A comparison of interfertility and in vitro DNA-DNA reassociation as criteria for speciation in the genus Kluyveromyces |
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Authors: | J P van der Walt Elzbieta Johannsen |
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Institution: | (1) Microbiology Research Group, Council for Scientific and Industrial Research, P.O. Box 395, 0001 Pretoria, South Africa |
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Abstract: | Hybridization studies based on the use of the prototrophic selection technique were undertaken to compare interfertility and DNA-DNA reassociation as criteria for speciation purposes in the yeast genus Kluyveromyces. Degrees of DNA-DNA reassociation > 70% between strains as reported in the literature, were found to correlate with high recombination frequencies. Degrees of DNA-DNA reassociation < 20% between strains did however, not invariably coincide with the absence of interfertility between strains. If interfertility is accepted as criterion for conspecificity, the hitherto reported low degrees ( < 20%) of DNA-DNA reassociation in Kluyveromyces cannot confidently be employed for speciation purposes. |
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