210
The FHB reaction of line TC67 is shown in Table 8.7 , compared to three check
cultivars with highly tolerant (Sumai3), partially tolerant (HY644), and susceptible
(Roblin) reactions. As shown in Table 8.7 the reaction of TC67 to four parameters
of FHB evaluation was slightly lower than Sumai3, but exceeded the other two
checks. Compared to Sumai3, TC67 had somewhat higher values for Incidence and
Severity and FDK. One of the most important factors in FHB resistance is the DON
content of the grain following inoculation. For this parameter, the values for TC67
at 7.7 ppm are only slightly higher than Sumai3 at 6.6 ppm. In order to map the
resistance of TC67, it was crossed to AC Brio a susceptible cultivar and a mapping
population of 235 lines were produced by SSD (single seed descent). This popula-
tion was grown in replicated trails in fi eld plots at two locations for two seasons plus
replicated trails in greenhouses. A major QTL for resistance was mapped on chro-
mosome 5A (Malihipour et al. 2015 ).
8.4 Triticum macha (AABBDD Genome)
There are not many reports of variability for disease resistance in T. macha. Two
reports were found describing FHB resistance in that species. In one report (Steed
et al. 2005 ), type I FHB resistance was mapped to the short arm of chromosome 4A.
Table 8.6 Stem rust resistance genes from T. timopheevii
Gene SourceChromosome
location Reference
Sr36 ( SrTt1 ) T. timopheevii 2B McIntosh ( 1988 )
Sr37 ( SrTt2 ) T. timopheevii 4B McIntosh and Gyarfas ( 1971 )
SrTt3 T. timopheevii 2B Gyarfas ( 1978 )
CI12632 (W1656) T. timopheevii 2B Nyquist ( 1957 )
Linew (W3563) T. timopheevii Nyquist ( 1957 )
CI13005 T. timopheevii Atkins ( 1967 )
T. timopheevii Watson and Luig ( 1958 )
CI12632 T. timopheevii Allard and Shands ( 1954 )
CI12633 T. timopheevii Allard and Shands ( 1954 )Table 8.7 Means of Fusarium head blight (FHB) incidence, FHB severity, Fusarium-damaged
kernels (FDK) and deoxynivalenol (DON) for three spring wheat checks and the line TC67
(derived from T. timopheevii ) in the fi eld FHB nursery
Line Incidence (%) Severity (%) FDK (%) DON (mgL −1 )
Sumai3 14.4 6.3 9.5 6.6
HY644 43.6 20.0 35.1 25.3
Roblin 90.7 81.9 66.1 35.0
TC67 29.4 16.9 14.5 7.7G. Fedak