Banca de DEFESA: ALYSSON LIMA DA SILVA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : ALYSSON LIMA DA SILVA
DATE: 16/03/2023
TIME: 09:00
LOCAL: Prédio Prof. Mateus Rosas Ribeiro
TITLE:

Growth promoting bacteria of nickel hyperaccumulator plants in ultramaphic soils

KEY WORDS:

PGPB. phytoextraction. Lippia lupulina. Justicia lanstyakii.

PAGES: 50
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUBÁREA: Ciência do Solo
SUMMARY:

Ultramafic soils originate from mafic or serpentinized mafic rocks and correspond to approximately 3% of the earth's surface. Due to its mineralogy, it has high levels of heavy metals and low fertility, which makes it unproductive for agricultural activity. An alternative to low productivity agriculture is agromining, which consists of obtaining economically important metals, such as nickel, through phytoextraction carried out by hyperaccumulating plants. They are able to retain high levels of metals in their tissues. Research has reported that these microorganisms may favor the development of hyperaccumulators by providing nutrients and substances that confer tolerance to the high concentration of metals in the soil. Therefore, the objective of this work was to elaborate a collection of Plant Growth Promoting Bacteria (PGPB) from ultramafic soils and from metal hyperaccumulating plants. For this, bacteria were isolated from samples of rhizospheric soil, from the hyperaccumulator plants Lippia lupulina and Justicia lanstyakii, and from adjacent soil, from Niquelândia - GO. The rhizobacteria were isolated in 10 % TSA medium, had the growth promotion mechanisms characterized and were identified through sequencing of the 16S rRNA gene. Thus, a collection composed of 66 bacteria tolerant to 7.5mM NiSO4 6H2O was obtained. Of this total, 18% produced Indole Acetic Acid (IAA), 26% solubilized calcium phosphate, 47 % performed Biological Nitrogen Fixation (BNF) and 17 % produced siderophores. 45 were genetically identified, of which 31% belong to the genus Bacillus sp., 22 % Alcaligenes sp., 15,55 % Providencia sp., 4 % Enterobacter sp. and 2 % Priestia sp. Therefore, it can be inferred that the elaborated collection has potential for use in future research to improve agromining and phytoremediation of soils contaminated by heavy metals.

COMMITTEE MEMBERS:
Interno - CLISTENES WILLIAMS ARAUJO DO NASCIMENTO
Presidente - GISELLE GOMES MONTEIRO FRACETTO
Externo à Instituição - JAKSON LEITE - IFPA