Abstract
The genetic variation in phosphoglucoisomerase (PGI) and malate dehydrogenase (MDH) was studied in red-pigmented Japanese spider mites of the genus Tetranychus by means of poly-acrylamide gel electrophoresis. The analysis revealed (1) that Tetranychus kanzawai possesses five and three alleles for PGI and MDH, respectively and that PGI allele frequencies clearly differ between the Hokkaido and the Honshu populations (2) that Tetranychus urticae and Tetranychus pueraricola, two closely related species, have different alleles for PGI and (3) that two populations of Tetranychus piercei, a species which had only been found on the islands of Okinawa, were obtained from Honshu and that the PGI locus is fixed for different alleles in the two populations. The two enzyme systems are apparently useful not only for discrimination of spider mite species but also for the detection of intraspecific variation. © Rapid Science Ltd. 1998
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