تحديد مورثاث المقاومة الفعالة لمرض صدأ الأوراق المتسبب عن الفطر Puccinia recondita f. sp. tritici على محصول القمح في العراق

Abstract EN

The present study was conducted to identify effective genes to leaf rust disease on wheat for deployment in wheat breeding programs in Iraq.

The experiments were carried out with artificial inoculation at Tuwaitha experimental station, Baghdad during six cropping cycles (1995-2000).

Host reaction of a set of differential varieties to the prevalent physiological races of Puccinia recondita Rob ex Desm f.

sp.

tritici were investigated under field conditions.

Results revealed that the prevalent physiological races of P.

recondita did overcome the resistance of most of the known Lr genes and some of the unknown genes present in the differential cultivars, Thatcher, Morocco and Sunbirds.

Meanwhile, the leaf rust resistant genes Lrl2, Lrl5, Lr 17, Lr22a and Lr24 were found to be effective against most of the virulence genes of the pathogen population under the conditions of the middle zone of Iraq.