leaf rust resistance

The Swiss winter bread wheat cultivar "Forno" has been showing near immune levels of leaf rust resistance since its release in 1986. At least six different loci contribute to this phenotype (1). The largest fraction of the phenotipic variation (33-43%) is explained by Lr34. Regretfully, this gene is associated with leaf tip necrosis, an undesirable trait in Western Europe breeding programs. The same authors determined that the second largest source of variation (28–32%) was due to a loci on chromosome arm 1BS, named QLr.sfr-1BS (1).

Contributed by Sybil Herrera-Foessel, Ravi Singh and Evans Lagudah

Triticum speltoides Taush (2n = 14, S genome) is an attractive source of high levels of resistance to leaf, stem and stripe rust of wheat (1). Leaf rust resistance genes Lr28, Lr35, Lr36,and Lr47 were derived from this species (3). Crosses between T. speltoides and hexaploid wheat (T. aestivum L.

Contributed by Gina Brown-Guedira and Suhkwinder Singh

The leaf rust resistance gene Lr47 confers resistance to a wide spectrum of leaf rust strains. This gene was transferred from chromosome 7S of Triticum speltoides to chromosome 7A of Triticum aestivum. Initially, the RFLP locus Xabc465 was used to follow the transfer of the segment containing Lr47 (1), but later, this marker was converted into a dominant PCR marker.

We acknowledge valuable contributions made by Gina Brown-Guedira during the preparation of this page.

Contributed by Marcelo A. Soria, Wenjun Zhang and Jorge Dubcovsky. KASP marker contributed by Gina Brown-Guedira. We also acknowledge valuable contributions by Harbans Bariana, Manilal William, Beat Keller, Evans Lagudah and Bob McIntosh.

Contributed by Gina Brown-Guedira and Suhkwinder Singh

Contributed by C. Hiebert

Contributed by J. Douglas Procunier. Agriculture & AgriFood Canada