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TABLE W9. Lines from the Bread Wheat Screening Nursery susceptible in the seedling stage to stem
rust races 15-2,4,7 and 151-1,2,3,5 but resistance in the adult plant stage to the same races. Some of
these may carry general resistance.
S. N.
"B"
Pedigree
Race 15-2,4,7 (Strain # 13-1 )
Seedling
Adult
Race 151-1,2,3,5 (Strain # 64)
Seedling
Adult
647
661
666
681
698
711
712
719
728
745
779
781
786
832
885
949
987
999
1022
1073
1077
CIANO·7 Cerros x Tobari-CIANO
25863·39V·7M·l V·OM
INIA x CIANO
26475·43V·4M·2V-OM
Son. 64-KI. Rend. x Bluebird
26502-8V-2M·2V·OM
Tob. 66-Np. 832
26896·12V·2M·l V-OM
Tob. 66 x CIANO "5"
2490a·17M·l V-I M-l V-OM
CIANO "5" x Tob. 66
24989·2M-2V·2M·l V-OM
CIANO "5" x Tob. 66
24995-2M·l V·l M-3V-OM
CIAN0 2·Chris
25101·6M·2V·2M-l V-OM
CIANO "5" x Tob. 66
24989-2M-2V·2M·4V-OM
CIANO "5"" x Jar "5"
25124-1 M-l R-2M·1V-OM
Bluebird x Nor. 67
271 OO·60M·1 V·OM
CIANO "5" x Calidad
27129-1 M·l V·OM
CIANO-INIA x Calidad
27224·17M·1 V-OM
Pi 62 x T.r:-Son. 64/CIANO"
26745-66V-1 M-OM
CIANO' x Chris
27341·15M·3V·OM
KI. Rend.·Son. 64" x INIA/CIANO
24970·17M·1T·3M·l V-OM
CIANO-Chris x Bluebird
26558·69V·6M·3V·OM
CIANO".Crespo
24998·18M·4R·4M-2V·OM
CrANO x INIA
25329·1T·7M-OV
CIANO "5" x INIA "5"
23959·52T·1M·3V·OM
CIANO "5" x Son. 64 x KI. Rend.
27824.0V·OM
3+
3
3+
3+
3+
3+
3
3+
3+
3
2+3
3
3
3
4
3
3
4
3+
3+
5·MR
5-MR
5-MR
5-MR
5-MR
5·MR
5·MR
5-MR
5-MR
o
Tr-MR
20-MR
5-MR
o
3
o
o
5-MR
5-MR
5-MR
o
2+3
3-
3+
3
3
3
3
3+
3
3+
3
3+
3+
3+
4
4
3+
3
3+
3
3+
Tr-MR
o
Tr·MR
o
o
o
o
Tr·MR
o
Tr·MR
Tr·MR
o
20-MR
5-MR
o
o
o
Tr MS
o
Tr-MR
20·MR
o
o
o
o
o
.0
o
o
o
o
o
Tr·R
o
o
o
o
o
o
o
o
113-1,3,5,6 (12-1) and 151-1,2,3,5 (64) on
the principal lines currently included in the
Crossing Block and Durum Screening Nursery.
From these experiments the dangers inherent
in the current situation become very apparent.
Many lines that are apparently resistant in the
field are highly susceptible in the seedling
stage to one or more of the races, especially
to race 15-2, 3, 4, 7. On the other hand, some
of the lines from the Crossing Block and·
Screening Nursery combine resistance in both
the seedling and adult stages.
Attempts are now underway to identify
durum lines and varieties which are completely
susceptible in the seedling stage, but carry
genes that condition resistance in the adult
stage. To date, in preliminary tests, five different
lines originating from two different
crosses, have been identified as carrying this
type of resistance (Table W11).
68