250
10.3.2 Resistance to Septoria Tritici Blotch
( Mycosphaerella graminicola )
The analysis of different sets of single chromosome substitution lines, including
those derived from the ‘CS’ x ‘Synthetic 6x’ identifi ed chromosome 7D of the syn-
thetic wheat to carry a gene(s) encoding near complete resistance to two virulent
Argentinian isolates of the foliar fungal disease septoria tritici blotch, caused by the
pathogen Mycosphaerella graminicola (Fuckel) Schroeter in Cohn (Simón et al.
2001 , 2005 ). In subsequent studies, Simón et al. ( 2007 ) explored the 13 chromo-
some 7D introgression lines, along with the parental lines ‘CS’ and ‘CS (Syn 7D)’.
Both seedling and adult plant disease tests were performed by inoculation with the
two isolates ‘IPO 92067’ and ‘IPO 93014’, which had been selected on the basis of
prior observations made of their reactions in the ‘CS (Syn)’ single chromosome
substitution lines.
Results are presented in Fig. 10.3. The introgression lines differed signifi cantly
in disease reaction from ‘CS’ in at least two (grey vertical bars) or four (black
Fig. 10.3 Wheat/ Ae. tauschii chromosome 7D introgression lines inoculated with septoria tritici
blotch isolates IPO 92067 and IPO 93014 at the seedling and adult plant stages. Lines differing
signifi cantly from CS in two and four independent experiments are indicated by, respectively, grey
and black colour. Boxes in broken lines indicate the position of the resistance locus. c centromere
position, L long arm, S short arm (Simón et al. 2007 )
A. Börner et al.