Fungos micorrízicos arbusculares em áreas costeiras no Estado do Rio Grande do Norte, Brasil

• Ano de defesa: 2018
• Autor(a) principal: Lima, Ruy Anderson Araújo de
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Brasil; UFRN; PROGRAMA DE PÓS-GRADUAÇÃO EM SISTEMÁTICA E EVOLUÇÃO
• Palavras-chave em Português: Glomeromycota; Micorrizas; Restinga; Sazonalidade; Metodologia; CNPQ::CIENCIAS BIOLOGICAS: SISTEMÁTICA E EVOLUÇÃO
• Link de acesso: https://repositorio.ufrn.br/jspui/handle/123456789/25635

Two studies about environmental factors influencing on arbuscular mycorrhizal fungi (AMF) distribuition were conducted in two coastal areas of Rio Grande do Norte state between 2013 and 2015. Biological material collections occurred during rainy and dry periods. The first study was carried out in an Atlantic Forest area, in two distinct phytophysiognomies, where it was evaluated whether the local AMF community responded to soil component’s variation under the hypothesis that nutritional deficiency could favor AMF diversity and is directly associated with the distribution pattern of these organisms. Divergent than expected, the AMF of the locality was not significantly influenced by the observed edaphic variables, showing signs of its distribution being positively related to the plant diversity of the locality where they are inserted. In this study was found the first record of Septoglomus furcatum for Atlantic Forest areas. The second study was carried out in a coastal dune region with a Caatinga vegetation, in which the distribution of AMF was observed in floodable and non-floodable areas due to hypersaline fluvial influence. In this study, it was observed that the fluvial waters act as an environmental filter influencing the AMF species distribution. For species registered in the second study, three represent new records for science (Scutellospora sp. and Rhizoglomus sp.), one species is considered rare (Acaulospora spinosissima) and two have old original description (Glomus nanolumem and Rhizoglomus microaggregatum). In the studie’s course, some spores were described as "sp" due to the low amount of glomerospores obtained by wet sieving and centrifugation in water and sucrose, leading to the search for an improvement of these methods or proposing of AMF soil extraction processes, suggesting the methodology here called "wet shaking", which proved be more efficient in relation to aforementioned methodologies.