부산대학교 도서관

Leaf rust is the one of the most important biotic stresses affecting world wheat production because of its wide distribution. In a study conducted to understand the inheritance of leaf rust resistance genes present in the popular durum wheat cultivars viz. HI 8498, HI 8663, HI 8713 and HI 8737 indicated that a single dominant gene each controls resistance to two Puccinia triticina (Pt) pathotypes 162-2 (93R39) and 104-2 (21R55). The allelic tests indicated that three diverse genes control resistance to Pt pathotype 104-2, with the gene being common between HI 8713 and HI 8737. Resistance to pathotype 162-2 was controlled by two diverse genes among the four test cultivars as the same gene conditioned resistance in HI 8737, HI 8713 and HI 8663 with the resistance gene in HI 8498 being different. The infection types of the two Pt pathotypes on the test cultivars were found to be higher than that of near isogenic lines carrying Lr3, Lr14a and Lr23 indicating that the identified genes in the present study were different from these commonly postulated Lr genes in Indian durum germplasm. The identified leaf rust resistance genes in the study will contribute to the diversity of leaf rust resistance in durum wheat and can be well utilized in breeding programmes.