Figure 4.

The cluster of sulphur-rich hordein genes on the short-arm barley chromosome 1 H (left panel) and their corresponding expression profiles during development. For abbreviations, see Figure 2 legend. Expression data from individual replications are given in Additional file 3. In the lower panel, percent crude protein estimated based on seed nitrogen (N%) for the two parents of introgression line population (H.vulgare Brenda and H. spontaneum 584) from control and drought stress treatments is presented.