Fig. 6

A proposed working model for FHB resistance conferred by the barley 2Hb8 QTL. Note the higher expression of defense-related genes in the 2Hb8 R NIL when compared to M69 during the mock treatment and within 48 h after F. graminearum infection. Asterisks indicate that the transcripts also accumulated higher in the 6Hb7 R NIL compared to Lacey after fungal infection at 48 h. Arrows indicate positive interaction. Perpendicular lines indicate negative interaction. Red color indicates virulence factor or signals derived from from F. graminearum. LAC, laccase; CESA, cellulose synthase; ROS, reactive oxygen species; NPR1, nonexpressor of PR genes 1; DIR1, defective in induced resistance 1; PR, pathogenesis-related; LOX, lipoxygenase; GLIP, GDSL lipase; PM, plasma membrane. See text for other abbreviations