Journal of Microbiology

Megabase-sized DNA Isolation and Electrophoretic Karyotype of Fusarium oxysporum Schlecht: Park, Min Seon , Min, Byung Re; J. Microbiol. 1995;33(2):132-135.

Abstract: To investigate the electrophoretic karytype of Fusarium oxysporum, intact chromosomal DNA was separated by pulsed-field gel electrophoresis (PEGE). DNA extraction from nulcei, mycelia and protoplasts were compared with one another and with the quantity and the suitability for PFGE separation in agarose gel. As a result, the most useful extracting method for intact DNA was found to be that from protoplasts. By varying the electrophoretic conditions, 8 chromosomal DNA bounds were resolved. Using the Schizosaccharomyces pombe and Saccharomyces cerevisiae as size standards, the size of Fusarium oxysporum chromosomes was estimated to range from approximately 0.6 Mb TO 6.7 Mb, and total genome size was 26.7 Mb. The suitability of electrophoretic karyotyping as a tool for strain characterization is discussed.

Comparison of electrophoretic karyotypes in fusarium: Min , Byung Re; J. Microbiol. 1995;33(4):334-338.

Abstract: The electrophoretic karyotypes of 6 species in different Fusarium sections were examined by using contour-clamped homogeneous electric field (CHEF) gel electrophoresis. Intact chromosomal DNA was prepared from protoplasts and up to 9 distinct bands were separated on 0.7% or 0.8% agarose gel under several different conditions. Putative chromosome numbers varied from 6 to 9 amd polymorphic karyotypes were observed in different Fusarium sections. Using Schizosaccharomyces pombe and Saccharomyces cerevisiae chromosomes as standards, the sizes of the Fusarium spp. chromosomes were estimated. The electrophoretic karyotypes of F. moniliforme and F. subglutinans (section Liseola) were similar. Unidentified filamentour fungi, F. beomiforme was much closer to F. axysporum (section Elecgans) in karyotype and the karyotypes of F. napiforme were more similar to those of section Liseola than any other sections. F. graminearum (section Discolor) had a distinctive electrophoretic karyotype.

Electrophoretic Karyotypes of Fusarium oxysporum formae speciales: Min, Byung Re , Kim, Kyung Ah , Choi, Yong Keel; J. Microbiol. 1998;36(1):14-19.

Abstract: Chromosomal DNAs from nine strains of Fusarium oxysporum formae speciales were analysed by pulsed field gel electrophoresis (PFGE). Intact chromosomal DNA were prepared from fungal protoplasts. About 7-13 chromosomal DNA bands were separated in nine Fusarium oxysporum formaespeciales, ranging in size from 0.8 to 6.7 Mb. Considering that some of the chromosomal bands represented unresolved doublets, the total genome size was estimated to vary between at least 22.3 and 45.5 Mb. Gels run under different conditions were Southern blotted and probed with randomly selected genomic DNA from Fusarium oxysporum f. sp. lilii. Electrophoretix karyotyping revealed some differences within and between Fusarium oxysporum formae speciales.

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