Genetic analysis of resistance to leaf‐rust (Puccinia reconditaf. sp.tritici) pathotypes in the durum wheats ‘PBW 34’ and ‘DWL 5023’

摘要

AbstractGenetic analysis of leaf‐rust resistance was conducted on two durum wheats.Triticum durumcvs. ‘PBW 34’ and ‘DWL 5023’ were crossed with the leaf‐rust‐susceptible durum wheat ‘Malvi Local’. The F1, F2and F3generations were tested against leaf‐rust pathotypes 1, 77A and 108. In ‘PBW 34’, a single dominant gene was effective against each of the pathotypes 1 and 108, whereas two independently inherited dominant genes were effective against pathotype 77A. In ‘DWL 5023’, two independently inherited dominant genes were operative against pathotypes 1 and 77A, whereas a single dominant gene was identified as being operative against pathotype 108. Allelic tests on F2generation and joint segregation analysis on F3generation seedlings, suggested that two different genes in each cultivar are effective against these three leaf‐rust pathotypes. Cultivar ‘PBW 34’ hasLrd1andLrd2genes whereasLrd1andLr