2020
Evaluating Soybean Cultivars and Germplasm for Resistance to Soybean Cyst Nematode
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Contributor/Checkoff:
North Dakota Soybean Council
Category:
Sustainable Production
Keywords:
Crop protectionDiseaseField management
Parent Project:
This is the first year of this project.
Lead Principal Investigator:
Guiping Yan, North Dakota State University
Co-Principal Investigators:
Project Code:
QSSB
Contributing Organization (Checkoff):
North Dakota Soybean Council
$34,298
Institution Funded:
North Dakota State University
$34,298
Brief Project Summary:

Cultivar resistance is the primary management tactic for soybean cyst nematode. The shift in SCN populations has led to a decrease in resistance in soybean cultivars derived from PI 88788. Thirty-six out of 37 cultivars and lines showed susceptible or moderately susceptible reactions, and only one cultivar was moderately resistant, indicating it is imperative to screen additional cultivars and germplasm. This project will screen 80 soybean cultivars, germplasm, and breeding lines from USDA-ARS Soybean Germplasm Collection for resistance to common SCN virulent type and the new virulent type detected in North Dakota.

Key Benefactors:
farmers, breeders, agronomists, pathologists

Information And Results
Final Project Results

Update:

View uploaded report Word file

EVALUATING SOYBEAN CULTIVARS AND GERMPLASM FOR RESISTANCE TO SOYBEAN CYST NEMATODE

EXECUTIVE SUMMARY

NORTH DAKOTA SOYBEAN COUNCIL
JUNE 2020

Dr. Guiping Yan, Principal Investigator, Dept. Plant Pathology, NDSU
Co-investigators: Dr. Ted Helms, Dept. Plant Sciences, NDSU and Dr. Sam Markell, Dept. Plant Pathology, NDSU

Research Conducted
Eighty-one soybean lines (germplasm of maturity group 00 to 1, breeding lines, and commercial cultivars) each in four replicates were screened against SCN HG type 2.5.7, and eighty soybean lines (germplasm of maturity group 00 to 1 and commercial cultivars) each in four replicates were screened for SCN HG type 0 isolated from soybean fields in North Dakota. Each plant was inoculated with 2,000 SCN eggs and grown in a growth chamber for 35 days. The female index was calculated for each of the soybean lines by comparing the number of white females (cysts) with that formed on the susceptible soybean Barnes, then categorized for resistance reactions.

Why the research is important to ND soybean farmers
Soybean cyst nematode (SCN; Heterodera glycines) is a major yield-limiting factor of soybean. In 2015 and 2016, a more virulent form (HG type 2.5.7) that reproduced well on PI 88788 was detected in soybean fields in ND. The new forms have higher levels of virulence and are able to overcome the resistance that is commonly used for control. The shift in SCN populations has led to a decrease in resistance in soybean cultivars derived from PI 88788 elsewhere. Hence, it is imperative to screen soybean cultivars and lines for identifying resistance against the new virulent type in ND.

Final findings of the research
Out of 81 soybean germplasm, breeding lines, and commercial cultivars tested for HG type 2.5.7, two lines were resistant, ten were moderately resistant, 27 were moderately susceptible, and 42 were susceptible. For HG type 0, out of 80 lines, one line was resistant, six were moderately resistant, 46 were moderately susceptible, and 27 were susceptible. Therefore, out of all the entries tested, 15% were resistant or moderately resistant to HG type 2.5.7, and 9% were resistant or moderately resistant to HG type 0, but none of them showed resistance to both the populations tested.

Benefits/Recommendations to North Dakota soybean farmers and industry
Three resistant soybean cultivars and lines were identified in this research. The important soybean entries identified will be re-tested to confirm their resistance reaction. The research findings are useful to navigate the use of resistance sources for farmers and the resistance sources that should be introduced to the soybean breeding programs to develop new cultivars with resistance to the common or new SCN virulent population.

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.