title: Variability among strains of Aspergillus section Nigri with capacity to degrade tannic acid isolated from extreme environments.
abstract: Tannins are polyphenolic compounds that cause astringent flavor and turbidity in food. Tannase is an enzyme that catalyzes the hydrolysis of tannins and is used in food industry. This study was conducted to determine the genetic variability and the tannase alleles variation in fungal strains isolated from soil and plants at five extreme areas of Coahuila, México. Two screening assays under 1 and 20 % of tannic acid were performed, with the isolations. In these assays, it was possible to identify 756 and 128 fungal strains, respectively. The major fungal variability was observed in "Cuatro Ciénegas" with 26 strains. The microorganisms were distributed in 11 groups, which correspond to Aspergillus section Nigri. AN7 and AN1 groups showed the major number of isolates from "Paila" and "Cuatro Ciénegas" locations, respectively. In the last location, the major diversity and specific richness were found. But in "Ojo Caliente," tannase allele conservations were observed.
authors.affiliation: Food Research Department, Universidad Autónoma de Coahuila, 25280, Saltillo, Coahuila, Mexico.
authors.forename: F
authors.initials: F
authors.lastname: Lara-Victoriano
authors.affiliation: Food Research Department, Universidad Autónoma de Coahuila, 25280, Saltillo, Coahuila, Mexico.
authors.forename: F
authors.initials: F
authors.lastname: Veana
authors.affiliation: Department of Plant Breeding and Agricultural Parasitology, Universidad Autónoma Agraria Antonio Narro, 25315, Saltillo, Coahuila, Mexico.
authors.forename: F D
authors.initials: FD
authors.lastname: Hernández-Castillo
authors.affiliation: Food Research Department, Universidad Autónoma de Coahuila, 25280, Saltillo, Coahuila, Mexico.
authors.forename: C N
authors.initials: CN
authors.lastname: Aguilar
authors.affiliation: Department of Plant Breeding and Agricultural Parasitology, Universidad Autónoma Agraria Antonio Narro, 25315, Saltillo, Coahuila, Mexico.
authors.forename: M H
authors.initials: MH
authors.lastname: Reyes-Valdés
authors.affiliation: Food Research Department, Universidad Autónoma de Coahuila, 25280, Saltillo, Coahuila, Mexico. raul.rodriguez@uadec.edu.mx.
authors.forename: R
authors.initials: R
authors.lastname: Rodríguez-Herrera
mesh_terms: D001230:Aspergillus / Q000201:enzymology / Q000235:genetics / Q000302:isolation & purification* / Q000378:metabolism*; D002265:Carboxylic Ester Hydrolases / Q000235:genetics / Q000378:metabolism; D000071251:Extreme Environments; D005656:Fungal Proteins / Q000235:genetics / Q000378:metabolism; D008800:Mexico; D010944:Plants / Q000382:microbiology; D012988:Soil Microbiology; D013634:Tannins / Q000378:metabolism*
chemical_list: D005656:Fungal Proteins; D013634:Tannins; D002265:Carboxylic Ester Hydrolases; C022711:tannase
keywords: Aspergillus niger; Cuatro Ciénegas; Info-Gen; Tannase; Tannic acid