Stem rust, caused by Puccinia graminis Pers.:Pers.f.sp.tritici Eriks.& E.Henn.(Pgt), is a destructive wheat disease and has the potential to cause significant yield losses (Olivera et al., 2015;Soko et al., 2018).The emergence of Pgt race TTKSK, virulent to the widely deployed stem rust resistance gene Sr31 and originally named as isolate Pgt-Ug99 (Pretorius et al., 2000), emphasized the threat of stem rust to global wheat production (Singh et al.,2011).Since the first detection of TTKSK, 13 variants of the Ug99 race group have been discovered in 13 countries, underlining the ability of Pgt to adapt and spread (https://rusttracker.cimmyt.org/?page_id=22;Patpour et al., 2016).It is urgent to find and deploy new Sr genes to cope with the threat of the Ug99 race group for food security.