Abstract
Soybean rust, Phakopsora pachyrhizi, is one of the most serious and widespread foliar diseases of soybean causing high yield losses world-wide. The objective of this study was to identify and map quantitative trait loci (QTLs) resistant to soybean rust in genotype UG 5. Ninety-seven F2 mapping plants, obtained from a cross between Wondersoya and UG 5, were used for this study. Quantitative trait locus analysis using QTL IciMapping software identified three putative QTLs associated with soybean rust (SBR) on chromosomes 6, 9 and 18 with logarithms of odds (LOD) scores ranging from 3.47 to 8.23 and phenotypic variance explained by the QTLs ranging from 18.3 to 25.6%. The putative QTL detected on chromosome 9 is novel and has not been reported elsewhere. The putative QTLs identified in this study could help to facilitate SBR resistance breeding towards efficient marker-assisted selection approach and gene pyramiding leading to the development of durable resistance. Key words: Linkage map, segregation, simple sequence repeat (SSR).
Highlights
Soybean (Glycine max [L.] Merrill) is one of the most important legume crops in the world providing a major source of high-quality protein and oil for human consumption and livestock feeds
The F2 plants with Reddish brown (RB) lesions had a mean disease severity score of 2.3 ranging from 1.3 to 2.8, while those with TAN lesions had a higher mean severity score of 4.0 ranging from 2.9 to 5.0
The F2 mapping population showed segregation of 69 plants with resistant phenotype and 28 plants with susceptible phenotype based on disease severity score
Summary
Soybean (Glycine max [L.] Merrill) is one of the most important legume crops in the world providing a major source of high-quality protein and oil for human consumption and livestock feeds. Soybean rust (SBR), caused by Phakopsora pachyrhizi, is the most severe destructive foliar disease leading to high loss in yield and quality of soybean. Soybean rust was first reported in 1902 in Japan (Hennings, 1903) and subsequently spread from Asia to Africa, South America (Yorinori et al, 2005) and the United States of America (Schneider et al, 2005) through air-borne movement of urediniospores. Considering the explosive nature of the disease and the high potential yield losses (up to 80%), soybean rust has long been viewed as a serious threat to soybean production worldwide. The development of resistant varieties to soybean rust could reduce the impact of the disease without the expensive, timeconsuming and negative environmental impact of foliar fungicide applications
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
