Effect of juvenile hormone analogue (Admiral) on embryogenesis of the soft tick Argas persicus (Oken) | ||
| Egyptian Academic Journal of Biological Sciences. A, Entomology | ||
| Article 22, Volume 2, Issue 1, June 2009, Pages 165-176 PDF (5.5 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/eajbsa.2009.15716 | ||
| Authors | ||
| Nadia H. Ahmed; Wafaa A. Radwan; Noha A. Guneidy; Shimaa S. Mohammed | ||
| Department of Entomology, Faculty of Science, Ain-Shams University | ||
| Abstract | ||
| Embryonic development of the fowl tick A. persicus was investigated during cleavage stage, blastoderm formation, gastrulation and organogenesis. Cleavage started 1 h post-oviposition (POP) and is indicated by presence of vitellophages of different sizes. Blastoderm is formed at 48 h POP. Secondary vitellophages are observed by 24 h POP. By 72 h POP, the germ band is formed. At 96 h POP, while the embryonic envelops are formed, gastrulation of the germ band takes place. Segmentation and differentiation of germ band, as well as, blastokinesis occur at 120 h POP. The stomodaeal and proctodaeal invagination started to differentiate at 120 h POP. The anterior and posterior midgut rudiments can be observed at 144 h POP. By 168 h POP, the nervous system, as well as, rectal sac and malpighian tubules are formed. Histological study revealed that application of JHA (Admiral) to newly laid eggs of A. persicus blocked the embryonic development of affected eggs at cleavage stage and before blastoderm and pole cells formation. In 24 h-old treated eggs, few cleavage nuclei appeared with absence of secondary vitellophages and pole cells. In 48 h-old treated eggs, the blastoderm was rudimentary and irregularly arranged. In 72 h-old treated eggs, disintegration of the rudimentary blastoderm and cracking of the cytoplasm could be seen. Starting from 96-old eggs until hatching at 168 h, complete destruction of the eggs was clear. | ||
| Keywords | ||
| Argas persicus; Juvenile hormone analogue; embryogenesis | ||
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