Journal
ANNUAL REVIEW OF ENTOMOLOGY
Volume 68, Issue -, Pages 451-469Publisher
ANNUAL REVIEWS
DOI: 10.1146/annurev-ento-120120-100746
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Insect eggs face various threats from their environment, both non-living and living. They rely on a combination of innate development and genetic traits from their parents for survival. Recent evidence suggests that parents adjust egg characteristics to suit the environment, while eggs themselves respond to environmental challenges and are affected by associated microbes. This review highlights the phenotypic plasticity of insect eggs and their active interaction with the environment.
Insect eggs are exposed to a plethora of abiotic and biotic threats. Their survival depends on both an innate developmental program and genetically determined protective traits provided by the parents. In addition, there is increasing evidence that (a) parents adjust the egg phenotype to the actual needs, (b) eggs themselves respond to environmental challenges, and (c) egg-associated microbes actively shape the egg phenotype. This review focuses on the phenotypic plasticity of insect eggs and their capability to adjust themselves to their environment. We outline the ways in which the interaction between egg and environment is two-way, with the environment shaping the egg phenotype but also with insect eggs affecting their environment. Specifically, insect eggs affect plant defenses, host biology (in the case of parasitoid eggs), and insect oviposition behavior. We aim to emphasize that the insect egg, although it is a sessile life stage, actively responds to and interacts with its environment.
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