Susceptibility to Ug99

1
Susceptibility to Ug99
Results from 2006 Kenya Country R ICARDA-WANA 9
Egypt 2 Iran 2 Pakistan 8 Nepal 2 India
9 Bangladesh 6 Kazakhstan 2
Wheat consumption per capita185kg (? 400lb)
2
Spring wheat reaction to TTKS (based on seedling
tests)
US spring wheat CVs of Northern Great Plains
released after 1996 All susceptible to TTKS
except Ivan, Keene, Banton, Ember. All, except
Ember, susceptible to TTKSSr24v (TTKST).
Resistance to 06
nursery Entries TTKSK TTKST Gene URN 32 2 0 Sr24 W
SW 20 0 0 URSN 26 7 3 Sr24, Tha(abc)
3
Genes effective against Ug99
4
Genes effective against Ug99 in adapted US
germplasm
Sr2 -- Selkirk, Scott 66, Eagle Tha(abc) -- AC
Barrie, Verde? Chris, Thatcher Tmp -- Hard red
winter Millennium, Riper, etc 1A.1R -- Hard
red winter TAM107, TAM200 Sr24 -- All
classes Sr36 -- Soft red winer Sisson, USG
3209, etc Sr25 -- a few breeding lines
5
Stem Rust Resistance on 1RS
1RSk--Kavkaz (1BL.1RSk from Petkus rye,
Sr31) 1RSk--Pavon 76 (1AL.1RSk)--Pavon-RS 1RSa--
Amigo (1AL.1RSa from Insave rye) Is Sr
resistance on 1RSa the same as 1RSk?
6
Stem Rust Resistance on 1RS
1RS genotype TTTT TTKS TDTT Kavkaz (1RSk)
1 4 1 Pavon-RS (1RSk) 1 3 1 TAM 107
(1RSa) 1 2 3 Nekota-RS (1RSa) 2 2 3
Stem rust resistance on 1RSa is different from
Sr31 Are they allelic? Can we develop
recombinant with Sr resistance from both?
7
Stem Rust Resistance on 1RS
Cross Gen. TTTT TTKS Pavon-RS (1RSk) X
CS F2 131R/38S 120S Nekota-RS (1RSn) X CS F2
88R/30S 83R/31S 1RSk X 1RSn F2
768R - (1RSk X 1RSn) X CS TC1F1 180R
TC1F1 114R/1S
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Identifying recombinant of 1RS resistance
TC1F2 of (1RSk X 1RSn) X CS Eliminate
resistance of 1RSk by testing with
TTKS Eliminate resistance of 1RSn by testing
with TDTT Recombinant with resistance to TTKS
and TDTT