Plant responses to soil anoxia and hypoxia

• Ano de defesa: 2017
• Autor(a) principal: Medina, Eduardo Ferreira
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: eng
• Instituição de defesa: Universidade Federal de Viçosa; Solos e Nutrição de Plantas
• Palavras-chave em Português: Eucalipto; Plantas e solo; Plantas - Metabolismo; Ciência do Solo
• Link de acesso: https://locus.ufv.br//handle/123456789/29357

The effects of soil hypoxia/anoxia in plants have been demonstrated in this work in different clones of Eucalyptus and in chickpea. In Brazil, the eucalyptus plantations have an important economic value to produce pulp, paper and charcoal. The problem is that in the last decades some physiological disturbances have been seen in eucalyptus plantations, and these problems are related to rainy periods and soil features, like poor drainage. Nevertheless, eucalyptus clones got differential tolerance to this disturb and this study has shown that there are metabolic and physiological differences between them. The concentration of aminoacids (specially alanine and GABA) have increased when plants are in hypoxic stress. However, changes in metabolites levels in different parts of the plant have shown differential behavior between clones. In another hand, the chickpea is an important legume used as source of protein in several parts of world, in special in Africa and Asia. In several areas, the chickpea plantations face strong rainy periods, leading to soil hypoxia and anoxia. The chickpea seed is full of starch reserves and it isn’t clear if the root tips die during the hypoxic/anoxic stresses due to carbon starvation. In the experiment, we have seen less root tip mortality and better seedling root growth when the nutrient solution is supplied with glucose (50 mM) in comparison to the controls with no sugar. Even plants in anoxic system for 72 h had better root growth when the sugar was added than those which did not receive glucose in nutrient solution.