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Rac/Rop proteins play important roles in the regulation of cell growth and plant defense responses. However, the function of Rac/Rop proteins in wheat remains largely unknown. In this study, a small G protein gene, designated as  TaRac6 , was characterized from wheat ( Triticum aestivum ) in response to  Puccinia striiformis  f. sp.  tritici  ( Pst ) and was found to be highly homologous to the Rac proteins identified in other plant species. Transient expression analyses of the TaRac6-GFP fusion protein in  Nicotiana benthamiana  leaves showed that TaRac6 was localized in the whole cell. Furthermore, transient expression of TaRac6 inhibited Bax-triggered plant cell death (PCD) in  N. benthamiana . Transcript accumulation of  TaRac6  was increased at 24 h post-inoculation (hpi) in the compatible interaction between wheat and  Pst , while it was not induced in an incompatible interaction. More importantly, silencing of  TaRac6  by virus induced gene silencing (VIGS) enhanced the resistance of wheat (Suwon 11) to  Pst  (CYR31) by producing fewer uredinia. Histological observations revealed that the hypha growth of  Pst  was markedly inhibited along with more H 2 O 2  generated in the  TaRac6 -silenced leaves in response to  Pst . Moreover, transcript levels of  TaCAT  were significantly down-regulated, while those of  TaSOD  and  TaNOX  were significantly up-regulated. These results suggest that  TaRac6  functions as a potential susceptibility factor, which negatively regulate the reactive oxygen species (ROS) burst in the wheat– Pst  interaction.

TaRac6 Is a Potential Susceptibility Factor by Regulating the ROS Burst Negatively in the Wheat–Puccinia striiformis f. sp. tritici Interaction