| Full text | |
| Author(s): Show less - |
Costa, E. A.
;
Anoni, C. O.
;
Mancini, M. C.
;
Santos, F. R. C.
;
Marconi, T. G.
;
Gazaffi, R.
;
Pastina, M. M.
;
Perecin, D.
;
Mollinari, M.
;
Xavier, M. A.
;
Pinto, L. R.
;
Souza, A. P.
;
Garcia, A. A. F.
Total Authors: 13
|
| Document type: | Review article |
| Source: | EUPHYTICA; v. 211, n. 1, p. 1-16, SEP 2016. |
| Web of Science Citations: | 7 |
| Abstract | |
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. (AU) | |
| FAPESP's process: | 10/06715-3 - Multiple Imputation for QTL mapping in outcrossing species, with applications in sugarcane |
| Grantee: | Carina de Oliveira Anoni |
| Support Opportunities: | Scholarships in Brazil - Master |
| FAPESP's process: | 05/55258-6 - Genetic mapping and identification of genetic and functional molecular markers associated with agronomic characteristics of interest in sugarcane |
| Grantee: | Luciana Rossini Pinto Machado da Silva |
| Support Opportunities: | Research Grants - Young Investigators Grants |
| FAPESP's process: | 08/52197-4 - Genomic-assisted breeding of sugarcane: using molecular markers for understanding the genetic architecture of quantitative traits and to implement marker assisted selection |
| Grantee: | Anete Pereira de Souza |
| Support Opportunities: | Program for Research on Bioenergy (BIOEN) - Thematic Grants |
| FAPESP's process: | 08/57908-6 - National Institute of Science and Technology of Bioethanol |
| Grantee: | Marcos Silveira Buckeridge |
| Support Opportunities: | Program for Research on Bioenergy (BIOEN) - Thematic Grants |