Banca de QUALIFICAÇÃO: XOCHITL MARGARITO VISTA

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : XOCHITL MARGARITO VISTA
DATE: 30/12/2020
TIME: 14:00
LOCAL: Realizada por videoconferência
TITLE:

ARBUSCULAR MYCORRHIZAL FUNGI (GLOMEROMYCOTA) ASSOCIATED WITH AQUATIC PLANTS IN OLIGOTROPHIC LENTIC ECOSYSTEMS

KEY WORDS:

Glomeromycota, Colonization, Macrophytes, Ponds, Ecology.

PAGES: 200
BIG AREA: Ciências Biológicas
AREA: Microbiologia
SUBÁREA: Biologia e Fisiologia dos Microorganismos
SPECIALTY: Micologia
SUMMARY:

Arbuscular Mycorrhizal Fungi (AMF) are widely studied in terrestrial ecosystems, due to the symbiosis formed with more than 80% of plant species, however, there is little study on AMF in aquatic macrophyte species, especially in lentic environments in Brazil. In order to test the hypothesis that tropical aquatic environments have high diversity and colonization of AMF analyzes of diversity and distribution of AMF associated
with aquatic macrophytes in four perennial ponds in Rio Grande do Norte (RN), in order to verify diversity, species composition besides the colonization of the roots of macrophytes that inhabit this peculiar ecosystem were carried out. Samples of aquatic sediment and rhizosphere of aquatic macrophytes were collected during the rainy season (July / August) 2017. The composition of species, richness, abundance and colonization of AMF in aquatic macrophytes was evaluated, as well as abiotic factors of water. A total of 11,760 glomerospores were recorded in 51 AMF species associated with 14 plant hosts where 11 were colonized by AMF. In general, Glomus and Acaulospora were predominated genera, in addition, five new records of AMF species were found for aquatic environments and also for RN. Some species, genera, families and orders were indicative of certain areas of study. The richness and abundance of AMF differed between the ponds, the Jiqui ponds was the richest (35 spp. and 5,266 spores), however it did not differ when considering the plant effect. The turbidity variable was related to the variation in the composition of AMF from three ponds (Azul, Jiqui and Jenipabu), and the SDT was correlated with the variation in the AMF composition of the Boqueirão lagoon. There was a significant difference between the ponds in the composition of AMF. Regarding the influence of continuous variables (SDT, turbidity, study ponds and plant hosts), with respect to community and abundance it differed little between ponds, there was no influence in relation to plant host, however there was influence of the SDT and turbidity variables. Nymphoides indica had a high colonization taxa (4-99%). The Cyperaceae family, despite being considered non-mycotrophic, presented mycorrhizal colonization (1-99%). Xyridaceae was registered as a new host to harbor AMF, and the families Nymphaeaceae and Characeae were not colonized, a significant difference was presented between the types of AMF structure, hyphae (% H) was the most representative. Only between spores (% E) and vesicles (% V) there was no difference in colonization. The Paris morphological structure was the only and most frequent in the study areas. A positive correlation was observed between percentage of root colonization and AMF richness and abundance in the aquatic sediment. Of the total rhizosphere samples analyzed, a large part (95) was colonized by AMF and only (25) were not mycorrhized. The high values obtained in the present study show that the aquatic environments are rich in AMF, drawing attention to be more studied.

BANKING MEMBERS:
Presidente - 1755051 - BRUNO TOMIO GOTO
Externa à Instituição - KHADIJA JOBIM
Interna - 025.390.185-56 - PATRICIA OLIVEIRA FIUZA - UFRN