Mapping of QTLs associated with biological nitrogen fixation traits in soybean. (13th June 2013)

• Record Type: Journal Article
• Authors: Santos, Maria Aparecida; Geraldi, Isaias Olívio; Garcia, Antonio Augusto Franco; Bortolatto, Nágila; Schiavon, Aline; Hungria, Mariangela
• Is Part Of: Hereditas. Volume 150:Number 2/3(2013)
• Page Start: 17
• Page End: 25
• Publication Date: 2013-06-13
• Subjects: Heredity -- Periodicals; Genetics -- Periodicals; Cytogénétique; Génétique; Hérédité; Périodique électronique (Descripteur de forme); Ressource Internet (Descripteur de forme); 576.5
• DOI: 10.1111/j.1601-5223.2013.02275.x
• Languages: English
• ISSNs: 0018-0661

Abstract

Abstract : Biological nitrogen fixation (BNF) is a key process, but despite the economic and environmental importance, few studies about quantitative trait loci (QTL) controlling BNF traits are available, even in the economically important crop soybean Glycine max (L.) Merr. In this study, a population of 157 F2:7 RILs derived from crossing soybean cultivars Bossier (high BNF capacity) and Embrapa 20 (medium BNF capacity) was genotyped with 105 simple sequence repeat markers (SSRs). The genetic map obtained has 1231.2 cM and covers about 50% of the genome, with an average interval of 18.1 cM. Three traits, nodule number (NN), the ratio nodule dry weight (NDW)/NN and shoot dry weight (SDW) were used to evaluate BNF performance. A composite interval mapping for multiple traits method (mCIM) analysis mapped two QTLs for SDW (LGs E and L), three for NN (LGs B1, E and I), and one for NDW/NN (LG I); all QTLs were of small effect (R‐values ranging from 1.7% to 10.0%) and explained 15.4%, 13.8% and 6.5% of total variation for these three traits, respectively.