Banca de DEFESA: ROBERTA DE SOUZA SANTOS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : ROBERTA DE SOUZA SANTOS
DATA : 03/12/2019
HORA: 14:00
LOCAL: IMS/UFBA
TÍTULO:

TAXONIC AND FUNCTIONAL DIVERSITY OF ARBUSCULAR MICRORZIC FUNGI IN COFFEE WITH DIFFERENT TYPE OF MANAGEMENT IN ALTITUDE REGION

PALAVRAS-CHAVES:

Coffee arabica; cowpea; Glomeromycota; land use; sustainability.

PÁGINAS: 90
GRANDE ÁREA: Ciências Agrárias
ÁREA: Agronomia
SUBÁREA: Fitossanidade
ESPECIALIDADE: Microbiologia Agrícola
RESUMO:

Arbuscular mycorrhizal fungi (AMF) are considered mutualistic organisms that establish symbiotic relationships with most known plant species, offering plenty nutritional benefits. The knowledge regarding the diversity of these fungi is rather low, mainly in agroforestry systems and coffee plantations of Northeast Brazil. Thereby, our aim (1) was to examine the occurrence and diversity of AMF in growing coffee soils under different management (underneath grevília’s canopy and sun-grown with spacing of 1.7 x 0.7 cm and 2.5 x 0.5 cm), and in Soils of surrounding areas under pasture and native forest , located in the municipality of Barra do Choça, Bahia, Brazil and (2) to determine the efficiency of these fungal communities in cowpea (Vigna unguiculata (L.) Walp) culture. Part of soil samples of each area was sent to extraction and identification of AMF spores, whereasthe other was used in the trap culture experiment to determine the caupi-bean efficiency. The trap culture experiment was conductedin a greenhouse, in pots, by using a completely randomized design (CRD), with three repetitions, in which two AMF species in a mixture (Claroideoglomus etunicatum and Rhizophagus clarus) was used as reference treatment, one control treatment not inoculated and five treatments composed by AMF communities from the five areas sampled were analysed. After 80 days of plant growth the experiment was disassembled and the data was tabulated and statistically tested. Spores from 43 AMF morphotypes were recovered and identified from the field samples, distributed among 14 genera belonging to six Glomeromycota families: Glomeraceae (35%), Acaulosporaceae (35%), Gigasporaceae (21%), Ambisporaceae (5%), Archaeosporaceae (2%) e Diversisporaceae (2%). Overall, it was observed the predominance of occurrence of Acaulospora AMFs (34.8%) followed by Glomus (16.27%). According to the frequency of occurrence, Rhizophagus fasciculatus, Acaulospora mellea and Glomus sp.1 were the most dominant species in our study. In the coffee growing areas 12 generas were identified, two of these (Dominikia and Fuscutata) have never been reported in the literature associated to coffee growing in Brazil. Results from the trap culture experiment suggested that the reference treatment, as expected, showed significant results related to both shoot and root dry mass (SDM+RDM) of caupi-bean (7.55 g), and the soil from the shade-grown coffee treatment underneath grevílea was the closest to the reference treatment with values of (SDM+RDM) equal to (4.31 g) and phosphorus content equals to (7.60 g kg^-1). Although the treatment of coffee growing underneath native forest did not show any change related to dry mass of caupi-bean, it showed the highest diversity of AMF, 23 morphotypes, suggesting that high diversity of AMF does not translate, necessarily, into benefits to plants. This study advances significantly our knowledge regarding the community composition of AMF in soils of an important coffee growing location in the Brazilian northeast, showing that caupi-bean was responsive to the inoculation of many of these communities.

MEMBROS DA BANCA:
Interno - 2032145 - PATRICIA LOPES LEAL
Externo à Instituição - GABRIELE MARISCO DA SILA - UESB
Externo à Instituição - JOILSON SILVA FERREIRA - UESB