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ARS Home » Southeast Area » Stoneville, Mississippi » Crop Genetics Research » Research » Publications at this Location » Publication #341626
Research Project: Genetics and Management of Newly Emerging Soybean Cyst Nematodes and Predominant Fungal Diseases for Sustainable Soybean Production

Location: Crop Genetics Research

Title: Genetically diverse soybean cyst nematode-resistant full-sib soybean germplasm lines AR4SCN, AR5SCN, AR6SCN, AR7SCN, and AR8SCN

Author
item CIANZIO, SILVIA - Iowa State University
item Arelli, Prakash
item SWAMINATHAN, SIVAKUMAR - Iowa State University
item LUNDEEN, PETER - Iowa State University
item GREBHART, GREGORY - Iowa State University
item RIVERA-VELEZ, NIEVES - Iowa State University
item GUILHERME, SCHEILA - Universidade Federal De Lavras
item DIERS, BRIAN - University Of Illinois
item WESTGATE, MARK - Iowa State University

Submitted to: Journal of Plant Registrations
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 9/22/2017
Publication Date: 1/18/2018
Publication URL: https://handle.nal.usda.gov/10113/6472352
Citation: Cianzio, S.R., Arelli, P.R., Swaminathan, S., Lundeen, P., Grebhart, G.D., Rivera-Velez, N., Guilherme, S.R., Diers, B., Westgate, M.E. 2018. Genetically diverse soybean cyst nematode-resistant full-sib soybean germplasm lines AR4SCN, AR5SCN, AR6SCN, AR7SCN, and AR8SCN. Journal of Plant Registrations. 12:124-131. https://doi.org/10.3198/jpr2017.03.0015crg.
DOI: https://doi.org/10.3198/jpr2017.03.0015crg

Interpretive Summary: Soybean yields worldwide are limited by the soybean cyst nematode, a microscopic size roundworm attaching to the roots of the plant. Annual yield losses in the U.S. exceed one billion dollars. Resistant cultivars have been the most effective means of controlling the nematodes. However, nematode populations are genetically highly variable and over time will adapt to reproduce on resistant cultivars. Currently, over 95% of soybean cultivars with SCN resistance planted in the northern U.S. have derived their resistance from one genetic source: PI88788. This is a major challenge to breeders. It is essential to identify new sources of resistance or strengthen the existing source for more durable resistance. We have identified a diversified source of SCN resistance, soybean PI22897 (Columbia), with similar reaction from exotic collection. We combined resistance through traditional crossing of soybean line PI88788 with PI22897 and selected four different groups of soybean populations. There were selected based upon desirable agronomic traits and having resistance to Race 2 nematode population. All four soybean populations (ARSCN5, ARSCN6, ARSCN7, ARSCN8) have yielded similar to check cultivars Dwight and Macon. These soybean populations may be used as source materials for developing new resistant cultivars for more durable resistance potentially may minimize shifting of nematode populations in the field under continuous soybean planting. Soybean growers will be the ultimate beneficiaries.

Technical Abstract: Primarily, soybean (Glycine max (L.) Merr.) yields are protected from pathogens through breeding for pathogen-resistance. The germplasms AR4SCN (Reg. No. ), AR5SCN (Reg. No. ), AR6SCN (Reg. No. ), AR7SCN (Reg. No. ), and AR8SCN (Reg. No. ), are soybean cyst nematode (SCN, Heterodera glycines Ichinohe) resistant lines to SCN Races 3 (HG Type 0), and 14 (HG Type 1.3.6. 7). Iowa State University (ISU) Projects 3722- Agronomy Department, and 3384-Plant Pathology Department, the Iowa Agricultural and Home Economics Experiment Station (IAHEES), and the ISU Research Foundation (ISURF) have developed these germplasms using combined technologies of traditional breeding and molecular markers and the lines were released. Each germplasm line is an F 12:13 bulk of 60 agronomic uniform individual plants from a bi-parental cross, PI 88788 x ‘Columbia’, both parents resistant to SCN and are genetically diverse. The crosses were made at the Isabela Substation, Puerto Rico, underwent generation advances in Puerto Rico, IA, and IL. Phenotyping and molecular characterizations were done at Arelli and Cianzio labs, confirming the presence of two major QTLs (rhg1, and Rhg4), inherited from each of the two parents, resulting in high SCN resistance. Average seed yield of AR4SCN, Maturity Group (MG) II was 57% of the check cultivar ‘Dwight’. Average seed yield of MG III lines (ARSCN5, ARSCN6, ARSCN7 and ARSCN8) was 77% of the check cultivar ‘Macon’. The germplasms will serve to develop SCN-resistant genotypes for improved resisitance, adapted to the Northern US production regions in which SCN, HG Type 0 and Type 1.3.6.7 may be most prevalent. They may also serve as research genetic stocks for soybean breeders.