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Significant population genetic structuring in Rhyzopertha dominica across Turkey: Biogeographic and practical implications

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McCulloch, G. A., Gurdasani, K., Kocak, E., Daglish, G. J. and Walter, G. H. (2020) Significant population genetic structuring in Rhyzopertha dominica across Turkey: Biogeographic and practical implications. Journal of Stored Products Research, 85 . p. 101536. ISSN 0022-474X

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Article Link(s): https://doi.org/10.1016/j.jspr.2019.101536

Publisher URL: http://www.sciencedirect.com/science/article/pii/S0022474X19303984

Abstract

Rhyzopertha dominica is a key pest of stored grain. Understanding the movement of this beetle on broad geographic scales is crucial, particularly when developing strategies to prevent the spread of phosphine resistance. We assessed population genetic structuring in this pest across Turkey, using a combination of mitochondrial (cytochrome oxidase I) and microsatellite markers. In addition, we screened samples for Wolbachia, as this endosymbiont has previously been suggested to be associated with low mitochondrial genetic diversity in this beetle. Mitochondrial genetic diversity was low, with only six haplotypes identified. The genetic diversity was, however, substantially higher than that previously found in Australia or India, suggesting that R. dominica may have originated in the Middle East. Wolbachia were detected only at a single site, indicating they are not impacting the mitochondrial genetic diversity of R. dominica across Turkey. Microsatellite markers indicated there is significant geographic genetic structuring across Turkey, even among sites less than 100 km apart, suggesting there is little movement of beetles across regions within the country. This contrasts with the significantly higher levels of gene-flow found in Australia and the United States. We suggest that the limited movement of beetles across Turkey may be due to a combination of the historically localised agricultural practices (which limits anthropogenic movement among regions), and the mountainous landscape (which limits active flight among regions). Our results demonstrate that the movement of stored product pests may differ significantly across studies conducted in different countries. As a consequence, phosphine resistance management strategies must incorporate region specific information on the extent of beetle movement.

Item Type:Article
Business groups:Crop and Food Science
Keywords:Cytochrome oxidase I Genetic diversity Microsatellites Phosphine resistance
Subjects:Plant culture > Field crops > Grain. Cereals
Plant pests and diseases
Plant pests and diseases > Economic entomology
Plant pests and diseases > Pest control and treatment of diseases. Plant protection
Deposited On:01 Jun 2020 06:02
Last Modified:01 Jun 2020 06:02

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