Diseases Which Challenge Global Wheat Production—the Wheat Rusts - Wheat Science and Trade - page 93

Table 5.1 US wheat cultivars tested for the presence of csLV34 alleles and Lr34 .

Class Cultivar csLV34 a Lr34 b Class Cultivar csLV34 Lr34

Soft red winter Fultz − Hard red spring Thatcher − −

Monon − Chris +

− +

Knox62 Era +

Arthur − Waldron −

Caldwell − − Marshall +

CK 9663 − − Wheaton + +

− −

Pioneer 26R61 Butte 86 -

Saluda − Grandin + +

McCormick − Norm + +

NC Neuse − Russ -

Pocahontas − Oxen +

− −

SS550 BacUp

Keene −

HJ98 −

Hard red winter Triumph −

Reeder −

Bison −

Alsen + +

−

Scout 66

Briggs + +

Siouxland −

Steele −

Victory −

Oklee +

Sturdy + +

Glenn −

Ogallala +

Pacifi c Northwest spring wheat Alpowa −

Duster +

Alturas −

Santa Fe c +

Hank -

Fuller c +

Hyak −

2137 −

Jefferson −

Overley −

Madsen −

Deliver +

Nick −

Endurance −

Scarlet −

Cutter −

Stephens −

TAM 107 −

Source: Adapted from Kolmer et al. (2008).
a

+ = allele associated with Lr34 ; − = allele associated with lack of Lr34 .

b
+ Lr34 not present; blank indicates not tested.

c Winter wheat cultivars derived from 'Jagger' may lack Lr34 yet have the csLV34 allele associated with Lr34 .

= genetic analysis indicated presence of Lr34 ; − =

red winter wheat (Table 5.1). The allele associ-
ated with Lr34 was most common in spring wheat
cultivars bred for the northern Great Plains, was
present at low frequency in older and current
hard red winter wheat cultivars, and was not
present in cultivars from the Pacifi c Northwest.
The CIMMYT cultivar Pavon 76 has provided
an additional source of nonspecifi c adult-plant
leaf rust resistance. The adult-plant resistance
gene Lr46 in Pavon 76 is on chromosome 1BL
(Singh et al., 1998). Gene Lr46 is likely present
in CIMMYT germplasm that has been selected
for adult-plant resistance to leaf rust. Cultivars
and germplasm with combinations of Lr34 , Lr46 ,

and additional adult-plant resistance can be highly
resistant, approaching complete immunity (Singh
et al., 2000). Development of diagnostic molecu-
lar markers associated with Lr46 (Rosewarne et
al., 2006) will aid in selection of lines with this
adult-plant resistance.
Combinations of adult-plant resistance genes
with Lr genes effective in seedlings can also
provide good levels of durable leaf rust resistance.
The Minnesota spring wheat cultivar Norm
released in 1992 has remained highly resistant to
leaf rust. Norm was determined to have genes
Lr1 , Lr10 , Lr13 , Lr16 , Lr23 , and Lr34 (Oelke and
Kolmer 2005). Genes Lr1 , Lr10 , and Lr13 are