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ARS Home » Southeast Area » Stoneville, Mississippi » Crop Genetics Research » Research » Publications at this Location » Publication #364424
Research Project: Genetics and Management of Newly Emerging Soybean Cyst Nematodes and Predominant Fungal Diseases for Sustainable Soybean Production

Location: Crop Genetics Research

Title: Registration of IAR1902SCN cultivar resistant to soybean cyst nematode and brown stem rot

Author
item CIANZIO, SILVIA - Iowa State University
item ABOOBUCKER, SIDDIQUE - Iowa State University
item GEBHART, GREGORY - Iowa State University
item SWAMINATHAN, SIVAKUMAR - Iowa State University
item Arelli, Prakash

Submitted to: Journal of Plant Registrations
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 4/16/2019
Publication Date: N/A
Citation: N/A

Interpretive Summary: Soybean is an important crop in the U.S., but yields are reduced when the plant is attacked by pathogens, which include a microscopic worm called soybean cyst nematode (SCN) that feeds on the roots and a soil-borne fungus that causes a disease called brown stem rot (BSR). To combat these diseases, soybean cultivar IAR1902 SCN was developed and released by the Iowa State University Research Foundation (ISURF). This unique cultivar has resistance to both SCN and BSR combined with high yield. Yields averaged from 3585-4315 kg/ha for IAR1902 SCN to check cultivar IA1022, which yielded 3531-4007 kg/ha. IAR1902 SCN is highly adapted to soybean fields in the northern soybean production regions of the U.S. It also has an acceptable level of resistance to soybean sudden death syndrome, another important disease of soybean. The cultivar IAR1902 SCN will serve in production conditions in which SCN is prevalent and BSR may also be a threat. Ultimately, the soybean producers will be the beneficiaries in the U.S. and this cultivar may also serve as source material for seed industries for further improvement of yields in soybean.

Technical Abstract: One objective of the Iowa State University (ISU) soybean breeding program for yield and pathogen resistance is development of high-yielding cultivars with defensive traits. IAR1902SCN, a high yielding cultivar traces soybean cyst nematode (SCN) resistance to Peking. IAR1902SCN developed by ISU Project No. 4403 (Agronomy Department), was released by Iowa State University Research Foundation (ISURF) Docket #04332. Parents are Agripro 97284-N00-47977 x IAR2001 BSR. Crosses and line development occurred in 2005 Puerto Rico. Field yield evaluations were from 2008–2012. SCN resistance was screened from 2006-2012 in greenhouse and field conditions. IAR1902SCN is of maturity group (MG) I similar to IA1022, yielding superior to current SCN resistant public cultivars, being highly resistant to SCN HG type 0, and resistant to HG type 2.5.7., and adapted to 40o – 42o N latitude. Cianzio’s lab confirmed that IAR1902 SCN has the full length sequence repeat of the major Peking-type rhg1 gene. IAR1902SCN is also resistant to brown stem rot (BSR). Molecular analyses confirmed in IAR1902SCN two major BSR resistant QTL, Rbs1 and Rbs3 inherited from IAR2001 BSR. IAR1902SCN has acceptable resistance to iron deficiency chlorosis (IDC), and sudden death syndrome (SDS). IAR1902SCN will grow well in the Northern soybean production region of the U.S. in which SCN is prevalent, and other stress factor such as diseases BSR and SDS, and/or IDC may be present.