GENETIC-BASIS OF ESTERASE, MALATE-DEHYDROGENASE AND PHOSPHOGLUCOISOMERASE ALLOZYMES IN THE 2-SPOTTED SPIDER-MITE, TETRANYCHUS-URTICAE KOCH

The genetic basis of esterase, phosphoglucoisomerase (PGI), and malate dehydrogenase (MDH) isozymes in the two-spotted spider mile, Tetranyc hus urticae KOCH, were studied by polyacrylamide gel electrophoresis. Based on their banding patterns, four loci were detected: Est-4, Est-5 , MDH, and PGI. Cross Experiments indicated that each of these loci wa s under the control of two codominant alleles, i.e. allozymes. Further , the results of the analysis indicated that the Est-4 and Est-5 alloz ymes were monomeric enzymes, and the MDH and PGI were dimeric enzymes. These four loci will be useful gene markers for studying the genetica l divergence of T. urticae.