Banca de DEFESA: NAASSON VICTOR LAURENTINO DE OLIVEIRA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : NAASSON VICTOR LAURENTINO DE OLIVEIRA
DATE: 21/04/2023
TIME: 14:00
LOCAL: Videoconferência: https://meet.google.com/ymh-svvy-qai
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: 57
BIG AREA: Ciências Biológicas
AREA: Botânica
SUBÁREA: Taxonomia Vegetal
SPECIALTY: Taxonomia de Criptógamos
SUMMARY:

The “Brejos de altitude” are understood as “islands” of humid forests surrounded by dry vegetation and are characterized as part of the Atlantic Forest, within the Caatinga Domain. These environments are generally areas with particular characteristics and privileged conditions in terms of soil and air humidity, temperature and vegetation cover. These factors influence the development of microorganisms, however, in relation to soil microbiota, these areas are scarce in studies on diversity, notably Arbuscular Mycorrhizal Fungi (AMF). These fungi, which form extensive symbiosis with plant roots, are important for increasing the nutrient absorption zone and promoting plant growth. However, knowledge of the diversity, richness and ecological strategies of these fungi in high altitude areas is incipient and requires further research. This work aims to compare AMF communities between different phytophysiognomies in an brejos de altitude of the Caatinga Domain. 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. Fifty-four AMF species were found, of which 39 were found in the humid forest soil and 39 in the dry forest soil. 14 species occurred in litter recovered by collection; being 10 in the humid forest and seven in the dry forest. Some species were identified only for one type of vegetation and/or substrate. This indicates that, perhaps, the AMF have a preference for environments and/or strips of the terrestrial substrate. They also demonstrate the importance of environments such as brejos de altitude being studied in terms of the AMF community. In addition, new methods can expand knowledge about the ecology of the group.

COMMITTEE MEMBERS:
Presidente - 1755051 - BRUNO TOMIO GOTO
Externa à Instituição - CAMILA PINHEIRO NOBRE - UEMA
Interna - ***.390.185-** - PATRÍCIA OLIVEIRA FIUZA - UFRN