402.

Mittler TE. Ascorbic acid and other chelating agents in the trace-mineral nutrition of the aphid Myzus persicae on artificial diets. Entomol. Exp. Appl. 1976; 20(1):81-98. (CA) [Growth of the aphid M. persicae fed artificial diets in which the required trace minerals (Fe, Cu, Mn, and Zn) were incorporated as chlorides was compared to growth on diets in which the minerals were supplied as sodium EDTA complexes. If the mineral chlorides were allowed to interact with L-ascorbic acid prior to their incorporation into a diet, much less ascorbic acid was needed than if the ascorbic acid was added after incorporation of the mineral chlorides into a diet. Low levels of D-ascorbic acid or citric acid acted similarly to L-ascorbic acid. This was presumably by chelating the minerals. The complexes thus formed not only maintained the minerals in soln. for ingestion but appeared to facilitate their utilization by the aphids. However, higher levels of L-ascorbic acid were needed by the insects, presumably for purposes other than trace-mineral nutrition, when they were maintained for longer periods on the diets. Deterioration in the nutrient value of diets during 2-4 days at expd. temps. was less with diets contg. minerals complexed with citric acid than with ascorbic acid. Dietary riboflavine was detrimental to aphid growth. However, it was not established that this was the result of mineral deprivation through the formation of nutritionally available miner/riboflavine complexes. Enterobactin added to a diet effectively deprived the aphids of available Fe. Higher levels of dietary Fe could overcome such a deficiency.]

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