<p><strong>Chemosensory systems in predatory mites: from ecology to genome</strong></p>

Abstract

The reception of chemical cues in the environment is essential for the survival of almost all organisms, including phytoseiid mites. Compared with the progress made in the field of insect olfaction, the understanding of how predatory mites perceive chemical compounds and react to their surroundings is merely fragmentarily documented in past decades. In this review, we provide a guide in the field from chemoecology of herbivore-induced plant volatiles (HIPVs) as early as 1980s to the advances made in comparative genomics of predatory mites in 2019. We present from three aspects, i.e., chemosensory-guided feeding behavior, sensory structures and chemoreceptors predicted from genomes. The molecular principles of chemosensory system remain exciting areas for future research, since insights into the mechanisms underlying the sensing of chemical signals will not only contribute to a better understanding of predator behavior and physiology but may also open new avenues for the development of more specific and sustainable approaches to control pests by manipulating behaviors in predators. We then suggest three directions for future research: 1) chemoreceptor gene identification and function verification; 2) neural response circuit to stimuli and 3) application of chemoperception on feeding behavior. The potential methods and techniques are provided as well.