01.1 - Graduação (Sede)
URI permanente desta comunidadehttps://arandu.ufrpe.br/handle/123456789/2
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Resultados da Pesquisa
Item Influência da adição de NPK no crescimento, respostas bioquímicas e estresse oxidativo em Pavonia humifusa A. St.-Hil. (Malvaceae) sob estresse hídrico(2024-09-27) Nóbrega, Marina Morais; Sperandio, Marcus Vinícius Loss; http://lattes.cnpq.br/4157291425794314; http://lattes.cnpq.br/6953276255530257Water stress can trigger a series of plant metabolic changes, affecting their biochemistry and morphology. The variability of rainfall cycles creates challenges to adaptation. However, nitrogen supplementation (NPK) can play a crucial role in this context, as these nutrients are fundamental for maintaining metabolism, especially under stress conditions. The present study evaluated the effects of nutritional supplementation on the biochemical and morphological responses of Pavonia humifusa plants under water stress. After 21 days of supplementation, water stress was induced for 29 days. The experiment included two NPK treatments: with and without NPK associated with two conditions of water availability: control and stress. Biometric parameters (aerial and root dry biomass), physiological parameters (relative water content and SPAD index), primary metabolism parameters (pigment and proline content), stress markers (malondialdehyde and hydrogen peroxide) and enzyme activities (superoxide dismutase, catalase and ascorbate peroxidase) were analyzed. ANOVA analyzed the data at 5% and the means were compared by the SNK test using the R software. The analyses carried out indicate that after nutritional application with NPK, P. humifusa showed a better growth rate, as well as a higher total chlorophyll content in vivo. The plants supplemented with NPK also showed better adaptation to water stress with a reduction in oxidative stress. In addition, with NPK supplementation, P. humifusa responded to be less susceptible to water stress by increasing the enzymatic activity of SOD and Proline, the main osmoregulatory amino acid in water stress conditions. The results obtained suggest that nutritional supplementation with NPK plays an important role in biochemical and physiological regulation against water stress in P. humifusa.Item Influência da sazonalidade sob o acúmulo de osmorreguladores em Pavonia varians Moric, espécie endêmica da Caatinga(2022-10-06) Barros, Yasmim Lopes de; Nunes, Larisse Bianca Soares Pereira; Silva, Cláudia Ulisses de Carvalho; http://lattes.cnpq.br/7161911278790052; http://lattes.cnpq.br/5742230717504216; http://lattes.cnpq.br/8411583457051354The Caatinga is a Seasonally Dry Tropical Forest in Brazil, considered one of the most diverse semi-arid regions in the world, with a high number of endemic species and a high living population that is dependent on forest resources. Despite its importance, this region has been suffering major environmental impacts caused by human actions due to the exacerbated use of its resources. This makes it a vulnerable forest to the effects of climate change, resulting in even longer periods of drought and an increase in temperature that can result in reduced biodiversity and species abundance. In this scenario, plants make use of several mechanisms to avoid desiccation and one of them concerns the accumulation of osmoregulators. Through this knowledge, this work aims to evaluate the performance of osmoregulators in Pavonia varians, an endemic species of the Caatinga, during the dry and rainy season. For this, leaves of P. varians were collected in the field to determine the concentrations of photosynthetic pigments, carbohydrates, sucrose, proteins and proline in relation to the rainy and dry seasons. The data obtained were analyzed via ANOVA and the means compared by the Tukey test 5%. Our results show that the quantification of pigment, carbohydrate, protein and proline contents in the leaves did not vary between the dry and rainy seasons. In addition, we evidenced an accumulation of sucrose in the leaves during the dry period, suggesting its importance as an osmotic adjuster so that the species can remain with leaves during the dry period. Finally, the preference of P. varians for the greater accumulation of sucrose in the leaves as a function of the dry period can be considered an innate behavior of the species.