Bacharelado em Ciências Biológicas (UAST)
URI permanente desta comunidadehttps://arandu.ufrpe.br/handle/123456789/2931
Siglas das Coleções:
APP - Artigo Publicado em Periódico
TAE - Trabalho Apresentado em Evento
TCC - Trabalho de Conclusão de Curso
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Resultados da Pesquisa
Item Favaliação da atividade alelopática do extrato aquoso de Senna siamea (Lam.) H.S. Irwin & Barneby sobre o desenvolvimento de plântulas de Lactuca sativa l.(2019) Medeiros, Luanna Torres de; Saraiva, Rogério de Aquino; http://lattes.cnpq.br/6812072552819682; http://lattes.cnpq.br/8680775638977616Allelopathy is understood as a process that occurs in plant communities, where species act through mechanisms capable of interfering with the growth and development of other plants, through the release of chemicals, also called allelochemicals, which are derived from processes that cause they occur naturally in their secondary metabolism and subsequently deposited on the substrate. These allelochemicals may perform harmful or advantageous actions when in contact with other plants present in the same environment, depending on the amount and circumstances in which they are in place. Senna siamea (Lam) H.S. Irwin & Barneby, popularly known as canafistula or cassia-siam is originally from Thailand, but widely found in the Brazilian semiarid region, which has abundant application in landscape use, shading and various ethnopharmacological research. Considering the large dispersal of S. siamea species throughout the Brazilian Northeast, we aimed to evaluate its allelopathic activity on the development of Lactuca sativa (lettuce) seedlings. For this, 25 L. sativa seeds were placed in Petri dishes, and at the same time different concentrations (0, 25, 50, 75 and 100) of the aqueous extract of Senna siamea leaves were added, followed by The seeded plates wererelocated to a germination chamber where they remained for seven days under daily monitoring. The analyzes were performed through measurements of seedling root and hypocotyls and phytotoxicity bioassays and phytochemical tests, from which the presence of secondary metabolites classes such as flavonoids and phenolic compounds were detected. From this, an inhibitory effect was observed in relation to lettuce seedlings, which was observed by observing the root and hypocotyl length, decrease of vigor, presence of necrosis and reduction of chlorophyll and carotenoid content. Based on the knowledge obtained, it is possible to evidence that this plant species has relevant potential as a source of chemical compounds with significant biotechnological properties in the production of natural herbicides for less aggressive use against the weeds, besides the search for more information for proper use of plant species that have allelopathic potential.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 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.