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Background  Plants have developed a variety of mechanisms to counteract aphid attacks. They activate their defences by changing the expression of specific genes. Previously we identified an activation tag mutant of  Arabidopsis thaliana  on which  Myzus persicae  population development was reduced. Activation tag mutants are gain-of-function in which the expression of a gene is increased by the insertion of the  Cauliflower mosaic virus  35S enhancer that acts on the natural promoter. By further characterizing this previously identified mutant we identified a gene that reduces performance of  M. persicae  and also provided clues about the mechanism involved.    Results  We show that  SKU5 SIMILAR 13  ( SKS13 ), a gene whose expression in wild type plants is restricted to pollen and non-responsive to  M. persicae  attack, is overexpressed in the  A. thaliana  mutant showing reduced performance of  M. persicae . Monitoring  M. persicae  feeding behaviour on  SKS13  overexpressing plants indicated that  M. persicae  have difficulties feeding from the phloem. The constitutive expression of  SKS13  results in accumulation of reactive oxygen species, which is possibly regulated through the jasmonic acid pathway. The enhanced resistance is not aphid species specific as also the population development of  Brevicoryne brassicae  was affected .Conclusions  We demonstrate that constitutive expression in leaves of the pollen-specific gene  SKS13  can enhance plant defence, resulting in a reduction of  M. persicae  population development and also decreases the transmission of persistent viruses. Overexpression of  SKS13  in  A. thaliana  also affects  B. brassicae  and possibly other phloem feeding insects as well. Identifying genes that can enhance plant defence against insects will be important to open up new avenues for the development of insect resistant crop plants.

Constitutive overexpression of the pollen specific gene SKS13 in leaves reduces aphid performance on Arabidopsis thaliana