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245 1 0 _aLong-term cryopreservation of non-spore-forming fungi in Microbank tm beads for plant pathological investigations
490 0 _vJournal of MicroBiological Methods, 148, p.120-126, 2018
520 3 _aLong-term preservation of experimental fungi without genetic, morphological, and pathogenic changes is of paramount importance in mycological and plant pathological investigations. Several cryogenic and non-cryogenic methods are available for the preservation of fungi, but the methods can be cumbersome, hazardous, expensive, and often not suitable for long-term storage of non-spore-forming (sterile)fungi. A method of preservation of spore-forming fungi in commercially available porous beads (MicrbankT)under cryogenic condition was successfully tested for three non-spore-forming basidiomycetes genera: Rhizoctonia solani (teleomorph: Thanatephorus cucumeris)(n = 19), Ceratobasidium species (n = 1), and Waitea circinata (n = 3), and a non-spore forming ascomycetes, Sclerotinia sclerotiorum (n = 1). For comparison, spore-forming ascomycetous fungi, Alternaria alternata (n = 1), Bauveria basiana (n = 2), Botrytis cinerea (n = 1), Fusarium oxysporum f.sp. gladiolii (n = 1), Trichoderma spp. (n = 3), and Thielaviopsis basicola (n = 2)were also cryopreserved in Microbank beads. Viable fungal isolates of all test species were retrieved after five years of storage at -80 °C, which was longer than the viabilities of the corresponding isolates cryopreserved in agar plugs or colonized wheat seeds. Fungi revived from the Microbank beads maintained identical morphology and cultural characteristics of the parent isolates. Randomly selected Rhizoctonia isolates revived from the Microbank beads maintained respective pathological properties of the parent isolates; also, no mutation was detected in the internal transcribed spacer (ITS)ribosomal DNA when compared with respective cultures maintained at ambient temperature. This finding demonstrated the utility of cryopreservation in Microbank beads as a convenient alternative to conventional long-term preservation of a wide group of fungal cultures for plant pathological investigations and serves as the first report of using porous beads under cryogenic conditions for long-term storage of sterile fungi.
650 1 4 _aRHIZOCTONIA SOLANI
650 1 4 _aNON-SPORE-FORMING FUNGI
650 1 4 _aLONG-TERM PRESERVATION
650 1 4 _aCRYOPRESERVATION
650 1 4 _aMICROBANK BEADS
700 1 2 _aLakshman, D. K.
700 1 2 _aSingh, V.
700 1 2 _aCamacho, M. E.
856 4 0 _uhttps://drive.google.com/file/d/1xXdRUluhrT3xjWJyA758o-xmzJgmdCpz/view?usp=drivesdk
_zPara ver el documento ingresa a Google con tu cuenta: @cicy.edu.mx
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