Jagadeesan, R. and Collins, P. J. and Daglish, G. J. and Ebert, P. R. and Schlipalius, D. I. (2012) Phosphine Resistance in the Rust Red Flour Beetle, Tribolium castaneum (Coleoptera: Tenebrionidae): Inheritance, Gene Interactions and Fitness Costs. Plos One, 7 (2). ISSN 1932-6203
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Article Link(s): http://dx.doi.org/10.1371/journal.pone.0031582
The recent emergence of heritable high level resistance to phosphine in stored grain pests is a serious concern among major grain growing countries around the world. Here we describe the genetics of phosphine resistance in the rust red flour beetle Tribolium castaneum (Herbst), a pest of stored grain as well as a genetic model organism. We investigated three field collected strains of T. castaneum viz., susceptible (QTC4), weakly resistant (QTC1012) and strongly resistant (QTC931) to phosphine. The dose-mortality responses of their test- and inter-cross progeny revealed that most resistance was conferred by a single major resistance gene in the weakly (3.2x) resistant strain. This gene was also found in the strongly resistant (431x) strain, together with a second major resistance gene and additional minor factors. The second major gene by itself confers only 12-206x resistance, suggesting that a strong synergistic epistatic interaction between the genes is responsible for the high level of resistance (431x) observed in the strongly resistant strain. Phosphine resistance is not sex linked and is inherited as an incompletely recessive, autosomal trait. The analysis of the phenotypic fitness response of a population derived from a single pair inter-strain cross between the susceptible and strongly resistant strains indicated the changes in the level of response in the strong resistance phenotype; however this effect was not consistent and apparently masked by the genetic background of the weakly resistant strain. The results from this work will inform phosphine resistance management strategies and provide a basis for the identification of the resistance genes.
|Business groups:||Crop and Food Science|
|Additional Information:||Jagadeesan, Rajeswaran Collins, Patrick J. Daglish, Gregory J. Ebert, Paul R. Schlipalius, David I.|
|Subjects:||Plant culture > Seeds. Seed technology|
Plant pests and diseases > Pest control and treatment of diseases. Plant protection > Pesticides
|Deposited On:||09 Apr 2014 03:02|
|Last Modified:||09 Apr 2014 03:02|
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