Physiology of genetic improvements in yield and grain protein of Canadian Western Amber Durum wheat

Two relatively new Canada Western Amber Durum (CWAD) (Triticum turgidum L. var durum) cultivars used different strategies to increase yield and maintain high grain protein relative to older cultivars. AC Navigator (semi-dwarf) increased kernel weight and spikes per plant. AC Avonlea (conventional height) reduced height and increased spike size. AC Avonlea remobilized more nitrogen (N) to the grain than AC Navigator, which could be attributed to its large spike sink.Key words: Triticum turgidum, yield, protein, spike size, nitrogen uptake and remobilization