01.1 - Graduação (Sede)
URI permanente desta comunidadehttps://arandu.ufrpe.br/handle/123456789/2
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Resultados da Pesquisa
Item Crescimento e qualidade de mudas de Piptadenia stipulacea (Benth.) Ducke, em diferentes recipientes e doses de fertilizante misto(2024-09-12) Souza, Thallyta Valentin dos Santos de; Freitas, Eliane Cristina Sampaio de; http://lattes.cnpq.br/7525975084334972; http://lattes.cnpq.br/1375547405957419In 2022, Brazil suffered a neduction of 2.05 million hectares of native forest, the Caatinga biome, in tum, lost the equivalent of 140.637 hectares. This highlights the urgency of actions to curb environmental degradation and promote conservation. It is vital to invest in research on native forest species to fill technological gaps, meet the demand for seedlings and drive sustainable development. Piptadenia stipulacea (Benth.) Ducke, a species native to Brazil, is a recommended option for recoverins degraded areas in the Caatinga. Therefore, the objective o£ this work is to evaluate the influence of the volumetric capacity of containers for the production of seedlings such as tubes and polyethylene bags, combined with different doses of NPK, on the growth and quality of seedlings of Piptadenia stipulacea (Benth.) Ducke. The study was carried out in the forest nursery of the Forestry Science Department of the Federal Rural University of Pernambuco (UFRPE), from November 2022 to March 2023. Three containers were tested for the production of seedlings: a 120 cm3 tube, a 280 cm3 and plastic bag of 3449 cm3 (20 cm x 30 cm) and four doses of NPK (4-14-8): 0; 2.0; 4.0; 6.0 Kg/m3. The analyzes of height and diameter of the stem were monitored monthly and a destructive analysis was performed at the end of the 120 days. The results indicated that the reduction in container volume caused a decrease in dry mass, diameter and height. Increasing NPK doses had a significant effect on recipient height and stem diameter. For the robustness index, the dose of 2 kg/m3 obtained the best performance. In view of the results, the use of polyethylene bags with the addition of 2 kg/m3 of NPK is recommended for the production of jurema branca seedlings.Item Fertilização potássica no crescimento de mudas de Eucalyptus camaldulensis Dehnh. sob limitação hídrica(2024-03-04) Luna, Andressa Cristina de; Freitas, Eliane Cristina Sampaio de; http://lattes.cnpq.br/7525975084334972; http://lattes.cnpq.br/8800788371861007The objective of this study was to evaluate the effect of potassium fertilization on the growth of Eucalyptus camaldulensis Dehnh seedlings under water limitation. The sowing was done with improved seeds of E. camaldulensis Dehnh in 80 tubes of 55 cm³ each. The seedlings were grown in full sunlight, and topdressing fertilization with macro and micronutrients, along with different doses of potassium (K), using potassium chloride (KCl) as a source, was applied. After the potassium fertilization was completed, measurements of height (H) and collar diameter (CD) were taken to standardize the seedlings according to each treatment (K dose), and they were transplanted into 5 dm³ capacity pots filled with a substrate composed of 70 % subsurface soil and 30 % commercial substrate. The treatments consisted of a factorial of two irrigation regimes (with and without suspension) by five levels of topdressing fertilization with K (0, 75, 150, 225, and 300 mg dm - ³), arranged in a completely randomized design with 4 repetitions, each pot composing a sample unit. After 15 days of transplantation, irrigation was suspended in half of the pots for 21 days, and the number of leaves (NL) was counted, along with recording visual symptoms of water stress during this period. At the end of the experiment, new measurements of height (H), collar diameter (CD), shoot dry matter (NL) were taken, growth increments were calculated, and stomatal density, chlorophyll index, relative water content, and dry matter were determined. Using the data of height (H), collar diameter (CD), shoot dry matter (SDM), root (RDM), and total (TDM), seedling quality ratios were calculated: SDM/RDM, H/CD, and Dickson Quality Index (DQI). The data were analyzed using analysis of variance (p<0.05), and those indicating significant interaction were subjected to regression analysis within the qualitative factor. Analyzing the statistical data, it was observed that potassium fertilization positively influenced the initial growth of the seedlings in all treatments, with the estimated optimum dose being 286 Kg dm -3 of K. The result of the variables with the factors of K doses and irrigation of Eucalyptus camaldulensis Dehnh seedlings showed a significant difference of 5% only for irrigation.Item Mecanismo floral e reprodução em Centrosema virginianum (L.) Benth(2019) Camurça, Letícia Menezes; Leite, Ana Virgínia de Lima; http://lattes.cnpq.br/0648909336920690; http://lattes.cnpq.br/8840913329269415The papilionaceous flowers are described in the literature as being flowers with secondary presentation of the brush type, where a series of trichomes on the stylet are responsible for the collection and deposition of pollen in the body of the pollinator for reproduction. The objective of the present study was to analyze the floral mechanism, ultraviolet reflection, pollen morphology, floral anthesis, frequency of visitors and breeding system of Centrosema virginianum, a papilionaceous species with flowers that has a purple and, less commonly, white coloration. For analysis of the floral mechanism, videos were recorded with simulations of visits to visualize the exposure of the floral structures and the pollen deposition, as well as to analyze the role of the brush in this mechanism of deposition. Tests of ultraviolet reflection with ammonium hydroxide were carried in purple and white flowers and analysis of pollen morphology through the acetolysis method. Floral buttons of purple and white flowers were collected for the accomplishment of the acetolysis and preparation of slides for analysis of the pollen morphology. For the floral anthesis, pre-anthesis buttons of purple and white flowers were observed until the beginning of the anthesis to record the time. 40 hours of observations were made to determine floral visitors and classify them as pollinators and plovers. For the breeding system, tests of cross-pollination and manual and spontaneous self-pollination, besides the control group (natural pollination) were performed. The brush mechanism consists of trichomes present from the tip of the stylet and has the function of sweeping the pollen from their anthers to the dorsal region of the insect and bringing the pollen from other flowers to be fertilized. The ultraviolet reflection tests showed that there are differences in the coloration of purple and white flowers, but there are no differences between the nectar guides of both, since they remain the same. The pollen grains of purple and white flowers differed only in size. The floral anthesis begins before 5:00 a.m. and lasts approximately thirteen hours. The main pollinators of C. virginianum are bees of the genus Bombus and Xylocopa, although bees of the genus Euglossa may be occasional pollinators, depending on the size of the flower. The flowers also receive visits of Lepidoptera of the family Hesperiidae, that are plunderers. None of the flower visitors distinguished between purple and white flowers. The species is self-compatible autogamous and, due to the low amount of fruits formed by spontaneous self-pollination, requires a vector to perform self-fertilization. Centrosema virginianum is a climber, herbaceous, autogamous species, but dependent of pollinators, although the flowers presents in purple and white colors, did not show reproductive and ecological differences between them.Item O que faz a polinização ser “o menor dos mundos”? Uma análise a partir de estudos de caso(2018) Araújo, Karoline Couto; Bezerra, Elisangela Lucia de Santana; http://lattes.cnpq.br/4360870964749577; http://lattes.cnpq.br/7885361436753765Plant-pollinator interaction networks express a typical structure, marked by strong connectivity, degree of dependence and its size. Modularity may also be characterized in this system, especially when it comes to specialized syndromes, involving partners with certain more specific specificities and abilities. Particularly noteworthy are poricidal flowers and vibrating bees, oil flowers and bees collecting floral oils, resin flowers and Euglossini, tubular flowers and their related pollinators, ranging from long-tailed bees or specific hummingbirds to bats and sphingids.In this way, we aim to present a brief analysis to try to portray the biological system that involves the pollinator network in a fragmented Atlantic Forest scenario. Data collection was done through a bibliographic survey based on case studies developed in the PEDI. The works were collected in the database Pergamum and Google Scholar, using theses, dissertations and scientific articles. The keywords used in the search were pollination, reproductive biology and floral biology (pollination, reproductive biology and floral biology).The following information was extracted from the works for the construction of the network: I – name of plant species, II- name of the pollinators identified in the interactions. Then, the binary matrix was applied to Program R for the creation of the network of interaction in graph form. The size of the net found in the PEDI was equal to 60 (49 species of pollinators, being bees, flies and hummingbird and 11 species of plants). The bipartite graph presented heterogeneous connectivity, most interactions were simple, where many species interacted with few partners. From the perspective of pollinators, only Phaethornis ruber made generalist interactions (4). Among the plants, the Byrsonima sericea species presented the most connections (17). The present work concluded that the interaction network presented characteristics that confirm the expected patterns for pollination networks, especially for specialized syndromes.