Septoria and Stagonospora Diseases of Cereals - CIMMYT ...

Another set of resistant lines
was created by the wheat
germplasm enhancement
section. The S. tritici resistance of
lines from Brazil (IAS 20, Pelotas
Arthur, Colotana, IAS 58, and
Maringa), which are tall and
late-maturing with weak straw,
was incorporated into earlymaturing,
high yielding
semidwarf lines. Thus earlymaturing,
short, high yielding
lines were developed that had a
level of resistance similar to that
of the original resistant parent
(Table 3).
Bread wheat lines were also
crossed with triticale, and the
resulting lines showed high
levels of S. tritici resistance
(Table 4). Subsequently, some of
the lines listed in Table 3 were
combined with triticale-derived
lines (Table 5) in an attempt to
pyramid several resistance
genes.
CIMMYT’s wheat wide
crosses program has generated a
wide range of resistant
germplasm from D genome
synthetics and their synthetic
derivatives (Mujeeb-Kazi et al.,
1996; 1998; 1999). These
materials express high levels of
resistance to several leaf
pathogens, including Bipolaris
sorokiniana, Pyrenophora triticirepentis,
and S. tritici. Their
resistance may be to one or a
combination of these pathogens.
Table 6 shows a group of
representative synthetic wheats
with high levels of resistance to
S. tritici.
Septoria tritici Resistance Sources and Breeding Progress at CIMMYT, 1970-99 135
Table 1. Main sources of Septoria tritici resistance used by the CIMMYT wheat breeding
program in the 1970s.
Ex-USSR Southern Cone of SA USA spring Other
winter wheat spring wheat wheat sources
Aurora IAS 55 Chris Enkoy
Kavkaz IAS 58 Era Salomoni Seafoam
Bezostaja 1 PF 70254 Frontana-Kenya Kvz/K4500 L.6A.6
Maringa x Newthatch
Carazinho
IAS 63
Lagoa Vermelha
Tizano Pinto Precoz
IAS 62
CTN 7
CTN 8
Gaboto
IAS 20
Table 2. CIMMYT-derived lines with acceptable Septoria tritici resistance from the ex-USSR,
USA, France, Brazil, Chile, and Romania.
Advanced line Pedigree cross Number S. tritici score a Origin
Veery Kvz/Buho//Kal/Bb CM 33027 76-86 Ex-USSR
Bobwhite Au//Kal/Bb/3/Wop CM 33203 32-76 Ex-USSR
Musala Lee/Kvz/3/Cc//Ron/Cha CM16780 Ex-USSR
Sunbird Gll/Cuc//Kvz/Sx CM34630 42-77 Ex-USSR
Milan VS73.600/Mirlo/3/ CM75113 21-74 France/Ex
Bow//Ye/Trf USSR
Attila ND/VG9144//Kal/Bb/ CM85836 73-76 USA/Ex-
3/Yaco/4/Veery USSR
Bagula Ore F1 158/Fdl// CM59123 53-75 USA/Romania
Mfn/2*Tiba63/3/Coc
/4/Bb/GLl//Carp/3/Pvn
Prinia Prl/Vee#6/Myna/Vul CM90722 74-76 Ex-USSR
Chilero 4777*2//Fkn/Gb54/3/ CM66684 74-76 Ex-USSR
Vee#5/4/Buc/Pvn
Corydon Car 853/Coc/Vee/3/ CM81074 41-75 Chile/ Brazil/
E7408/Pam//Hork/PF73226 Ex - USSR
Tinamu IAS58/4/Kal/Bb// CM81812 32-75 Brazil/Ex-
Cjm71/Ald/5/Au// USSR
Kal/Bb/3/Wop
a Double digit scale (Saari and Prescott, 1975; Eyal et al., 1987) indicating the range of damage during two
screening cycles in Toluca.
Table 3. Short, early-maturing, Septoria tritici resistant lines derived from tall, late-maturing,
resistant Brazilian varieties, with a resistance similar to that of the original resistant parents.
Lines Cross number S. tritici score a
IAS 20/H567.71//4*IAS 20 CMH 79.243 35-52
IAS 20/H567.71//IAS 20/3/IAS 58 CMH 78.390 31-42
IAS 20/H567.71//IAS20/3/3*MRNG CMH 78.443 32-63
CLT/H471.71A//4*CLT CMH 83.2277 32-53
H.567.71/3*P.Ar CMH 77.308 32-74
IAS 20 – 11-62
IAS 58 – 31-54
Maringa – 31-54
Colotona – 11-51
Pelotas Arthur – 21-71
a Double digit scale (Saari and Prescott, 1975; Eyal et al., 1987) indicating the range of damage during two
screening cycles in Toluca.