title: Phenotypic variation and identification of quantitative trait loci for ozone tolerance in a Fiskeby III × Mandarin (Ottawa) soybean population.
abstract: Soybean quantitative trait loci for ozone response. Ground-level ozone reduces yield in crops such as soybean (Glycine max (L.) Merr.). Phenotypic variation has been observed for this trait in multiple species; however, breeding for ozone tolerance has been limited. A recombinant inbred population was developed from soybean genotypes differing in tolerance to ozone: tolerant Fiskeby III and sensitive Mandarin (Ottawa). Plants were exposed to ozone treatment for 5 days in greenhouse chambers followed by visual scoring for foliar injury. Mean injury score in the mid-canopy was 16 % for Fiskeby III, and 81 % for Mandarin (Ottawa). Injury scores were lower in younger leaves for both parents and progeny, compared to scores in the older leaves. Segregation was consistent with multigenic inheritance. Correlation coefficients for injury between leaf positions ranged from 0.34 to 0.81, with the closer leaf positions showing the greater correlation. Narrow sense heritability within an ozone treatment chamber was 0.59, 0.40, 0.29, 0.30, 0.19, and 0.35 for the 2nd, 3rd, 4th, 5th, 6th, and combined 3rd-5th main stem leaf positions (numbered acropetally), respectively, based on genotypic means over three independent replications. Quantitative trait loci (QTL) analysis showed that loci were associated with distinct leaf developmental stages. QTL were identified on Chromosome 17 for the 2nd and 3rd leaf positions, and on Chromosome 4 for the 5th and 6th leaf positions. Additional loci were identified on Chromosomes 6, 18, 19, and 20. Interacting loci were identified on Chromosomes 5 and 15 for injury on trifoliate 4. The ozone sensitive parent contributed one favorable allele for ozone response.
authors.affiliation: Plant Science Research Unit, USDA-ARS, 3127 Ligon Street, Raleigh, NC, 27607, USA.
authors.forename: Amy L
authors.initials: AL
authors.lastname: Burton
authors.affiliation: Plant Science Research Unit, USDA-ARS, 3127 Ligon Street, Raleigh, NC, 27607, USA. Kent.Burkey@ars.usda.gov.|Department of Crop Science, North Carolina State University, Raleigh, NC, 27695-7631, USA. Kent.Burkey@ars.usda.gov.
authors.forename: Kent O
authors.initials: KO
authors.lastname: Burkey
authors.affiliation: Soybean and Nitrogen Fixation Unit, USDA-ARS, 3127 Ligon Street, Raleigh, NC, 27607, USA.|Department of Crop Science, North Carolina State University, Raleigh, NC, 27695-7631, USA.
authors.forename: Thomas E
authors.initials: TE
authors.lastname: Carter
authors.affiliation: Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul, MN, 55108-6026, USA.
authors.forename: James
authors.initials: J
authors.lastname: Orf
authors.affiliation: Soybean Genomics and Improvement Lab, USDA-ARS, 10300 Baltimore Avenue, Bldg. 006, BARC-West, Beltsville, MD, 20705, USA.
authors.forename: Perry B
authors.initials: PB
authors.lastname: Cregan
mesh_terms: D000483:Alleles; D002874:Chromosome Mapping; D005838:Genotype; D010126:Ozone / Q000009:adverse effects*; D010641:Phenotype; D018515:Plant Leaves / Q000502:physiology; D040641:Quantitative Trait Loci; D013025:Glycine max / Q000235:genetics* / Q000502:physiology
chemical_list: D010126:Ozone