Five sets of markers were assessed for their usefulness in breeding, two
linked to wheat stem rust gene Sr2, several markers
linked to a chromosome segment conferring
Yr17/Lr37/Sr38 resistance, two reported markers
for the linked genes Lr35 andSr39,
one for Lr28, and one linked to flour colour. The gene
for Sr2 confers adult plant resistance to stem rust
(Puccinia graminis f.sp. tritici)
and was originally transferred to bread wheat from the tetraploid emmer
(‘Yaroslav’) to the cultivars Hope and H-44. The gene is located
on the short arm of chromosome 3B and confers a durable adult plant resistance
to stem rust usually expressed only in the field. The chromosome segment
carrying the Lr37, Sr38,
Yr17 resistance genes is located on 2AS and was
originally introduced into wheat through an
Aegilops ventricosa
Triticum persicum cross, followed by a cross to the
cultivar Marne (VPM1). The flour colour quantitative trait locus was
originally described in a Yarralinka Schomburg cross and is located on
chromosome 7A. The primers as originally developed required optimisation for
more routine use in a breeding program.
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