Abstract
The developmental changes of tyrosinase activity in the silkworm egg of a wild type, two types of white-eyed mutant, kynureninehydroxylase-missing mutant ω 1, and ‘xanthommatine forming enzyme’-missing mutant ω 2 were investigated. In the wild type egg, the tyrosinase activity increases at the same time as the amount of 3-hydroxykynurenine decreases and the amount of ommochromes increases. In the other white-eyed mutants the maximum tyrosinase activity was on the second day after oviposition, and this activity decreased gradually, reaching a plateau on the tenth day. Tyrosinase also occurs in the ω 2 egg, although its activity is generally lower than that of the wild type egg during the developmental stages. It is therefore not likely that tyrosinase is a ‘xanthommatine forming enzyme’ in the silkworm egg.
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