2014
Increasing profits through genetic resistance to SDS
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Contributor/Checkoff:
North Central Soybean Research Program
Category:
Sustainable Production
Keywords:
GeneticsGenomics
Parent Project:
This is the first year of this project.
Lead Principal Investigator:
Brian Diers, University of Illinois at Urbana-Champaign
Co-Principal Investigators:
Dechun Wang, Michigan State University
Jason Bond, Southern Illinois University at Carbondale
Osman Radwan, University of Illinois-Carbondale
Glen Hartman, USDA/ARS-University of Illinois
+3 More
Project Code:
Contributing Organization (Checkoff):
North Central Soybean Research Program
(n/a)
Institution Funded:
University of Illinois-Carbondale
(n/a)
Brief Project Summary:

Resistant cultivars are the most effective management option for growers to control sudden death syndrome (SDS). Some cultivars show good resistance to SDS, however, the inheritance of this resistance is complex because it is controlled by many genes. The research in this proposal is focused on improving our understanding of the genetic basis of resistance to SDS, which should help breeders become more efficient in developing new, high yielding SDS resistant cultivars.

Sudden death syndrome is an important disease of soybean and was estimated to cause annual losses averaging 34 million bushels each year from 2006-2010. SDS has recently moved north and has now become a major concern...

Unique Keywords:
#breeding & genetics, #sudden death syndrome (sds)
Information And Results
Project Deliverables

Final Project Results

Three mapping populations with a total of 559 lines developed using the two new resistance sources GD2422 and E07080 were evaluated for SDS resistance reactions in the MSU SDS disease nursery near Decatur, MI. Marker and SDS data from the two GD2422 populations were analyzed and 11 chromosomal regions were found to be associated with SDS resistance.

Previously mapped SDS resistance genes were retested for resistance reactions in populations developed so the genes could be confirmed in uniform genetic backgrounds. These tests confirmed the effect of two of the five genes tested. A third gene was found to be significant for resistance, but the effect of the gene was opposite of predictions, meaning that the resistance allele was associated with more disease than the allele for susceptibility. The confirmed genes will be useful to select in plant breeding programs.

Resistant and susceptible near-isogenic lines (NILs), parents of the NILs, and resistant and susceptible checks were tested in a greenhouse for SDS resistance to verify their resistance reactions. In a third assay, root and leaf tissue from infected and non-infected plants were collected at three time points and tested for gene expression to determine when tissue sampling for gene expression assays should be done. Results from these tests indicate that samples should be taken 6 to 10 days after inoculation with Fusarium virguliforme, the fungus that causes SDS.

The United Soybean Research Retention policy will display final reports with the project once completed but working files will be purged after three years. And financial information after seven years. All pertinent information is in the final report or if you want more information, please contact the project lead at your state soybean organization or principal investigator listed on the project.