The Aegilops ventricosa segment on chromosome 2AS of the wheat cultivar 'VPM1' carries the cereal cyst nematode resistance gene Cre5

Previous studies showed that the intermediate lever of resistance in bread wheat line 'VPM1' to pathotype Ha12 of the cereal cyst nematode could be co nferred by an Aegilops ventricosa-derived gene, CreX, in chromosome arm 2AS , which also carries the rust resistance genes Yr17, Lr37 and Sr38. Near is ogenic lines (NILs) differing for the presence and absence of the Ae. ventr icosa-derived linked genes Yr17/Lr37/Sr38 were tested with cereal cyst nema tode. Lines carrying Yr17 produced significantly fewer nematode cysts than the controls. An infested soil experiment produced better differentiation a mong resistant and susceptible genotypes. Susceptibility of 'Trident' indic ated that linkage between CreX and Yr17 is incomplete. Microsatellite marke rs did not differentiate between 'Trident' and CreX-carrying genotypes. How ever, Xgwm636 (104) was associated with the presence of Yr17 in all six gen etic backgrounds. Since none of the reported cereal cyst nematode resistanc e genes is located in chromosome 2AS, CreX was designated as Cre5.