The Screening of Pakistani Wheat Landraces to Stem Rust (Puccinia gramminis f. sp. tritici) resistance under field conditions.

Abstract

The stem rust diseases of wheat have historically been the major biotic stress responsible for destabilizing production in Asia and other parts of the world .Stem rust has continuously been in surge of destroying wheat genome especially after its race Ug99 that surfaced in Uganda in year 1999 that suppressed vital stem rust resistance gene Sr31.It was the pivotal gene that had immunity to wheat against lethal stem rust fungus.In order to trace genetic resources inside the wheat genome; a set of 112 landraces was evaluated for stem rust resistance under field condition at Jhuddo, a hot spot of stem rust in southern Pakistan. The results indicated that 80% landraces were susceptible to intensity of stem rust at Jhuddo,4% moderately suscesptible,11% moderately resistant while 17%  shown moderetly resistance moderetly susceptible types of reactions according to modified Cobbs Scale.  .