Metil jasmonato na mitigação do déficit hídrico em rabanete (Raphanus sativus L.)

• Autor(a) principal: Araujo, Damiana Justino
• Data de Publicação: 2024
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UFPB
• Texto Completo: https://repositorio.ufpb.br/jspui/handle/123456789/32083
• topic: Biorregulador; Estresse hídrico; Raphanus sativus L.; Tolerância à seca; Bioregulator; Water stress; Drought tolerance; CNPQ::CIENCIAS AGRARIAS

Radish (Raphanus sativus L.) is a vegetable grown worldwide rich in nutrients and antioxidants. Water is a critical factor for the growth and development of this crop, so it is necessary to find strategies to improve its tolerance to drought. Methyl jasmonate is a bioregulator known to play an important role in modulating plant responses to stress. In this sense, this study aimed to investigate the role of methyl jasmonate in mitigating the effects of water deficit in radish plants. The experiment was conducted at the Seedling Production Laboratory of the Center for Human, Social and Agricultural Sciences at the Federal University of Paraíba, Bananeiras-PB. The plants were subjected to irrigation with 80% of the water retention capacity (control) and total restriction of irrigation at 15 DAS. At 7, 14 and 21 days after sowing (DAS), exogenous applications (foliar spray) of methyl jasmonate at a concentration of 100 µM and the control solution (water only) were carried out. The experimental design used was completely randomized, in a 2 × 2 factorial scheme (soil moisture levels x bioregulator concentration) with 10 replications. The following were evaluated: growth parameters, gas exchange measurements, fluorescence, photosynthetic pigments, relative water content and electrolyte extravasation. The data were subjected to analysis of variance using the F test (P ≤ 0.05). The water deficit reduced the growth and gas exchange of radish plants and increased the antioxidant capacity in tuberous roots; despite reducing electrolyte leakage, suggesting less oxidative damage, the application of methyl jasmonate was not effective in mitigating the effects on growth and gas exchange. Thus, it is concluded that water deficit reduces growth and gas exchange of radish, but improves postharvest quality, while the application of MeJa does not mitigate the effects of water deficit.