211In another study (Buerstmayr et al. 2011 ) resistance QTL in T. macha were mapped
to chromosomes 2A, 2B, 5A, and 5B. The 5A QTL mapped very tightly to the spelt-
type locus.
8.5 Triticum miguschovae
Triticum miguschovae is a synthetic hexaploid (AAGGDD) derived from crossing T.
militinae Zhuk and Migush ( genome formula A b G) with Aegilops squarossa (Zhirov
1980 ). The amphiploid is stable and fully fertile. It has overly thick outer glumes as
shown in Fig. 8.6 and is diffi cult to thresh. In our screening tests, it was found to
have a degree of resistance to FHB as shown in Fig. 8.6 (Fedak et al. 2011 ). This
resistance is currently being mapped. With backcrossing and selection the resistance
was carried over to BC 2. Resistance to leaf rust at the adult plant stage was detected
in the amphiploid T. miguschovae and transferred to bread wheat (Davoyan and
Ternovskaya 1996 ). The resistance was controlled by a pair of complementary
genes located on chromosomes 7B and 1D. The latter resistance would have come
from Ae. squarrosa and the former from T. militinae. The amphiploid also had resis-
tance to stem rust, yellow rust, and mildew. Powdery mildew resistance was intro-
gressed into bread wheat from T. militinae (Jakobson et al. 2012 ). The QTL
responsible for the resistance were mapped to chromosomes 4AL, 5AL, and 7AL.
The resistance was non race specifi c and effective at seedling and adult plant stages.
Fig. 8.6 Resistance to
Fusarium head blight
expressed on spike of
Triticum miguschovae
(AGD) (R) at 21 days after
inoculation. Roblin (L) is
the susceptible check
8 Alien Introgressions from wild Tr it icu m species, T. monococcum...