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FUNCTIONAL SIGNIFICANCE OF INDOLE ALKYLAMINES LINKED TO NUTRITIONAL FACTORS IN WING DEVELOPMENT OF THE APHID MYZUS PERSICAE

Presumptive alatiform larvae deposited by groups of plant‐reared apterous Myzus persicae can be diverted to an apterous course of development on artificial diets, which, although providing all essential nutrients, have an amino nitrogen ratio suboptimal for growth. These results are in contradiction to a widely accepted assumption that poor nutrition induces alata‐production. Experiments with a newly developed continuous‐flow artificial feeding apparatus for aphids showed that a nutritionally imbalanced diet may indeed favour wing production in case such a diet stimulates restlessness of the aphids. The tendency to follow an apterous course of development can be neutralized by inhibitors of the synthesis of indole alkylamines in new‐born larvae, reared under conditions of controlled crowding stimuli. The possible significance of monoamine metabolism in wing formation of M. persicae is discussed.