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First published online June 16, 2004
Journal of Experimental Biology 207, 2685-2690 (2004)
Published by The Company of Biologists 2004
doi: 10.1242/jeb.01093

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Reduced juvenile hormone synthesis in mosquitoes with low teneral reserves reduces ovarian previtellogenic development in Aedes aegypti

Abrahim S. Caroci¹, Yiping Li² and Fernando G. Noriega^2,*

¹ Departamento de Parasitologia, Instituto de Ciencias Biomedicas, Universidade de Sao Paulo, Sao Paulo, SP, CEP 05,508-900, Brazil
² Department of Biological Sciences, Florida International University, Miami, FL 33199, USA

^* Author for correspondence (e-mail: noriegaf{at}fiu.edu)

Accepted 18 May 2004

We investigated the relationship among nutritional reserves, previtellogenic ovary development and juvenile hormone (JH) synthesis in Aedes aegypti female mosquitoes. By raising larvae under different nutritional regimes, two adult phenotypes (large and small females) were generated, which differed significantly in size at eclosion (measured by wing length). We measured the total amount of protein, lipids and glycogen in newly emerged (teneral) large and small females. Teneral reserves were significantly lower in small females. Maximum previtellogenic ovary development occurred only if enough teneral nutrients were present. Maximum previtellogenic ovary development was stimulated in small females with low teneral nutrients by topically applying a JH analog. The biosynthetic activity of Ae. aegypti corpora allata (CA) was studied in vitro using a radiochemical method. JH synthesis was significantly reduced in females emerged with low teneral reserves and stimulated by sugar feeding. These results establish that the CA synthesizes enough JH to activate ovary maturation only in the presence of large nutrient reserves.

Key words: Aedes aegypti, mosquito, juvenile hormone, corpora allata, nutrition, ovary

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