancy, determine moisture content, and establish the imbibition curve. Additionally, the germination rate of seeds subjected to polyethylene glycol 6000 (PEG 6000) solution was evaluated to simulate water stress, both with seeds that underwent intermittent hydration cycle (IHC) and those that did not undergo this process. Following laboratory analyses, nursery analyses were conducted with two distinct treatments (seeds subjected to IHC and seeds that did not undergo this process), under different watering regimes. Evaluated parameters included shoot height and diameter, root size, dry and fresh weight, Dickson's quality index, biomass allocation, and seedling survival rate. The results indicated the possible presence of hydraulic memory in the seedlings and demonstrated that water deficit negatively affects germination. However, intermittent hydration showed a positive effect on seed germination under water deficit conditions, offering a promising strategy to enhance plant survival in adverse environments.Item Germinação de sementes de Moringa oleifera Lam. sob diferentes concentrações de cloreto de potássio(2024-03-08) Souza, Danilo Nunes Lemos Santos de; Lima, Elifábia Neves de; http://lattes.cnpq.br/6117763430610324; http://lattes.cnpq.br/3607823032961358This study investigates the impact of salt stress on the germination and initial growth of Moringa oleifera LAM., a plant recognized for its nutritional and medicinal properties. The introduction contextualizes the importance of Moringa oleifera and highlights the relevance of studying the effects of saline stress in agricultural environments affected by soil salinization. The experiment evaluated the response of seedlings subjected to saline stress, comparing seeds presoaked in water for 24 hours with those not soaked. Carried out under controlled laboratory conditions, the experiment lasted 15 days, with seeds subjected to different saline solution treatments with Kcl. The concentrations used were Kcl 0.04 M, Kcl 0.08 M and Kcl 0.12 M. The variables analyzed included germination percentage, germination speed index, hypocotyl and main root length. The results indicated that saline stress negatively impacts germination and growth, with a significant reduction in treatments with higher saline concentrations. This study reinforces the importance of understanding the resistance mechanisms of Moringa oleifera to saline stress for the development of sustainable agricultural practices in areas affected by salinity. Contributes to scientific knowledge about plant tolerance to adverse conditions, guiding future research to improve crop resilience in saline environments.Item Proposta de sequência didática como ferramenta de intervenção no processo de ensino-aprendizagem de nanociência e nanotecnologia a estudantes do ensino médio(2024-02-27) Silva, Margarete Fernandes da; Vila Nova, Suzana Pereira; Luz, Leonis Lourenço da; http://lattes.cnpq.br/8952196044903176; http://lattes.cnpq.br/7716018904442218; http://lattes.cnpq.br/1578167238157111Given the growing evolutionary scenario of science and technology to which contemporary society is subjected, it is essential to approach new technological concepts in educational training. In this panorama, special emphasis must be given to Nanoscience and Nanotechnology studies, since this area of science has been increasingly present in the most diverse fields of the economy and the energy, industrial and agricultural sectors due to its high applicability. and the generation of new products, also providing effects on people's quality of life. As it is a science with a high degree of abstraction, its teaching ends up becoming a challenge; a fact that makes it essential to use new teaching-learning models to replace the traditional one commonly applied in schools, in order to stimulate critical thinking, the practical application of knowledge and problem solving. In the present work, the objective is to develop a proposal for a Didactic Sequence for the use of Carbon Dots applied to the study of seed germination as an intervention tool in teaching Nanoscience and Nanotechnology to a High School class, using as a basis the investigative experimentation. This proposal will facilitate the planning and organization of activities, helping the teacher to conduct classes in a logical and structured manner. Prior to the development of the Didactic Sequence, germination tests were carried out with corn and bean seeds, using solutions of carbon nanoparticles (Carbon Dots), as a figure of merit. Positive results were obtained regarding seedling development, allowing the evaluation of germination efficiency based on the number of germinated seeds and analyzing root growth based on measuring their lengths. Once the experiment was validated, the second stage of the work consisted of developing the Didactic Sequence proposal, based on the adaptation of a model already considered in the literature, however addressing the theme of Nanoscience and Nanotechnology. The proposed Didactic Sequence was divided into theoretical, practical and evaluative moments, in which content related to the curricular components of Chemistry, Biology and Mathematics would be addressed, to understand the processes and evaluate the results obtained in the germination tests. The proposed Didactic Sequence will allow the construction of a clear and orderly structure in the development of classes based on a more contextualized, dynamic and interactive approach compared to the traditional teaching model. Furthermore, it must provide more attractive teaching for students and achieve greater effectiveness in the construction and retention of knowledge.Item O cloreto de potássio afeta a germinação de sementes e o crescimento inicial de plântulas de Mimosa caesalpiniifolia Benth(2023-04-20) Lima, Raiane Larissa Silva de; Gallo, Ricardo; http://lattes.cnpq.br/5160912065817980; http://lattes.cnpq.br/7403117695827576Mimosa caesalpiniifolia Benth., popularly known as sabiá, is a tree species native to the Caatinga and belonging to the Fabaceae family. It has great economic and environmental potential, being used in the production of firewood, charcoal, and forage, as well as being recommended for the recovery of degraded areas. In soils of arid and semi-arid regions, as is the case with the species M. caesalpiniifolia, seed germination can be negatively affected by unsuitable conditions, such as saline soils. Thus, the objective of this study was to evaluate the germination and vigor of Mimosa caesalpiniifolia Benth. seeds subjected to salt stress by potassium chloride (KCl). The experiment was conducted in a completely randomized design with four replications of 32 seeds per treatment. Different osmotic potentials were tested, namely: 0.0 (control); -0.2, -0.4, -0.6, -0.8, -1.0 MPa. The variables evaluated were: germination percentage, germination speed index, shoot and root length, and shoot and root dry weight of seedlings. The species was found to be sensitive to salt stress, reducing germination and vigor significantly with increasing concentrations of KCl.Item Avaliação do potencial alelopático de extratos obtidos de materiais vegetais utilizados como cobertura morta no controle de espécies de plantas daninhas(2023) Lustosa, Klenio Raphael Alves; Montarroyos, Angélica Virgínia Valois; http://lattes.cnpq.br/6915874605219533; http://lattes.cnpq.br/1375327527708447Item Efeito do estresse salino na germinação de sementes da Moringa oleifera Lam(2023-05-12) Alves, Beatriz Silva; Lima, Elifábia Neves de; http://lattes.cnpq.br/6117763430610324; http://lattes.cnpq.br/4640617602930699La Moringa oleifera Lam. es un árbol originario de la India y se cultiva en vários países por su multifuncionalidad. Actualmente, se encuentra ampliamente en el Nordeste brasileño y su crecimiento en esta región está siendo utilizado como purificador de agua en áreas rurales. Dada su gran importancia para los agricultores familiares por sus múltiples aplicaciones de uso, como fuente de alimento, producción de jabón y biodiesel, como sustituto proteico y en su aplicación farmacológica. Este trabajo tuvo como objetivo evaluar el efecto del estrés salino em la germinación de semillas de moringa expuestas a diferentes sales y niveles de salinidad, con el fin de obtener una productividad óptima para los agricultores, ya que la región semiárida se caracteriza por altas concentraciones de sales en el suelo, debido a la escasez de lluvias y la alta tasa de evaporación. El experimento fue realizado en el Laboratorio de Ecología Vegetal de los Ecosistemas del Nordeste (LEVEN) - UFRPE, ubicado en la ciudad de Recife. El diseño experimental fue completamente al azar, con siete tratamientos y cuatro repeticiones, 100 semillas por cada tratamiento. Las sales utilizadas fueron NaCl y KCl con los siguientes niveles: 0,04 M, 0,08 M y 0,12 M. Las variables analizadas fueron el porcentaje de germinación (G%), índice de velocidad de germinación (IVG), longitud del hipocótilo y raíz y la masa seca de las plántulas. Se concluyó que la salinidad no afectó significativamente el porcentaje de germinación de Moringa oleifera Lam. para lãs concentraciones de NaCl y KCl, sin embargo, hubo una reducción en el índice de velocidad de germinación con el aumento de los niveles salinos en las condiciones establecidas en este trabajo. Se observó una reducción en la longitud del hipocótilo y raíz con el aumento de la concentración de sales, siendo la longitud de las plântulas y el número de plántulas normales las más afectadas por el NaCl. La influencia Del KCl aún no ha sido concluyente con este trabajo, siendo necesario seguir trabajando.Item Seleção de progênies via germinação de sementes de Mimosa caesalpiniifolia B. sob estresse salino(2022-05-26) Ordonho, Larissa Santiago Ritt; Gallo, Ricardo; http://lattes.cnpq.br/5160912065817980; http://lattes.cnpq.br/4822409457783849Mimosa caesalpiniifolia Benth., known as sabiá, is a native forest specie of Caatinga belonging to the Fabaceae family. Species that develop in arid and semi-arid regions, such as sabiá, usually encounter adverse conditions for germination and emergence, such as high soil salinity and water deficit. Thus, the objective of this work was to verify whether it is possible to select progenies of M. caesalpiniifolia that are tolerant to the stress caused by doses of saline solutions in the early stages of development. Seeds were collected from 16 matrices located in different states (PE, PI, CE, RN), four per state. The experiment was carried out in the forest seed analysis laboratory at the Federal Rural University of Pernambuco (UFRPE). To simulate saline stress, NaCl solutions were used, with osmotic potentials of 0.0; -0.2; -0.4; -0.6; -0.8; -1 MPa. Percentage and germination speed index, length and dry mass of shoots and roots and percentage of abnormal seedlings were evaluated. The experimental design was completely randomized with four replications of 32 seeds for each potential. After carrying out the evaluations, the maximum dose of pre-established tolerance was reapplied in four replications of 25 seeds from each provenance to identify the genetic divergence in terms of tolerance to saline stress. For the germination percentage, the values were adjusted to the quadratic regression model and for the germination speed index, the data were adjusted to the decreasing linear regression model, reducing as the osmotic concentration increased. Salinity reduced the germination and vigor of M. caesalpiniifolia seeds, decreasing the characters evaluated at the lowest osmotic potentials. The germination test with sabiá seeds proved to be effective for determining tolerance to salt levels (NaCl), the species M. caesalpiniifolia tolerates low osmotic concentrations of sodium chloride and the critical level selected was -0.4 MPa. Through the Mulamba and Mock index, it was possible to select the P1-CE, P2-PI, P3-RN, P1-PE and P1-PI progenies in early stages of development that showed tolerance to salinity levels for the production of seedlings.Item Tratamentos pré-germinativos na superação de dormência de sementes de Colubrina glandulosa Perk. (Rhamnaceae)(2019-12-03) Coelho, Nayla Pamella da Silva Cavalcanti; Silva, Emanuel Araújo; Barbosa, Marta Ribeiro; http://lattes.cnpq.br/9559350854481161; http://lattes.cnpq.br/2765651276275384; http://lattes.cnpq.br/2836457612273970Little is known about the use of plant extracts to break dormancy of forest seeds, so it is interesting to study the effect of aqueous extract of Cyperus rotundus as a treatment for overcoming seed dormancy. The aim of this study was to evaluate the efficiency of pre-germinative treatments in overcoming seed dormancy of Colubrina glandulosa Perk. The experiment was developed at the Forest Seed Laboratory of the Federal Rural University of Pernambuco. At the time, seeds of the species obtained from matrices located at the Carpina Sugar Cane Experimental Station were submitted to germination tests by applying 6 treatments with 4 replications. Each unit was characterized by 25 seeds packed in a polyethylene box containing a sheet of paper towels. The treatments were: (T1) without acid scarification + autoclaved distilled water; (T2) without acid scarification + aqueous extract of C. rotundus 5%; (T3) without acid scarification + aqueous extract of C. rotundus 10%; (T4) with acid scarification + aqueous extract of C. rotundus 5%; (T5) with acid scarification + 10% aqueous extract of C. rotundus; and (T6) with acid scarification + autoclaved distilled water. To evaluate the effects of aqueous extract of Cyperus rotundus on seed germination of C. glandulosa, we analyzed: IVG, VG and G%. The statistical design used was completely randomized and in a 2x3 factorial arrangement, considering 2 pre-germinative conditions and 3 types of wetting. Data were submitted to analysis of variance (ANOVA) and means compared by Tukey test at 5% probability. The G% and IVG results obtained showed that there was no significant interaction between the evaluated treatments and that there was a significant difference in the VG between the treatments in which the seeds were not scarified and those that received acid scarification submitted to moistening with same extract type of 10% concentrated thyroid. It was concluded that the interactions between conditioned pre-germination treatments for overcoming dormancy of C. glandulosa dispersion units were not significant.Item Efeitos alelopáticos de Tectona grandis L.F. sobre a germinação e desenvolvimento inicial da alface (Lactuca sativa L. F.)(2018) Silva, Márcia Cunegundes da; Lima, Tarcísio Viana de; Araujo, Emmanoella Costa Guaraná; http://lattes.cnpq.br/1659011614593700; http://lattes.cnpq.br/0814281560377954The objective of this work was to evaluate the allelopathic effects of aqueous extracts of Tectona grandis L.F. in various concentrations produced from leaves and flowers. The seeds of Lactuca sativa lettuce were used, with the germitest paper moistened with distilled water and the aqueous extracts in concentrations of 100%, 75%, 50%, 25% and as a control (0% distilled water). The extracts were homogeneously deposited on twentyfive seeds evenly distributed in gerbox boxes. The materials used in the experiment were previously sterilized with 70% alcohol. A completely randomized design with four replicates was used and the experiment was carried out under natural conditions of temperature and humidity, and the tests were carried out in the Laboratory of Forest Seeds (Lasf), the experiment was followed for 10 days at the same time and the variables analyzed were %G, IVG, TM and VM. The data were submitted to Analysis of Variance and compared by Tukey test with probability of 5% error. It was observed that there were no significant differences in leaf extracts and flowers with respect to %G, TM and MV, however, in IVG aqueous leaf extract significantly interfered in the highest concentrations (75% and 100%). It was possible to conclude that the species has an allelopathic potential in the IVG, while the flower extracts show that on VM the concentrations 25% and 100% differed statistically.Item Relação entre a presença de dormência e a dinâmica na Emergência de herbáceas do banco de sementes do solo da caatinga(2019) Souza, José Djalma de; Araújo, Elcida de Lima; Aguiar, Bruno Ayron de Souza; http://lattes.cnpq.br/2829559518802671; http://lattes.cnpq.br/6239993539613839; http://lattes.cnpq.br/4159123734936230