Fungos micorrízicos arbusculares (Glomeromycota) em um contínuo de restinga e caatinga, na reserva de desenvolvimento sustentável Estadual Ponta do Tubarão-RN
The coastal zone is characterized by a transition between biomes or phytophysiognomies and may present stressful environmental conditions. In Rio Grande do Norte State (Brazil), this transition occurs due to the overlap (ecotone) between restinga and caatinga, distinct phytophysiognomies, charact...
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| Formato: | Dissertação |
| Idioma: | por |
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Brasil
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/23609 |
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| Resumo: | The coastal zone is characterized by a transition between biomes or
phytophysiognomies and may present stressful environmental conditions. In Rio
Grande do Norte State (Brazil), this transition occurs due to the overlap (ecotone)
between restinga and caatinga, distinct phytophysiognomies, characterized by
mosaic formations. In addition to the flora adaptations to this interface, another
important factor for the survival of plant species is the arbuscular mycorrhizal fungi
(AMF), which are important symbionts that are relevant for the stabilization of the
soil-plant system. In view of its ecological importance, this work aimed to identify the
diversity of the AMF community in a restinga and caatinga continuum along the
Northeastern coast, in the Ponta do Tubarão Sustainable Development Reserve, in
Macau / Guamaré Counties, RN, Brazil. Two soil collection were carried out, one at
the end of the period after rainfall and another in the dry period for AMF species
identification by spore morphology. The soil abiotic factors and their influence on the
AMF community were assessed. Twenty - four species were identified, 12 of which
are exclusive to restinga, one (1) to caatinga and 11 occurred in both areas. As for
the seasonal dynamics, the dry period showed a greater abundance of spores, and in
the rainy season sporocarpic species, with agglomerates forming bunches of spores,
were frequently found. The environmental factors that most influenced the distribution
of the species were salinity and pH. The salinity, as well as the other chemical
aspects of the soil verified, was homogeneous, being found some specific sites more
saline, which presented a low species richness. This result suggests a significant
impact of one of the main economic activities of the RN, the salines, on the
biodiversity of AMF in the soil. |
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