03.1 - Graduação (UAST)
URI permanente desta comunidadehttps://arandu.ufrpe.br/handle/123456789/2926
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Resultados da Pesquisa
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.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.Item Adubação potássica em clones de palma forrageira(2019) Cirino Júnior, Baltazar; Leite, Maurício Luiz de Mello Vieira; Oliveira, Alexandre Campelo de; http://lattes.cnpq.br/8164135937542569; http://lattes.cnpq.br/4204641633941814; http://lattes.cnpq.br/4245406622322251The objective of this study was to evaluate the agronomic performance of Nopalea cochenillifera clones under different levels of potassium. Cladodes of forage palm were selected and collected (in the middle third of the plant), which was three years old, in the UAST experimental area. These cladodes went through a healing period of 10 days. They were then placed in pots (larger diameter) = 24 cm (smaller diameter) = 17 and 23 cm deep), with a capacity of 7 kg of soil, presenting deep drains, covering the bottom of the vessel with gravel to facilitate drainage. The experiment was arranged in a randomized block design in a 5x2 factorial scheme, using five levels of potassium (0, 250, 500, 750 and 1000 Kg.ha-1) and two forage palm clones (Giant Sweet and Sweet Child), with four replicates. Five biometric campaigns were carried out in August, September, October, November and December / 2018 to measure the plant height, length, width and thickness of cladodium, as well as the number of cladodes in order and totals . For the comparison test of means, only the data of the last campaign were used. The clones presented a similar response to potassium fertilization, presenting non significant results for fertilization levels. When comparing the two clones, there was no significant difference for all studied variables: plant height, number of cladodes, length, width and thickness of cladodes. Potassium fertilization does not influencethe morphological, productive and potassium parameters of plant tissues during the initial growth of the genus Nopalea. The software used was R-project version 3.5.0 and SigmaPlot 10.0.