Mestrado em Biologia Vegetal

URI Permanente para esta coleção

http://repositorio.ufes.br/handle/10/17506

Nível: Mestrado Acadêmico
Ano de início: 2002
Conceito atual na CAPES: 4
Ato normativo: Homologado pelo CNE (Portaria MEC Nº 609, de 14/03/2019. Publicação no DOU 18 de março de 2019, seç. 1, p.52 - Parecer CNE/CES no 487/2018, Processo no 23001.000335/2018-51).
Periodicidade de seleção: Anual
Área(s) de concentração: Filosofia
Url do curso: https://biologiavegetal.ufes.br/pt-br/pos-graduacao/PPGBV/detalhes-do-curso?id=28

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Navegando Mestrado em Biologia Vegetal por Assunto "Ácido húmico"

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    Ácidos húmicos extraídos do lodo de esgoto sanitário e seus efeitos em plantas
    (Universidade Federal do Espírito Santo, 2014-02-27) Rocha, Lívia Dorsch; Dobbss, Leonardo Barros; Matsumoto, Silvia Tamie; Cuzzuol, Geraldo Rogério Faustini; Mazzeo, Dânia Elisa Christofoletti
    The final disposal of sewage sludge has been presented as an environmental and public health problem. The sewage sludge is rich in organic matter but it also presents pollutants and pathogens. Thus, this work was extracted humic acid (HA) which is a compound resulting from the fractionation of humic substances that comprises a carbon group generated by the decomposition of organic waste that suffer resynthesis forming humus. Humic acid promotes many benefits in plants, such as growth cell elongation, stress tolerance, increased plasma membrane permeability. Based on these features, the present study aimed to evaluate the cytogenetic effects (Allium cepa test), physiological and biochemical in Oryza sativa culture treated with differents concentrations of humic acids derived from sewage sludge. Elemental characterization of HA was performed to define the doses (0,5; 1, 2 e 4 mM C L-1). After 20 days of treatment, samples of the material were taken and subsequently analyzed. The chemical characterization of HA indicated it as a good conditioner for cultures showing high rates of Carbon, Hydrogen and Nitrogen. No effect of toxicity, cytotoxicity, genotoxicity and mutagenicity of HA was observed. The results have shown significant increase of plant photosynthetic pigments on higher concentrations (2 mM C L-1 and 4 mM C L-1). In general the higher concentrations have presented more growth. Futhermore, there was an increase of ATPase expression in all treatments. And enzymes of oxidative stress increased relatively in differents concentrations. By the integration of these analyzes it was possible conclude that the humic acid from sewage sludge can be used as organic fertilizer as observed by the plant benefits showed in this work. Moreover, HA offers a good alternative for the disposal of sewage sludge residue, recycling the organic matter.
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    Efeitos dos ácidos húmicos provenientes de aterro sanitário em plantas
    (Universidade Federal do Espírito Santo, 2014-02-13) Morozesk, Mariana; Dobbss, Leonardo Barros; Matsumoto, Silvia Tamie; Morales, Maria Aparecida Marin; Cavatte, Paulo Cezar
    The process of biological treatment of landfills leachate results in the generation of large amounts of sludge, characterized by containing high levels of organic matter. The chemical fractionation of organic matter results in humic acids (HA) that has been demonstrated with high efficiency on the plant growth promoting improvements on development. This work aimed to evaluate the effects of exposure of plants to different doses of HA extracted from sludge landfill by chemical and biological analysis, to elucidate the effects of this organic material and minimize the potential risks of using sludge in natura. Chemical characterization of HA showed high carbon and nitrogen levels, which can consist in an important source of nutrients for plants. Furthermore, effects were observed in the absorption rates and in factors of bioconcentration and translocation of some nutrients. Regarding the analysis of antioxidant, enzymes were possible to observe different effects of HA with the each dose applied. Furthermore, cytogenetic abnormalities were detected in meristematic cells and F1. Actions on plant growth are also reported through significant increases in root area and height. In general, growth data showed an investment in the plant shoot, probably associated with the improved efficiency of the root system. Moreover, alterations on thickness of the epidermis were also reported. In this context, despite the evidenced nutritional benefits and the activity of HA on plant metabolism, their biological effects on oxidative stress enzymes and its cytotoxic capacity need to be clarified. Due to the complexity of the compound, the use of chemical, genetic, enzymatic, physiological and anatomical analyzes was an important tool in evaluating the application of humic acids in plants.