Evolução Temporal da Incorporação de 137Cs+, K+ e Na+em Plantas Frutíferas Tropicais e suas Correlações com a Fisiologia Vegetal

• Ano de defesa: 2011
• Autor(a) principal: Cid, Alberto Silva
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Programa de Pós-graduação em Física; Física
• Palavras-chave em Português: 137Cs, K, Na, Citrus limon B.,Cocos nucifera L., Espectrometria Gama, Ativação Neutrônica; CNPQ::CIENCIAS EXATAS E DA TERRA::FISICA
• Link de acesso: https://app.uff.br/riuff/handle/1/19623

Concentrations of 137Cs, K and Na in fruits of lemon (Citrus limon B.) and of K and Na in fruits of coconut (Cocos nucifera L.) were measured by both gamma spectrometry and neutron activation analysis, with the aim to understand the behaviour of monovalent inorganic cations in tropical plants as well as the plant ability to store these elements. In contrast to K and Na, Cs is not an essential element to plants. However, our results have shown that 137Cs incorporation to vegetal tissues is positively correlated to K distribution inside the tropical plant species studied, suggesting that these two elements might be assimilated in a similar way, and that they pass through the biological cycle together. Nevertheless correlation between 137Cs and Na is strongly dependent on plant species. A simple mathematical model is also proposed to describe the temporal evolution in the incorporation of monovalent inorganic cations by the fruits of such tropical species. This model exhibited close agreement with the experimental results along the fruit development.