# Presentation: 497483

## Susceptibility to Ug99

**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 capita*:185kg ( 400lb)

## 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 TTKS+Sr24v (TTKST).

- 		             	     Resistance to
- 06 nursery	Entries	TTKSK	TTKST	Gene
- URN	32	2	0	Sr24
- WSW	20	0	0
- URSN	26	7	3	Sr24, Tha(abc)

## Genes effective against Ug99 

| Line | Sr gene | Seedling IT | 2005 Kenya | 2006 Kenya |
| --- | --- | --- | --- | --- |
| Combination VII     | 13(+17) | 2+ | 40 MR-MS | 40 MS |
| Sr22TB     | 22 | 1; | 10 R | 20 R-MR |
| LcSr24Ag | 24 | 2 | 10 MR | 20 R-MR, 5 S |
| Sr25/9*LMPG | 25 | 2 |  | 20 MR-MS |
| Sr26/9*LMPG  | 26 | 1 |  | 10 R |
| Sr27/9*LMPG | 27 | ; | 20 MR | 10 R |
| W2691/Sr28Kt | 28 | ;13 | 40 MS-S | 30 MR-MS |
| CnsSr32 A.s.  | 32 | 1+ | 30 R | 10 R |
| RL 5405 | 33 | 2,3 | 30 MR | 30 MR-MS |
| Mq(2)5*G2919 | 35 | ; | 10 MR-MS | 1 R |
| W2691SrTt-1 | 36 | 0 | 0 | 0 |
| W3563 | 37 | ;1- |  | 5 R/60 S |
| RL 6082 | 39 | ;1 | 5 R/70 S | 5 R/10 MS |
| RL 6088 | 40 | 1 | 5 R | 10 R |
| Taf-2 | 44 | 1+ | 10 R-MR | 10 R |
| CnsSrTmp | Tmp | 2+ | 40 MS | 30 MR-MS |

## 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**

## Stem Rust Resistance on 1RS

**1RS****k****--Kavkaz (1BL.1RS****k**** from Petkus rye, *****Sr31*****)**
**1RS****k****--Pavon 76 (1AL.1RS****k****)--Pavon-RS**
**1RS****a****--Amigo (1AL.1RS****a**** from Insave rye)**
**Is Sr resistance on 1RS****a**** the same as 1RS****k****?**

## Stem Rust Resistance on 1RS

_**1RS genotype**__**	**__**TTTT**__**	**__**TTKS**__**	**__**TDTT**__**	**_
**Kavkaz (1RS****k****) ****	****1****	****4****	****1;**
**Pavon-RS (1RS****k****)****	****1****	****3+****	****1**
**TAM 107 (1RS****a****)****	****1+****	****2+****	****3**
**Nekota-RS (1RS****a****)****	****2+****	****2+****	****3+**

**Stem rust resistance on***** *****1RS****a**** is different from Sr31**
**Are they allelic? **
**Can we develop recombinant with Sr resistance from both?**

## 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**

## 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