English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The lesser grain borer  Rhyzopertha dominica  (F.) is one of the most destructive insect pests of stored grain. This pest has been controlled successfully by fumigation with phosphine for the last several decades, though strong resistance to phosphine in many countries has raised concern about the long term usefulness of this control method. Previous genetic analysis of strongly resistant (SR)  R. dominica  from three widely geographically dispersed regions of Australia, Queensland (SR QLD ), New South Wales (SR NSW ) and South Australia (SR SA ), revealed a resistance allele in the  rph1  gene in all three strains. The present study confirms that the  rph1  gene contributes to resistance in a fourth strongly resistant strain, SR2 QLD , also from Queensland. The previously described  rph2  gene, which interacts synergistically with  rph1  gene, confers strong resistance on SR QLD  and SR NSW . We now provide strong circumstantial evidence that weak alleles of  rph2 , together with  rph1 , contribute to the strong resistance phenotypes of SR SA  and SR2 QLD . To test the notion that  rph1  and  rph2  are solely responsible for the strong resistance phenotype of all resistant  R. dominica , we created a strain derived by hybridising the four strongly resistant lines. Following repeated selection for survival at extreme rates of phosphine exposure, we found only slightly enhanced resistance. This suggests that a single sequence of genetic changes was responsible for the development of resistance in these insects.

The rph2 Gene Is Responsible for High Level Resistance to Phosphine in Independent Field Strains of Rhyzopertha dominica