REACTION OF TRITORDEUM TO FUSARIUM-CULMORUM AND SEPTORIA-NODORUM

Hordeum chilense is a wild barley extensively used in wide crosses in the Triticeae. It could be a valuable source of resistance to Fusarium culmorum and Septoria nodorum. Some H. chilense x Triticum spp. amphi ploids, named tritordeums, were more resistant than the parental wheat line to these diseases, others were not. Average contents of ergoster ol and deoxynivalenol (DON) suggested that resistance to colonization by Fusarium was the highest for Hordeum chilense, followed by tritorde um and wheat in decreasing order. In particular, the H. chilense genot ypes H7 and H17 enhanced the wheat resistance to F. culmorum in its tr itordeum offsprings. Resistance to S. nodorum in tritordeum was not as sociated with tall plant height. There is sufficient genetic variation for resistance to F. culmorum and S. nodorum among tritordeum to allo w the breeding of lines combining short straw and resistance to both d iseases.