Registration of ‘IAR1902 SCN’ Cultivar Resistant to Soybean Cyst Nematode and Brown Stem Rot

Abstract

One of the main objectives of the Iowa State University (ISU) soybean [Glycine max (L.) Merr.] breeding program is to develop high‐yielding cultivars with defensive traits. ‘IAR1902 SCN’ (Reg. no. CV‐533, PI 690449) is a high‐yielding cultivar that traces soybean cyst nematode (SCN) resistance to ‘Peking’. IAR1902 SCN was developed by ISU Project No. 4403 (Agronomy Department) and released by Iowa State University Research Foundation (ISURF) Docket # 04332. The parental lines of IAR1902 SCN are Agripro 97284‐N00‐47977 × ‘IAR2001 BSR’. The material and transfer agreement corresponding to the Agripro parent indicated that the experimental line has the Peking‐type SCN resistance. The IAR2001 BSR parent traces brown stem rot resistance to the cultivar BSR101. Crossing and line development was accomplished in 2005 in Puerto Rico. Field evaluations for yield were performed from 2008 to 2012. Screenings for SCN resistance were performed from 2006 to 2012 in both greenhouse and field conditions. IAR1902 SCN belongs to maturity group (MG) I similar to IA1022 and has yields superior to the current SCN‐resistant public cultivars evaluated in the tests. IAR1902 SCN is highly resistant to SCN Heterodera glycines (HG) type 0 and resistant to HG type 2.5.7., adapted to 40° to 42° N latitude. Cianzio's laboratory confirmed that IAR1902 SCN has the full‐length sequence repeat of three copies of the major Peking‐type rhg1 gene and Peking‐type Rhg4 gene. IAR1902 SCN is also resistant to brown stem rot (BSR). Molecular analyses confirmed that IAR1902 SCN inherited two major BSR resistance quantitative trait loci, Rbs1 and Rbs3, from IAR2001 BSR. IAR1902 SCN has acceptable resistance to iron deficiency chlorosis (IDC) and sudden death syndrome (SDS). IAR1902 SCN will grow well in the northern soybean production region of the United States in which SCN is prevalent and other biotic and abiotic stress factors such as BSR, SDS, and/or IDC may be present.