Detalhes bibliográficos
| Ano de defesa: |
2014 |
| Autor(a) principal: |
Carvalho Filho, Felipe João
 |
| Orientador(a): |
Graciano-Ribeiro, Dalva
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| Banca de defesa: |
Graciano-Ribeiro, Dalva,
Alonso, Alexandre Antônio,
Castro, Evaristo Mauro de |
| Tipo de documento: |
Dissertação
|
| Tipo de acesso: |
Acesso aberto |
| Idioma: |
por |
| Instituição de defesa: |
Universidade Federal de Goiás
|
| Programa de Pós-Graduação: |
Programa de Pós-graduação em Biodiversidade Vegetal (ICB)
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| Departamento: |
Instituto de Ciências Biológicas - ICB (RG)
|
| País: |
Brasil
|
| Palavras-chave em Português: |
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| Palavras-chave em Inglês: |
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| Área do conhecimento CNPq: |
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| Link de acesso: |
http://repositorio.bc.ufg.br/tede/handle/tede/4274
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Resumo: |
The vetiver grass (Chrysopogon zizanioides (L.) Roberty) is a plant of Asian origin used for production of perfumes (from an oil extracted from its roots), erosion control, restoration of degraded areas, crafts, phytoremediation, feeding animals and sewage treatment in areas where lack basic sanitation. This study evaluated the morphology and anatomy of the root of C. zizanioides submitted to the waste, in order to confirm the hypothesis that changes in their development due to different oxygen concentrations. The experiment was conducted at the Sewage Treatment Plant (STP) Samambaia, located on campus II of the Universidade Federal de Goiás (UFG). The station is divided into Pond 1 (facultative - 186 m length) and Pond 2 (maturation - 112,90 m in length), in which seven floats were distributed every 40 meters, a float remained in a box with potable water (control); each float three individuals were planted. Seven collections were taken during the six-month period every 28 days. The following measurements were taken: total length and outer diameter; the total cross sectional diameter (area), thickness of the epidermis, cortical thickness (total), thickness aerenchyma/parenchymal, thickness of endoderm, cylinder vascular diameter, diameter of the elements (metaxylem) and number of elements (metaxylem) in both proximal and distal regions. To characterize the anatomical crosssections in the proximal and distal roots were performed. The roots have a uniseriate epidermis; cortex sclerenchymatous ring, fundamental parenchyma, aerenchyma and endoderm; central cylinder unistratified pericycle, xylem and phloem and medullary region composed of parenchyma cells. There were differences in the development of aerenchyma, besides the increase in thickening of the cell walls of the cells sclerenchymatous ring, and endoderm vessel element; as well as the number of layers of the cortex and the number of vessel elements. The statistical analysis showed that there are significant differences in eight of the ten variables. In Pond 1 (facultative) there is a high concentration of organic matter and low rate of dissolved oxygen, which directly affected the development of the roots, and from the 4th collection, the ancient roots senescence and new were formed, however, did not develop the proximal region due to unfavorable conditions. In pond 2 (maturity) there is a low concentration of organic matter and higher rate of dissolved oxygen, which allowed the development of both the distal region and the proximal, however, have not reached the development presented by the roots of control. The roots were affected development in their morphology and anatomy, however, does not have structural modifications. Vetiver grass can contribute in wastewater treatment process if individuals are placed at least 160 meters from the release of raw wastewater, distance at which the concentration of dissolved oxygen shall not interfere in the formation and development of roots. |
