Abstract
The karyotype of Flammulina velutipes (Curt. : Fr.) Sing. was investigated using contour-clamped homogeneous electric fields (CHEF) gel electrophoresis. A parental dikaryotic stock, JA, was resolved into at least eight chromosomal DNA bands ranging from 1.4- to 4.9-megabase (Mb) pairs. Overall, little size variation was found among monokaryotic strains with a few major exceptions. Among 13 monokaryotic progenies examined, 11 strains were resolved into at least eight chromosomal DNA bands in a manner similar to the parent dikaryon, whereas the other 2 were resolved into at least seven chromosomes lacking the 2.1-Mb chromosome possessed in the former. A slightly larger size variation was found in a chromosome carrying ribosomal DNA. An estimated haploid genome size of this stock was 24.0Mb or more.
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