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Previous issue date: 2008 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (Capes) / A sempre-viva Syngonanthus elegans, ? uma esp?cies end?mica dos Campos Rupestres que est? amea?ada de extin??o devido ao extrativismo, que busca sua beleza natural como mat?ria prima para confec??o de produtos ornamentais com alto valor comercial. Existem poucas informa??es sobre a ecologia desta esp?cie e nenhuma sobre a ocorr?ncia de fungos micorr?zicos arbusculares (FMAs). O objetivo deste trabalho foi avaliar a ocorr?ncia e a diversidade de FMAs em Syngonanthus elegans. Dez plantas com ra?zes e solo rizosf?rico foram coletadas, em julho de 2007, de locais de ocorr?ncia natural em Diamantina ? MG: Nascente do C?rrego do Soberbo e Parque Nacional das Sempre-vivas. Em cada local foi selecionada uma ?rea de 100 x 100m. Estas ?reas apresentam semelhan?a quanto ? fertilidade do solo e ao clima. Como controle, foram coletadas tr?s exemplares das esp?cies Loudetiopsis chrysothrix e Xyris sp. Em S. elegans foram observados estruturas f?ngicas como hifas, ves?culas arbusculos e esporos; alta porcentagem de ra?zes colonizadas (75 %) e 24 esp?cies de FMAs morfologicamente distintos. Mais da metade dos FMAs observados neste estudo n?o puderam ser identificadas a n?vel de esp?cie, sendo que algumas destas s?o possivelmente novas para ci?ncia, como Acaulospora sp.3, Scutellospora sp.1, Scutellospora sp.3 e Scutellospora sp. 4. As fam?lias de FMAs que ocorreram em S. elegans foram Gigasporaceae, Acaulosporaceae, Glomeraceae e Archaeosporaceae, sendo que as fam?lias Acaulosporaceae (47 %) e Gigasporaceae (35 %) foram predominantes nas duas ?reas. Foram observados cinco g?neros de FMAs em S. elegans ocorrendo nas ?reas estudadas, Scutellospora, Gigaspora, Acaulospora, Glomus e Archaeospora, sendo que o g?nero predominante no Soberbo foi Acaulospora (47 %) e Glomus (26 %) e no Parque Acaulospora (35 %), Glomus (29 %) e Scutellospora (24 %). No Parque, apesar de menor ?ndice de diversidade e equitabilidade, observou-se maior riqueza de esp?cies de FMAs. Essa maior riqueza de FMAs, aliada a melhor distribui??o de esp?cies por g?nero, indica que esta ?rea apresenta uma comunidade de FMAs mais est?vel. S. elegans ? uma planta micorr?zica e apresenta alta porcentagem de ra?zes colonizadas e diversidade de FMAs. Algumas esp?cies observadas podem ser novas para a ci?ncia. Novos estudos dever?o avaliar a import?ncia dos FMAs no estabelecimento e sobreviv?ncia de S. elegans. / Disserta??o (Mestrado) ? Programa de P?s-Gradua??o em Produ??o Vegetal, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2008. / ABSTRACT The star-flower Syngonanthus elegans is a species endemic of Campos Rupestres that is threatened with extinction due to the extractivism, which seeks its natural beauty as the raw material for manufacturing of ornamental products with high commercial value. There is little information on the ecology of this species and none on the occurrence of arbuscular mycorrhizal fungi (AMF). The objective of this study was to evaluate the occurrence and diversity of AMF in S. elegans. Ten plants with roots and rhizospheric soil were collected in July 2007 of places of natural occurrence in Diamantina - MG: the east C?rrego Soberbo and the Parque Nacional das Sempre-viva. At each location was selected an area of 100 x 100m. These areas have similar about the fertility of the soil and climate. As a control, were also collected three copies of the species Loudetiopsis chrysothrix and Xyris sp. In S. elegans fungal structures were seen as hyphae, vesicles, arbusculos and spores; high percentage of roots colonized (75%) and 24 species of AMF morphologically distinct. Over half of the AMF observed in this study could not be identified in terms of species, and that some of these are probably new to science, as Acaulospora sp.3, Scutellospora sp.1, Scutellospora sp.3 and Scutellospora sp. 4. The families of AMF that occurred in S. elegans were Gigasporaceae, Acaulosporaceae, Glomeraceae and Archaeosporaceae, and the families Acaulosporaceae (47%) and Gigasporaceae (35%) were predominant in the two areas. Five genera were observed of AMF in S. elegans occurring in the areas studied, Scutellospora, Gigaspora, Acaulospora, Glomus and Archaeospora, the predominant gender in Soberbo was Acaulospora (47%) and Glomus (26%) and the Park Acaulospora (35%), Glomus (29%) and Scutellospora (24%). In the Park, despite a lower index of diversity and evenness, there was greater wealth of species of AMF. This greater wealth of AMF, combined with better distribution of species by genera, indicates that this area has a community of AMF more stable. S. elegans is a mycorrhizal plant and it presents high percentage of colonized roots and diversity of AMF. Some observed species can be new for the science. New studies should evaluate the importance of AMF in the establishment and survival of S. elegans.
| Identifer | oai:union.ndltd.org:IBICT/oai:acervo.ufvjm.edu.br/jspui:1/544 |
| Date | 30 July 2008 |
| Creators | Costa, Hesmael Antonio Orlandi |
| Contributors | Grazziotti, Paulo Henrique, Gomes, Eliane aparecida, Silva, Enilson de Barros, Nunes, Ubirajara Russi, Grazziotti, Paulo Henrique, Universidade Federal dos Vales do Jequitinhonha e Mucuri (UFVJM) |
| 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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