Registration of three soybean germplasms with novel cyst nematode resistance from PI 567516C

Abstract

AbstractSoybean [Glycine max (L.) Merr.] germplasm lines JTN‐5316 (Reg. no. GP‐443, PI 691524), JTN‐5416 (Reg. no. GP‐444, PI 691525), and JTN‐5516 (Reg. no. GP‐445, PI 691526) were released by the USDA‐ARS in 2019 and trace 25% of their pedigree to PI 567516C. These F6–derived sister lines are the first releases derived from this accession. The new lines were developed to provide broad genetic resistance to the predominant damaging pest of soybean in the United States, soybean cyst nematode (SCN; Heterodera glycines Ichinohe), by combining the novel genetic resistance of PI 567516C with the established resistance of ‘Hartwig’. Development of these lines was characterized by intensive selection of F3 plants based on agronomic characteristics and simple sequence repeat markers associated with SCN resistance quantitative trait loci (QTL) in PI 567516C and Hartwig. The new lines have inherited resistance alleles at five QTL: two originating from PI 567516C and three originating from Hartwig, across four chromosomes. The lines were evaluated for and exhibit varying levels of resistance to other economically important pathogens of soybean, including: reniform nematode (Rotylenchulus reniformis Linford & Oliveira), frogeye leaf spot (caused by Cercospora sojina Hara), and southern stem canker (caused by Diaporthe phaseolorum var. meridionalis F. A. Fernández). JTN‐5316, JTN‐5416, and JTN‐5516 were field tested for multiple years in Jackson and Milan, TN, and produce moderate seed yield. These determinate maturity group (MG) V germplasm lines are excellent parent material for breeding programs with an interest in incorporating broad genetic resistance to SCN.