Endophytic fungi of Brunfelsia uniflora: isolation, cryopreservation, and determination of enzymatic and antioxidant activity.

Publisher: Springer Country of Publication: Germany NLM ID: 9012472 Publication Model: Electronic Cited Medium: Internet ISSN: 1573-0972 (Electronic) Linking ISSN: 09593993 NLM ISO Abbreviation: World J Microbiol Biotechnol Subsets: MEDLINE

Publication: 2005- : Berlin : Springer
Original Publication: Oxford, OX, UK : Published by Rapid Communications of Oxford Ltd in association with UNESCO and in collaboration with the International Union of Microbiological Societies, c1990-

Ascomycota* ; Cellulase* ; Solanaceae*; Antioxidants/chemistry ; Cryopreservation ; Endophytes/chemistry ; Fungi ; Laccase ; Phenols ; Plant Extracts/chemistry

Brunfelsia uniflora (Pohl.) D. Don (Solanaceae), commonly known as manacá-de-cheiro, is widely distributed in Brazil and used by local indigenous peoples as an antirheumatic, antisyphilitic, depurative, emetic, vermifuge, and purgative agent. Several studies have examined the biological activities and phytochemical profile of Brunfelsia; however, few have focused on the diversity of endophytic microorganisms that colonize members of the genus. This study aimed to isolate and cryopreserve endophytic fungi from B. uniflora and determine their cellulase, laccase, and antioxidant activities. Endophytic fungi were isolated from B. uniflora stems, cultured on wheat grains, immersed in a 150 g L ^-1 aqueous sucrose solution, and cryopreserved at - 80 °C for 1 and 6 months. Cellulase activity was determined by a qualitative test using carboxymethylcellulose medium and laccase activity by a quantitative test based on the oxidation of 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonate). Prior to antioxidant activity assays, fungi were grown in malt extract broth for production of mycelial biomass. A methanolic extract was prepared for evaluation of DPPH· scavenging activity, FRAP activity, and total phenolic content. A total of 46 endophytic fungal isolates were obtained from B. uniflora stems and classified into 24 groups according to morphological similarities. B. uniflora was shown to harbor different genera of ascomycete fungi as endophytic organisms. Mycelial viability was observed after 1 and 6 months of cryopreservation at - 80 °C. Fungi exhibited cellulase and laccase activities. Isolate CE23 had the highest laccase activity after 7 days of cultivation. Twelve isolates were found to have low total phenolic contents and DPPH· and FRAP activities.
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Keywords: Diversity; Enzyme; Medicinal plant; Preservation of microorganisms; Symbiosis

0 (Antioxidants)
0 (Phenols)
0 (Plant Extracts)
EC 1.10.3.2 (Laccase)
EC 3.2.1.4 (Cellulase)

Date Created: 20220420 Date Completed: 20220422 Latest Revision: 20220514

20240829

10.1007/s11274-022-03278-5

35441989