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Previous issue date: 2012 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (Capes) / A fam?lia Leguminosae ? composta por cerca de 727 g?neros e 19.325 esp?cies e, ? bem representada na Serra do Espinha?o, considerada Reserva da Biosfera pela UNESCO, portadora de alto grau de endemismos e esp?cies raras, que vem sofrendo com a perda de habitats pela a??o antr?pica. Muitas esp?cies de leguminosas apresentam potencial para recupera??o de ?reas degradadas, uma vez que possuem associa??o com bact?rias fixadoras de nitrog?nio, principalmente as do g?nero Chamaecrista. Contudo, existem poucas informa??es a respeito das esp?cies desse g?nero. E, considerando a import?ncia biol?gica dos campos rupestres, a ecol?gica das leguminosas e a lacuna de conhecimento que se tem sobre as esp?cies da flora na Cadeia do Espinha?o no Planalto de Diamantina, MG, esse estudo teve como objetivo conhecer os aspectos relacionados ? fenologia e germina??o de sementes de Chamaecrista debilis (Vogel) Irwin e Barneby. As observa??es fenol?gicas foram realizadas em ?reas de campos rupestres no campus da Universidade Federal dos Vales do Jequitinhonha e Mucuri (UFVJM), Diamantina-MG. Os testes de germina??o foram conduzidos no Laborat?rio de Sementes da UFVJM. Foram marcados e monitorados 30 indiv?duos da esp?cie, onde avaliou-se quinzenalmente, de abril de 2010 a mar?o de 2011, as seguintes fenofases: caducifolia, brota??o, flora??o e dispers?o. Verificou-se que a brota??o e flora??o, estiveram associadas com a esta??o ?mida enquanto a dispers?o e a queda de folhas com a esta??o seca. Para avaliar a germina??o foi efetuado um teste de germina??o com 12 tratamentos: testemunha, escarifica??o com lixa d??gua n.80, imers?o em ?gua a 100oC por 5, 10, 15 , 30 e 60 segundos e imers?o em ?cido sulf?rico concentrado por 5, 10, 15, 30 e 60 segundos. Foram avaliadas as porcentagens de germina??o das sementes, o ?ndice de velocidade de germina??o e do teor de ?gua das sementes de Chamaecrista debilis. Utilizou-se o delineamento inteiramente casualizado com quatro repeti??es, e as m?dias foram comparadas pelo teste de Scott-Knott, a 5% de probabilidade. Os dados indicaram que a sazonalidade clim?tica da regi?o ? determinadora dos padr?es fenol?gicos em Chamaecrista debilis. Para a germina??o verificou-se que as sementes apresentaram teor de ?gua de 11,71%. Os tratamentos com ?gua a 1000C a 5, 10 e 15 segundos e ?cido sulf?rico a 15 segundos foram os mais eficientes em promover a germina??o. / Disserta??o (Mestrado) ? Programa de P?s-Gradua??o em Produ??o Vegetal, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2012. / ABSTRACT The family Leguminosae comprises about 727 genera and 19,325 species, and is well represented in the Espinha?o considered a Biosphere Reserve by UNESCO, the bearer of a high degree of endemic and rare species, which has suffered the loss of habitats by human activity. Many species of legumes have potential for recovery of degraded areas, as they have an association with nitrogen fixing bacteria, especially those of the genus Chamaecrista. However, little information exists about the species of this genus. And considering the biological importance of the stony fields, the leguminous plants and ecological knowledge gap that exists about the species of flora in the Espinha?o of the Diamantina Plateau, Minas Gerais (MG), Brazil, this study aimed to understand the aspects related to phenology and germination seeds of Chamaecrista debilis (Vogel) Irwin and Barneby. The phenological observations were carried out in areas of rocky fields on the campus of University of the Valleys of Jequitinhonha and Mucuri (UFVJM), Diamantina, MG. Germination tests were conducted at the Laboratory of Seeds of UFVJM. Were marked and monitored 30 individuals of the species, which we assessed biweekly from April 2010 to March 2011, the following phenophases: shedding, budding, flowering and seed dispersal. It was found that the budding and flowering, were associated with the wet season while the dispersion and fall of leaves in the dry season. To evaluate the germination, a germination test conducted with 12 treatments: control, scarification with sandpaper n.80, in water at 1000C for 5, 10, 15, 30 and 60 seconds and immersion in concentrated sulfuric acid for 5, 10, 15, 30 and 60 seconds. We evaluated the germination of seeds, the germination speed index and water content of seeds of Chamaecrista debilis. We used a completely randomized design with four replications and means were compared by Scott-Knott test at 5% probability. The data indicated that the climate in the region is the determinant of phenological patterns in Chamaecrista debilis. For germination was found that the seeds had a water content of 11.71%. The treatment with water at 1000C to 5, 10 and 15 seconds and 15/2 sulfuric acid were more effective in promoting germination.
| Identifer | oai:union.ndltd.org:IBICT/oai:acervo.ufvjm.edu.br/jspui:1/587 |
| Date | January 2012 |
| Creators | Ara?jo, Jos? Eduardo Vargas Lopes de |
| Contributors | Nery, Marcela Carlota, Mendon?a Filho, Carlos Victor, Antonnini, Yasmine, Nery, Marcela Carlota, Universidade Federal dos Vales do Jequitinhonha e Mucuri (UFVJM), Mendon?a Filho, Carlos Victor |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Source | reponame:Repositório Institucional da UFVJM, instname:Universidade Federal dos Vales do Jequitinhonha e Mucuri, instacron:UFVJM |
| Rights | info:eu-repo/semantics/openAccess |
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