TCC - Engenharia Florestal (Sede)
URI permanente para esta coleçãohttps://arandu.ufrpe.br/handle/123456789/436
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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 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 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.