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Journal of Experimental Biology 44,523-528 (1966)
Published by Company of Biologists 1966

The Thermal Dependence of the Rates of Glycogen and Triglyceride Synthesis in the Mosquito

EMILE VAN HANDEL ¹

¹ Florida State Board of Health, Entomological Research Center, Vero Beach, Florida

1. Net synthesis of glycogen and triglycerides produced from 1 mg. of sugar by the female mosquito A. sollicitans was determined at different temperatures.

2. At each temperature 0·2 mg. of glycogen and 0·13-0·14 mg. of triglycerides was synthesized from 1 mg. of sugar.

3. The logarithm of the rate constant (the time required to synthesize 75 % of the maximum) was proportional with the reciprocal of the absolute temperature.

4. For triglyceride synthesis the Q₁₀ = 3 from 10 to 30° C.; for glycogen synthesis the Q₁₀ = 5 from 10 to 22·5°C., but from 22·5 to 35° C. the rate of glycogen synthesis was independent of the temperature (Q₁₀ = 0).

5. Crop emptying and sugar absorption are not rate-limiting factors.

6. Medial neurosecretory cells, which limit the maximum amount of glycogen that can be synthesized from sugar, do not affect the rate of synthesis.

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