Abstract
Restriction fragment length polymorphisms (RFLPs) of mitochondrial DNA (mtDNA) in 34 isolates of the oyster mushroom, Pleurotus ostreatus , from throughout the northern hemisphere, were employed to evaluate genetic relatedness among natural populations. Eighteen isolates were from Japan, ten from Europe, five from U.S.A., and one from Korea. Bam HI, Eco RI and Eco RV digests of mtDNAs produced 18, 19 and 19 distinct RFLP patterns, respectively. By combining all RFLP patterns obtained with the three endonucleases, mtDNAs could be assigned to 22 different classes that were clustered phenetically into three major similarity groups, each of which represents a geographically distinct population. The results suggest that geographical distance between natural populations of P. ostreatus is correlated with genetic divergence.
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