Banca de QUALIFICAÇÃO: NAASSON VICTOR LAURENTINO DE OLIVEIRA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : NAASSON VICTOR LAURENTINO DE OLIVEIRA
DATE: 31/03/2023
TIME: 14:00
LOCAL: Videoconferência: https://meet.google.com/ehd-mvey-cws
TITLE:

Arbuscular mycorrhizal fungi (Glomeromycota) in different phytophysiognomies in an Brejo de altitude in northeastern Brazil


KEY WORDS:

Mycorrhizae, taxonomy, highland humid forest, Caatinga, diversity.


PAGES: 44
BIG AREA: Ciências Biológicas
AREA: Botânica
SUBÁREA: Taxonomia Vegetal
SPECIALTY: Taxonomia de Criptógamos
SUMMARY:

An evident characteristic of the Brazilian semi-arid region, which includes the Caatinga, is the presence of mountains with an average of 1,000 meters in altitude with quite varied vegetation and these types of vegetation can also manifest in the plateaus, which are called highland swamps. The Brejos form “islands” of humid forests surrounded by dry vegetation and are characterized as part of the Atlantic Forest. When compared to the surrounding regions, the Brejos have privileged conditions in terms of soil and air humidity, temperature and vegetation cover. These characteristics influence the growth of microorganisms, however, in terms of soil microbiota, these areas are scarce in diversity studies, notably Arbuscular Mycorrhizal Fungi (AMF). These fungi, which form extensive symbiosis with plant roots, are of great importance for increasing the nutrient absorption zone and allowing plant growth. Therefore, this work aims to compare AMF communities between different phytophysiognomies in an altitude swamp of the Caatinga biome. For this, soil and litter samples were collected during the rainy season of January/2022, in the Ubajara National Park, Ceará. Two approaches were used to assess the richness and diversity of AMF in different phytophysiognomies, (i) extraction of glomerospores by wet sieving and centrifugation in water and sucrose (70%) and (ii) collection of glomerocarps, using tweezers and the aid of a magnifying glass hand. Subsequently, they were mounted on permanent slides with PVLG (polyvinyl acid lacto-glycerol) and PVLG + Melzer. 41 species of AMF were found. Eleven occurred in litter, recovered by collection; nine in the humid forest and four in the dry forest. While in the extraction of spores, 39 species were recovered; being 21 in the humid forest and 32 in the dry forest. Some species were identified only for one type of phytophysiognomy and/or methodology used. This indicates that, perhaps, the AMF have a preference for environments and/or strips of the terrestrial substrate. It is expected that AMF richness will be different in areas with different phytophysiognomies, especially if new methodological approaches are used, allowing a better understanding of the ecology of this group of fungi in
semi-arid environments.


COMMITTEE MEMBERS:
Presidente - 1755051 - BRUNO TOMIO GOTO
Externa à Instituição - KÁSSIA JÉSSICA GALDINO DA SILVA SCHINAIDER
Interna - ***.390.185-** - PATRÍCIA OLIVEIRA FIUZA - UFRN
Notícia cadastrada em: 21/03/2023 14:35
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