TAILIEUCHUNG - A theoretical study on the sex pheromones of the rice moth, Corcyra cephalonica stainton
Molecular orbital calculations (AM1 type) were performed on the geometry optimized structures of various farnesal isomers and methyl esters of farnesoic acids. It has been found that the major component, E, E-farnesal, of the sex-pheromone for the rice moth, Corcyra cephalonica Stainton is chemically the most exothermic and stable of all the farnesal isomers. | Tr. J. of Biology 22 (1998) 229-232 © TÜBİTAK A Theoretical study on the Sex-pheromones of the Rice Moth, Corcyra cephalonica Stainton Lemi TÜRKER Middle East Technical University Department of Chemistry Ankara-TURKEY Recived: Abstract: Molecular orbital calculations (AM1 type) were performed on the geometry optimized structures of various farnesal isomers and methyl esters of farnesoic acids. It has been found that the major component, E, E-farnesal, of the sex-pheromone for the rice moth, Corcyra cephalonica Stainton is chemically the most exothermic and stable of all the farnesal isomers. Then, the resemblance of molecular shapes was detrmined in order to design more stable sex-attractants. Key Words: Corcyra cephalonica, Pyralidae, Galleriinae, molecular orbital calculations, pheromones. Prinç Güvesi Corcyra cephalonica Stainton’un Seks Feromonları Üzerine Teorik bir Araştırma Özet: Geometry optimize edilmiş çeşitli farnesal izomerleri ve farnesoic acid metil esterleri üzerinde moleküler yörünge hesaplamaları (AM1 tipi) yapılmıştır. Pirinç güvesi, Corcyra cephalonica. Stainton’un seks-feromonunun esas elemanı olan E, E-farnesal’ın, bütün farnesal izomerleri içinde kimyasal olarak en ekzotermik ve dayanaklı olduğu bulunmuştur. Müteakiben, daha dayanıklı seks-çekicileri tasarımı amacı ile, molekülsel şekil benzerlikleri tayin edilmiştir. Anahtar Sözcükler: Corcyra cephalonica, Pyralidae. Galleriinae, moleküler yörünge hesapları, feromonlar. Introduction The rice moth, Corcyra cephalonica Stainton (Pyralidae, Galleriinae) is a major pest of stored products and quite often its population thus its harm reaches very unplesant level in subtropical countries like India that, some extensive research has been carried out about the biology of this insect as well as different aspects of the sex pheromone (1, 2). In the Galleriinae subfamily of Pyralidae, mostly male pheromones emitted from wings glands to evoke females are common (3-7). Therefore, .
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