Development of polyembryonic insects: a major departure from typical insect embryogenesis

1998 ◽  
Vol 208 (2) ◽  
pp. 69-81 ◽  
Author(s):  
M. Grbić ◽  
Lisa M. Nagy ◽  
Micheal R. Strand
Keyword(s):  
Insect Embryogenesis

The effects of the insect growth regulator fenoxycarb on Rhodnius prolixus (Insecta, Hemiptera) embryogenesis

1986 ◽  
Vol 64 (11) ◽  
pp. 2425-2429 ◽  
Author(s):  
Gregory Mitchell Kelly ◽  
Erwin Huebner
Keyword(s):  
Growth Regulator ◽  
Developmental Stages ◽  
Dose Range ◽  
Insect Growth Regulator ◽  
Rhodnius Prolixus ◽  
Dorsal Closure ◽  
Cellular Mechanisms ◽  
Insect Embryogenesis ◽  
Insect Growth ◽  
Experimental Tool

Embryonic development of the hemipteran Rhodnius prolixus is perturbed by fenoxycarb (Ro 13.5223, Dr. R. Maag Ltd.), a non-neurotoxic insect growth regulator. Degree of perturbation is dependent on dose applied and embryonic stage at application time. Day 5 embryos were the most sensitive over a broad dose range. Treatment on day 8 had little effect, with normal hatching occurring 1 week later. Three developmental stages were most sensitive to perturbation: katatrepsis, dorsal closure, and eclosion. Katatrepsis, which normally occurs 168 h postoviposition, was the stage most prominently affected, suggesting that fenoxycarb interferes with basic mechanisms underlying this morphogenetic movement. Dorsal closure was the second most sensistive stage, the defect being characterized by embryos failing to completely enclose the yolk. Embryos receiving very low doses successfully completed katatrepsis and dorsal closure but were unable to hatch. Results demonstrate that fenozycarb may be a useful experimental tool for examining the normal cellular mechanisms of insect embryogenesis.

scholarly journals Visualizing Late Insect Embryogenesis: Extraembryonic and Mesodermal Enhancer Trap Expression in the Beetle Tribolium castaneum

PLoS ONE ◽  
2014 ◽  
Vol 9 (7) ◽  
pp. e103967 ◽  
Author(s):  
Stefan Koelzer ◽  
Yvonne Kölsch ◽  
Kristen A. Panfilio
Keyword(s):  
Tribolium Castaneum ◽  
Enhancer Trap ◽  
Insect Embryogenesis

The use of inherited abnormalities in studies on the embryogenesis of Dermestes maculatus (Coleoptera)

Development ◽  
1964 ◽  
Vol 12 (3) ◽  
pp. 539-549
Author(s):  
D. A. Ede ◽  
Anne M. Rogers
Keyword(s):  
Large Range ◽  
Normal Embryo ◽  
Primary Defect ◽  
Insect Embryogenesis ◽  
Dermestes Maculatus ◽  
Tissue Interactions ◽  
Developmental Mechanisms ◽  
Embryological Analysis

The possibility of using inherited abnormalities in place of conventional experimental embryological methods has been explored by several workers in Drosophila, where there is a large range of lethal and female sterile genes readily available (reviewed Waddington, 1956). These genes are usually pleiotropic, i.e. with manifold effects, and tracing these diverse effects back as far as possible to a single primary defect gives information about the corresponding developmental mechanisms in the normal embryo. Two disadvantages have attended these studies: (1) dipteran embryology is extremely specialized and difficult to relate to that of other insects, (2) it is almost entirely mosaic in character, and therefore throws no light on the important subject of tissue interactions. The present study was undertaken in order to extend this method of embryological analysis to an insect with a less specialized embryology, and hence to show its applicability to studies on insect embryogenesis in general.

A Model of Pattern Formation in Insect Embryogenesis

1977 ◽  
Vol 23 (1) ◽  
pp. 117-139
Author(s):  
H. MEINHARDT
Keyword(s):  
Positional Information ◽  
Posterior Pole ◽  
Morphogen Gradient ◽  
Insect Development ◽  
High Concentration ◽  
Insect Embryogenesis ◽  
Anterior Side ◽  
First Pass ◽  
Pass Through ◽  
The Individual

A model is proposed in which the interaction of an autocatalytic substance with a short diffusion range - the activator - and its more diffusible antagonist - the inhibitor - leads to a local high concentration of activator at the posterior pole of the egg. The inhibitor, which is then produced mainly in this activated region, diffuses into the rest of the egg, where it acts as a ‘morphogen’, forming a concentration gradient which supplies positional information. This model can account quantitatively for the patterns resulting from a large number of different experiments performed during early insect development, including ligation, u.v.-irradiation and microsurgical manipulations. The formation of additional posterior structures is interpreted as the result of the appearance of a new activator peak. Omission of segments after ligation of the egg is explained as the result of accumulation of morphogen (the inhibitor) at the posterior side of the ligation and a decrease of morphogen on the anterior side. In order to account for certain quantitative features of the ligation experiments it is necessary to assume that determination in response to the morphogen gradient is a slow, stepwise process, in which the nuclei or cells first pass through determination stages characteristic for more anterior structures until they ultimately form a given structure. The mutual interactions of activator and inhibitor are expressed as a set of partial differential equations. The individual experiments are simulated by solving these equations by use of a computer.

Insect embryogenesis – what is ancestral and what is derived?

Development ◽  
1994 ◽  
Vol 1994 (Supplement) ◽  
pp. 193-199
Author(s):  
Diethard Tautz ◽  
Markus Friedrich ◽  
Reinhard Schröder
Keyword(s):  
Pattern Formation ◽  
Genetic Analysis ◽  
Early Development ◽  
Molecular Mechanisms ◽  
Early Embryogenesis ◽  
Molecular Pathways ◽  
Deep Insight ◽  
Insect Embryogenesis ◽  
Definitive Answer ◽  
Insight Into

The systematic genetic analysis of Drosophila development has provided us with a deep insight into the molecular pathways of early embryogenesis. The question arises now whether these insights can serve as a more general paradigm of early development, or whether they apply only to advanced insect orders. Though it is too early to give a definitive answer to this question, we suggest that there is currently no firm reason to believe that the molecular mechanisms that were elucidated in Drosophila may not also apply to other forms of insect embryogenesis. Thus, many of the Drosophila genes involved in early pattern formation may have comparable functions in other insects and possibly throughout the arthropods.

Key roles of the Broad-Complex gene in insect embryogenesis

2010 ◽  
Vol 40 (6) ◽  
pp. 468-475 ◽  
Author(s):  
Maria-Dolors Piulachs ◽  
Viviana Pagone ◽  
Xavier Bellés
Keyword(s):  
Insect Embryogenesis ◽  
Broad Complex

The Analysis of Insect Embryogenesis

1961 ◽  
Vol 6 (1) ◽  
pp. 295-312 ◽  
Author(s):  
S. J. Counce
Keyword(s):  
Insect Embryogenesis
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