Banca de QUALIFICAÇÃO: ANA PAULA GURJÃO DE ASSIS

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : ANA PAULA GURJÃO DE ASSIS
DATE: 26/02/2025
TIME: 14:00
LOCAL: Auditório da Pós-graduação em solos
TITLE:

NATIVE FUNGI FROM THE AMAZON PROMOTE GROWTH IN TWO AÇAI CULTIVARS

KEY WORDS:

Euterpe oleracea, biostimulants, photosynthesis

PAGES: 43
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUBÁREA: Fitossanidade
SPECIALTY: Microbiologia Agrícola
SUMMARY:

The açaí (Euterpe oleracea) has gained national and international prominence, expanding its market previously strengthened by regional consumption. This fact drives the demand for quality seedlings. However, the slow growth and high demand for water and nutrients of this palm tree makes the production of seedlings limited, thus showing the need to implement new technologies that can meet the demand of the new market. The objective of the research was to evaluate the growth promotion in seedlings of two açaí cultivars inoculated with native Amazonian fungi. The experiment was carried out in a completely randomized design with a 2x3 double factorial scheme, with two açaí cultivars (BRS Pará and Chumbinho) and 3 inoculations (UFRA_Ma62, UFRA_Bb05 and control) to form 6 treatments with 4 replicates each. The data were subjected to analysis of variance and, when significant, the means of the treatments were compared by Duncan's test (P ≤ 0.05). The inoculation of Amazonian fungi promoted the growth of açaí cultivars. The highlight was the inoculation of UFRA_Ma62 in the BRS Pará cultivar, which increased height by 40%, stem diameter by 63%, leaf area by 53%, root length by 46% and root volume by 96% compared to the control. These biometric gains were associated with increases of 112% in shoot biomass, 120% in root biomass and 115% in total biomass. Gas exchange also improved in BRS Pará inoculated with UFRA_Ma62, with increases of 74% for net photosynthesis, 81% for carboxylation efficiency and 43% for water use efficiency compared to the control. Photochemical efficiency followed gas exchange with gains of 34% for chlorophyll content and regulation of thermal dissipation with a 127% decrease in heat loss (NPQ) compared to the control. Antioxidant pigments were higher in seedlings inoculated with Amazonian fungi. UFRA_Ma62 induced increases of 50% for anthocyanins and 79% for flavonoids in BRS Pará. The highest carotenoid contents were highlighted for Chumbinho inoculated with UFRA_Ba05, which increased by 106% compared to the control. Therefore, the inoculation of UFRA_Ma62 and UFRA_Ba05 fungi promotes the growth of both açaí cultivars, with emphasis on BRS Pará inoculated with UFRA_Ma62, which induced more pronounced morphophysiological and biochemical responses. The results reveal possible modulation of photosynthetic performance to maximize CO2 fixation, which is necessary to sustain higher growth. The inclusion of Amazonian fungi in the seedling production system can contribute to accelerate growth, reduce nursery time and increase the availability of seedlings for the field.

COMMITTEE MEMBERS:
Presidente - 1065086 - GLEDSON LUIZ SALGADO DE CASTRO
Interna - 3266519 - TELMA FATIMA VIEIRA BATISTA
Externa à Instituição - MARCELA CRISTIANE FERREIRA RÊGO - UEPA
Externo à Instituição - RODOLFO INACIO NUNES SANTOS - SEMAS