Use this URL to cite or link to this record in EThOS:
Title: Cytogenetics and endosymbionts of mass reared Phytoseiidae mites used as biological control agents
Author: Guy, Jessica Jayne
ISNI:       0000 0004 7233 451X
Awarding Body: University of Reading
Current Institution: University of Reading
Date of Award: 2017
Availability of Full Text:
Access from EThOS:
Full text unavailable from EThOS. Restricted access.
Access from Institution:
With the continued growth in the use of Phytoseiidae mites as Acaraine Biological Control Agents (ASAs), I have aimed to assess the cytogenetics, reproductive systems and endosymbionts of three economically important mites, namely Phytoseiulus persimilis (Athias-Henriot, 1957), Neoseiulus (= Amblyseius) cucumeris (Oudemans 1930), and Typhlodromips (= Amblyseius) swirskii (Athias-Henriot, 1962), with an aim to better understand the biology of these three mite species. Screening by means of PCR to give an indication of the endosymbiotic fauna of these mites allowed for further experiments using novel techniques, allowing us to better understand the roles and interactions of endosymbionts in these mites. However, with conflicting interpretations in the data for the presence of endosymbionts in Phytoseiidae mites -their integrity as a true endosymbiont as opposed to being simple a gut contaminant proved inconclusive. I use a novel approach in these species - Fluorescent In Situ Hybridisation (FISH) -in order to further assess the presence, as well as the location of endosymbionts (Wolbachia) in these mass reared mite species. The mites in question here also follow a genetic system whereby all offspring require fertilization, and begin embryogenesis as diploids. Whereas the females remain diploid, the males become haploid throughout this process -known as pseudoarrhenotoky or parahaploidy. This project aims to give a better understanding ofthe parahaploid nature of these mites, investigating the cytogenetics using eggs of the three species in question and also investigating the relationships between endosymbionts and haplodiploidy.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available