Resistance to Multiple Soil-Borne Pathogens of the Pacific Northwest, USA Is Colocated in a Wheat Recombinant Inbred Line Population.
Soil-borne pathogens of the Pacific Northwest decrease yields in both spring and winter wheat. Pathogens of economic importance includeFusarium culmorum,Pratylenchus neglectus,P. thornei, andRhizoctonia solaniAG8. Few options are available to growers to manage these pathogens and reduce yield loss, therefore the focus for breeding programs is on developing resistant wheat cultivars. A recombinant inbred line population, LouAu (MP-7, NSL 511036), was developed to identify quantitative trait loci (QTL) associated with resistance toP. neglectusandP. thorneiThis same population was later suspected to be resistant toF. culmorumandR. solaniAG8. This study confirms partial resistance toF. culmorumandR. solaniAG8 is present in this population. Six major and 16 speculative QTL were identified across seven measured traits. Four of the six major QTL were found within the same genomic region of the 5A wheat chromosome suggesting shared gene(s) contribute to the resistance. These QTL will be useful in breeding programs looking to incorporate resistance to soil-borne pathogens in wheat cultivars.
Plant Physiology and Genetics Research Unit, United States Department of Agriculture-Agricultural Research Service, Maricopa, Arizona 85138 alison.thompson@ars.usda.gov.
Alison L
AL
Thompson
Department of Plant Pathology, Washington State University, Pullman, Washington 99164.
Aaron K
AK
Mahoney
Columbia Basin Agricultural Research Center, Oregon State University, Pendleton, Oregon 97801.
Richard W
RW
Smiley
Wheat Health, Genetics and Quality Research Unit, United States Department of Agriculture-Agricultural Research Service, Pullman, Washington 99164.
Timothy C
TC
Paulitz
Department of Plant Pathology, Washington State University, Pullman, Washington 99164.
Scot
S
Hulbert
Wheat Health, Genetics and Quality Research Unit, United States Department of Agriculture-Agricultural Research Service, Pullman, Washington 99164.
Kim
K
Garland-Campbell
D060467:Disease Resistance / Q000235:genetics*; D007178:Inbreeding; D040582:Inheritance Patterns / Q000235:genetics; D015205:Northwestern United States; D010641:Phenotype; D010935:Plant Diseases / Q000382:microbiology*; D040641:Quantitative Trait Loci / Q000235:genetics; D011995:Recombination, Genetic; D012988:Soil Microbiology; D013223:Statistics as Topic; D014908:Triticum / Q000235:genetics* / Q000276:immunology* / Q000382:microbiology
breeding; marker-assisted selection; plant pathology