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| Author(s): |
Gabriela Martins Reis
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | São Paulo. |
| Institution: | Universidade de São Paulo (USP). Instituto de Ciências Biomédicas (ICB/SDI) |
| Defense date: | 2009-12-08 |
| Examining board members: |
Benedito Correa;
Myrna Sabino;
Marcia Ribeiro Pinto da Silva
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| Advisor: | Benedito Correa |
| Field of knowledge: | Agronomical Sciences - Food Science and Technology |
| Indexed in: | Banco de Dados Bibliográficos da USP-DEDALUS; Biblioteca Digital de Teses e Dissertações - USP |
| Location: | Universidade de São Paulo. Biblioteca do Instituto de Ciências Biomédicas ; T-ICB BMM QW4; R375vg |
| Abstract | |
This study aimed to draw a phylogenetic dendogram of Aspergillus flavus strains isolated from fresh harvested peanut from four regions of São Paulo state (Cafelândia, Jaboticabal, Rosália and Tupã), to determine the toxigenic potential and to group them regarding the sclerotia production pattern. The AFLP thecnique was used for genotypic characterization. Aflatoxin production was evaluated by inoculation of fungi in coconut agar, extraction with chloroform, TLC segregation and quantification by spectrophotometer CS-9000. Agar Czapeck-DOX was used to evaluate sclerotia production. AFLP generated 78 fragments varying from 27 pb to 365 pb, 13 % of them were not polymorphic. The genotypic profile showed 31 haplotypes and 12 groups in the dendogram. The similarity among the isolates varied from 37 to 90 %. The aflatoxigenic potential showed 91,7 % of producer strains, with levels between 39,27 mg/Kg and 28689,61 mg/Kg for AFB1 and between 1,50 mg/Kg and 9781,09 mg/Kg for AFB2. Concerning the sclerotia production, 83,9 % of the strains were producers, all were S type. (AU) | |