Applied and Environmental Microbiology (2004) 70, 5859-5867

Alida F. Janmaat, Ping Wang, Wendy Kain, Jian-Zhou Zhao and Judith Myers (2004)
Inheritance of resistance to Bacillus thuringiensis subsp. kurstaki in Trichoplusia ni
Applied and Environmental Microbiology 70 (10), 5859-5867
Abstract: The genetic inheritance of resistance to a commercial formulation of Bacillus thuringiensis subsp. kurstaki was examined in a Trichoplusia ni colony initiated from a resistant population present in a commercial vegetable greenhouse in British Columbia, Canada. Progeny of F₁ reciprocal crosses and backcrosses between F₁ larvae and resistant (P_R) and susceptible (P_S) populations were assayed at different B. thuringiensis subsp. kurstaki concentrations. The responses of progeny of reciprocal F₁ crosses were identical, indicating that the resistant trait was autosomal. The 50% lethal concentration for the F₁ larvae was slightly higher than that for P_S, suggesting that resistance is partially recessive. The responses of both backcross progeny (F₁ x P_R, F₁ x P_S) did not correspond to predictions from a single-locus model. The inclusion of a nonhomozygous resistant parental line in the monogenic model significantly increased the correspondence between the expected and observed results for the F₁ x P_R backcross but decreased the correspondence with the F₁ x P_S backcross results. This finding suggests that resistance to B. thuringiensis subsp. kurstaki in this T. ni population is due to more than one gene.
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Link to article at publishers website
Database assignments for author(s): Alida F. Janmaat, Ping Wang, Judith H. Myers

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
resistance/tolerance/defence of host

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Trichoplusia ni		Canada (west)
Bacillus thuringiensis var. kurstaki (entomopathogen)	Trichoplusia ni		Canada (west)