En. Zografou et al., Effect of phenylalanine and tyrosine analogues on Bactrocera oleae Gmelin (Dipt., Tephritidae) reproduction, J APPL ENT, 125(7), 2001, pp. 365-369
Citations number
21
Categorie Soggetti
Entomology/Pest Control
Journal title
JOURNAL OF APPLIED ENTOMOLOGY-ZEITSCHRIFT FUR ANGEWANDTE ENTOMOLOGIE
The effect of nine phenylalanine and tyrosine analogues at various concentr
ations upon the reproduction of adult olive fruit fly Bactrocera oleae Gmel
in (Diptera, Tephritidae), was tested. Fecundity (eggs/female/day) and perc
entage egg hatchability was significantly reduced by the following anti-ami
no acids (in parentheses are indicated the antagonized amino acid): p-fluor
o-DL-phenylalanine (phe), p-amino-DL- and -L-phenylalanine (tyr), 3-amino-L
-tyrosine (tyr) and L-mimosine (tyr), at concentrations of 0.1, 0.25, 0.05
and 0.5% in the diet, respectively. Hatchability was also affected by two o
ther analogues of phenylalanine and tyrosine, p-bromo-DL-phenylalanine at a
concentration of 10% and m-fluoro-DL-tyrosine at a concentration of 1.5%.
Insect survival was affected only by p-fluorophenylalanine and 3-amino-L-ty
rosine at concentrations 0.25 and 6%, respectively. No significant differen
ces were observed between the survival of the two sexes. Finally, beta -2-t
hienyl-DL-alanine (phe) and a-methyl-DL-p-tyrosine (tyr) did not affect any
of the parameters tested. Electron microscopy examination of the follicles
and the egg-shell structure of eggs laid by females fed with diets contain
ing p-amino-L-phenylalanine and 3-amino-L-tyrosine, revealed abnormalities
related to the eggshell fine structure.