QTL mapping including codominant SNP markers with ploidy level information in a sugarcane progeny
| Autor: | Antonio Augusto Franco Garcia, F. R. C. Santos, Rodrigo Gazaffi, M. A. Xavier, Melina Cristina Mancini, Anete Pereira de Souza, Maria Marta Pastina, Dilermando Perecin, Luciana Rossini Pinto, Marcelo Mollinari, Estela Araujo Costa, Carina de Oliveira Anoni, Thiago G. Marconi |
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| Rok vydání: | 2016 |
| Předmět: |
0106 biological sciences
0301 basic medicine Linkage (software) Genetics Brix food and beverages Plant Science Horticulture Biology Quantitative trait locus biology.organism_classification 01 natural sciences Genome Saccharum 03 medical and health sciences 030104 developmental biology Genetic linkage Amplified fragment length polymorphism Ploidy Agronomy and Crop Science 010606 plant biology & botany |
| Zdroj: | Euphytica. 211:1-16 |
| ISSN: | 1573-5060 0014-2336 |
| Popis: | Quantitative trait locus (QTL) mapping contributes to sugarcane (Saccharum spp.) breeding programs by providing information about the genetic effects, positioning and number of QTLs. Combined with marker-assisted selection, it can help breeders reduce the time required to develop new sugarcane varieties. We performed a QTL mapping study for important agronomic traits in sugarcane using the composite interval mapping method for outcrossed species. A new approach allowing the 1:2:1 segregation ratio and different ploidy levels for SNP markers was used to construct an integrated genetic linkage map that also includes AFLP and SSR markers. Were used 688 molecular markers with 1:1, 3:1 and 1:2:1 segregation ratios. A total of 187 individuals from a bi-parental cross (IACSP95-3018 and IACSP93-3046) were assayed across multiple harvests from two locations. The evaluated yield components included stalk diameter (SD), stalk weight (SW), stalk height (SH), fiber percentage (Fiber), sucrose content (Pol) and soluble solid content (Brix). The genetic linkage map covered 4512.6 cM and had 118 linkage groups corresponding to 16 putative homology groups. A total of 25 QTL were detected for SD (six QTL), SW (five QTL), SH (four QTL), Fiber (five QTL), Pol (two QTL) and Brix (three QTL). The percentage of phenotypic variation explained by each QTL ranged from 0.069 to 3.87 %, with a low individual effect because of the high ploidy level. The mapping model provided estimates of the segregation ratio of each mapped QTL (1:2:1, 3:1 or 1:1). Our results provide information about the genetic organization of the sugarcane genome and constitute the first step toward a better dissection of complex traits. |
| Databáze: | OpenAIRE |
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