Avaliação da composição de Fungos Micorrizícos Arbusculares (Glomeromycota) em solos halomórficos no Rio Grande do Norte
The coastal zone of Rio Grande do Norte State (RN) is the main focus of salt production in the country, significantly impacting the plant and microbial community, as well as the soil in this region. In this scenario, Arbuscular Mycorrhizal Fungi (AMF), as they form an obligatory symbiosis with pl...
Na minha lista:
Autor principal: | |
---|---|
Outros Autores: | |
Formato: | doctoralThesis |
Idioma: | pt_BR |
Publicado em: |
Universidade Federal do Rio Grande do Norte
|
Assuntos: | |
Endereço do item: | https://repositorio.ufrn.br/handle/123456789/49189 |
Tags: |
Adicionar Tag
Sem tags, seja o primeiro a adicionar uma tag!
|
Resumo: | The coastal zone of Rio Grande do Norte State (RN) is the main focus of salt
production in the country, significantly impacting the plant and microbial community,
as well as the soil in this region. In this scenario, Arbuscular Mycorrhizal Fungi (AMF),
as they form an obligatory symbiosis with plant roots, play an important role in this
plant-soil system, increasing the tolerance of plant symbionts to stressful
environments, such as saline ones. Thus, this thesis aimed to identify the diversity of
the AMF community in a saline activity zone on the north coast of RN, seeking to
understand the influence of salinity on this diversity. For this, four collections were
carried out, during two consecutive periods of dry and rainy season, between
NOV/2017 to JUN/2019 in three locations with different levels of salinity (saline in
Macau [active saline], Reserva de Desenvolvimento Sustentável Estadual Ponta do
Tubarão [negative control] and Galinhos [natural saline]) followed by physicochemical
and taxonomic analyses. Thirty-seven species were identified, distributed in 19 AMF
genera (Acaulospora, Ambispora, Dentiscutata, Cetraspora, Corymbiglomus,
Claroideoglomus, Entrophospora, Fuscutata, Gigaspora, Glomus, Intraornatospora,
Oehlia, Paradentiscutata, Paraglomus, Rhizoglomus, Racocetra, Sclerocystis,
Scutellospora and Septoglomus), being the active saline environment the richest and
most abundant in AMF species, when compared to the other two collection sites, with
lower average salinity. Regarding the seasonal dry and rainy seasons, in general the
dry season was richer in number of species and had greater abundance of spores.
According to the UPGMA analysis, what most correlated the samples from the same
area was the plant composition. However, the influence of salinity cannot be ruled out,
since samples with higher salinity indices had lower species richness than samples
with lower indices within the same collection area (Macau active salt). Therefore, more
samples would be needed to statistically validate this observation. In addition to these
results, a new species of the genus Acaulospora, which was the most abundant in the
samples, was described, containing a double ornamentation with pit-shaped
depressions, with spine-shaped projections inside, in a flat view the pits are connected
as structures that look like channels. Along with the description of the new species, a
review of the genus Acaulospora was carried out with phylogenetic analyzes using
nrDNA sequences, which showed that Acaulospora is a monophyletic genus that also
includes the species Kuklospora colombiana and K. kentinensis. Furthermore, we can
conclude that the ornamentations described for the species of Acaulospora, despite
being useful for the morphological description of species, constitute homoplastic
characters due to the convergence of these characteristics in groups of species that do not share a more recent single ancestor. Spores of the species Corymbiglomus
globiferum, also collected in the areas of this study, were used and deposited in the
UFRN herbarium, analyzed and included in the article “Sieverdingia gen. nov., S.
tortuosa comb. nov., and Diversispora peloponnesiaca sp. nov. in the Diversisporaceae (Glomeromycota)”. |
---|