Journal of Nematology (2006) 38, p. 270 (Dillman et al.)

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A.R. Dillman, J.M. Chaston, D.I. Shapiro-Ilan, A. Bilgrami, R. Gaugler and B.J. Adams (2006)
Inbreeding and trait deterioration in entomopathogenic nematodes
Journal of Nematology 38 (2), 270-270
Abstracts of Society of Nematologists 45th Annual Meeting, Lihue, Hawaii, 18-21 June 2006
Abstract: Entomopathogenic nematodes (genera Heterorhabditis and Steinernema) are biocontrol agents that kill their invertebrate hosts with the aid of a mutualistic bacterium. Their use in field applications has achieved some success, although a lack of performance predictability has hindered their widespread acceptance in pest management programs. Because of the crucial nature of traits that affect the nematodes' ability to act as biological control agents (viz. virulence, heat tolerance, and fecundity), it is important to understand trait loss in laboratory culturing. Our study aims to discover the cause of avirulence generated through in vitro culturing of nematodes by considering the major factors that influence genetic changes under laboratory conditions: drift, selection, and inbreeding. We answer these questions by performing sexual crosses of inbred nematodes with each other and with the wild-type parental strain. Our results show a successful recovery of both fecundity and heat tolerance in Steinernema carpocapsae, revealing that the development of avirulence is genetic and occurs by inbreeding. We explore two theories that seek to explain the existence of inbreeding depression: the overdominance and partial dominance hypotheses. Based on predictions specific to each hypothesis, we conclude that our results support the theory of overdominance.
Database assignments for author(s): David I. Shapiro-Ilan, Byron J. Adams

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
rearing/culturing/mass production


Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.


Steinernema carpocapsae/Xenorhabdus nematophila (entomopathogen)