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Ayala-Zermeño MA, Gallou A, Berlanga-Padilla AM, Andrade-Michel GY, Rodríguez-Rodríguez JC, Arredondo-Bernal HC, Montesinos-Matías R. Viability, purity, and genetic stability of entomopathogenic fungi species using different preservation methods. Fungal Biol 2017; 121:920-928. [PMID: 29029699 DOI: 10.1016/j.funbio.2017.07.007] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2017] [Revised: 07/27/2017] [Accepted: 07/29/2017] [Indexed: 10/19/2022]
Abstract
Preservation methods for entomopathogenic fungi (EPF) require effective protocols to ensure uniform processes and to avoid alterations during storage. The aim of this study was to preserve Beauveria bassiana, Metarhizium acridum, M. anisopliae, M. rileyi, Isaria javanica, Hirsutella thompsonii, H. citriformis and Lecanicillium lecanii in mineral oil (MO), sterile water (SW), silica gel (SG), lyophilisation (L), ultracold-freezing at -70 °C, and cryopreservation at -196 °C. The viability and purity of the fungi were then verified: phenotypic characteristics were evaluated qualitatively at 6, 12 and 24 m. Genetic stability was tested by amplified fragment length polymorphisms (AFLP) analysis at 24 m. Of the eight species of EPF, three remained viable in SW, five in MO and L, six at -70 °C, seven in SG, and eight at -196 °C. No significant changes were observed in AFLP patterns at 24 m of storage. The most effective preservation methods for EPF were SG, L, -70 and -196 °C. Beauveria bassiana, M. acridum, M. anisopliae, M. rileyi and I. javanica remained stable with all methods, while the remaining species were less compatible. The optimisation of preservation methods for EPF facilitates the development of reliable protocols to ensure their inherent characteristics in culture collections.
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Affiliation(s)
- Miguel A Ayala-Zermeño
- Centro Nacional de Referencia de Control Biológico, SENASICA-DGSV-CNRF, Km 1.5 Carretera Tecomán-Estación FFCC, Col. Tepeyac, C.P. 28110, Tecomán, Colima, Mexico
| | - Adrien Gallou
- Centro Nacional de Referencia de Control Biológico, SENASICA-DGSV-CNRF, Km 1.5 Carretera Tecomán-Estación FFCC, Col. Tepeyac, C.P. 28110, Tecomán, Colima, Mexico
| | - Angélica M Berlanga-Padilla
- Centro Nacional de Referencia de Control Biológico, SENASICA-DGSV-CNRF, Km 1.5 Carretera Tecomán-Estación FFCC, Col. Tepeyac, C.P. 28110, Tecomán, Colima, Mexico
| | - Gilda Y Andrade-Michel
- Centro Nacional de Referencia de Control Biológico, SENASICA-DGSV-CNRF, Km 1.5 Carretera Tecomán-Estación FFCC, Col. Tepeyac, C.P. 28110, Tecomán, Colima, Mexico
| | - José C Rodríguez-Rodríguez
- Centro Nacional de Referencia de Control Biológico, SENASICA-DGSV-CNRF, Km 1.5 Carretera Tecomán-Estación FFCC, Col. Tepeyac, C.P. 28110, Tecomán, Colima, Mexico
| | - Hugo C Arredondo-Bernal
- Centro Nacional de Referencia de Control Biológico, SENASICA-DGSV-CNRF, Km 1.5 Carretera Tecomán-Estación FFCC, Col. Tepeyac, C.P. 28110, Tecomán, Colima, Mexico
| | - Roberto Montesinos-Matías
- Centro Nacional de Referencia de Control Biológico, SENASICA-DGSV-CNRF, Km 1.5 Carretera Tecomán-Estación FFCC, Col. Tepeyac, C.P. 28110, Tecomán, Colima, Mexico.
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Crahay C, Munaut F, Colpaert JV, Huret S, Declerck S. Genetic stability of ectomycorrhizal fungi is not affected by cryopreservation at -130 °C or cold storage with repeated sub-cultivations over a period of 2 years. MYCORRHIZA 2017; 27:595-601. [PMID: 28361204 DOI: 10.1007/s00572-017-0770-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2016] [Accepted: 03/23/2017] [Indexed: 06/07/2023]
Abstract
Cryopreservation is considered the most reliable method for storage of filamentous fungi including ectomycorrhizal (ECM) fungi. A number of studies, however, have reported genetic changes in fungus cultures following cryopreservation. In the present study, the genetic stability of six ECM fungus isolates was analyzed using amplified fragment length polymorphism (AFLP). The isolates were preserved for 2 years either by cryopreservation (at -130 °C) or by storage at 4 °C with regular sub-cultivation. A third preservation treatment consisting of isolates maintained on Petri dishes at 22-23 °C for 2 years (i.e., without any sub-cultivation) was included and used as a control. The differences observed in AFLP patterns between the three preservation methods remained within the range of the total error generated by the AFLP procedure (6.85%). Therefore, cryopreservation at -130 °C and cold storage with regular sub-cultivation did not affect the genetic stability of the ECM fungus isolates, and both methods can be used for the routine storage of ECM fungus isolates over a period of 2 years.
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Affiliation(s)
- Charlotte Crahay
- Earth and Life Institute, Applied Microbiology, Mycology, Université catholique de Louvain, Croix du Sud 2, bte L7.05.06, 1348, Louvain-la-Neuve, Belgium
| | - Françoise Munaut
- Earth and Life Institute, Applied Microbiology, Phytopathology, Université catholique de Louvain, Croix du Sud 2, bte L7.05.03, 1348, Louvain-la-Neuve, Belgium
| | - Jan V Colpaert
- Center for Environmental Sciences, Environmental Biology Group, Universiteit Hasselt, Agoralaan, Gebouw D, 3590, Diepenbeek, Belgium
| | - Stéphanie Huret
- Earth and Life Institute, Applied Microbiology, Mycology, Université catholique de Louvain, Mycothèque de l'Université catholique de Louvain (MUCL), Croix du Sud 2, box L7.05.06, 1348, Louvain-la-Neuve, Belgium
| | - Stéphane Declerck
- Earth and Life Institute, Applied Microbiology, Mycology, Université catholique de Louvain, Croix du Sud 2, bte L7.05.06, 1348, Louvain-la-Neuve, Belgium.
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