Monogenic Inheritance of Resistance to Septoria Tritici Blotch in Durum Wheat 'Agili'

摘要

Full resistance to Septoria tritici blotch caused by the fungus Mycosphaerella graminicola and its genetic inheritance has rarely been described in durum wheat. A high level resistance to a virulent Tunisian isolate 'Tun6' has been detected in an oldlocal durum wheat cultivar 'Agili'. High yielding but susceptible durum wheat cultivars. 'Karim' and 'Khiar' were crossed with the resistant 'Agili'. In both F_2 populations, a 3: 1 (resistant: susceptible) segregation was observed after inoculation in the field with the isolate 'Tun6' at the seedling and adult stages, indicating that resistance is controlled by a single dominant gene. This genetic analysis was confirmed by F_2-derived F_3 families segregation of 1: 2: 1 (homozygous resistant: segregati