We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
QTL mapping for yield components in a tropical maize population using microsatellite markers.
- Authors
Karen Sabadin, Priscilla; Lopes de Souza Júnior, Cláudio; Pereira de Souza, Anete; Augusto Franco Garcia, Antonio
- Abstract
QTL mapping provides usefull information for breeding programs since it allows the estimation of genomic locations and genetic effects of chromossomal regions related to the expression of quantitative traits. The objective of this study was to map QTL related to several agronomic important traits associated with grain yield: ear weight (EW), prolificacy (PROL), ear number (NE), ear length (EL) and diameter (ED), number of rows on the ear (NRE) and number of kernels per row on the ear (NKPR). Four hundred F2:3 tropical maize progenies were evaluated in five environments in Piracicaba, Sao Paulo, Brazil. The genetic map was previously estimated and had 117 microssatelite loci with average distance of 14 cM. Data was analysed using Composite Interval Mapping for each trait. Thirty six QTL were mapped and related to the expression of EW (2), PROL (3), NE (2), EL (5), ED (5), NRE (10), NKPR (5). Few QTL were mapped since there was high G×E interaction. Traits EW, PROL and EN showed high genetic correlation with grain yield and several QTL mapped to similar genomic regions, which could cause the observed correlation. However, further analysis using apropriate statistical models are required to separate linked versus pleiotropic QTL. Five QTL (named Ew1, Ne1, Ed3, Nre3 and Nre10) had high genetic effects, explaining from 10.8% ( Nre3) to 16.9% ( Nre10) of the phenotypic variance, and could be considered in further studies.
- Subjects
CORN genetics; MICROSATELLITE repeats; PLANT gene mapping; PLANT molecular genetics; PLANT breeding; PLANT chromosomes
- Publication
Hereditas, 2008, Vol 145, Issue 4, p194
- ISSN
0018-0661
- Publication type
Article
- DOI
10.1111/j.0018-0661.2008.02065.x